镀层(被复)螺紋的控制,目前还无統一的规定,几年来的实踐証明,这与生产类型及各厂的生产条件很有关系,鉴于鍍层螺紋的应用日益广泛,很有必要制訂出一个統一办法或标准来指导生产,現将本厂的实践情况介紹于下。鍍层螺絲的基本情况在电机、电器以及某些机器制造行业中,已广泛地使用了鍍层螺絲。按使用的要求,鍍层的种类很多,一般有鍍鎘、鉻、鋅、鎳、錫等。而螺絲本身的材料大都为钢、銅之类,由于鍍层种类的不同,所要求的电鍍工艺也不同,例如鋼螺絲鍍鋅可以直接鍍,而钢螺絲鍍鎳或铬,則应先鍍銅打底后再鍍最后表面要求的鍍层,有时 Currently, there is no uniform regulation. The practice over the past few years has proved that this is closely related to the type of production and the production conditions of each plant. Given the increasingly widespread application of coating threads, it is necessary to formulate A unified approach or standard to guide the production, now the factory’s practice is introduced below. The basic situation of coated screws In the motor, electrical appliances and some machinery manufacturing industry, has been widely used coated screws. According to the requirements of use, many types of coating, usually with cadmium plating, chromium, zinc, nickel, tin and so on. The material of the screw itself is mostly steel, copper and the like, due to different coating types, the plating process required is also different, for example, steel screw galvanized can be directly plated, while the steel screws nickel or chromium, you should first copper After plating the surface of the final coating required plating, and sometimes