Characterization and electrochemical assessment of Al-Zn-In alloy with trivalent chromium process coating
By Wang, Xi; Yang, Fan; Viswanathan, Gopal; Wang, Shan-Shan; Frankel, G. S.
Published in Corrosion Science
Corrosion Science
2020
Abstract
To reduce self-corrosion of Al-Zn-In pigments in an Al-rich primer, trivalent chromium process (TCP) was applied to the pigments before mixing in the epoxy binder. The formation of TCP and its effects on both the Al-Zn-In bulk alloy and pigment particles were investigated in this study. The TCP layer on the Al-Zn-In alloy has a bilayer structure similar to TCP layers formed on other alloys. The corrosion rate of bulk Al-Zn-In alloy is reduced by the TCP treatment. The TCP layer likely blocks the access of Cl? to the Al-Zn-In alloy, which reduces corrosion attack initiation.