In the article “Surface Preparation for Best Adhesion for Powder Coating” by PF Online, a query regarding the surface preparation for cold-rolled 304 Stainless square tubing highlights the importance of proper surface treatment for effective powder coating. The tubing’s exposure to varying temperatures and environments necessitates a robust coating solution to ensure long-lasting protection and a professional finish.
For stainless steel surfaces like 304SST, achieving optimal adhesion requires meticulous surface preparation. A comprehensive process is recommended, starting with media blasting using aluminum oxide to remove oxidation and pits. Subsequently, a controlled alkaline degreasing step eliminates residual oils and contaminants, ensuring a clean surface for coating application.
A crucial step in the process involves passivation to remove iron-based residues and sulfides, which can lead to corrosion. Passivation typically entails immersing the part in a nitric acid bath, ensuring thorough treatment as per ASTM A380 standards.
After thorough drying, immediate powder coating of the passivated surface is recommended to preserve its integrity. High-quality powder coatings negate the need for primer coatings, enhancing efficiency and durability.
To meet durability requirements, it’s emphasized to apply the powder coating at a sufficient thickness, typically 3.0 to 4.0 mils for outdoor applications. Adequate curing temperature and time are essential to ensure the coating’s complete chemical bonding and durability.
Click here to learn more about Trans-ACC’s capabilities.
Article with all rights reserved, courtesy of pfonline.com
Photo with all rights reserved, courtesy of depositphotos.com