As a core process for product surface treatment, metal and plastic coating integrates material science and engineering technology. Its core lies in achieving tight bonding between the coating and the substrate through scientific technical means, balancing appearance texture and practical performance, and it is widely used in various fields of industrial manufacturing. Mastering its core technology is the key to ensuring coating quality and enhancing product competitiveness. 

Metal and plastic coating is a key process to improve the appearance texture of products and extend their service life, which is widely used in home appliances, automobiles, hardware and many other fields. Although the spraying process seems simple, it actually contains many details. A little carelessness may lead to problems such as paint peeling, bubbles and color difference, affecting product quality. To do a good job in metal and plastic coating, the following core points must not be ignored.

Electroplating, spraying, and phosphating are the three most commonly used processes in the field of metal surface treatment. Each of the three has distinct core functions—electroplating excels in protection and wear resistance, spraying is superior in aesthetics and wide adaptability, and phosphating is mostly used as an auxiliary pretreatment. The selection should be comprehensively judged based on material characteristics, service environment, performance requirements, and cost budget. The following is a detailed comparison and selection guide.

Auto parts are exposed to outdoor environments with intense sunlight, rain, and sudden temperature changes for long periods, while also needing to maintain the consistent appearance of the entire vehicle. Metal-plastic coating, with its dual advantages of "enhancing weather resistance and aesthetics", has become an indispensable key process in automobile manufacturing, providing comprehensive protection for various parts such as interior and exterior trims, and chassis components.

Dalian metal surface treatment, cadmium coating has good corrosion resistance, especially in marine atmospheric environments, with better corrosion resistance than other surface treatments. The waste liquid treatment cost in the process of electroplating cadmium is high, so it is not used in general industries and is only used in certain specific environments, such as fasteners for oil drilling platforms and Hainan Airlines aircraft.

Dalian surface heat treatment can significantly improve the fatigue strength of workpieces:

Dalian surface heat treatment can significantly improve the fatigue strength of workpieces. For example, the automotive half shaft made of 40MnB steel was originally quenched and tempered as a whole, but was changed to quenched and tempered+surface heat treatment, which increased its lifespan by nearly 20 times. In addition, surface heat treatment reduced the sensitivity of the parts to notches. The size of the outer panel mold is generally larger,