Material Selection for Spray Coating in Sheet Metal Fabrication
The quality of spray coating not only affects the product’s appearance but also directly impacts its durability and functionality. Therefore, when tackling challenging spray coating tasks, systematic planning and execution are required, encompassing multiple aspects, including material selection, process optimization, equipment configuration, and personnel skills.
Material Selection and Pretreatment
Sheet metal materials vary widely, including stainless steel, aluminum alloy, and galvanized sheet metal. The surface properties of each material significantly influence the spray coating’s effectiveness. Material pretreatment is particularly important in challenging spray coatings. The following are several key steps:
– Surface Cleaning：Before spraying, the surface must be thoroughly cleaned of oil, rust, and impurities. Chemical cleaning, mechanical polishing, or sandblasting can be used to ensure a clean, contamination-free surface.
– Surface Treatment: For certain materials, such as aluminum alloys, anodizing or chemical conversion treatment may be required to enhance coating adhesion.
– Rust Prevention: For materials prone to rust, phosphating or passivation treatment can be performed before spraying to improve the coating’s corrosion resistance.
