Preparation of Trivalent Chromium Coating on 6063 Aluminum Alloy

Jian-Zhen HUANG, You-Xiong LUO

Abstract


The trivalent chromium coating was deposited on the surface of 6063 aluminum alloy with Cr2(SO4)3, H3PO4 and K2ZrF6. The performances of trivalent chromium conversion coating were analyzed by CuSO4 dropping corrosion test, electrochemical polarization curve, scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDAX). The conversion coating shows gray color and consists of Cr, Zr, K, Al, P, O. The analytical results indicate that the aluminum alloy coated with trivalent chromium exhibits better corrosion resistance than the pure aluminum alloy.

Keywords


Aluminum alloy, Trivalent chromium, Coating, Corrosion resistance


DOI
10.12783/dtmse/icmsea/mce2017/10790

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