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1. Intro
Austenitic stainless steel has good corrosion resistance and good cold and also warm working efficiency, so it is widely made use of to manufacture different kinds of get rid of anti-corrosion demands. The passive film on the surface of austenitic stainless steel has a terrific impact on its deterioration resistance. The passive film of austenitic stainless steel is generally acquired by pickling as well as passivation.
2. Formula
Pickling service: 20% nitric acid + 5% hydrofluoric acid + 75% water
Passivation remedy: 5% nitric acid + 2% potassium dichromate + 93% water
Marinading passivation service (2 in one): 20% nitric acid + 10% hydrofluoric acid + 70% water
3. Procedure
a. Pretreatment:
Remove the oxide finish by Shot blasting.
Tidy welding areas on both sides, get rid of oil and other spots externally with fuel or cleaner.
Heavy oil to be cleaned with 3-5% alkali cleaning option. After washing, clean the surface area with tidy water.
b. Pickling and also Aluminum Forging .
Marinading as well as passivation (2 in one) service can finish pickling and also passivation at one time. The temperature and time shall be purely regulated. If the temperature level is low, the moment will be long, and also if the temperature level is high, the time will be short. Stop matrix rust triggered by failure to accomplish pickling result or too much pickling. After treatment, it should be extensively washed with tidy water to make the surface devoid of residual fluid, so regarding assist in succeeding passivation therapy.
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