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采用低压冷喷涂技术在45号钢表面制备以镍为主的镍-锌-氧化铝复合涂层,对锌镍复合涂层进行锌熔点以上20℃热处理,并与未热处理涂层进行对比,利用SEM观察其表面和截面形貌,通过天然海水浸泡以及电化学阻抗的方法对其进行了腐蚀防护性能测试。结果表明,热处理后涂层中锌粉末的球形结构基本消失,均匀分布在在涂层中;开路电位稳定在-1200 m V(相对SCE)左右;对于热处理涂层,模拟电路中的电阻值在50~100 kΩ·cm2范围内浮动,电阻值扩大了一个数量级,明显比未热处理过的涂层电阻大,耐腐蚀性有所提高。
The nickel-based nickel-zinc-alumina composite coating was prepared on the surface of steel 45 by low-pressure cold spraying. The zinc-nickel composite coating was heat-treated at 20 ℃ above the melting point of zinc and compared with the non-heat-treated coating. SEM observation of its surface and cross-sectional morphology, through the natural seawater immersion and electrochemical impedance method of its corrosion protection performance test. The results show that the spherical structure of zinc powder in the coating disappears after heat treatment and is uniformly distributed in the coating. The open circuit potential is stable at about -1200 mV (relative to SCE). For the heat-treated coating, the resistance of the analog circuit is between 50 ~ 100 kΩ · cm2 range of floating, the resistance increased by an order of magnitude, significantly higher than the heat treatment of the coating resistance, corrosion resistance has improved.