Acta Metallurgica Sinica (English Letters)

, Volume 30, Issue 4, pp 306–318 | Cite as

Performance of Corrosion-Resistant Alloys in Concentrated Acids

  • Ajit MishraEmail author


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.


Nickel–chromium–molybdenum–tungsten Corrosion-resistant alloys Reducing acid Oxidants Localized corrosion Surface characterization 



The author acknowledges the efforts of Corrosion technician Ryan Markley and Jeff Dillman from Haynes International (US) in conducting the corrosion tests and Surface Science Western (SSW) at Western University, Canada, for the XPS study. The author also acknowledges Dr. Paul Crook and Dr. Paul Manning from Haynes International for technical discussion.


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Copyright information

© The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Research and TechnologyHaynes InternationalKokomoUSA

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