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1. Introduction
Stainless steel Forging
Austenitic stainless steel has good corrosion resistance and also good cold and also hot working efficiency, so it is commonly made use of to manufacture various kinds of get rid of anti-corrosion needs. The passive movie externally of austenitic stainless steel has a terrific impact on its deterioration resistance. The passive movie of austenitic stainless steel is primarily obtained by pickling and also passivation.
2. Formula
Brass Casting
Marinading service: 20% nitric acid + 5% hydrofluoric acid + 75% water
Passivation option: 5% nitric acid + 2% potassium dichromate + 93% water
Hose Fitting
Pickling passivation option (2 in one): 20% nitric acid + 10% hydrofluoric acid + 70% water
3. Procedure
a. Pretreatment:
Remove the oxide finish by Shot blowing up.
Clean welding spots on both sides, remove oil as well as various other stains on the surface with fuel or cleaner.
Heavy oil to be cleansed with 3-5% alkali cleaning remedy. After washing, clean up the surface area with tidy water.
b. Pickling as well as passivation.
Marinading and also passivation (two in one) option can complete pickling and passivation at one time. The temperature and time shall be strictly managed. If the temperature is low, the moment will certainly be long, as well as if the temperature is high, the moment will be short. Avoid matrix corrosion brought on by failing to accomplish pickling result or extreme pickling. After treatment, it must be extensively cleaned with tidy water to make the surface free of residual liquid, so regarding assist in subsequent passivation therapy.
Website: http://www.stone-industrial.com/WEOFFEREXPERTISE/6.html
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