In the comprehensive article “Surface Preparation for Best Adhesion for Powder Coating” from PFOnline, the crucial steps for achieving optimal adhesion and durability in powder coating applications are outlined.
A query regarding the use of cold-rolled 304 Stainless square tubing for instrument housings prompts the exploration of powder coating as a cost-effective means to provide a professional finish and prevent oxidation and pitting. However, adhesion challenges must be addressed to ensure long-term performance, especially in environments ranging from -40°C to +100°C, occasionally dusty, oily, and near sea water.
The recommended process for powder coating preparation begins with media blasting using aluminum oxide, followed by a thorough alkaline degreasing step to eliminate residual oils and contaminants. Passivation is then advised to remove iron-based residues and sulfides from the stainless surface, enhancing corrosion resistance.
It’s crucial to powder coat the passivated surface promptly to prevent degradation, with a high-quality powder coating obviating the need for a primer. Application thickness, typically 3.0 to 4.0 mils for outdoor use, and proper curing temperature and time are paramount for durability.
Click here to learn more about Architectural & Industrial Metal Finishing’s capabilities.
Article with all rights reserved, courtesy of pfonline.com
Photo with all rights reserved, courtesy of depositphotos.com
