锌-碳化硅复合镀层的制备及性能

以钢板为基体,在普通氯化物镀锌液中加入碳化硅制得Zn-SiC 复合镀层。研究了电流密度、温度以及 SiC、氯化铵的质量浓度对镀层耐蚀性和显微硬度的影响,得到制备 Zn-SiC 复合镀层的较佳工艺条件:电流密度 0.5～1.0 A/dm2,温度 20～25℃,SiC 10～11 g/L,氯化铵 250～260 g/L。在较佳工艺下,Zn-SiC 复合镀层中 SiC 的质量分数为 0.75%,耐蚀性优于纯锌镀层,镀层中 SiC 的存在有利于生成晶粒细小、致密且显微硬度较高的镀层。

Preparation and performance of zinc-silicon carbide composite coating

A Zn-SiC composite coating was prepared on steel sheet by adding silicon carbide to the general chloride zinc plating bath. The effects of current density, temperature, as well as mass concentrations of SiC and NH 4 Cl on the corrosion resistance and microhardness of the composite coating were studied. The optimized process conditions for preparation of Zn-SiC composite coating are as follows: SiC 10-11 g/L, NH 4 Cl 250-260 g/L, temperature 20-25℃, and current density 0.5-1.0 A/dm 2 . Under the optimized process conditions, the Zn-SiC composite coating obtained contains 0.75wt% SiC and has better corrosion resistance than pure zinc coating. The existence of SiC in coating is good for forming the coatings with fine crystal grain, compact structure, and high microhardness.