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1. Stainless steel Fitting -steel has good deterioration resistance and great cold and warm functioning performance, so it is commonly utilized to manufacture numerous type of get rid of anti-corrosion requirements. The passive movie externally of austenitic stainless steel has a great influence on its rust resistance. The passive movie of austenitic stainless steel is mostly gotten by pickling as well as passivation.
2. Formula
Pickling option: 20% nitric acid + 5% hydrofluoric acid + 75% water
Passivation solution: 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:
Get rid of the oxide coating by Shot blowing up.
Clean welding areas on both sides, eliminate oil as well as other stains on the surface with fuel or cleaning agent.
Heavy oil to be cleaned with 3-5% alkali washing remedy. After cleaning, clean up the surface with tidy water.
b. Pickling and passivation.
Pickling and also Bronze Casting (two in one) option can finish pickling and also passivation at one time. The temperature level and time will be strictly regulated. If the temperature is low, the moment will certainly be long, and also if the temperature level is high, the moment will certainly be short. Protect against matrix rust caused by failing to achieve pickling effect or extreme pickling. After therapy, it has to be extensively washed with clean water to make the surface area devoid of recurring fluid, so regarding promote subsequent passivation treatment.
Homepage: http://www.stone-industrial.com/INDUSTRIES/22.html
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