Architectural & Industrial Metal Finishing: Elevating Protection Approach to Surface Preparation for Powder Coating

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.

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Article with all rights reserved, courtesy of pfonline.com

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