Pub Date : 2022-08-11DOI: 10.1080/1478422X.2022.2111038
Saifei Xu, Yong Hu, Jinsong Tian, Kaijiang Xue
ABSTRACT Mg-based bulk metallic glass (BMG) is a biodegradable metal with significant potential advantages as an implant material. To investigate the effect of Sr addition on the glass-forming ability (GFA) and its effect on the mechanical properties and corrosion behaviours of Mg–Zn–Ca–Cu BMG, a series of Mg66-x Zn29.5Ca4Cu0.5Sr x (x = 0, 0.3, 0.6, and 0.9 at.-%) were synthesised and investigated in this study. Microstructural characterisation, GFA and corrosion resistance measurements were carried out by XRD, DSC, SEM, immersion and electrochemical corrosion tests. The results showed that the addition of Sr improved the GFA and mechanical properties and enhanced and adjustable corrosion performance. In addition, the mechanical and corrosion property analyses showed that the Mg65.7Zn29.5Ca4Cu0.5Sr0.3 alloy exhibited the best mechanical properties and bio-corrosion resistance.
{"title":"Effects of Sr on the glass-forming ability and corrosion behaviour of Mg–Zn–Ca–Cu bulk metallic glass","authors":"Saifei Xu, Yong Hu, Jinsong Tian, Kaijiang Xue","doi":"10.1080/1478422X.2022.2111038","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2111038","url":null,"abstract":"ABSTRACT Mg-based bulk metallic glass (BMG) is a biodegradable metal with significant potential advantages as an implant material. To investigate the effect of Sr addition on the glass-forming ability (GFA) and its effect on the mechanical properties and corrosion behaviours of Mg–Zn–Ca–Cu BMG, a series of Mg66-x Zn29.5Ca4Cu0.5Sr x (x = 0, 0.3, 0.6, and 0.9 at.-%) were synthesised and investigated in this study. Microstructural characterisation, GFA and corrosion resistance measurements were carried out by XRD, DSC, SEM, immersion and electrochemical corrosion tests. The results showed that the addition of Sr improved the GFA and mechanical properties and enhanced and adjustable corrosion performance. In addition, the mechanical and corrosion property analyses showed that the Mg65.7Zn29.5Ca4Cu0.5Sr0.3 alloy exhibited the best mechanical properties and bio-corrosion resistance.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"625 - 629"},"PeriodicalIF":1.8,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47339344","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 : 2022-08-05DOI: 10.1080/1478422X.2022.2106285
Wenli Wang, Jing Ke, Lintong Guo
ABSTRACT The applications of magnesium alloys are limited because of their poor corrosion properties. In this study, the corrosion behaviours of Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr alloy in 3.5 wt-% NaCl solution were investigated, the results suggested that the precipitations of rare-earth phase, (Mg, Zn)3(Y, Sm) and Mg12(Y, Sm) Zn, are beneficial to enhance the anti-corrosion of magnesium alloys. The network second phase, (Mg, Zn)3(Y, Sm), may act as an anode. It can form a galvanic couple with the adjacent α-Mg matrix and effectively protect the α-Mg matrix. The existence of the Mg12(Y, Sm) Zn phase makes the distribution of the (Mg, Zn)3(Y, Sm) phase more uniform, which may produce a more uniform electrochemical structure and reduce the galvanic corrosion. Under the dual action of the two second phases, the corrosion performance of Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr alloy was better than that of the standard AZ31B alloy. The corrosion mechanism of the alloy is galvanic corrosion due to the second phase with low potential.
{"title":"Corrosion behaviour and properties of Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr Alloy in 3.5 wt-% NaCl solution","authors":"Wenli Wang, Jing Ke, Lintong Guo","doi":"10.1080/1478422X.2022.2106285","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2106285","url":null,"abstract":"ABSTRACT The applications of magnesium alloys are limited because of their poor corrosion properties. In this study, the corrosion behaviours of Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr alloy in 3.5 wt-% NaCl solution were investigated, the results suggested that the precipitations of rare-earth phase, (Mg, Zn)3(Y, Sm) and Mg12(Y, Sm) Zn, are beneficial to enhance the anti-corrosion of magnesium alloys. The network second phase, (Mg, Zn)3(Y, Sm), may act as an anode. It can form a galvanic couple with the adjacent α-Mg matrix and effectively protect the α-Mg matrix. The existence of the Mg12(Y, Sm) Zn phase makes the distribution of the (Mg, Zn)3(Y, Sm) phase more uniform, which may produce a more uniform electrochemical structure and reduce the galvanic corrosion. Under the dual action of the two second phases, the corrosion performance of Mg–3.4Y–3.6Sm–2.6Zn–0.8Zr alloy was better than that of the standard AZ31B alloy. The corrosion mechanism of the alloy is galvanic corrosion due to the second phase with low potential.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"613 - 624"},"PeriodicalIF":1.8,"publicationDate":"2022-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44483278","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 : 2022-07-30DOI: 10.1080/1478422X.2022.2105682
Anirban Naskar, Madhumanti Bhattacharyya, K. Raja, I. Charit, J. Darsell, S. Jana
ABSTRACT Severe plastic deformation of 304L stainless steel plate was carried out by friction stirring under an isothermal tool temperature at 825°C. The friction stirred zone showed extensive grain refinement, high fraction of low angle grain boundaries due to dislocation rearrangement, Σ3 and Σ9 special grain boundaries and discrete Fe–Cr–Mn-rich particles. Electrochemical polarisation measurements were done on the base metal (BM) and friction stir welded (FSW) specimens in the neutral and acidified 3.5% NaCl solutions. The BM showed marginally better pitting resistance in the neutral chloride solution than the FSW because of a larger fraction of special grain boundaries, and larger grain size. Whereas in acidified 3.5% NaCl solution, the FSW showed better corrosion resistance than the BM. The surface film of the FSW had a lower impedance and a lower defect concentration than the BM indicating higher diffusivity of point defects in the FSW.
{"title":"Room temperature corrosion behaviour of plastically deformed AISI 304 stainless steel by friction stir welding in neutral and acidified chloride solutions","authors":"Anirban Naskar, Madhumanti Bhattacharyya, K. Raja, I. Charit, J. Darsell, S. Jana","doi":"10.1080/1478422X.2022.2105682","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2105682","url":null,"abstract":"ABSTRACT Severe plastic deformation of 304L stainless steel plate was carried out by friction stirring under an isothermal tool temperature at 825°C. The friction stirred zone showed extensive grain refinement, high fraction of low angle grain boundaries due to dislocation rearrangement, Σ3 and Σ9 special grain boundaries and discrete Fe–Cr–Mn-rich particles. Electrochemical polarisation measurements were done on the base metal (BM) and friction stir welded (FSW) specimens in the neutral and acidified 3.5% NaCl solutions. The BM showed marginally better pitting resistance in the neutral chloride solution than the FSW because of a larger fraction of special grain boundaries, and larger grain size. Whereas in acidified 3.5% NaCl solution, the FSW showed better corrosion resistance than the BM. The surface film of the FSW had a lower impedance and a lower defect concentration than the BM indicating higher diffusivity of point defects in the FSW.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"599 - 612"},"PeriodicalIF":1.8,"publicationDate":"2022-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42622243","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 : 2022-07-25DOI: 10.1080/1478422x.2022.2103324
B. Kermani
{"title":"Dr John Christopher Scully, FICorr, FIMMM, CEng (9 July 1934–30 May 2022)","authors":"B. Kermani","doi":"10.1080/1478422x.2022.2103324","DOIUrl":"https://doi.org/10.1080/1478422x.2022.2103324","url":null,"abstract":"","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"598 - 598"},"PeriodicalIF":1.8,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41573938","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 : 2022-07-22DOI: 10.1080/1478422X.2022.2100601
V. Gattu, T. Rahman, W. Ebert, J. Indacochea
ABSTRACT A set of cast alloys was made by alloying 316L stainless steel powder with 5, 10, and 15 wt-% Mo to study the effects of the Mo content on the microstructures and corrosion behaviours. Sigma phases formed in all alloys and Laves phases co-precipitated in alloys with Mo additions of 10 and 15 wt-%. Alloys with higher Mo concentrations had greater volume fractions of both intermetallic phases, which contained higher Mo but lower Ni levels than the austenite. Potentiodynamic and potentiostatic tests were performed in pH 4 solution containing 10 mM NaCl to provide an aggressive chemical environment. All cast alloys had higher corrosion resistance than 316L SS. Electrochemical impedance spectroscopy showed the Mo content had a significant beneficial effect on the electrical properties of the passivating layers under highly oxidising conditions, but only a minor effect under moderately oxidising redox conditions.
摘要采用钼含量分别为5、10和15wt%的316L不锈钢粉末进行合金化处理，制备了一套铸造合金，研究了钼含量对组织和腐蚀行为的影响。在所有合金中形成的Sigma相和在Mo添加量为10和15wt%的合金中共同沉淀的Laves相。具有更高Mo浓度的合金具有更大的两个金属间相的体积分数，其包含比奥氏体更高的Mo但更低的Ni水平。在含有10 mM NaCl以提供侵蚀性化学环境。所有铸造合金都具有比316L SS更高的耐腐蚀性。电化学阻抗谱显示，在高度氧化的条件下，Mo含量对钝化层的电学性能有显著的有益影响，但在适度氧化的氧化还原条件下只有很小的影响。
{"title":"Effects of Mo additions on the potentiostatic corrosion behaviour of multiphase 316L SS-based alloys","authors":"V. Gattu, T. Rahman, W. Ebert, J. Indacochea","doi":"10.1080/1478422X.2022.2100601","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2100601","url":null,"abstract":"ABSTRACT A set of cast alloys was made by alloying 316L stainless steel powder with 5, 10, and 15 wt-% Mo to study the effects of the Mo content on the microstructures and corrosion behaviours. Sigma phases formed in all alloys and Laves phases co-precipitated in alloys with Mo additions of 10 and 15 wt-%. Alloys with higher Mo concentrations had greater volume fractions of both intermetallic phases, which contained higher Mo but lower Ni levels than the austenite. Potentiodynamic and potentiostatic tests were performed in pH 4 solution containing 10 mM NaCl to provide an aggressive chemical environment. All cast alloys had higher corrosion resistance than 316L SS. Electrochemical impedance spectroscopy showed the Mo content had a significant beneficial effect on the electrical properties of the passivating layers under highly oxidising conditions, but only a minor effect under moderately oxidising redox conditions.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"560 - 567"},"PeriodicalIF":1.8,"publicationDate":"2022-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49165470","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}
ABSTRACT To optimising the corrosion resistance mechanism of hot-rolled steel bar, the effects of different tempering temperatures and high-oxygen-rich oxidation times were studied by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, electrochemical and atmospheric corrosion tests. The thickness of the oxide layer of the rebar could reach 10 μm and rarely corroded after high-oxygen-rich oxidation at 850°C for 1 s, which exhibits superior corrosion resistance. The electrochemical test results showed that the I corr value after 1 s of high-oxygen-rich oxidation at 850°C was about 0.02 mA cm−2, which was 56.4% lower than that of the heated specimen at 685°C (0.045 mA cm−2). The results of Raman spectroscopy showed that the rust layer of the heated specimen at 685°C mainly consisted of α-Fe2O3, γ-FeOOH and α-FeOOH, and the oxidised layer after 1 s of high-oxygen-rich oxidation at 850°C mainly consisted of α-Fe2O3 and Fe3O4, which maintained the original oxidised layer morphology.
摘要为了优化热轧钢筋的耐腐蚀机理，通过扫描电子显微镜、X射线衍射、拉曼光谱、电化学和大气腐蚀试验，研究了不同回火温度和高富氧氧化时间对其耐腐蚀性能的影响。钢筋的氧化层厚度可达10 μm，在850°C下高富氧氧化1小时后很少腐蚀 s、 其表现出优异的耐腐蚀性。电化学测试结果表明，1 850°C下高富氧氧化的s约为0.02 mA cm−2，比685°C（0.045 mA）下加热试样的温度低56.4% cm−2）。拉曼光谱结果表明，685°C加热试样的锈层主要由α-Fe2O3、γ-FeOOH和α-FeOOH组成，1 850°C下的高富氧氧化主要由α-Fe2O3和Fe3O4组成，它们保持了原始的氧化层形态。
{"title":"Optimising the corrosion performance of hot-rolled steel bar in concrete","authors":"Qinghai Zhou, Yanbin Yin, Zhiming Liu, Jiongming Zhang","doi":"10.1080/1478422X.2022.2101179","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2101179","url":null,"abstract":"ABSTRACT To optimising the corrosion resistance mechanism of hot-rolled steel bar, the effects of different tempering temperatures and high-oxygen-rich oxidation times were studied by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, electrochemical and atmospheric corrosion tests. The thickness of the oxide layer of the rebar could reach 10 μm and rarely corroded after high-oxygen-rich oxidation at 850°C for 1 s, which exhibits superior corrosion resistance. The electrochemical test results showed that the I corr value after 1 s of high-oxygen-rich oxidation at 850°C was about 0.02 mA cm−2, which was 56.4% lower than that of the heated specimen at 685°C (0.045 mA cm−2). The results of Raman spectroscopy showed that the rust layer of the heated specimen at 685°C mainly consisted of α-Fe2O3, γ-FeOOH and α-FeOOH, and the oxidised layer after 1 s of high-oxygen-rich oxidation at 850°C mainly consisted of α-Fe2O3 and Fe3O4, which maintained the original oxidised layer morphology.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"568 - 579"},"PeriodicalIF":1.8,"publicationDate":"2022-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42183118","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 : 2022-07-15DOI: 10.1080/1478422X.2022.2099334
I. Elshamy, S. S. Abd El Rehim, M. Ibrahim, N. F. El Boraei
ABSTRACT The electrochemical behaviour of titanium dissolution and passivation in HCl was examined with and without the SCN− anions using potentiodynamic polarisation, electrochemical impedance spectroscopy, and current transients techniques. The nature of the Ti oxide film was characterised by utilising XPS and SEM tools. The corrosion current i corr, the critical passivation current i cc, and the passive current i pass values increased significantly when the HCl concentration, scan rate, and temperature were raised. On the contrary, the addition of SCN− anions decreases the i corr value, indicating that the Ti dissolution was inhibited as a result of SCN− adsorption on the Ti surface. The inhibition efficiency increased with increasing the concentration of SCN−. However, SCN− anions lead to destabilised passivity in the passive zone. The formation of the Ti oxide film is a diffusion-controlled operation, as shown by the i–t curves. According to the XPS measurements, the passive oxide coating consists mainly of TiO2 and less of Ti2O3.
{"title":"The bifunctional role played by thiocyanate anions on the active dissolution and the passive film of titanium in hydrochloric acid","authors":"I. Elshamy, S. S. Abd El Rehim, M. Ibrahim, N. F. El Boraei","doi":"10.1080/1478422X.2022.2099334","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2099334","url":null,"abstract":"ABSTRACT The electrochemical behaviour of titanium dissolution and passivation in HCl was examined with and without the SCN− anions using potentiodynamic polarisation, electrochemical impedance spectroscopy, and current transients techniques. The nature of the Ti oxide film was characterised by utilising XPS and SEM tools. The corrosion current i corr, the critical passivation current i cc, and the passive current i pass values increased significantly when the HCl concentration, scan rate, and temperature were raised. On the contrary, the addition of SCN− anions decreases the i corr value, indicating that the Ti dissolution was inhibited as a result of SCN− adsorption on the Ti surface. The inhibition efficiency increased with increasing the concentration of SCN−. However, SCN− anions lead to destabilised passivity in the passive zone. The formation of the Ti oxide film is a diffusion-controlled operation, as shown by the i–t curves. According to the XPS measurements, the passive oxide coating consists mainly of TiO2 and less of Ti2O3.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"542 - 552"},"PeriodicalIF":1.8,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41512280","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 : 2022-07-15DOI: 10.1080/1478422X.2022.2100456
M. Attarchi
ABSTRACT With the many advantages of instantaneous off measurement, the polarisation coupon has become increasingly popular in the true polarisation potential reading of different cathodic protection systems. As a general rule, polarisation coupons are installed close to the reference electrode to reduce the error in potential measurement. As a result, the error in the potential reading for close coupons is low. Still, the mentioned error has not been quantified due to the coupon's geometry, direction and non-linear polarisation behaviour complexity. In the present work, the IR-Drop error as a function of current density is extracted with generic calculation and simple assumptions, and the results are checked with three possible coupon-reference electrode arrangements. The proposed calculation could be used to extract the intrinsic error of polarisation coupons, regardless of their arrangement and coupon size. Moreover, it could be used to correct the measured potential and extract the true structure-to-soil potential.
{"title":"Quantitative evaluation method for cathodic protection polarisation coupon","authors":"M. Attarchi","doi":"10.1080/1478422X.2022.2100456","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2100456","url":null,"abstract":"ABSTRACT With the many advantages of instantaneous off measurement, the polarisation coupon has become increasingly popular in the true polarisation potential reading of different cathodic protection systems. As a general rule, polarisation coupons are installed close to the reference electrode to reduce the error in potential measurement. As a result, the error in the potential reading for close coupons is low. Still, the mentioned error has not been quantified due to the coupon's geometry, direction and non-linear polarisation behaviour complexity. In the present work, the IR-Drop error as a function of current density is extracted with generic calculation and simple assumptions, and the results are checked with three possible coupon-reference electrode arrangements. The proposed calculation could be used to extract the intrinsic error of polarisation coupons, regardless of their arrangement and coupon size. Moreover, it could be used to correct the measured potential and extract the true structure-to-soil potential.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"553 - 559"},"PeriodicalIF":1.8,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43458304","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 : 2022-07-09DOI: 10.1080/1478422X.2022.2096323
N. Upadhyay, A. R. Ravi Shankar, S. Singh, B. Anandkumar
ABSTRACT The effect of nitrogen on the pitting process is investigated using the electrochemical noise (EN) approach in 0.01 M FeCl3 for 24 h at a sampling frequency of 1 Hz. The EN signals were investigated using wavelet analysis on four alloys of 316L SS containing varying quantities of nitrogen (0.07, 0.12, 0.14 and 0.22 wt-% nitrogen). Using an energy distribution (ED) and standard deviation of partial signal (SDPS) plot, the primary corrosion process in various nitrogen-containing 316L SS was found. The ED plot showed that as the nitrogen percentage in the alloy increased, the energy of the low-frequency signal decreased, indicating that long-time transients were suppressed. The SDPS figure revealed a drop in pit density as nitrogen levels increased. For specimens containing 0.07, 0.11, 0.14 and 0.22 wt-% nitrogen, the pit density was determined to be 439 ± 8, 383 ± 6, 212 ± 6 and 108 ± 4 pits mm−2, respectively.
{"title":"Electrochemical noise studies on the effect of nitrogen on the pitting corrosion of stainless steel using wavelet analysis","authors":"N. Upadhyay, A. R. Ravi Shankar, S. Singh, B. Anandkumar","doi":"10.1080/1478422X.2022.2096323","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2096323","url":null,"abstract":"ABSTRACT The effect of nitrogen on the pitting process is investigated using the electrochemical noise (EN) approach in 0.01 M FeCl3 for 24 h at a sampling frequency of 1 Hz. The EN signals were investigated using wavelet analysis on four alloys of 316L SS containing varying quantities of nitrogen (0.07, 0.12, 0.14 and 0.22 wt-% nitrogen). Using an energy distribution (ED) and standard deviation of partial signal (SDPS) plot, the primary corrosion process in various nitrogen-containing 316L SS was found. The ED plot showed that as the nitrogen percentage in the alloy increased, the energy of the low-frequency signal decreased, indicating that long-time transients were suppressed. The SDPS figure revealed a drop in pit density as nitrogen levels increased. For specimens containing 0.07, 0.11, 0.14 and 0.22 wt-% nitrogen, the pit density was determined to be 439 ± 8, 383 ± 6, 212 ± 6 and 108 ± 4 pits mm−2, respectively.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"531 - 541"},"PeriodicalIF":1.8,"publicationDate":"2022-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44224514","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 : 2022-07-04DOI: 10.1080/1478422X.2022.2083746
Z. Que, B. Zajec, S. Ritter, T. Seppänen, T. Saario, A. Toivonen, A. Treichel, Valentin Lautaru, F. Scenini
ABSTRACT Surface treatments of primary circuit components in light water reactors are regarded as possible ways to mitigate environmentally-assisted cracking (EAC). To date, it is not fully conclusive which surface condition is suitable to reduce the EAC initiation susceptibility. Constant extension rate tensile (CERT) tests were performed by several labs using flat tapered tensile specimens with different surface conditions (ground, industrial face milled, advanced face milled and shot peened), exposed to a boiling water reactor normal water chemistry environment at 288°C. Despite some scatter in the results, the CERT tests revealed that the EAC initiation susceptibility seems lowest for the advanced face milled surface and highest for the shot peened surface. However, it must be emphasised that the differences were moderate and that the surprising behaviour of the shot peened surface can be explained. The mechanical grinding of the surface did not significantly retard EAC initiation compared to industrial face milling.
{"title":"Investigation of surface treatment effects on the environmentally-assisted cracking behaviour of Alloy 182 in boiling water reactor environment","authors":"Z. Que, B. Zajec, S. Ritter, T. Seppänen, T. Saario, A. Toivonen, A. Treichel, Valentin Lautaru, F. Scenini","doi":"10.1080/1478422X.2022.2083746","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2083746","url":null,"abstract":"ABSTRACT Surface treatments of primary circuit components in light water reactors are regarded as possible ways to mitigate environmentally-assisted cracking (EAC). To date, it is not fully conclusive which surface condition is suitable to reduce the EAC initiation susceptibility. Constant extension rate tensile (CERT) tests were performed by several labs using flat tapered tensile specimens with different surface conditions (ground, industrial face milled, advanced face milled and shot peened), exposed to a boiling water reactor normal water chemistry environment at 288°C. Despite some scatter in the results, the CERT tests revealed that the EAC initiation susceptibility seems lowest for the advanced face milled surface and highest for the shot peened surface. However, it must be emphasised that the differences were moderate and that the surprising behaviour of the shot peened surface can be explained. The mechanical grinding of the surface did not significantly retard EAC initiation compared to industrial face milling.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"474 - 485"},"PeriodicalIF":1.8,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48526027","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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