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Preparation and characterization of colored Ti/Zr conversion coating on AZ91D magnesium alloy

A golden-yellow Ti/Zr conversion coating on AZ91D substrate was successfully prepared in the solution containing titanium and zirconium ions with the addition of tannic acid. The growth process, microstructure, composition and corrosion resistance of this conversion coating were characterized by EDS...

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Published in:Surface & coatings technology 2015-08, Vol.276, p.239-247
Main Authors: Yi, Aihua, Du, Jun, Wang, Jian, Mu, Songling, Zhang, Guoge, Li, Wenfang
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Language:English
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description A golden-yellow Ti/Zr conversion coating on AZ91D substrate was successfully prepared in the solution containing titanium and zirconium ions with the addition of tannic acid. The growth process, microstructure, composition and corrosion resistance of this conversion coating were characterized by EDS, SEM, XRD, XPS, FTIR and electrochemical workstation. The application of H2ZrF6 and tannic acid was the key to the coating color. The coating possessed a double-layer structure, in which the inner layer was made up of Mg(OH)2, MgO, TiO2, ZrO2, and MgF2, and the outer layer was metal–organic complex. The π electronic chromophore in the metal–organic complex produced the conversion coating color. The coating was uniform and compact, leading to improved corrosion resistance and significantly reduced corrosion current density (from 93.72μA·cm−2 to 1.047μA·cm−2). •A novel colored Ti/Zr conversion coating was obtained on the surface of AZ91D alloy.•The co-existence of H2TiF6 and tannic acid is the key factor to color the coating.•The coating mainly consists of coating Mg(OH)2, MgF2, MgO, TiO2, ZrO2 and metal–organic complex.•The metal–organic complex located in the superficial layer makes the coating golden-yellow.•The colored Ti/Zr coating exhibits excellent corrosion resistance.
doi_str_mv 10.1016/j.surfcoat.2015.06.069
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subjects Coatings
Colorization
Conversion coating
Coordination compounds
Corrosion resistance
Magnesium alloys
Magnesium base alloys
Protective coatings
Tannic acid
Titanium
Titanium dioxide
Zirconium
title Preparation and characterization of colored Ti/Zr conversion coating on AZ91D magnesium alloy
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