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1. Introduction
Brass Casting
Austenitic stainless steel has good rust resistance and great cold and also warm working efficiency, so it is extensively utilized to make numerous kinds of parts with anti-corrosion requirements. The passive movie externally of austenitic stainless-steel has a wonderful influence on its corrosion resistance. The passive film of austenitic stainless-steel is mainly obtained by pickling and also passivation.
2. Formula
Pickling service: 20% nitric acid + 5% hydrofluoric acid + 75% water
Passivation solution: 5% nitric acid + 2% potassium dichromate + 93% water
Marinading passivation option (two in one): 20% nitric acid + 10% hydrofluoric acid + 70% water
3. Procedure
a. Pretreatment:
Eliminate the oxide covering by Shot blowing up.
Tidy welding places on both sides, get rid of oil and various other spots on the surface with fuel or cleaning agent.
Hefty oil to be cleaned with 3-5% alkali washing option. After washing, clean up the surface area with clean water.
b. Pickling and passivation.
Pickling and also passivation (two in one) solution can complete pickling and also passivation at once. The temperature and also time shall be strictly regulated. If the temperature level is low, the time will be long, as well as if the temperature is high, the moment will certainly be short. Prevent matrix corrosion caused by failure to accomplish pickling impact or extreme pickling. After treatment, it should be completely washed with tidy water to make the surface free of recurring fluid, so as to assist in succeeding passivation treatment.
Website: http://www.stone-industrial.com/WEOFFEREXPERTISE/6.html
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