Tungsten carbide spraying is a common surface treatment process, primarily employing supersonic flame anti-corrosion and wear-resistant spraying. The process includes the following steps:
Surface Pretreatment:
Surface Cleaning: Using mechanical methods such as steel wool, supplemented with alkaline cleaning solutions, remove rust and oil stains from the pipe surface to achieve a cleanliness level of SA3, ensuring a strong adhesion base.
Surface Roughening: Sandblasting and electro-drawing are typically used to improve the mechanical bonding strength between the coating and the substrate, with a standard roughness of 6.5-25.
Spraying: After sandblasting and rust removal, the working surface should be sprayed promptly to prevent moisture and contamination.
Inspection: Check the coating thickness, missed areas, and uniformity.
Coating Sealing: Sealing is crucial for anti-corrosion coatings. A sealing agent with good penetration, high-temperature resistance, and corrosion resistance should be selected.
The resulting tungsten carbide sprayed coating exhibits extremely high hardness. Generally, tungsten carbide coatings can achieve a hardness of HV1200 or even higher. Their hardness depends on several factors:
Tungsten carbide content: The higher the tungsten carbide content in the coating, the higher the hardness usually is.
Spraying process: Different spraying processes affect the hardness of the coating. For example, processes such as supersonic flame spraying can achieve tungsten carbide coatings with higher hardness.
Post-treatment: Appropriate post-treatment, such as heat treatment, can improve the microstructure of the coating and increase its hardness.
The high hardness of tungsten carbide coatings makes them widely used in many fields, such as machinery manufacturing, petrochemicals, and aerospace. In these fields, tungsten carbide coatings can effectively improve the wear resistance, corrosion resistance, and fatigue resistance of parts, extending their service life.
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Post time: May-28-2026