Before electroplating, the oil seal of the parts should be removed. Reason:

Before electroplating, the oil seal of the parts should be removed. Reason:

Dalian metal surface treatment: Before electroplating, the oil seal of the parts should be removed. After removing oil stains, the surface of the parts should be free of oil stains, oil stains, metal shavings, and paint marks from mechanical processing. Components connected by bolts are not allowed to be directly electroplated or chemically treated. Riveted parts, welded parts with gaps, and castings with excessive sand holes should not be electroplated or chemically treated in principle. Otherwise, corrosion may occur due to electrolyte flowing into the gaps; The surface of the workpiece after heat treatment should be cleaned, and there should be no incomplete oxide scale or residue (such as salt, alkali, molding sand, and sintered material caused by incomplete oil stains on the surface of the workpiece before heat treatment), and slight oxide scale and rust corrosion are allowed.

Most electroplating solutions are corrosive and stable in organic acids, which can maintain their luster for a long time. However, the following situations can cause corrosion of the plating layer and require attention and measures to be taken for protection. Avoid contact with substances such as salt, hydrochloric acid, and bitters. Because the coating is easily soluble in the above-mentioned substances, it is necessary to avoid contact with 84 disinfectant, bleach, toilet cleaner, and other substances. Pay attention to the method of wiping. Normally, only neutral engine oil such as sewing machine oil needs to be applied to the electroplating layer of motorcycle parts once a week.

Attention should be paid to using a soft cloth to clean the dust and dirt before applying oil on the surface treatment of Dalian metal; After driving on rainy days, clean the dirt with clean water first; Then wipe with a soft cloth dipped in engine oil. When wiping oil, do not touch the paint surface and tires to prevent the paint surface from becoming dull and the tires from aging. If there is water mist inside the instrument and other coatings, they should be dried with a hair dryer before wiping.

For wiping plastic plated parts, only a soft cloth dipped in water (warm water) can be used, not oil, as it will damage the coating of the plastic plated parts. After cleaning, immerse the electroless nickel plating layer in a dilute aqueous solution of chromic anhydride (CrO3, 1-10%) for a few minutes. After removal, cleaning, and drying, the corrosion resistance of the coating is improved. Some products' chromic acid solutions also contain additives such as film-forming agents and wetting agents. In addition to passivation, it also has a sealing and film-forming effect, so the effect of improving the anti discoloration and corrosion resistance of the electroless nickel plating layer is significant.

After extensive investigation, it was found that 70% of the unqualified products in Dalian's metal surface treatment electroplating are caused by incomplete degreasing, such as blistering, peeling, uneven coating color, flower like, foggy, missed plating, burrs, and decreased corrosion resistance, all of which are closely related to incomplete grease removal. Etching refers to acid washing. It requires the removal of rust and oxide film from the surface of the parts to be plated, in order to expose a clean surface of the base metal and facilitate the deposition of a metal coating with good adhesion. It is the second important process after degreasing in the electroplating process, which is related to the quality of electroplating.