零件的尺寸镀铬,是指在钢铁件上直接镀铬到规定尺寸,而不需再进行机械加工的一种镀铬方法。这种方法一般有两种情况:①是把已磨损的零件镀复到原来的尺寸;②是为了提高零件的耐磨性,镀前特意留出铬层的尺寸。由于铬层对钢铁件而言是属于阴极 The size of the parts chrome, refers to the steel pieces directly chrome to the specified size, without the need for further machining of a chrome-plated method. This method is generally two cases: ① is worn parts to restore the original size; ② is to improve the wear resistance of parts, plated before deliberately set the size of chromium layer. Since the chrome layer belongs to the cathode to the steel part