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What are the reasons for the discoloration of the coating of precision automotive stamping parts?

The galvanized surface of precision stamping parts is a little bluish white, and the luster is not very bright. Play a decorative effect.
Zinc plating is to coat a layer of zinc metal with a thickness of several microns to ten microns on the surface of electroplated parts. It is an anodic coating for iron bases and has certain electrochemical protection. Galvanized parts have good rust resistance. Due to the electrochemical properties of zinc, it has a “sacrificial” protective effect on the steel substrate; while the corrosion product (basic zinc carbonate) of the zinc layer in the atmosphere is relatively dense, well attached and insoluble in water, and has a certain protection for the zinc layer. effect. Therefore, galvanizing is widely used to protect steel and its parts from atmospheric corrosion, especially suitable for mass production of precision metal stamping parts.The discoloration of precision automobile stamping parts has a certain relationship with the structure shape, the performance of the plating solution, and the running speed. In response to these factors, the editor will talk about the solution to the discoloration of the stamping parts coating. For the structural shape, this is a physical phenomenon, and it is impossible for us to change the structural shape of the workpiece for electroplating. Due to the characteristics of the current, we cannot change the current distribution in different parts of the workpiece during the electroplating process. We can ignore this reason. Regarding the speed of the workpiece, this is a better solution. As long as we adjust the speed regulator of the extraction machine on the electroplating line to the appropriate speed. In this way, the thickness of the coating reaches the standard and is evenly distributed, and the coating is not easy to change color. The performance of the plating solution is a key issue, and it is an important starting point for us to solve the discoloration of the workpiece. Therefore, when we choose the plating solution, we must test and compare repeatedly. Because the performance of the plating solution is transformed through a kind of open-type transformation, that is, the crystallization of metal ions on the precision metal stamping parts. The crystal is fine and the gap between the crystal nucleus and the crystal nucleus is small, so the protective ability of the coating is strong, that is, the anti-corrosion and anti-oxidation ability is strong, and the coating is not easy to change color. On the contrary, if the crystal is rough, the gap between the crystal nucleus and the crystal nucleus is large, and its protective ability is poor, and the coating is easy to change color. In this way, when we choose a plating solution, we must choose a plating solution with fine crystals to electroplate the workpiece.
Automotive Sheet Metal Fabrication

Pintejin Sheet Metal shop offers a cost-effective solution for a wide range of industries with our custom metal stamping and custom sheet metal fabrication capabilities. Our stampnig operations include a variety of sheet-metal forming manufacturing processes, such as punching, blanking, embossing, bending, flanging, and coining. Our professional, experienced and well-trained engineers can execute the complex metal stamping operations with precision and accuracy.

No matter what your metal fabrication needs are, Pintejin can offer the right solution: from single sheet metal part or sub-assembly of stamped metal parts to turnkey solutions for mechanical and electrical assemblies. We have the technology, equipment and the experience to fabricate customised metal products from aluminium sheet metal fabrication, steel, zinc plated steel, stainless steel sheet metal fabrication, brass and copper. Designs that require CNC machining of surfaces or components can be accommodated. We can supply polished, galvanized, zinc coated or powder coated finishes for any sheet metal work or stamped metal components. Coupled with our accurate and reliable metal fabricating equipment, we guarantee precision and repeatability in custom sheet metal work. You’ll be taking advantage of the best sheet metal fabrication china can produce.


With Pintejin automated and highly streamlined sheet metal fabrication service, you can expect a sheet metal fabrication quote within 12 hours and lead times as quickly as three days.Our rapid prototyping offering also includes a solid and reliable manufacturing capability (led by our expert team with 15+ years of experience) and technical and quality assurance, including SGS and RoHS material certifications, in-process quality reports, and First Article Inspection.



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