Blackening is also called blue, screw in air, water vapor or chemical solution at room temperature or heated to the appropriate temperature, on the surface of the screw to form a layer of blue or black oxide film, to improve its corrosion resistance and appearance of the surface treatment process. In mechanical manufacturing, NaOH solution heating is commonly used to blacken the screws. Compared with zinc plating and chromium plating, the cost is lower and the effect is also ok. Black oxide film formed by blackening, its thickness is 0.5-1.5μm, corrosion resistance is lower than other chemical films. General customers in order to choose a lower price of surface treatment, will choose oxidation blackening. Generally used in carbon steel and stainless steel. The significance of carbon steel is to enhance the corrosion resistance of the product itself, stainless steel blackening is mainly used with the product to achieve beautiful results.
Suzhou Anzhikou Hardware Technology Co., LTD., AS A screw manufacturer WITH 20 years of experience in production and customization, can do different surface electroplating treatment according to customer requirements, looking forward to cooperating with you.





