Performance of Corrosion-Resistant Alloys in Concentrated Acids
来源期刊：Acta Metallurgica Sinica2017年第4期
论文作者：Ajit Mishra
文章页码：306 - 318
摘 要：Nickel alloys containing optimum amounts of chromium（Cr）,molybdenum（Mo） and tungsten（W） are widely used in the chemical processing industries due to their tolerance to both oxidizing and reducing conditions.Unlike stainless steel（SS）,Ni-Cr-Mo（W） alloys exhibit remarkably high uniform corrosion resistance in major concentrated acids,like hydrochloric acid（HCl） and sulfuric acid（H2SO4）.A higher uniform corrosion resistance of Ni-Cr-Mo（W） alloys,compared to other alloys,in concentrated acids can be attributed to the formation of protective oxide film of Mo and W in reducing acids,and Cr oxide film in oxidizing solutions.The localized corrosion resistance of Ni-Cr-Mo（W） alloys,containing high amount Cr as well as Mo（or Mo + W）,is also significantly higher than that of other commercially available alloys.The present study investigates the role of alloying elements,in nickel alloys,to uniform corrosion resistance in concentrated acids（HCl,HCl + oxidizing impurities and H2SO4） and localized corrosion performance in chloride-rich environments using ASTM G-48 test methodology.The corrosion tests were conducted on various alloys,and the results were analyzed using weight loss technique and electrochemical techniques,in conjunction with surface characterization tools.
Ajit Mishra
摘 要：Nickel alloys containing optimum amounts of chromium（Cr）,molybdenum（Mo） and tungsten（W） are widely used in the chemical processing industries due to their tolerance to both oxidizing and reducing conditions.Unlike stainless steel（SS）,Ni-Cr-Mo（W） alloys exhibit remarkably high uniform corrosion resistance in major concentrated acids,like hydrochloric acid（HCl） and sulfuric acid（H2SO4）.A higher uniform corrosion resistance of Ni-Cr-Mo（W） alloys,compared to other alloys,in concentrated acids can be attributed to the formation of protective oxide film of Mo and W in reducing acids,and Cr oxide film in oxidizing solutions.The localized corrosion resistance of Ni-Cr-Mo（W） alloys,containing high amount Cr as well as Mo（or Mo + W）,is also significantly higher than that of other commercially available alloys.The present study investigates the role of alloying elements,in nickel alloys,to uniform corrosion resistance in concentrated acids（HCl,HCl + oxidizing impurities and H2SO4） and localized corrosion performance in chloride-rich environments using ASTM G-48 test methodology.The corrosion tests were conducted on various alloys,and the results were analyzed using weight loss technique and electrochemical techniques,in conjunction with surface characterization tools.
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