STUDY ON MICROSTRUCTURE AND THE MECHANISM OFZINC-ALUMINUM-CHROMIUM CONVERSION COATING

J Chin Soc Corr Pro

2002, Vol. 22

Issue (5): 269-273 DOI:

Research Report

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STUDY ON MICROSTRUCTURE AND THE MECHANISM OFZINC-ALUMINUM-CHROMIUM CONVERSION COATING

Shumin Han;Yangzeng Zheng;Shengxue Yu

燕山大学

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Abstract The composition,phase and microstructure of zinc-al uminum-chromium conversion coating were studied by XRD,SEM,EDS,EPMA and XPS etc. The mechanism of coating formation was proposed.Results showed that the main ele ments in the coating are zinc,aluminum and chromium.Zinc and aluminum existed mo stly as zero-valent zinc and zero-valent aluminum,but chromium existed mostly as trivalent chromium oxide.There were lots of zinc and aluminum particles in the coating phase,when heating the coated substrate approximately to 300℃,t he hexavalent chromium was reduced to an insoluble amorphous oxide,nCrO3·mC r2O3,by the organic substance such as succinic acid,which acted as a binde r f or the particles of zinc and aluminum to form a film.At the same time,the chromi c acid in the treatment chemical reacted with the metal surface of the substrate forming a chemical bond providing strong adhesion.

Key words: zinc-aluminum-chromium coating conversion coating micr ostructure

Received: 19 March 2001

ZTFLH:

TG174.4

Corresponding Authors: Shumin Han E-mail: hanshm@ysu.edu.cn

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Shumin Han; Yangzeng Zheng; Shengxue Yu. STUDY ON MICROSTRUCTURE AND THE MECHANISM OFZINC-ALUMINUM-CHROMIUM CONVERSION COATING. J Chin Soc Corr Pro, 2002, 22(5): 269-273 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I5/269

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