Surface Treatment for Metal Casting

Surface treatments enhance the properties of metal castings, improving durability, hardness, and resistance to wear and corrosion. Here are key treatments used in the industry

Heat Treatment & Quenching

Heat treatment involves controlled heating and cooling to alter metal properties like strength and hardness. Quenching, a rapid cooling process that follows heating, locks the metal’s microstructure into a hard phase, significantly increasing hardness and strength. The choice of quenching medium (water, oil, or air) influences the final properties.

Carbonitriding & Gas-Carburizing

Carbonitriding introduces carbon and nitrogen into steel surfaces at 850-950°C, followed by quenching, enhancing surface hardness, wear resistance, and fatigue strength. Gas-carburizing diffuses carbon into low-carbon steel at 900-950°C, creating a hard exterior while maintaining a tough core, followed by quenching to achieve desired hardness.

Through Hardening & Tempering

Through hardening, or full hardening, involves heating and quenching to achieve uniform hardness throughout the metal, enhancing its strength and wear resistance. Tempering follows quenching and reduces brittleness by reheating the metal below its critical point and cooling it, improving toughness and ductility while maintaining hardness.

Stress-Relieving

Stress-relieving heats metal below its transformation range and cools it slowly to reduce internal stresses from machining or welding. This treatment enhances dimensional stability and reduces risks of distortion and cracking during further processing or in service.

Selecting the right surface treatment is crucial for optimizing metal casting performance. Each treatment offers specific benefits, and our expertise ensures we can provide tailored solutions to meet your project needs.

Surface Finishing Capabilities for Metal Casting

Surface finishing processes are crucial in metal casting to enhance the physical appearance, corrosion resistance, and overall quality of the final product. Here are the key surface finishing capabilities

Shot Blasting & Glass Bead Blasting

Shot blasting uses abrasive particles to clean and prepare surfaces, improving texture and adhesion for coatings. Glass bead blasting employs fine glass beads to achieve a smooth, satin finish, ideal for removing surface deposits without damaging the underlying metal.

Sand Blasting & Tumbling

Sand blasting involves propelling sand particles at high speed to clean, etch, or smooth the surface. Tumbling, also known as tumbling blasting, uses rotating barrels or vibrating machines filled with abrasive media to deburr, clean, and polish parts, enhancing surface quality and uniformity.

Vibratory Deburring & Liquid Painting

Vibratory deburring uses vibrations to cause abrasive media to rub against the metal parts, effectively removing sharp edges and surface imperfections. Liquid painting applies paint in liquid form to provide a protective and decorative coating, offering a wide range of colors and finishes.

Powder Coating & Red Oxide Coating

Powder coating involves applying dry powder electrostatically to the metal surface and then curing it under heat, resulting in a durable, high-quality finish. Red oxide coating provides a rust-resistant primer layer, commonly used as a base coat for additional paint layers.

Hot Dip Galvanizing & Zinc Plating

Hot dip galvanizing involves immersing the metal in molten zinc, forming a robust, corrosion-resistant coating. Zinc plating applies a thin zinc layer to the metal surface via electroplating, enhancing corrosion resistance and providing a shiny finish.

Acid Pickling & Passivation & Blackening

Acid pickling uses acids to remove impurities, oxides, and scale from metal surfaces, preparing them for further processing. Passivation involves treating stainless steel with an acid solution to remove free iron and enhance corrosion resistance. Blackening provides a black oxide coating, improving appearance and corrosion resistance.

Electropolishing & Passivation

Electropolishing is an electrochemical process that smooths and streamlines the metal surface, enhancing its appearance and corrosion resistance. Passivation, often performed after electropolishing, further removes any remaining contaminants, ensuring optimal corrosion resistance and surface quality.