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.
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。
Steel surface should be no visible oil, dirt, scale, rust and paint coating and other attached objects, the surface should be showed homogeneous metal color.
钢材表面应无可见的油脂、污垢、氧化皮、铁锈和油漆涂层等附着物，该表面应显示均匀的金属色泽。
For example, as for coated screw, the coating and the core metal are two homogeneous materials.
例如带有镀层的螺钉，镀层和内部金属为两种均质材料。
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