Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 23    No. 5    May 2013

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Enhanced corrosion resistance of phytic acid coated magnesium by stearic acid treatment
R. K. GUPTA, K. MENSAH-DARKWA, J. SANKAR, D. KUMAR

Engineering Research Center for Revolutionizing Metallic Biomaterials (ERC-RMB),North Carolina A&T State University, 1601 East Market Street, Greensboro, NC-27411, USA

Abstract:A green chemical conversion coating for magnesium was obtained with a phytic acid solution. The microstructure and corrosion properties of phytic acid conversion coated magnesium were further improved by soaking in stearic acid solution. The phytic acid conversion coated magnesium after soaking in the stearic acid showed no micro-cracks and the surface became very smooth. The corrosion behavior of the uncoated and coated magnesium samples was studied by electrochemical methods. The corrosion resistance of the stearic acid treated sample was much higher than that of phytic acid conversion coated magnesium or uncoated magnesium. The electrochemical results indicated that the stearic acid treated coating provided effective corrosion protection to the magnesium sample.

 

Key words: magnesium; phytic acid; stearic acid; corrosion; impedance spectroscopy

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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