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Driving preprocessing

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washing


Water washing after removing oil and rust is a supplementary process before painting, but it also needs enough attention. After removing oil and rust, some non-ionic surfactants and CL- can be attached to the surface of the workpiece. If these residual substances are not thoroughly cleaned, they may cause phosphating film to thin, produce linear defects, or even phosphating. Therefore, to improve the quality of water washing after removing oil and rust, it needs to be washed many times, two water washing, time 1-2min, and regular replacement of clean water to ensure the pH value of clear water between 5-7.
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