Effects of KH-570 Silane Electrochemical-assisted Deposition on Corrosion Resistance of AZ31B Magnesium Alloy

Abstract

Electrochemical-assisted deposition was used to treat AZ31B magnesium alloy with silanes. The effects of additive amounts of γ-(methacryloxy) propyltrimethoxysilane (KH-570) on quality and corrosion resistance of the formed films were studied by the potentiodynamic polarization curve, the electrochemical impedance spectroscopy and so forth. Besides, films in this research were modified by hydroxyapatite (HA) and cerium ion (Ce3+) and then the films' anti-corrosive quality were studied. The results show that a uniform, dense silane transparent film is formed on AZ31B magnesium alloy after silane electrochemical-assisted deposition, which hinders corrosion behaviors of magnesium alloy effectively and reduces the corrosion current density to a great extent; there is an optimum volume of KH-570 in silane electrochemical-assisted deposition, and the best film can be got when 8 mL KH-570 is added; the quality of film formed by electrochemical-assisted depositing KH-570 can be improved further through modifying silane solutions.

Keywords

• electrochemical-assisted deposition
• KH-570 silane
• AZ31B magnesium alloy
• electrochemical testing
• corrosion resistance