Rearview Mirror Robot Automated Spraying System

1. The purpose of pre-processing: Before spraying aluminum alloy profiles and sheets, the workpiece surfaces must undergo degreasing, cleaning, and chemical treatment to form a chromate film. This process enhances the adhesion between the coating and the metal surface, as well as improves its resistance to oxidation, ultimately helping to extend the service life of the paint film. 
2. Primer Coating: As a primer coating applied to sealed substrates, its function is to enhance the coating's resistance to permeation, strengthen protection of the substrate, stabilize the metal surface layer, and improve adhesion between the topcoat and the metal surface. This ensures uniform color in the topcoat application, with typical coating thickness ranging from 5 to 10 micrometers. 
3. Topcoat Application: The topcoat is a critical layer in the coating system, providing the decorative color required for aluminum materials, ensuring the aluminum’s appearance meets design specifications, and protecting the metal surface from erosion caused by external environmental factors such as atmospheric conditions, acid rain, and pollution—as well as preventing UV radiation from penetrating. This significantly enhances the material’s resistance to aging. The topcoat itself is a relatively thick layer of paint, typically ranging from 23 to 30 microns in thickness. 
4. Clear Coat Finish: A clear coat, also known as a varnish coating, is primarily designed to more effectively enhance the paint layer's resistance to external environmental factors, protecting the topcoat while boosting the metallic sheen of its color. This results in a more vibrant and dazzling appearance. Typically, the coating thickness ranges from 5 to 10 micrometers. 
The total thickness of the three-layer coating typically ranges from 40 to 60 micrometers, but can be increased for special requirements. 
5. Solidification Treatment: Typically, a three-coat coating requires secondary curing. The aluminum material is sent into a curing oven for processing, where the curing temperature usually ranges between 180°C and 250°C, and the curing time lasts 15 to 25 minutes. Different fluorocarbon coating manufacturers will provide optimal temperature and time settings tailored specifically to their own coatings. Meanwhile, some chlorocarbon spray coating facilities (also known as oil-baking plants) have even adjusted their processes—based on their own experience—to combine the two curing steps of the three-coat application into a single curing cycle. 
6. Quality Inspection: Quality inspection should be conducted according to the AAMA-605.02.90 standard. Only rigorous quality checks can ensure high-quality coated products.