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Repair automobile parts by electroplating

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The damage of automobile parts mainly includes four types: deformation, fracture, corrosion and wear. The first three types of damage are usually repaired by cold working, hot working or gluing. If the general parts deformation can be cold-pressed or hot-pressed after correction for mechanical repair; shaft parts can be broken by inlaying, welding, forging and other methods to repair; cylinder block water jacket cracks can be repaired by welding, riveting or adhesive methods. Parts wear is the most common damage. Parts that have not worn out beyond the specified repair size are processed according to repair size. Parts that have worn out beyond the repair size are repaired by surfacing, spraying, electroplating and other metal covering processes and adhesive methods.

Electroplating Repair Method This method is to use the part to be repaired as the cathode, so that the metal cations in the electrolyte move toward the part (cathode) under the action of electric field force, and deposit on the surface of the part. The advantage of the electroplating method is that it can obtain a good wear resistant layer and no distortion of the parts. Chromium plating is often used to repair automobile parts, followed by iron plating chromium plating and iron plating are both electrode crystals, with similar ultra-fine grains and high dislocation structure and large internal stress, and is stratified, with a large number of microcracks. But the chromium plating layer and the iron plating layer have their own characteristics, such as high hardness, good wear resistance, and prolonging the service life of the parts. The disadvantages are low current efficiency, slow deposition, thin coating, high cost, and highly toxic chromium anhydride, serious environmental pollution. The electrolyte temperature of iron plating used to be above 90 C, which can reduce the internal stress of the coating and prevent peeling, but the hardness of the coating is on the low side. In 70s, the wear resistance and the bonding strength of the coating were increased by using low temperature iron plating at 45 C. Iron plating also has the advantages of fast accumulation, low cost and no pollution to the environment.

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