高速电镀锌工艺对镀层粗糙度及微观形貌的影响

Influence of technology of high-speed galvanization on roughness and micromorphology of coating

利用自制的模拟重力高速电镀槽, 考察了在硫酸盐镀锌过程中, 阴极电流密度、镀液流速、镀层厚度 3个主要电镀工艺参数对所得锌层的粗糙度的影响。结果发现: 镀层的粗糙度随电流密度(30~70 A/dm2)的增加呈现先下降后增加的趋势, 随镀液流速(0.8~2.0 m/s)的增加而单调下降, 随镀层厚度(20~90 g/m2)的增加而单调增加。在对这些数据进行分析的基础上, 讨论了这 3 组数据之间的关系, 解释了其对粗糙度影响的原因。同时考察了这些参数对镀层微观形貌的影响, 发现镀层的微观形貌也显著地受这些参数的影响。

Simulation gravity high-speed plating bath was used to study the technology of high-speed galvanization.The influence of three chief process parameters on the surface roughness was evaluated.These parameters include cathode current density, flow velocity of plating solution and thickness of galvanization coating.It is found that the surface roughness initially decreases and then increases with the increasing of current density(3070A/dm^2); and decreases constantly as the flow velocity(0.82.0m/s) of plating solution increases; however it increases monotonously along with the thickness of the galvanization coating(2090g/m^2). On the basis of analysis of the data and figures, the relationship among the parameters was discussed, and the reason for influencing the roughness was illustrated. And the influence of three parameters on the micromorphology of coating was studied. It is found that the parameters have a great influence on the micromorphology of galvanization coating.