Pub Date : 2024-02-09DOI: 10.1177/02670844241231692
Yaojun Chen, Hao Fu, Yipu Sun, Wei Bing
The corrosion caused by marine organisms adhering to the wall surface is one of the main reasons for the failure of ships and equipment, and leads to shortened life and increased maintenance costs, and this has seriously affected the development of the national economy. Therefore, it is very important to develop a new composite material to protect the metal substrate from biological corrosion. In this article, a superhydrophobic surface was prepared by simply spraying silicone rubber emulsion containing hydrophobic SiO2 nanoparticles onto a graphene silicone rubber (GSR) pre-coated substrate (SiO2-GSR). The antifouling ability was investigated under laboratory conditions and real marine environments, and the results show that the SiO2-GSR coating has good antiadhesion effect and longer antifouling ability. The anticorrosion performance was evaluated by electrochemistry methods, and the SiO2-GSR has good corrosion resistance ability. Additionally, the SiO2-GSR film still exhibited a strong antifouling and anticorrosion ability after immersed in marine environment for 6 months. Therefore, SiO2-GSR can be applied to the maritime field as an effective antifouling and anticorrosion coating.
{"title":"Study on the superhydrophobic coatings with antifouling and anticorrosion properties","authors":"Yaojun Chen, Hao Fu, Yipu Sun, Wei Bing","doi":"10.1177/02670844241231692","DOIUrl":"https://doi.org/10.1177/02670844241231692","url":null,"abstract":"The corrosion caused by marine organisms adhering to the wall surface is one of the main reasons for the failure of ships and equipment, and leads to shortened life and increased maintenance costs, and this has seriously affected the development of the national economy. Therefore, it is very important to develop a new composite material to protect the metal substrate from biological corrosion. In this article, a superhydrophobic surface was prepared by simply spraying silicone rubber emulsion containing hydrophobic SiO2 nanoparticles onto a graphene silicone rubber (GSR) pre-coated substrate (SiO2-GSR). The antifouling ability was investigated under laboratory conditions and real marine environments, and the results show that the SiO2-GSR coating has good antiadhesion effect and longer antifouling ability. The anticorrosion performance was evaluated by electrochemistry methods, and the SiO2-GSR has good corrosion resistance ability. Additionally, the SiO2-GSR film still exhibited a strong antifouling and anticorrosion ability after immersed in marine environment for 6 months. Therefore, SiO2-GSR can be applied to the maritime field as an effective antifouling and anticorrosion coating.","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139788222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.1177/02670844241229043
Tao Sun, Jiajun Zang, Zhihui Yang, Yifu Shen
In this work, Cu-diamond/Cu-diamond-Cu2NiAlAgZn bi-layer coatings were prepared via mechanical alloying on copper substrate, in which Cu-diamond was the inner layer and Cu-diamond-Cu2NiAlAgZn was the outer layer. The results revealed that the quinary alloy Cu2NiAlAgZn HEAs has simple FCC solid solution structure and the interface of bi-layer coating is identifiable. The inner gray area consisted of a Cu-diamond composite, while the outer gray area was a Cu2NiAlAgZn HEAs reinforced Cu matrix composite. However, there were some defects in the microstructure and the compactness was not satisfactory. Therefore, recrystallization annealing treatment was performed on the bi-layer coatings. The microhardness distribution from the substrate to the coating showed the characteristics of ‘increase-drop-increase’ before and after heat treatment. Although the microhardness slightly decreased, heat treatment resulted in a denser coating and eliminated defects. Moreover, the thermal and electrical conductivity of the sample that have undergone heat treatment significantly increased.
{"title":"Investigation of Cu-diamond/Cu-diamond-high-entropy alloys bi-layer coating via mechanical alloying","authors":"Tao Sun, Jiajun Zang, Zhihui Yang, Yifu Shen","doi":"10.1177/02670844241229043","DOIUrl":"https://doi.org/10.1177/02670844241229043","url":null,"abstract":"In this work, Cu-diamond/Cu-diamond-Cu2NiAlAgZn bi-layer coatings were prepared via mechanical alloying on copper substrate, in which Cu-diamond was the inner layer and Cu-diamond-Cu2NiAlAgZn was the outer layer. The results revealed that the quinary alloy Cu2NiAlAgZn HEAs has simple FCC solid solution structure and the interface of bi-layer coating is identifiable. The inner gray area consisted of a Cu-diamond composite, while the outer gray area was a Cu2NiAlAgZn HEAs reinforced Cu matrix composite. However, there were some defects in the microstructure and the compactness was not satisfactory. Therefore, recrystallization annealing treatment was performed on the bi-layer coatings. The microhardness distribution from the substrate to the coating showed the characteristics of ‘increase-drop-increase’ before and after heat treatment. Although the microhardness slightly decreased, heat treatment resulted in a denser coating and eliminated defects. Moreover, the thermal and electrical conductivity of the sample that have undergone heat treatment significantly increased.","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139792405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.1177/02670844241229043
Tao Sun, Jiajun Zang, Zhihui Yang, Yifu Shen
In this work, Cu-diamond/Cu-diamond-Cu2NiAlAgZn bi-layer coatings were prepared via mechanical alloying on copper substrate, in which Cu-diamond was the inner layer and Cu-diamond-Cu2NiAlAgZn was the outer layer. The results revealed that the quinary alloy Cu2NiAlAgZn HEAs has simple FCC solid solution structure and the interface of bi-layer coating is identifiable. The inner gray area consisted of a Cu-diamond composite, while the outer gray area was a Cu2NiAlAgZn HEAs reinforced Cu matrix composite. However, there were some defects in the microstructure and the compactness was not satisfactory. Therefore, recrystallization annealing treatment was performed on the bi-layer coatings. The microhardness distribution from the substrate to the coating showed the characteristics of ‘increase-drop-increase’ before and after heat treatment. Although the microhardness slightly decreased, heat treatment resulted in a denser coating and eliminated defects. Moreover, the thermal and electrical conductivity of the sample that have undergone heat treatment significantly increased.
{"title":"Investigation of Cu-diamond/Cu-diamond-high-entropy alloys bi-layer coating via mechanical alloying","authors":"Tao Sun, Jiajun Zang, Zhihui Yang, Yifu Shen","doi":"10.1177/02670844241229043","DOIUrl":"https://doi.org/10.1177/02670844241229043","url":null,"abstract":"In this work, Cu-diamond/Cu-diamond-Cu2NiAlAgZn bi-layer coatings were prepared via mechanical alloying on copper substrate, in which Cu-diamond was the inner layer and Cu-diamond-Cu2NiAlAgZn was the outer layer. The results revealed that the quinary alloy Cu2NiAlAgZn HEAs has simple FCC solid solution structure and the interface of bi-layer coating is identifiable. The inner gray area consisted of a Cu-diamond composite, while the outer gray area was a Cu2NiAlAgZn HEAs reinforced Cu matrix composite. However, there were some defects in the microstructure and the compactness was not satisfactory. Therefore, recrystallization annealing treatment was performed on the bi-layer coatings. The microhardness distribution from the substrate to the coating showed the characteristics of ‘increase-drop-increase’ before and after heat treatment. Although the microhardness slightly decreased, heat treatment resulted in a denser coating and eliminated defects. Moreover, the thermal and electrical conductivity of the sample that have undergone heat treatment significantly increased.","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139852229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-07DOI: 10.1177/02670844241231199
Xinjie Lu, Zongde Liu, Chaoyang Pan, Jie Mao
Stellite alloys are a kind of cobalt-based alloys, which have excellent properties and are widely used in numerous areas. However, the wear resistance of Stellite alloys is poor at room temperature. In this study, Stellite31 cladding layers added with 0%, 1%, 2% and 3% of Mo(wt-%) were prepared by laser cladding. The grain sizes were measured by scanning electron microscope images, the distributions of Mo were analysed by energy dispersive X-ray spectrometry, the physical phase compositions were analysed by X-ray diffractometer, and the wear resistance was evaluated by reciprocating friction wear tester and wet sand wear testing machine. The results showed that the grain sizes of the cladding layers decreased with the increase of Mo content, the wear loss of the cladding layers became lower and the friction coefficient decreased under the same test conditions. It was concluded that increasing the Mo content could improve the wear resistance of the Stellite31 cladding layer at room temperature.
Stellite 合金是一种钴基合金，具有优异的性能，被广泛应用于许多领域。然而，Stellite 合金在室温下的耐磨性较差。本研究采用激光熔覆法制备了添加 0%、1%、2% 和 3% Mo（wt-%）的 Stellite31 堆焊层。用扫描电子显微镜图像测量了晶粒尺寸，用能量色散 X 射线光谱分析了钼的分布，用 X 射线衍射仪分析了物相组成，并用往复摩擦磨损试验机和湿砂磨损试验机评估了耐磨性。结果表明，在相同的试验条件下，随着 Mo 含量的增加，堆焊层的晶粒尺寸减小，堆焊层的磨损损耗降低，摩擦系数减小。由此得出结论，增加 Mo 含量可提高 Stellite31 堆焊层在室温下的耐磨性。
{"title":"Effect of Mo on wear resistance of Stellite31 cladding layer","authors":"Xinjie Lu, Zongde Liu, Chaoyang Pan, Jie Mao","doi":"10.1177/02670844241231199","DOIUrl":"https://doi.org/10.1177/02670844241231199","url":null,"abstract":"Stellite alloys are a kind of cobalt-based alloys, which have excellent properties and are widely used in numerous areas. However, the wear resistance of Stellite alloys is poor at room temperature. In this study, Stellite31 cladding layers added with 0%, 1%, 2% and 3% of Mo(wt-%) were prepared by laser cladding. The grain sizes were measured by scanning electron microscope images, the distributions of Mo were analysed by energy dispersive X-ray spectrometry, the physical phase compositions were analysed by X-ray diffractometer, and the wear resistance was evaluated by reciprocating friction wear tester and wet sand wear testing machine. The results showed that the grain sizes of the cladding layers decreased with the increase of Mo content, the wear loss of the cladding layers became lower and the friction coefficient decreased under the same test conditions. It was concluded that increasing the Mo content could improve the wear resistance of the Stellite31 cladding layer at room temperature.","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139855965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-07DOI: 10.1177/02670844241231199
Xinjie Lu, Zongde Liu, Chaoyang Pan, Jie Mao
Stellite alloys are a kind of cobalt-based alloys, which have excellent properties and are widely used in numerous areas. However, the wear resistance of Stellite alloys is poor at room temperature. In this study, Stellite31 cladding layers added with 0%, 1%, 2% and 3% of Mo(wt-%) were prepared by laser cladding. The grain sizes were measured by scanning electron microscope images, the distributions of Mo were analysed by energy dispersive X-ray spectrometry, the physical phase compositions were analysed by X-ray diffractometer, and the wear resistance was evaluated by reciprocating friction wear tester and wet sand wear testing machine. The results showed that the grain sizes of the cladding layers decreased with the increase of Mo content, the wear loss of the cladding layers became lower and the friction coefficient decreased under the same test conditions. It was concluded that increasing the Mo content could improve the wear resistance of the Stellite31 cladding layer at room temperature.
Stellite 合金是一种钴基合金，具有优异的性能，被广泛应用于许多领域。然而，Stellite 合金在室温下的耐磨性较差。本研究采用激光熔覆法制备了添加 0%、1%、2% 和 3% Mo（wt-%）的 Stellite31 堆焊层。用扫描电子显微镜图像测量了晶粒尺寸，用能量色散 X 射线光谱分析了钼的分布，用 X 射线衍射仪分析了物相组成，并用往复摩擦磨损试验机和湿砂磨损试验机评估了耐磨性。结果表明，在相同的试验条件下，随着 Mo 含量的增加，堆焊层的晶粒尺寸减小，堆焊层的磨损损耗降低，摩擦系数减小。由此得出结论，增加 Mo 含量可提高 Stellite31 堆焊层在室温下的耐磨性。
{"title":"Effect of Mo on wear resistance of Stellite31 cladding layer","authors":"Xinjie Lu, Zongde Liu, Chaoyang Pan, Jie Mao","doi":"10.1177/02670844241231199","DOIUrl":"https://doi.org/10.1177/02670844241231199","url":null,"abstract":"Stellite alloys are a kind of cobalt-based alloys, which have excellent properties and are widely used in numerous areas. However, the wear resistance of Stellite alloys is poor at room temperature. In this study, Stellite31 cladding layers added with 0%, 1%, 2% and 3% of Mo(wt-%) were prepared by laser cladding. The grain sizes were measured by scanning electron microscope images, the distributions of Mo were analysed by energy dispersive X-ray spectrometry, the physical phase compositions were analysed by X-ray diffractometer, and the wear resistance was evaluated by reciprocating friction wear tester and wet sand wear testing machine. The results showed that the grain sizes of the cladding layers decreased with the increase of Mo content, the wear loss of the cladding layers became lower and the friction coefficient decreased under the same test conditions. It was concluded that increasing the Mo content could improve the wear resistance of the Stellite31 cladding layer at room temperature.","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139795994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.1177/02670844231218221
Muhammet Cakir, Hikmet Çiçek, Semih Duran, Ahmet Melik Yilmaz, Gokhan Gulten, I. Efeoglu
Ti2AlN MAX phase films produced at different N2 flow rates and different annealing temperatures were deposited on 52100 steel substrates using the closed-field unbalanced magnetron sputtering technique. N2 flow rates were changed to 2, 3.5, and 5 sccm. Due to the increasing N2 flow rate, film thickness decreased from 2 to 1.3 µm. Then the produced films were subjected to annealing at temperatures of 700, 750, and 800°C. After the film produced at a flow rate of 2 sccm was annealed at 750°C, the presence of the Ti2AlN MAX phase was determined. The binding energies of Ti 2p, Al 2p, and N 1s determined in the XPS analysis confirmed the existence of the Ti2AlN film. The friction coefficient measured for Ti2AlN MAX phase films was calculated as 0.53, the hardness value as 22.8 GPa, the elastic modulus as 291.4 GPa, and the wear rate as 2.96 × 10−4 mm3/(N·m).
{"title":"The effect of different annealing temperatures on the mechanical and tribological properties of the Ti2AlN MAX phase films","authors":"Muhammet Cakir, Hikmet Çiçek, Semih Duran, Ahmet Melik Yilmaz, Gokhan Gulten, I. Efeoglu","doi":"10.1177/02670844231218221","DOIUrl":"https://doi.org/10.1177/02670844231218221","url":null,"abstract":"Ti2AlN MAX phase films produced at different N2 flow rates and different annealing temperatures were deposited on 52100 steel substrates using the closed-field unbalanced magnetron sputtering technique. N2 flow rates were changed to 2, 3.5, and 5 sccm. Due to the increasing N2 flow rate, film thickness decreased from 2 to 1.3 µm. Then the produced films were subjected to annealing at temperatures of 700, 750, and 800°C. After the film produced at a flow rate of 2 sccm was annealed at 750°C, the presence of the Ti2AlN MAX phase was determined. The binding energies of Ti 2p, Al 2p, and N 1s determined in the XPS analysis confirmed the existence of the Ti2AlN film. The friction coefficient measured for Ti2AlN MAX phase films was calculated as 0.53, the hardness value as 22.8 GPa, the elastic modulus as 291.4 GPa, and the wear rate as 2.96 × 10−4 mm3/(N·m).","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140477819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.1177/02670844231216903
Xianlong Shen, Yongjun Zhang
In this study, AZ91 magnesium alloy was effectively coated with a superhydrophobic Ni–B/graphene oxide (GO) coating via electroless plating and surface modification. Scanning electron microscopy, energy dispersion spectrum, X-ray powder diffraction, and X-ray photoelectron spectroscopy analysis were employed to describe the development of Ni–B/GO coatings. The results show that the micro–nano rough structures of the superhydrophobic coating were owing to the synergistic action of GO and sodium dodecyl sulphate and their respective effects on the coating. It was also found that the nanoscale GO particle wrapped around the underdeveloped nickel grains. Also, the composition and structure of the typical superhydrophobic coating cross-section revealed the growth of the rough structures. Furthermore, the superhydrophobic coating with a water contact angle of up to 161.6° had an amorphous structure. The micro–nano coating therefore provides a novel viewpoint for preparing superhydrophobic coating on magnesium alloy.
本研究通过无电解电镀和表面改性，有效地在 AZ91 镁合金上镀上了超疏水的 Ni-B/ 氧化石墨烯（GO）涂层。采用扫描电子显微镜、能量色散谱、X 射线粉末衍射和 X 射线光电子能谱分析来描述 Ni-B/GO 涂层的发展过程。结果表明，超疏水涂层的微纳米粗糙结构是由于 GO 和十二烷基硫酸钠的协同作用及其各自对涂层的影响。研究还发现，纳米级的 GO 粒子包裹着未充分发育的镍晶粒。同时，典型的超疏水涂层横截面的组成和结构显示了粗糙结构的生长。此外，水接触角高达 161.6° 的超疏水涂层具有无定形结构。因此，微纳米涂层为制备镁合金超疏水涂层提供了一个新的视角。
{"title":"A new approach for constructing rough structures to fabricate superhydrophobic Ni–B/graphene oxide (GO) coating","authors":"Xianlong Shen, Yongjun Zhang","doi":"10.1177/02670844231216903","DOIUrl":"https://doi.org/10.1177/02670844231216903","url":null,"abstract":"In this study, AZ91 magnesium alloy was effectively coated with a superhydrophobic Ni–B/graphene oxide (GO) coating via electroless plating and surface modification. Scanning electron microscopy, energy dispersion spectrum, X-ray powder diffraction, and X-ray photoelectron spectroscopy analysis were employed to describe the development of Ni–B/GO coatings. The results show that the micro–nano rough structures of the superhydrophobic coating were owing to the synergistic action of GO and sodium dodecyl sulphate and their respective effects on the coating. It was also found that the nanoscale GO particle wrapped around the underdeveloped nickel grains. Also, the composition and structure of the typical superhydrophobic coating cross-section revealed the growth of the rough structures. Furthermore, the superhydrophobic coating with a water contact angle of up to 161.6° had an amorphous structure. The micro–nano coating therefore provides a novel viewpoint for preparing superhydrophobic coating on magnesium alloy.","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140474754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-31DOI: 10.1177/02670844231217407
Dongzhen Xiao, Fulin Jiang, Pengfang Song, Tao Song
Marine engineering components, such as ship stern shafts, are often subject to local overload, wear and seawater erosion. In order to improve the performance and service life of marine engineering components, the CrFeCoNiNb x ( x = 0, 0.25, 0.5, 0.75 and 1) high-entropy alloy (HEA) coating were prepared on the 42CrMo substrate by laser cladding. The microstructure, microhardness, wear behaviour and the corrosion resistance of the prepared HEA coatings with different Nb contents were evaluated. Results show that the cladding layer of CrFeCoNiNb0 is composed of single dendrites with a small amount of short rod-shaped protrusions distributed along the dendrites. The addition of Nb promotes growing of the original dendrite structures into interdendritic structures with internal substructures retained. Apart from the variations in the microstructure, the formation of the Laves phase, which is both hard and corrosion resistant, is also an important factor in the performance of the cladding. This variation leads to the increase of the microhardness of the cladding layer, accompanying with the improvement of wear resistance property. Notably, the improvement of microhardness is ascribed to the combined contribution from the refinement strengthening, the solid-solution strengthening and the dispersion strengthening by Laves phase. The improvement of the corrosion resistance is mainly attributed to dense passivation film formed by the Cr and Nb on the surface of the cladding layer. The above results suggest that the CrFeCoNiNb x cladding layer could achieve synergistic interaction between the mechanical properties and the corrosion resistance on stern shaft surface.
船舶艉轴等海洋工程部件经常受到局部过载、磨损和海水侵蚀的影响。为了提高海洋工程部件的性能和使用寿命，采用激光熔覆方法在 42CrMo 基体上制备了 CrFeCoNiNb x（x = 0、0.25、0.5、0.75 和 1）高熵合金（HEA）涂层。对所制备的不同铌含量的 HEA 涂层的显微结构、显微硬度、磨损性能和耐腐蚀性能进行了评估。结果表明，CrFeCoNiNb0 的熔覆层由单个树枝状突起组成，沿树枝状突起分布有少量短杆状突起。铌的加入促进了原始枝晶结构向枝晶间结构的生长，同时保留了内部的亚结构。除了微观结构的变化外，硬度和耐腐蚀性都很高的 Laves 相的形成也是影响包层性能的一个重要因素。这种变化导致堆焊层的显微硬度增加，同时提高了耐磨性能。值得注意的是，显微硬度的提高是由于细化强化、固溶强化和 Laves 相的分散强化共同作用的结果。耐腐蚀性能的改善主要归功于铬和铌在覆层表面形成的致密钝化膜。上述结果表明，CrFeCoNiNb x 堆焊层可实现艉轴表面机械性能和耐腐蚀性能的协同作用。
{"title":"Effect of the Nb content on the microstructure evolution and properties of the CrFeCoNiNbx layers prepared by laser cladding","authors":"Dongzhen Xiao, Fulin Jiang, Pengfang Song, Tao Song","doi":"10.1177/02670844231217407","DOIUrl":"https://doi.org/10.1177/02670844231217407","url":null,"abstract":"Marine engineering components, such as ship stern shafts, are often subject to local overload, wear and seawater erosion. In order to improve the performance and service life of marine engineering components, the CrFeCoNiNb x ( x = 0, 0.25, 0.5, 0.75 and 1) high-entropy alloy (HEA) coating were prepared on the 42CrMo substrate by laser cladding. The microstructure, microhardness, wear behaviour and the corrosion resistance of the prepared HEA coatings with different Nb contents were evaluated. Results show that the cladding layer of CrFeCoNiNb0 is composed of single dendrites with a small amount of short rod-shaped protrusions distributed along the dendrites. The addition of Nb promotes growing of the original dendrite structures into interdendritic structures with internal substructures retained. Apart from the variations in the microstructure, the formation of the Laves phase, which is both hard and corrosion resistant, is also an important factor in the performance of the cladding. This variation leads to the increase of the microhardness of the cladding layer, accompanying with the improvement of wear resistance property. Notably, the improvement of microhardness is ascribed to the combined contribution from the refinement strengthening, the solid-solution strengthening and the dispersion strengthening by Laves phase. The improvement of the corrosion resistance is mainly attributed to dense passivation film formed by the Cr and Nb on the surface of the cladding layer. The above results suggest that the CrFeCoNiNb x cladding layer could achieve synergistic interaction between the mechanical properties and the corrosion resistance on stern shaft surface.","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140471159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-18DOI: 10.1177/02670844231213598
Shanshan Lu, B. Jiang, Aoyun Fan, Renguo Song
AZ31 magnesium alloy with different annealing temperatures was subjected to micro-arc oxidation (MAO) treatment, and its corrosion behaviour was studied using immersion experiments, polarisation curves, electrochemical impedance spectra, scanning electron microscopy (SEM) and X-ray diffraction (XRD) spectra. The alloy, when annealed at 300 °C, had the smallest grain size and the lowest electrical conductivity. Compared to other annealed alloys, the MAO coating had the smallest pore size and porosity and better corrosion resistance. The corrosion resistance of the alloy increased initially and then decreased with the increase in annealing temperature. This is mainly because the grain size first decreases and then increases, leading to a decline in electrical conductivity and then a rise, resulting in changes in the microstructure of the coating surface.
对不同退火温度的 AZ31 镁合金进行了微弧氧化（MAO）处理，并使用浸泡实验、极化曲线、电化学阻抗光谱、扫描电子显微镜（SEM）和 X 射线衍射（XRD）光谱研究了其腐蚀行为。在 300 °C 退火时，该合金的晶粒尺寸最小，导电率最低。与其他退火合金相比，MAO 涂层的孔径和孔隙率最小，耐腐蚀性更好。随着退火温度的升高，合金的耐腐蚀性先是增强，然后减弱。这主要是因为晶粒尺寸先减小后增大，导致导电率先降后升，从而引起涂层表面微观结构的变化。
{"title":"Effect of annealing on AZ31 magnesium alloy on MAO coatings","authors":"Shanshan Lu, B. Jiang, Aoyun Fan, Renguo Song","doi":"10.1177/02670844231213598","DOIUrl":"https://doi.org/10.1177/02670844231213598","url":null,"abstract":"AZ31 magnesium alloy with different annealing temperatures was subjected to micro-arc oxidation (MAO) treatment, and its corrosion behaviour was studied using immersion experiments, polarisation curves, electrochemical impedance spectra, scanning electron microscopy (SEM) and X-ray diffraction (XRD) spectra. The alloy, when annealed at 300 °C, had the smallest grain size and the lowest electrical conductivity. Compared to other annealed alloys, the MAO coating had the smallest pore size and porosity and better corrosion resistance. The corrosion resistance of the alloy increased initially and then decreased with the increase in annealing temperature. This is mainly because the grain size first decreases and then increases, leading to a decline in electrical conductivity and then a rise, resulting in changes in the microstructure of the coating surface.","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139615043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-17DOI: 10.1177/02670844231214689
K. Vidyasagar, Dinesh Kalyanasundaram
Biomedical grade cobalt–chromium–molybdenum (CoCrMo) alloys are extensively used for load-bearing biomedical applications such as hip and knee implants due to their exceptional biocompatible and biomechanical properties. However, the strain-induced martensite ε-phase development during contact loading results in thin oxide layers that are prone to fracture leading to corrosion. The formation of thin oxide layers is undesirable for long-term deployment. We employed laser-texturing to enhance the corrosion resistance of the material in simulated body fluid by the formation of hcp ε-phase martensite and via the formation of oxide layers. However, partial formation of hcp ε-phase martensite was observed. By means of central composite design-based response surface methodology, three laser parameters such as average laser power, texture density and the number of passes were optimised for maximal open circuit potential, an indicator for minimal corrosion. The textured surfaces were found to assist in the cellular proliferation of fibroblasts and inhibit bacterial growth.
{"title":"Enhanced corrosion resistance of CoCrMo by laser-based surface modification","authors":"K. Vidyasagar, Dinesh Kalyanasundaram","doi":"10.1177/02670844231214689","DOIUrl":"https://doi.org/10.1177/02670844231214689","url":null,"abstract":"Biomedical grade cobalt–chromium–molybdenum (CoCrMo) alloys are extensively used for load-bearing biomedical applications such as hip and knee implants due to their exceptional biocompatible and biomechanical properties. However, the strain-induced martensite ε-phase development during contact loading results in thin oxide layers that are prone to fracture leading to corrosion. The formation of thin oxide layers is undesirable for long-term deployment. We employed laser-texturing to enhance the corrosion resistance of the material in simulated body fluid by the formation of hcp ε-phase martensite and via the formation of oxide layers. However, partial formation of hcp ε-phase martensite was observed. By means of central composite design-based response surface methodology, three laser parameters such as average laser power, texture density and the number of passes were optimised for maximal open circuit potential, an indicator for minimal corrosion. The textured surfaces were found to assist in the cellular proliferation of fibroblasts and inhibit bacterial growth.","PeriodicalId":21995,"journal":{"name":"Surface Engineering","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139616975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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