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Journal of Materials Sciences and Applications

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Development of New Alternative Environmental-Friendly Passivatorfor Zinc Coated Sheets

Journal of Materials Sciences and Applications
Vol.3 , No. 4, Publication Date: Aug. 29, 2017, Page: 58-65

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Authors

[1]	Saravanan Pandurangan, R&D Center for Iron and Steel, Steel Authority of India Limited, Ranchi, India.
[2]	Srikanti Srikanth, R&D Center for Iron and Steel, Steel Authority of India Limited, Ranchi, India.
[3]	Santhosh kumar, R&D Center for Iron and Steel, Steel Authority of India Limited, Ranchi, India.

Abstract

Commercially available Tri-chromium and chrome-free passivator were evaluated with respect to their white rust resistance to the salt environment. The study also focused to evolve new environmental-friendly passivator for zinc-coated sheets. The corrosion behavior and mechanism of passivated samples are studised by electrochemical techniques. From electrochemical corrosion studies, the corrosion rates of commercial available chrome free passivator, tannic acid (t) and cerium+tannic acid passivated samples were identified as (2 to 3), 1.4, and 0.4 mpy, respectively. Cerium+tannic acid passivated samples exhibited a better corrosion resistance than commercial chrome-free or tannic acid passivated samples.

Keywords

Tri-chromium Passivator, Chrome-free Passivator, Zinc Coated Sheets Corrosion, Cerium and Tannic Acid

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