P. Guo, R. Bagheri, Lijing Yang, Zhenlun Song, Yaxuan Liu
Zinc (Zn) and its alloys, as novel biodegradable metals, hold great potential in bone implant and metallic stents. Stannum (Sn), an essential trace element, plays an important role in maintaining life activities. Herein, Sn is selected as an alloying element to be added into the Zn matrix to explore the possibility of Zn–Sn alloy as a biodegradable metal for clinical application. This article systemically studies the effects of Sn content on microstructural, electrochemical behavior, corrosion rate, and in vitro biocompatibility of Zn–Sn alloys. Results indicate that the Sn‐rich phase is the main form of Sn in the as‐extruded alloys, and the solid solubility is in an extremely minute quantity. The corrosion of Zn–Sn alloys in conventional simulated body fluid (c‐SBF) solution shows apparent electrochemical characteristics, and Sn‐rich phases are corroded preferably. The corrosion rates of Zn–1.0Sn and Zn–2.0Sn are under 0.2 mm year−1, which can satisfy the requirement of biodegradable medical materials. In addition, Zn–1.0Sn exhibits much better cytocompatibility and hemocompatibility than Zn–2.0Sn. Therefore, Zn–Sn alloy shows great potential applications in the biological field and can be further studied and developed.
{"title":"Effects of stannum (Sn) addition on corrosion behavior and biocompatibility in vitro of biodegradable Zn–Sn alloys","authors":"P. Guo, R. Bagheri, Lijing Yang, Zhenlun Song, Yaxuan Liu","doi":"10.1002/maco.202112722","DOIUrl":"https://doi.org/10.1002/maco.202112722","url":null,"abstract":"Zinc (Zn) and its alloys, as novel biodegradable metals, hold great potential in bone implant and metallic stents. Stannum (Sn), an essential trace element, plays an important role in maintaining life activities. Herein, Sn is selected as an alloying element to be added into the Zn matrix to explore the possibility of Zn–Sn alloy as a biodegradable metal for clinical application. This article systemically studies the effects of Sn content on microstructural, electrochemical behavior, corrosion rate, and in vitro biocompatibility of Zn–Sn alloys. Results indicate that the Sn‐rich phase is the main form of Sn in the as‐extruded alloys, and the solid solubility is in an extremely minute quantity. The corrosion of Zn–Sn alloys in conventional simulated body fluid (c‐SBF) solution shows apparent electrochemical characteristics, and Sn‐rich phases are corroded preferably. The corrosion rates of Zn–1.0Sn and Zn–2.0Sn are under 0.2 mm year−1, which can satisfy the requirement of biodegradable medical materials. In addition, Zn–1.0Sn exhibits much better cytocompatibility and hemocompatibility than Zn–2.0Sn. Therefore, Zn–Sn alloy shows great potential applications in the biological field and can be further studied and developed.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"43 1","pages":"231 - 241"},"PeriodicalIF":0.0,"publicationDate":"2021-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87863860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The influence of dislocation on corrosion of low alloy steel in a low H2S sour corrosion environment was investigated experimentally (immersion corrosion test and polarization measurement) and theoretically (ESM‐RISM simulation). The results showed that dislocation increases corrosion weight loss by promoting the anodic dissolution reaction. The Fe atom solubilities of two kinds of Fe slab models simulating conditions with/without lattice defects were evaluated, and the high Fe solubility of the model with lattice defects was clarified. Based on these experimental and theoretical findings, the mechanism by which dislocation influences anodic dissolution was discussed.
{"title":"Influence of dislocation on sour corrosion of carbon steel in a low H2S sour environment","authors":"I. Samusawa, D. Izumi, J. Shimamura","doi":"10.1002/maco.202112745","DOIUrl":"https://doi.org/10.1002/maco.202112745","url":null,"abstract":"The influence of dislocation on corrosion of low alloy steel in a low H2S sour corrosion environment was investigated experimentally (immersion corrosion test and polarization measurement) and theoretically (ESM‐RISM simulation). The results showed that dislocation increases corrosion weight loss by promoting the anodic dissolution reaction. The Fe atom solubilities of two kinds of Fe slab models simulating conditions with/without lattice defects were evaluated, and the high Fe solubility of the model with lattice defects was clarified. Based on these experimental and theoretical findings, the mechanism by which dislocation influences anodic dissolution was discussed.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"50 1","pages":"272 - 280"},"PeriodicalIF":0.0,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74833071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Tian, Yongqiang Pang, Zhizhong Jiang, L. Luo, Zunqi Xiao
Corrosion tests of T91 were carried out in the stagnant lead–bismuth eutectic (LBE) containing 10−6, 10−7, and 10−8 wt% oxygen at 500°C for up to 2000 h, respectively. The dependence of corrosion characteristics on oxygen concentrations in LBE was obtained. The results show that the oxide‐scale structure changes from a three‐layer magnetite/spinel/internal oxidation zone (IOZ) scale under the oxygen concentration of 10−6 wt%, to the formation of a two‐layer spinel/IOZ scale under the oxygen concentrations of 10−7 and 10−8 wt%. In addition, with the decrease of the oxygen concentration, the Cr/Fe ratio in the Fe–Cr spinel slightly increases in a linear rule while the thicknesses of the oxide layers gradually decrease.
{"title":"Corrosion characteristics of T91 steel in lead–bismuth eutectic with different oxygen concentrations at 500°C","authors":"S. Tian, Yongqiang Pang, Zhizhong Jiang, L. Luo, Zunqi Xiao","doi":"10.1002/maco.202112505","DOIUrl":"https://doi.org/10.1002/maco.202112505","url":null,"abstract":"Corrosion tests of T91 were carried out in the stagnant lead–bismuth eutectic (LBE) containing 10−6, 10−7, and 10−8 wt% oxygen at 500°C for up to 2000 h, respectively. The dependence of corrosion characteristics on oxygen concentrations in LBE was obtained. The results show that the oxide‐scale structure changes from a three‐layer magnetite/spinel/internal oxidation zone (IOZ) scale under the oxygen concentration of 10−6 wt%, to the formation of a two‐layer spinel/IOZ scale under the oxygen concentrations of 10−7 and 10−8 wt%. In addition, with the decrease of the oxygen concentration, the Cr/Fe ratio in the Fe–Cr spinel slightly increases in a linear rule while the thicknesses of the oxide layers gradually decrease.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"48 1","pages":"134 - 142"},"PeriodicalIF":0.0,"publicationDate":"2021-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90718073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xudong Chen, Xin Dai, H. Qian, Bin Yang, Jiqing Zhao
A newly developed technology, rotationally accelerated shot peening (RASP), was used to produce the nanocrystals on the surface of 316LN stainless steel. The effect of surface nanocrystallization on the oxide film properties of the steel in a high temperature and high‐pressure aqueous environment was studied. It was found that the outer layer of the oxide film consisted of NiFe2O4 with a loose spinel structure. The inner layer distributed tiny Cr2O3 particles compactly. The oxide films that grew on the RASP‐treated 316LN showed thicker and denser with higher corrosion resistance than on the as‐received steel. The nanostructures produced by RASP enhanced the formation of the superior oxide film. However, the deformation defects caused by RASP were harmful to the corrosion resistance. The results in this paper provide an easy way to enhance the corrosion resistance of the steel served in a high‐temperature aqueous environment.
{"title":"Effects of surface nanocrystallization on the oxide film formed on 316LN stainless steel in a high‐temperature aqueous environment","authors":"Xudong Chen, Xin Dai, H. Qian, Bin Yang, Jiqing Zhao","doi":"10.1002/maco.202112652","DOIUrl":"https://doi.org/10.1002/maco.202112652","url":null,"abstract":"A newly developed technology, rotationally accelerated shot peening (RASP), was used to produce the nanocrystals on the surface of 316LN stainless steel. The effect of surface nanocrystallization on the oxide film properties of the steel in a high temperature and high‐pressure aqueous environment was studied. It was found that the outer layer of the oxide film consisted of NiFe2O4 with a loose spinel structure. The inner layer distributed tiny Cr2O3 particles compactly. The oxide films that grew on the RASP‐treated 316LN showed thicker and denser with higher corrosion resistance than on the as‐received steel. The nanostructures produced by RASP enhanced the formation of the superior oxide film. However, the deformation defects caused by RASP were harmful to the corrosion resistance. The results in this paper provide an easy way to enhance the corrosion resistance of the steel served in a high‐temperature aqueous environment.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"33 1","pages":"125 - 133"},"PeriodicalIF":0.0,"publicationDate":"2021-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90869173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The inhibition effect of amino acids l‐lysine (Lys) and l‐arginine (Arg), which serve as inhibition films for corrosion of 316L stainless steel in 0.5 M NaCl solution, is studied by electrochemical measurements. The adsorption of the inhibitor molecules on the steel surface is studied by Fourier transformed infrared spectroscopy (FTIR) and surface‐enhanced Raman spectroscopy (SERS), accompanied by the characterization of the metal surface by scanning electron microscopy (SEM). All in all, Lys or Arg can obviously restrain the corrosion of 316L steel, while the inhibition efficiency is even higher with the assistance of I− ions. Arg always has better inhibition performance than Lys regardless of the addition of I− ions. FTIR and SERS confirm the adsorption of amino acids on the metal surface; at the same time, the morphology and protection effect of the inhibition films is clearly illustrated via SEM images. Thanks to all experimental measurements as mentioned above and theoretical calculations, a mechanism model is proposed to simulate the corrosion inhibition process of amino acids and the synergistic effect of I− ions on 316L steel.
采用电化学方法研究了赖氨酸(Lys)和精氨酸(Arg)作为缓蚀膜对316L不锈钢在0.5 M NaCl溶液中的缓蚀作用。利用傅里叶变换红外光谱(FTIR)和表面增强拉曼光谱(SERS)研究了抑制剂分子在钢表面的吸附，并利用扫描电镜(SEM)对金属表面进行了表征。综上所述，Lys或Arg能明显抑制316L钢的腐蚀，而I−离子的缓蚀效果更高。无论是否添加I -离子，精氨酸的缓蚀性能都优于赖氨酸。FTIR和SERS证实了金属表面对氨基酸的吸附;同时，通过扫描电镜(SEM)图像清楚地说明了缓蚀膜的形态和保护效果。通过上述实验测量和理论计算，提出了一个机制模型来模拟氨基酸对316L钢的缓蚀过程和I -离子的协同作用。
{"title":"Corrosion inhibition of amino acids for 316L stainless steel and synergistic effect of I− ions: Experimental and theoretical studies","authors":"Rongxuan Zhao, Qian Yu, L. Niu","doi":"10.1002/maco.202112511","DOIUrl":"https://doi.org/10.1002/maco.202112511","url":null,"abstract":"The inhibition effect of amino acids l‐lysine (Lys) and l‐arginine (Arg), which serve as inhibition films for corrosion of 316L stainless steel in 0.5 M NaCl solution, is studied by electrochemical measurements. The adsorption of the inhibitor molecules on the steel surface is studied by Fourier transformed infrared spectroscopy (FTIR) and surface‐enhanced Raman spectroscopy (SERS), accompanied by the characterization of the metal surface by scanning electron microscopy (SEM). All in all, Lys or Arg can obviously restrain the corrosion of 316L steel, while the inhibition efficiency is even higher with the assistance of I− ions. Arg always has better inhibition performance than Lys regardless of the addition of I− ions. FTIR and SERS confirm the adsorption of amino acids on the metal surface; at the same time, the morphology and protection effect of the inhibition films is clearly illustrated via SEM images. Thanks to all experimental measurements as mentioned above and theoretical calculations, a mechanism model is proposed to simulate the corrosion inhibition process of amino acids and the synergistic effect of I− ions on 316L steel.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"15 1","pages":"31 - 44"},"PeriodicalIF":0.0,"publicationDate":"2021-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84965695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The deterioration process and corrosion protective effect of 7B04 aluminum alloy/anodic film/epoxy primer system in acidic NaCl solution for 3024 h were investigated by optical/electron microscopes, electrochemical impedance spectroscopy (EIS), scanning Kelvin probe (SKP), and pull‐off adhesion test. The results showed that the protective system of anodic film and epoxy primer can protect aluminum alloy from pitting corrosion after immersion for 2352 h. According to the response characteristics of EIS and SKP, different stages of the failure process could be identified. During the first 100 h of immersion, the water transport in the coating followed Fickian law, and the water diffusion coefficient was 2.03 × 10−11 cm2/s, which demonstrated that the coating has good impermeability. Anodizing and coating treatment improved the open circuit potential and impedance of 7B04 aluminum alloy and made the distribution of Volta potential more uniform. The decreasing rate of wet adhesion strength was first fast and then slow, which was similar to the variation rule of coating resistance. The anodic film enhanced the adhesion between epoxy primer and substrate so that the failure nature of the adhesion test was mainly the cohesive failure of the epoxy primer.
{"title":"The long‐term corrosion performance and adhesion properties of 7B04 aluminum alloy/anodic film/epoxy primer system in acidic NaCl solution","authors":"Yangguang Zhang, Y. Chen, Yong Zhang, G. Bian","doi":"10.1002/maco.202112527","DOIUrl":"https://doi.org/10.1002/maco.202112527","url":null,"abstract":"The deterioration process and corrosion protective effect of 7B04 aluminum alloy/anodic film/epoxy primer system in acidic NaCl solution for 3024 h were investigated by optical/electron microscopes, electrochemical impedance spectroscopy (EIS), scanning Kelvin probe (SKP), and pull‐off adhesion test. The results showed that the protective system of anodic film and epoxy primer can protect aluminum alloy from pitting corrosion after immersion for 2352 h. According to the response characteristics of EIS and SKP, different stages of the failure process could be identified. During the first 100 h of immersion, the water transport in the coating followed Fickian law, and the water diffusion coefficient was 2.03 × 10−11 cm2/s, which demonstrated that the coating has good impermeability. Anodizing and coating treatment improved the open circuit potential and impedance of 7B04 aluminum alloy and made the distribution of Volta potential more uniform. The decreasing rate of wet adhesion strength was first fast and then slow, which was similar to the variation rule of coating resistance. The anodic film enhanced the adhesion between epoxy primer and substrate so that the failure nature of the adhesion test was mainly the cohesive failure of the epoxy primer.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"250 1","pages":"105 - 93"},"PeriodicalIF":0.0,"publicationDate":"2021-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76187901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dongpeng Wang, Xin Li, Z. Chen, Shuai Wang, Yuxin Wang, Wei-hong Liu, Weili Li, R. Xue, C. Liu
The influence and susceptibility of chloride ion concentration, temperature, and surface roughness on corrosion behavior of single‐phase CoCrFeNi medium‐entropy alloy (MEA) was examined in NaCl solution. Potentiodynamic polarization results revealed that the corrosion performance of the sample deteriorated with an increase of the chloride ion concentration, temperature, and surface roughness. The pitting potential decreased drastically for samples with higher surface roughness. According to electrochemical impedance spectroscopy, the charge transfer resistance decreased when chloride ion concentration, temperature, and surface roughness increased. Scanning electron micrographs also indicated an increased extent of corrosion damage, especially for the sample with higher surface roughness. It is found that the corrosion resistance is closely related to the wettability of samples, and the surface with the highest roughness shows higher hydrophilicity. The combined results suggested that the pitting damage is more sensitive to surface roughness. Our findings provide a further understanding of the corrosion mechanism of MEAs and guide their applications as structural materials.
{"title":"Susceptibility of chloride ion concentration, temperature, and surface roughness on pitting corrosion of CoCrFeNi medium‐entropy alloy","authors":"Dongpeng Wang, Xin Li, Z. Chen, Shuai Wang, Yuxin Wang, Wei-hong Liu, Weili Li, R. Xue, C. Liu","doi":"10.1002/maco.202112557","DOIUrl":"https://doi.org/10.1002/maco.202112557","url":null,"abstract":"The influence and susceptibility of chloride ion concentration, temperature, and surface roughness on corrosion behavior of single‐phase CoCrFeNi medium‐entropy alloy (MEA) was examined in NaCl solution. Potentiodynamic polarization results revealed that the corrosion performance of the sample deteriorated with an increase of the chloride ion concentration, temperature, and surface roughness. The pitting potential decreased drastically for samples with higher surface roughness. According to electrochemical impedance spectroscopy, the charge transfer resistance decreased when chloride ion concentration, temperature, and surface roughness increased. Scanning electron micrographs also indicated an increased extent of corrosion damage, especially for the sample with higher surface roughness. It is found that the corrosion resistance is closely related to the wettability of samples, and the surface with the highest roughness shows higher hydrophilicity. The combined results suggested that the pitting damage is more sensitive to surface roughness. Our findings provide a further understanding of the corrosion mechanism of MEAs and guide their applications as structural materials.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"127 1","pages":"106 - 115"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85723798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Masthead: Materials and Corrosion. 08/2021","authors":"","doi":"10.1002/maco.202170082","DOIUrl":"https://doi.org/10.1002/maco.202170082","url":null,"abstract":"","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"182 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81062425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Boschmann Käthler, G. Ebell, S. Kessler, Y. Schiegg, C. Dauberschmidt, U. Angst
{"title":"A comparison of methods to assess the resistance of reinforcing steel against chloride‐induced corrosion in concrete: Particular consideration of 12% chromium steel","authors":"C. Boschmann Käthler, G. Ebell, S. Kessler, Y. Schiegg, C. Dauberschmidt, U. Angst","doi":"10.1002/MACO.202112609","DOIUrl":"https://doi.org/10.1002/MACO.202112609","url":null,"abstract":"","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"79 6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73037273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Juan Wang, Bin Li, Ruihong Li, Xuan Chen, Guojun Zhang
A multilayered oxidation protection coating consisting of MoSi2 outer layer, Mo5Si3 internal layer, and Mo5SiB2/MoB inner layer was developed on the surface of Mo–12Si–8.5B 1.0 wt% ZrB2 alloy via Si pack cementation. The multilayered coating significantly enhanced the oxidation resistance of the alloy at 900°C, 1100°C, and 1300°C in the air by exhibiting negligible oxidation recession. MoSi2 outer layer provided admirable oxidation protection for the alloy at high temperatures by forming a thin and protective SiO2‐rich glass scale on its surface. This was supplemented by the Mo5Si3 internal layer and Mo5SiB2/MoB inner layer that reduced the thermal expansion mismatch between the MoSi2 outer layer and substrate, and therefore no obvious cracks were found in the MoSi2 outer layer. More importantly, the Mo5SiB2/MoB layer as an in situ barriers of Si interdiffusion ensured the stable existence of MoSi2 and Mo5Si3 layers without obvious thickness change during oxidation at 900°C and 1100°C. Mechanical property test indicated that the formation of the coating layers could not affect the fracture toughness of the alloy.
{"title":"Establishing multilayered coating on Mo–12Si–8.5 B alloy by Si pack cementation and its oxidation behavior at 900°C–1300°C","authors":"Juan Wang, Bin Li, Ruihong Li, Xuan Chen, Guojun Zhang","doi":"10.1002/maco.202012146","DOIUrl":"https://doi.org/10.1002/maco.202012146","url":null,"abstract":"A multilayered oxidation protection coating consisting of MoSi2 outer layer, Mo5Si3 internal layer, and Mo5SiB2/MoB inner layer was developed on the surface of Mo–12Si–8.5B 1.0 wt% ZrB2 alloy via Si pack cementation. The multilayered coating significantly enhanced the oxidation resistance of the alloy at 900°C, 1100°C, and 1300°C in the air by exhibiting negligible oxidation recession. MoSi2 outer layer provided admirable oxidation protection for the alloy at high temperatures by forming a thin and protective SiO2‐rich glass scale on its surface. This was supplemented by the Mo5Si3 internal layer and Mo5SiB2/MoB inner layer that reduced the thermal expansion mismatch between the MoSi2 outer layer and substrate, and therefore no obvious cracks were found in the MoSi2 outer layer. More importantly, the Mo5SiB2/MoB layer as an in situ barriers of Si interdiffusion ensured the stable existence of MoSi2 and Mo5Si3 layers without obvious thickness change during oxidation at 900°C and 1100°C. Mechanical property test indicated that the formation of the coating layers could not affect the fracture toughness of the alloy.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"32 1","pages":"1328 - 1337"},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85390342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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