Effects of Zn2+ concentration and pH on the zinc phosphate conversion coatings on AZ31 magnesium alloy

Improved performance of cerium conversion coatings on steel with zinc phosphate post-treatment

“…The phosphate based conversion coatings have been widely used to modify the corrosion resistance of the metal substrate and provide good adhesion of the organic coating on the steel substrate. It has been shown that surface treatment of the steel sample by the zinc phosphate conversion layer can result in significant increase of the epoxy coating adhesion properties and corrosion resistance [29,30].…”

Treatment of toxic metal aqueous solutions: Encapsulation in a phosphate-calcium aluminate matrix

“…Our hypothesis is based on the large amount of cationic aquosols of Zn in comparison with either Pb or Cu. These Zn aquosols were able to react with hydrogen phosphate anions yielding insoluble Zn phosphates (Phuong et al, 2013) -with a good entalphy of formation (Wagh and Jeong, 2003) -and thus hindering the calcium from being released from calcium aluminate compounds. The withdrawal of the hydrogen phosphate anions on one side, and the blockage of the calcium release on the other side, obstructed the formation of the binding phase, mainly composed of ACP (Swift et al, 2013b).…”

Evaluation of the protective ability of typical corrosion inhibitors for magnesium alloys towards the Mg ZK30 variant

“…The results revealed that the Schiff base exhibits an inhibiting effect on the magnesium alloy, which depends on the concentration. The corrosion protection of AZ31 magnesium alloy was also studied by lots of groups using phosphate solutions containing several inorganic salts [12][13][14][15]. The reported results indicated the formation of phosphate conversion coatings on the metal surfaces including elements of the corresponding salts.…”