Introduce the metal surface treatment during the painting process in Dalian:

Introduce the metal surface treatment during the painting process in Dalian:

For metal castings, the commonly used surface treatment methods include mechanical grinding, chemical treatment, surface heat treatment, surface coating, and surface treatment involves cleaning the workpiece surface, removing burrs, oil stains, and oxide scales. The surface treatment of metals is also important in the painting process, which is related to the quality and effect of the painting. Next, I will provide a detailed introduction to the metal surface treatment during the painting process.

1. The importance of pre-treatment before metal spraying. There are many factors that affect the performance of metal anti-corrosion coatings, such as coating composition, coating form, basic surface pretreatment, coating structure, coating method, coating quality monitoring, and post coating treatment. The general reasons for failure are improper selection of coating system, which accounts for 20%. Poor basic surface treatment accounts for 40%. Insufficient or uneven coating thickness accounts for 20%. Unreasonable coating management and process account for 20%. This shows the importance of metal surface treatment.

 

2. Purpose of metal substrate pretreatment. (1) Enhance the bonding strength (adhesion) between the coating (coating film) and the metal surface of the coated object. Pre treatment methods include mechanical roughening, chemical reaction film formation, chemical (physical) adsorption, preparation and combination effect of transition layer, etc. (2) Improve the protective performance of the coating on the substrate, such as coating on galvanized steel parts. (3) Create good conditions for the flatness (fullness) of the coating, improve the appearance and decorative properties of the coating, such as putty, etc.

3. Pre treatment content for metal spraying.

Pre coating treatment of metal surfaces in Dalian.

(1.) Structural processing. Sharp corners, splashes, welding slag, welding holes, etc. Chamfering treatment reduces stress concentration.

(2.) Clean the surface. Oxidation scale (rolling), rust, soluble salts, grease, insoluble solids, moisture (excluding water-based coatings), etc.

(3.) Surface roughness. Improve roughness and enhance the mechanical interlocking between the coating and the substrate. Excessive roughness and raised areas may cause local coating thinning, leaving bubbles in pits and premature coating failure. Generally speaking, the recommended roughness control is 1/10 of the coating thickness.