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I, Prevention of oxide film

① Strengthen solution maintenance. Prevent harmful organic and inorganic impurities from invading, reduce their co precipitation with tin, thereby ensuring the purity of tin in the coating and slowing down the rate of tin discoloration.

② Strengthen post plating treatment. After plating, it is necessary to thoroughly rinse with cold and hot water, clean the decomposition products of organic brighteners adsorbed on the surface of the workpiece as much as possible, and dry them immediately.

③ Sealed storage. After thorough drying, it should be immediately stored in a sealed dryer to effectively prevent the pollution of harmful gases in the atmosphere.

II, Cleaning and removal of discolored coatings

① Soak in tap water for 2 minutes. Small items should be prevented from sticking.

② Removal of oxide film in dilute hydrochloric acid:

Small items should not be pasted.

③ Rinse with running water. Small items should be prevented from sticking.

④ Neutrality:

Small items should be prevented from sticking.

⑤ Rinse with running water. Small items should be prevented from sticking.

⑥ Rinse with deionized water and prevent small parts from sticking.

⑦ Blow dry.

⑧ Drying: