Email:jessy@jshengda.comWuxi Hengda Liquid-Purification Chemical Plant

Wuxi Hengda Liquid-Purification Chemical Plant

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Add:Nanyuan,Donggang Town,Xishan District,Wuxi City,Jiangsu,China



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Considerations When Pickling Stainless Steel Pickling Passivation Paste

1. the pretreatment of pickling and passivation
Stainless steel pickling passivation if there is dirt on the surface of the workpiece and so on, should be cleaned by mechanical and oil skimmed. If the pickling and passivation remove grease, surface oil will affect the quality of pickling and passivation, inter alia the oil skimmed cannot be omitted, alkali, emulsifying agent, can be used, such as organic solvents and steam.
2. the control of Cl-in acid solution and rinse water
Certain stainless steel pickling or pickling passivation paste by adding hydrochloric acid, perchloric acid, ferric chloride and sodium chloride containing chloride ions such as sulphate as main agents or additives remove the oxide layer on the surface, in addition to oils with chlorine-containing organic solvents such as trichloroethylene, preventing stress corrosion cracking is not appropriate. In addition, the preliminary rinse water as well as water, but on the final content of cleaning water requires strict control of the halides. Deionized water is often used. Such as Petro-chemical pressure vessel hydraulic test of austenitic stainless steel water control C1-content of not more than 25mg/L, such as unable to meet this requirement, may join the sodium nitrate in the water so that they meet the requirements, excessive levels of C1-, will destroy the passive film of stainless steel are pitting, crevice corrosion and stress corrosion cracking of root.

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