电弧喷涂Zn、Al及Zn-Al防护涂层的耐蚀性研究

hermal sprayed metal coating has become the preferred way to protect steel structures in oceanic circumstances. This work investigated corrosion behavior of Zn, Al and Zn-Al anti-corrosion coating in chloride aqueous solution through soaking tests, EIS(Electrochemical Impedance Spectroscopy) measurement and corrosion morphology observation, aiming to find out the optimal protective coating. The results show that Zn coating exhibits self-sealing function in Cl-containing medium, but the self-sealing effect is weak for the loose corrosion products. Al and Zn-Al coatings indicate better corrosion resistance, resulted from the dense corrosion products and the better self-sealing effect. These Arc-sprayed coatings are far better than pure Zn coating for the steel structures in oceanic circumstances.