How To Prevent The Surface Of Stainless Steel Pipe Fittings From Turning Black

Mm is a uniform and dense ferroferric oxide film that is firmly bonded to the metal matrix. The film is blue-black, so it is generally called bluing or blackening treatment. The blackening treatment of stainless steel sanitary pipe fittings is often used for process rust prevention or to increase the appearance quality. The process flow is fixture installation-chemical degreasing-cold water rinsing-pickling-cold water rinsing-oxidation treatment-cold water or warm water cleaning-boiling water rinsing-saponification-oil immersion-packing. Its bluing operation is generally divided into three stages.

Sanitary Valve the preparation stage is mainly to remove oil, rust, scale, salt residue, etc. on the surface of stainless steel pipes, and prepare for surface activation to form a high-quality oxide film, mainly including boiling, chemical degreasing, pickling and clamping of stainless steel pipes.

In the oxidation treatment stage of stainless steel sanitary pipe fittings, the prepared workpiece is placed in a blackening solution heated to a set temperature and stays for a certain period of time to form the required oxide film layer on the surface of the stainless steel pipe. Pay attention to adjusting the temperature of entering the tank and the temperature of leaving the tank. The auxiliary processing stage of stainless steel sanitary pipe fittings after oxidation is mainly filling treatment and oil immersion, the purpose of which is to further improve the resistance of the oxide film layer.