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1. Intro
Austenitic stainless-steel has excellent deterioration resistance and good cold as well as warm functioning performance, so it is extensively used to make numerous type of get rid of anti-corrosion requirements. The passive movie externally of austenitic stainless-steel has a great impact on its rust resistance. The passive film of austenitic stainless steel is mostly gotten by pickling and also passivation.
2. Formula
Marinading solution: 20% nitric acid + 5% hydrofluoric acid + 75% water
Pump Housing
Passivation option: 5% nitric acid + 2% potassium dichromate + 93% water
Marinading passivation service (two in one): 20% nitric acid + 10% hydrofluoric acid + 70% water
3. Operation
a. Pretreatment:
Get rid of the oxide coating by Shot blasting.
Tidy welding spots on both sides, eliminate oil and other discolorations externally with gasoline or cleaning agent.
Heavy oil to be cleaned up with 3-5% alkali washing option. After washing, cleanse the surface with tidy water.
b. Pickling as well as passivation.
Pickling as well as passivation (two in one) remedy can complete pickling and also passivation at one time. The temperature level and also time shall be purely controlled. If the temperature level is reduced, the time will be long, as well as if the temperature is high, the time will be short. Stop matrix deterioration caused by failing to achieve pickling effect or excessive pickling. After treatment, it has to be thoroughly washed with clean water to make the surface area without residual fluid, so regarding facilitate subsequent passivation therapy.
Read More: http://www.stone-industrial.com/INDUSTRIES/20.html
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