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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 6    December 2006

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Growth and corrosion behavior of rare earth film on hot-dip galvanized steel
LU Jin-tang(卢锦堂), WU Hai-jiang(吴海江), KONG Gang(孔 纲), 
CHE Chun-shan(车淳山), XU Qiao-yu(许乔瑜)

College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China

Abstract:  Hot-dip galvanized(HDG) steel sheets were treated for 30 s−24 h by the rare earth aqueous solution containing 20 g/L Ce(NO3)3∙6H2O, and the growth behavior and corrosion resistance of the rare earth film were investigated by SEM, EDS, AES and NSS. The results reveal that the rare earth film becomes thick while the mass gain of the samples does not distinctly change due to the zinc dissolution with the increase of treatment time. The film grows up more quickly and is apt to cracking in the vicinity of zinc grain boundaries, and eventually the film partly warps and flakes off with increasing film thickness. The NSS results show that the corrosion resistance of the film is dominated by both the film thickness and the cracks. With increasing treatment time, the corrosion resistance of the film increases within 1 h due to the increased film thickness and decreases after 1 h because the cracking and flaking off gradually become dominant factor.

 

Key words: rare earth film; hot dip galvanizing; corrosion resistance

ISSN 1672-7029
CN 43-1423/U

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