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1. Intro
Austenitic stainless-steel has great corrosion resistance and also excellent cold and hot functioning performance, so it is widely made use of to produce various kinds of parts with anti-corrosion demands. The passive movie externally of austenitic stainless-steel has a terrific influence on its rust resistance. The passive film of austenitic stainless-steel is mostly gotten by pickling and also passivation.
2. Formula
Marinading remedy: 20% nitric acid + 5% hydrofluoric acid + 75% water
Passivation option: 5% nitric acid + 2% potassium dichromate + 93% water
Pickling passivation service (2 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 and other discolorations externally with fuel or cleaner.
Hefty oil to be cleaned with 3-5% alkali cleaning option. After washing, cleanse the surface area with clean water.
b. Pickling as well as passivation.
Pickling and passivation (2 in one) remedy can complete pickling and passivation at one time. The temperature level and also time will be purely managed. If the temperature is low, the time will be long, as well as if the temperature level is high, the moment will certainly be short. Protect against matrix deterioration caused by failing to achieve pickling effect or extreme pickling. After therapy, it should be extensively cleaned with clean water to make the surface area devoid of recurring fluid, so regarding help with succeeding passivation treatment.
Zinc Die Casting
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