精密小孔在镀硬铬时，很难获得均匀的镀层，直接影响产品的尺寸精度和形位精度。
It is difficult to gain homogeneous coating when precision small holes are electroplated chrome, which affects the dimensional precision and the form precision of the product.
在不锈钢活塞杆完成电镀后，还需要对镀层的质量、尺寸等进行全方面的检查。
After the stainless steel piston rod is complete, it is necessary to inspect the quality and size of the coating.
结果表明，机械镀锌-铝镀层主要是由尺寸不等的锌粉颗粒相互参杂、填充，形成致密结构体；
The results show that the coating is mainly composed of zinc particles of different size intermixing and filling reciprocally, and therefore a dense structure is formed;
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