目的：控制锌铬涂层前处理及涂覆工艺参数,实现锌铬涂层厚度均匀性的提高及零件尺寸精度控制。方法采用均匀设计法进行实验设计,对涂层制造工艺中的前处理和涂覆工艺参数进行优化,通过对喷丸、喷涂参数进行控制,改善锌铬涂层的质量。结果通过优化试验并经均匀设计软件计算,获得了膜层在不同黏度和抛甩速度下的等值图,根据等值图改进涂覆参数后,表面粗糙度Ra可达到1.6μm,膜层厚度精度达到±1.5μm。结论通过等值图选择合适的涂覆工艺,可有效控制锌铬涂层附着量,达到对涂层质量进行控制的目的。
Objective To improve the thickness uniformity of Zn-Cr coatings and to accurately control the machine element, the technological parameters of pretreatment and Zn-Cr coating process were studied. Methods The technological parameters of pre-treatment and Zn-Cr coating process were optimized by using the uniform design method. The quality of Zn-Cr coatings could be im-proved through the control of shot blasting and coating parameters. Results Through the optimization experiment and the calculation using the uniform design software, we achieved an isogram of the coating at different viscosity and spin-dry speed. Based on the i-sogram, we improved the plating parameters. The surface roughness Ra reached 1. 6 μm, and the thickness accuracy of coatings reached ±1. 5 μm. Conclusion By choosing the suitable coating process according to the isogram, we could efficiently control the adhesive amount of the Zn-Cr coatings and then control the quality of the Zn-Cr coatings.
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