Improvement of anticorrosion and adhesion to magnesium alloy by
phosphate coating formed at room temperature
phosphate coating formed at room temperature
(Advanced Material Research and Development Centre, Zhejiang Industry and Trade Polytechnic,
Wenzhou 325003, China)
Wenzhou 325003, China)
Abstract: A new surface protection process was developed to magnesium alloy against corrosion in aggressive environments. Firstly, a phosphate coating was formed on rinsed magnesium alloy. Then, powder painting was carried out on the phosphated magnesium alloy. Surface morphologies and phase compositions of the phosphate coating were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that the phosphate coatings formed in bath containing earth additives at room temperature have dense and fine microstructure. The phosphate coating provides excellent paint adhesion to the magnesium alloy. Salt spray tests indicate that the corrosion resistance of the phosphate coating plus paint could meet the demand of magnesium alloy automobile components in aggressive environments.
Key words: anticorrosion; adhesion; magnesium alloy; paint; phosphate coating