Properties of ZnO/ZnAl$_2$O$_4$ composite PEO coatings on zinc

TL;DR

This study investigates the properties of ZnO/ZnAl₂O₄ composite PEO coatings on zinc, focusing on their adhesion, wear, corrosion, and photocatalytic activity to evaluate potential applications.

Contribution

It provides a detailed analysis of the physical and functional properties of ZnO/ZnAl₂O₄ coatings formed on zinc via PEO, highlighting their structural weaknesses and limited photocatalytic performance.

Findings

Coatings exhibit internal porosity and low cohesion.

Pull-off tests show rupture at about 1 MPa.

Photocatalytic activity is limited despite higher ZnO content.

Abstract

Recently the successful formation of PEO coatings on zinc in a phosphate aluminate electrolyte was shown. The produced composite coatings contain various mixtures of ZnO and ZnAl$_2$O$_4$. In frame of the current study, the properties of the formed coatings including adhesion/cohesion, wear, corrosion and photocatalytic activity were analysed to identify possible applications. However, the coatings show internal porosity and a sponge-like structure. Thus the cohesion within the coating is quite low. Pull-off tests have demonstrated clear rupture within the PEO layer at strength values as low as 1 MPa. The photocatalytic activity is limited, in spite of the formation of a higher amount of ZnO at shorter treatment times. Interestingly, the composite coatings of ZnO and higher amounts of ZnAl$_2$O$_4$ spinel showed a higher activity, but not sufficient for fast and effective catalytic cleaning applications.