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1. Intro
Austenitic stainless-steel has great deterioration resistance and excellent cold and hot functioning efficiency, so it is commonly used to produce various kinds of get rid of anti-corrosion needs. The passive film externally of austenitic stainless steel has a great influence on its rust resistance. The passive film of austenitic stainless steel is mostly gotten by pickling and also passivation.
2. Formula
Marinading service: 20% nitric acid + 5% hydrofluoric acid + 75% water
Lost Wax Casting
Passivation remedy: 5% nitric acid + 2% potassium dichromate + 93% water
Pickling passivation remedy (two in one): 20% nitric acid + 10% hydrofluoric acid + 70% water
3. Operation
a. Pretreatment:
Eliminate the oxide finish by Shot blowing up.
Clean welding areas on both sides, get rid of oil as well as other stains externally with gasoline or cleaner.
Hefty oil to be cleansed with 3-5% alkali washing service. After cleaning, cleanse the surface with clean water.
b. Pickling and passivation.
Pickling as well as passivation (2 in one) remedy can complete pickling as well as passivation at once. The temperature as well as time will be purely controlled. If the temperature is low, the time will certainly be long, as well as if the temperature level is high, the time will be short. Prevent matrix rust caused by failing to achieve pickling effect or excessive pickling. After therapy, it needs to be completely cleaned with clean water to make the surface devoid of residual fluid, so as to help with succeeding passivation treatment.
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