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1. Introduction
Hot Forging
Austenitic stainless-steel has great rust resistance and great cold and also warm functioning performance, so it is extensively used to make various kinds of parts with anti-corrosion needs. The passive movie on the surface of austenitic stainless-steel has a wonderful influence on its deterioration resistance. The passive movie of austenitic stainless-steel is primarily gotten by pickling and passivation.
2. Formula
Marinading option: 20% nitric acid + 5% hydrofluoric acid + 75% water
Passivation solution: 5% nitric acid + 2% potassium dichromate + 93% water
Marinading passivation service (2 in one): 20% nitric acid + 10% hydrofluoric acid + 70% water
3. Procedure
a. Pretreatment:
Get rid of the oxide finishing by Shot blasting.
Tidy welding spots on both sides, remove oil as well as various other spots on the surface with gas or cleaning agent.
Hefty oil to be cleansed with 3-5% alkali washing service. After cleaning, clean up the surface with tidy water.
b. Pickling as well as passivation.
Pickling and also passivation (2 in one) option can finish pickling and passivation at one time. The temperature and time will be strictly managed. If the temperature level is low, the moment will be long, and also if the temperature is high, the time will certainly be short. Avoid matrix deterioration triggered by failing to achieve pickling impact or extreme pickling. After treatment, it has to be completely washed with clean water to make the surface area without recurring fluid, so regarding assist in subsequent passivation therapy.
Homepage: http://www.stone-industrial.com/WEOFFEREXPERTISE/5.html
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