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1. Introduction
Austenitic stainless steel has good corrosion resistance and great cold and hot functioning efficiency, so it is commonly used to make various type of parts with anti-corrosion requirements. The passive movie externally of austenitic stainless-steel has an excellent influence on its corrosion resistance. The passive film of austenitic stainless steel is mostly acquired by pickling and passivation.
2. Formula
Marinading option: 20% nitric acid + 5% hydrofluoric acid + 75% water
Passivation option: 5% nitric acid + 2% potassium dichromate + 93% water
Marinading passivation solution (two in one): 20% nitric acid + 10% hydrofluoric acid + 70% water
3. Operation
a. Pretreatment:
Steel Press fitting
Eliminate the oxide finishing by Shot blowing up.
Clean welding spots on both sides, get rid of oil and also various other spots on the surface with gas or cleaning agent.
air blow gun
Hefty oil to be cleaned with 3-5% alkali cleaning remedy. After cleaning, clean the surface area with tidy water.
b. Pickling as well as passivation.
Pickling as well as passivation (2 in one) service can finish pickling as well as passivation at one time. The temperature and also time will be strictly managed. If the temperature level is reduced, the moment will be long, and also if the temperature is high, the time will be short. Stop matrix rust brought on by failure to accomplish pickling result or too much pickling. After therapy, it must be extensively washed with tidy water to make the surface area devoid of residual fluid, so as to promote succeeding passivation treatment.
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