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1. Introduction
Austenitic stainless steel has good deterioration resistance and great cold as well as hot functioning efficiency, so it is widely used to produce different type of get rid of anti-corrosion requirements. The passive movie externally of austenitic stainless-steel has a fantastic impact on its rust resistance. The passive film of austenitic stainless-steel is primarily gotten by pickling and also passivation.
2. Formula
Marinading remedy: 20% nitric acid + 5% hydrofluoric acid + 75% water
Passivation solution: 5% nitric acid + 2% potassium dichromate + 93% water
Marinading passivation remedy (2 in one): 20% nitric acid + 10% hydrofluoric acid + 70% water
3. Procedure
a. Pretreatment:
Get rid of the oxide coating by Shot blasting.
Clean welding spots on both sides, remove oil and various other stains on the surface with gas or cleaner.
Heavy oil to be cleansed with 3-5% alkali washing remedy. After cleaning, clean the surface area with clean water.
b. Pickling and also passivation.
Stainless steel Casting
Marinading and also passivation (two in one) remedy can complete pickling as well as passivation at once. The temperature and also time shall be strictly managed. If the temperature level is reduced, the time will certainly be long, and also if the temperature level is high, the moment will certainly be short. Prevent matrix rust brought on by failing to attain pickling impact or too much pickling. After treatment, it must be completely washed with tidy water to make the surface without residual liquid, so as to promote subsequent passivation treatment.
Website: http://www.stone-industrial.com/INDUSTRIES/25.html
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