What are the common pretreatment methods and equipment in coating lines?

In the coating industry, coating pretreatment is a key link to ensure the quality, adhesion and durability of the coating. The main purpose of pretreatment is to remove impurities such as grease, dirt, dust, etc. on the surface of the workpiece, and provide a clean base for subsequent rust removal and coating steps. This article will introduce the common pretreatment methods and pretreatment equipment in the coating line in detail.

Ⅰ. The importance of coating pretreatment

The quality of coating pretreatment is directly related to the adhesion and service life of the coating. Without high-quality pretreatment, even if a coating with excellent appearance is obtained, once it is affected by the outside world, the coating is prone to blistering, falling off, and even rusting from the inside out. Therefore, choosing a reasonable pretreatment method and doing a good job of pretreatment are the key to product coating.

Ⅱ. Common pretreatment methods and equipment

1. Anodizing line

Anodizing line is often used for surface treatment of aluminum and its alloy materials. The principle is to use aluminum products as cathodes, immerse electrolytes in anodes and apply direct current, so that the anode surface is oxidized to form an oxide film. This oxide film has the characteristics of high hardness, wear resistance, corrosion resistance and good insulation. It can form a protective layer on the surface of the workpiece and can be given various colors by dyeing. Anodizing lines are widely used in the coating production line of aluminum cookware pots.

2. Spray pretreatment

Spray pretreatment is a method of placing metal parts in a cleaning tank and spraying the cleaning liquid in the cleaning pipe onto the surface of the parts for cleaning through high-pressure spraying. It is suitable for many workpieces. This treatment method has a high degree of automation and can realize automatic control and data monitoring to improve cleaning efficiency and quality. By adjusting the parameters, different cleaning requirements can be met and the surface of metal parts can be cleaned quickly and effectively. Spray pretreatment is often used for degreasing, rust removal, and decontamination before metal surface treatment.

3. Immersion pretreatment

Immersion pretreatment is a surface treatment process that is often used to clean the surface of metal parts for further operations such as coating, pasting or welding. This treatment method is usually used to remove dirt, paint, fat and other unnecessary substances on the surface before electroplating, anodizing, machining and precision machining. Immersion pretreatment can effectively improve the quality and adhesion of surface treatment, and is an effective method for cleaning metal surfaces.

4. Desktop pretreatment

Benchtop pretreatment refers to a method of surface treatment of metal parts on a desktop device. This treatment method is usually suitable for small workpieces, such as non-stick pans and cake pans, with less manpower and time cost investment, low cost, and more convenient and quick operation process. Desktop pretreatment can effectively improve the surface adhesion and service life of parts, and can be customized, suitable for the treatment of various metal materials and surface requirements.

5. Gantry pretreatment

Gantry pretreatment is an automated surface treatment equipment, usually used for larger parts and large-scale production lines, such as car bumpers and hardware products. This equipment is controlled by a computer, and different treatment parameters and process flows can be set to achieve customized treatment and efficient production. Gantry pretreatment has high treatment effect and quality, and can be customized, which is suitable for industries and products with high requirements for surface treatment quality.

Ⅲ. Summary

Coating pretreatment is an indispensable part of the coating process, and its quality directly affects the adhesion of the coating and the service life of the product. Different pretreatment methods and equipment have their own characteristics and are suitable for different workpieces and process requirements. When choosing a pretreatment method, it is necessary to comprehensively consider the material, size, process requirements, cost budget and other aspects of the workpiece. Through reasonable pretreatment equipment, the quality of the coating can be ensured, and the service life and added value of the product can be improved. If you want to know more about the coating industry, you can consult Chuangzhi Coating, a coating solution provider with 30 years of experience!