Reasons for the yellowing of the coating of precision stamping parts

Precision has been committed to producing customized various precision stamping parts, drawing parts, metal insert injection parts for more than 10 years. Our company has hundreds of stamping, injection, and automated production equipment, with a daily production capacity of 20 million products, which can meet the product needs of different customers. Electroplating is a common surface treatment method for precision stamping parts, but electroplated products will also have some problems with electroplating yellowing. Next, let's look at what causes the yellowing of precision stamping parts. The residual liquid medicine and antiseptic inside the precision stamping parts spit out, and the tin layer adhered to the electroplating process is very easy to be eroded by this chemical substance. Cause the surface air to oxidize, causing the coating to turn yellow. Insufficient post-treatment process and no air-drying of the product will also cause the coating to turn yellow. Adhesion of tetravalent tin, excessive preservatives, environmental pollution of zinc residue in the plating bath (the probability is small), insufficient coating thickness, environmental pollution of iron residue (the situation is not easy to detect in the whole process of the electroplating process), storage Natural environment. This is all due to the yellowing of the coating of precision stamping parts. [Related recommendation] Learn more: What are the methods for polishing the surface of stainless steel? Learn more: Manufacturing characteristics of automobile stamping parts molds Learn more: Points to note in the design of continuous stamping dies (2)