对零部件进行涂层处理主要有三个目的:(一)以取得所需的光学效果,使零部件表面呈一定的颜色或具有一定的光泽;(二)防止周围介质的腐蚀,以延长其寿命;如电镀或涂料;(三)提高其质量,如对刀具进行表面处理。在世界上,因钢材生锈而造成的浪费是大得惊人的;仅在西德,每年就因此而损失5百到1千万吨钢。 There are three main purposes for coating the parts: (1) to obtain the required optical effect so that the surface of the part is of a certain color or has a certain gloss; (2) to prevent the corrosion of the surrounding medium so as to prolong its life ; Such as electroplating or coating; (C) to improve its quality, such as surface treatment tools. In the world, the wastage of steel due to rusting is staggering; in West Germany alone, 5 to 10 million tons of steel are lost every year.