Coating technology and process of auto parts coating equipment

Automobile painting process can generally be divided into two parts: one is the surface treatment of metal before painting, also called pretreatment technology; the other is the construction process of painting. Surface treatment mainly includes the removal of oil stains, dust, rust on the surface of the workpiece, and the removal of the old paint layer during repair operations, so as to improve the surface condition of the workpiece. Including mechanical processing and chemical treatment of the surface of the workpiece according to various specific conditions, such as phosphating, oxidation and passivation treatment.

The anti-rust coating process of construction machinery can generally be divided into the surface treatment process before coating and the anti-rust primer coating process.

Surface treatment is one of the important processes of anti-rust coating. The quality of the anti-rust coating of construction machinery depends to a large extent on the quality of the surface treatment. According to the British Empire Chemical Company, the coating life is restricted by three factors: surface treatment, accounting for 60%; painting construction, accounting for 25%; the quality of the coating itself, accounting for 15%. Construction machinery industry, the surface treatment methods of different parts. Mechanical cleaning can effectively remove rust, welding slag, and oxide scale on the workpiece, eliminate welding stress, increase the bonding force of the anti-rust coating and the metal substrate, thereby greatly improving the anti-rust quality of construction machinery parts. The mechanical cleaning standard requires Sa2.5 level. The surface roughness should reach 1 /3 of the thickness of the anti-rust coating. The steel shot used for spraying and shot blasting must meet the requirements of GB6484. The surface treatment of sheet metal stamping parts is generally referred to as chemical surface treatment.

The process flow is: pre-degreasing → degreasing → hot water washing → cold water washing → pickling → cold water washing → neutralization → cold water washing → surface adjustment → phosphating → cold water washing → hot water washing → pure water washing → drying

The above process can also be adjusted appropriately according to the oil and rust conditions of the sheet stamping parts, or without the pickling process, or without the pre-degreasing process. While degreasing and phosphating are key processes in the chemical treatment process, these two processes directly affect the quality of the chemical treatment of the workpiece and the quality of the anti-rust coating. Relevant process parameters and related auxiliary equipment are also factors that cannot be ignored that affect the quality of surface treatment.

Automobile coating equipment includes complete sets of automatic and manual electrostatic spraying equipment: pass-through spray and dipping pretreatment device; water curtain spray booth; water spin spray booth; electric heating, oil, gas, coal, steam hot air drying and drying tunnel And drying box; suspended conveying, ground conveying equipment; PC electric control system, etc.