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利用高速电弧喷涂技术在A3钢基体上制备了厚度约200μm的Zn-15Al和Zn-Al-Mg-RE涂层。利用铜加速盐雾试验考察了两种涂层在含钠和氯粒子环境下的腐蚀情况。利用扫描电镜研究了涂层在腐蚀前后的形貌变化规律,利用XRD分析了腐蚀产物的相结构,利用动电位极化曲线研究了两种涂层在3.5%氯化钠溶液中的腐蚀行为。结果表明,在含钠和氯粒子环境下,Zn-Al-Mg-RE涂层耐腐蚀性能优于Zn-15Al涂层。
Zn-15Al and Zn-Al-Mg-RE coatings with a thickness of about 200μm were prepared on A3 steel by high-speed arc spraying. Copper accelerated salt spray test was used to investigate the corrosion of two coatings in the presence of sodium and chloride particles. The morphologies of the coatings before and after etching were studied by scanning electron microscopy. The phase structures of the corrosion products were analyzed by XRD. The corrosion behaviors of the two coatings in 3.5% sodium chloride solution were studied by potentiodynamic polarization curves. The results show that the corrosion resistance of Zn-Al-Mg-RE coating is better than Zn-15Al coating in the environment containing sodium and chlorine particles.