1) According to the processing requirements, some parts need to be polished, and the surface must not have processing burrs, etc.;
2) All parts are degreased;
3) The stainless steel ball valve is pickled and passivated after degreasing (the cleaning agent does not contain phosphorus);
4) Rinse with pure water after pickling and passivation, and there should be no chemical residue (this step is omitted for carbon steel parts);
5) Dry the parts one by one with a non-woven cloth, and do not leave the surface of the parts such as wire wool or dry with clean nitrogen;
6) Use non-woven fabric or precision filter paper dipped in analytical pure alcohol to wipe each part until there is no dirty color.
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