[ Method 1] Common solvents for degreasing: trichloroethylene, acetone, methyl ethyl ketone, ethyl acetate, and gasoline.
[
Method 2] After degreasing, it was immersed in the following solution at room temperature for 2-4 minutes : hydrochloric acid ( 37% ) 10-20 water   90-80 washed with warm water, washed with distilled water, at 66
-71 °C Dry for 30 min .
[
Method 3] in the following solution
38 ° C Immersed 3-6min: sulfuric acid (d-1.84) 2 1 Water 8 weight sodium chromium by cold water, distilled water, in 40 ° C Dry down.

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