How to Pre-treat Surfaces for Plasma Spraying？

Jiangsu Yibai Precision Machinery Co., Ltd. specializes in various spraying technologies, including supersonic flame spraying, tungsten carbide spraying, plasma spraying, supersonic arc spraying, wire flame spraying, powder flame spraying, spray booths, automatic sandblasting booths, polishing, and grinding products. With extensive production experience, they meet diverse customer needs for different coatings. Now, let's explore how to pre-treat surfaces for plasma spraying. The surface pre-treatment for plasma spraying consists of three stages: surface pre-machining, surface cleaning, and surface roughening.

1. Surface Pre-machining

This stage involves preparing the workpiece surface for coating deposition and increasing the bonding area. Additionally, it helps to alleviate the shrinkage stress of the coating. Specific areas of the workpiece may undergo pre-machining to disperse local stresses in the coating and improve its shear resistance. Common methods include rounding corners and prefabricating coating grooves. Rough turning threads is also a frequently used method, especially for large workpieces.

2. Surface Cleaning

Methods such as solvent cleaning, alkaline cleaning, and heated degreasing are commonly used to remove surface contaminants and maintain cleanliness. Common cleaning solvents include gasoline, acetone, carbon tetrachloride, and trichloroethylene. Alkaline cleaning is often employed for large repair workpieces, typically using sodium hydroxide or sodium carbonate, which is a more economical approach.

3. Sandblasting Roughening Treatment

Sandblasting is an important pre-treatment method for thermal spraying. It creates a uniform, rough surface that facilitates the mechanical bonding of the coating. Clean compressed air drives clean sand particles to impact the workpiece surface, generating compressive stresses, removing surface oxide films, and causing some surface metal to undergo lattice distortion, which enhances the physical bond of the coating. After sandblasting, the metal substrate achieves a clean, rough, and highly active surface.

This overview provides insights into how to pre-treat surfaces for plasma spraying. We hope this information is helpful. Jiangsu Yibai Precision Machinery Co., Ltd. is dedicated to surface coating technology processing and thermal spraying production. With thermal spraying technology as its core business, the company continually expands into more coating fields. For inquiries, please feel free to contact us at: +86-158-51006550.