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.

Dalian metal plastic spray paint contains a lot of harmful chemicals such as formaldehyde and benzene, which can easily induce leukemia. Its harm to the human body has the characteristics of long-term, latent, and hidden, so it is easily overlooked by people. The harm of spray painting is greater. Spray painting takes longer than paint mixing, and paint mixing is only a process of adjusting the physical parameters of the paint solution during the use of the coating according to the needs. Usually, a diluent (also known as a solvent or thinner) is used to adjust the viscosity of the paint solution.

Air spraying is the process of using compressed air to spray out from the center hole of an air cap, creating a negative pressure zone in front of the paint nozzle. This causes the paint in the paint container to be sprayed out from the paint nozzle and immediately enter a high-speed compressed air flow. 

The air discharged by a regular fuel injection air compressor cannot be directly used by pneumatic devices. The air compressor sucks in air containing moisture and dust from the atmosphere, and after compression, the temperature of the air increases to about 140 ℃~170 ℃. At this time, some of the lubricating oil in the air compressor also becomes gaseous. In this way, the compressed air discharged by the air compressor is a high-temperature gas containing oil, moisture, and dust.

Dalian metal and plastic coating requires equipment operators to be proficient in the construction, performance, operation, and maintenance methods of various machinery, and to ensure dedicated personnel use and responsibility. Before the machinery starts working, it must be tested and all components must operate normally before it can start working. 

According to the painting production process, painting exhaust gas mainly comes from pre-treatment, spraying, and drying processes.