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1. Intro
Austenitic stainless-steel has good rust resistance and great cold and hot functioning performance, so it is extensively utilized to make numerous type of get rid of anti-corrosion demands. The passive film externally of austenitic stainless-steel has a terrific impact on its rust resistance. The passive movie of austenitic stainless-steel is primarily acquired by pickling and passivation.
2. Formula
Pickling option: 20% nitric acid + 5% hydrofluoric acid + 75% water
Passivation solution: 5% nitric acid + 2% potassium dichromate + 93% water
Pickling passivation service (two in one): 20% nitric acid + 10% hydrofluoric acid + 70% water
3. Procedure
a. Pretreatment:
Eliminate the oxide covering by Shot blasting.
Tidy welding areas on both sides, get rid of oil as well as various other spots externally with gasoline or cleaning agent.
Heavy oil to be cleaned with 3-5% alkali cleaning solution. After washing, clean the surface area with clean water.
b. Pickling as well as passivation.
Marinading and also passivation (two in one) option can complete pickling as well as passivation at one time. The temperature and also time shall be strictly managed. If the temperature is low, the moment will certainly be long, as well as if the temperature level is high, the time will be short. Protect against matrix rust triggered by failing to achieve pickling effect or excessive pickling. After Aluminum Die Casting , it must be extensively cleaned with tidy water to make the surface area without recurring liquid, so as to promote succeeding passivation treatment.
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