Surface Treatment In Mechanical Processing: Technology, Advantages & Applications

Metal surface treatment with advanced technology at CNCTech. Enhance durability, reduce friction, and protect metals. Meet all precise mechanical processing needs.

1. What is Surface Treatment? Why is it important in mechanical processing?

Surface treatment is the process of enhancing the physical, chemical, and aesthetic properties of metal or alloy products. This method helps:

Increase durability, resist corrosion, and reduce friction.
Improve aesthetics, making products more polished and visually appealing.
Extend lifespan and reduce wear and tear during use.

At CNCTech Manufacturing, we provide professional surface treatment solutions that meet stringent requirements in precision machining, automotive, electronics, aerospace, and industrial manufacturing.

2. Common surface treatment method

2.1. Mechanical Surface Treatment of Metals

Using Heat
- Heat-generating devices (e.g., oxy-acetylene) are employed to remove old paint, grease, coatings, or dirt from the surface. However, this method is less effective for rust removal and may cause metal deformation due to heat exposure.

Using Sanding Disc Machines
- Sanding disc machines, equipped with abrasive discs, are ideal for treating corners and specific areas on metal surfaces that require cleaning.

Using High-Pressure Water Jets
- Operating at a pressure of around 1900 bar, high-pressure water jets can quickly and safely remove old paint, rust, or dirt. However, these machines are costly, and untreated areas are prone to oxidation.

Wet Sandblasting
- This environmentally friendly method is effective for cleaning large surfaces quickly. It removes thick rust and old paint layers using a mixture of sand and water sprayed at high pressure.

Dry Sandblasting
- Dry sandblasting guns eject small particles (0.3–1.5 mm) of sand, gravel, or stone at high speed to effectively clean metal surfaces. While efficient, this method can cause environmental pollution.

2.2. Electrochemical Surface Treatment of Metals

Electrochemical Methods
- This technique uses degreasing chemicals and electric currents to treat metal surfaces before painting. It is particularly suitable for small, detailed surfaces requiring high precision.

Chemical Treatment
- Stains, dust, rust, and mold are effectively removed using chemicals such as forming agents, organic solvents, powdered or liquid alkaline degreasers, catalysts, and alkaline solutions.

Ultrasonic Treatment
- High-frequency ultrasonic waves are highly effective for quickly cleaning edges, surfaces, and intricate details of metal objects.

Laser Technology
- Laser technology is widely applied in shipbuilding, automotive, aerospace, rubber, and electronics industries. Intense laser pulses (up to 1/1000s in speed) are directed at the surface to remove organic residues, old paint, oil deposits, and dirt. This method is efficient for cleaning surfaces and metal welds.

Ball Burnishing
- Ball burnishing is suitable for narrow and small surfaces. There are two main techniques: wet and dry ball burnishing.

Vacuum Coating
- Vacuum coating (PVD) is a superior surface treatment method compared to traditional techniques. The process occurs in a vacuum environment, ensuring no impurities or air interference. Coating materials transition from solid to vapor and back to solid, forming a thin, uniform layer. This method is durable, aesthetically pleasing, and environmentally friendly.

2.3. Other Surface Treatment Methods

Anodization (Anodic Oxidation)
- Anodization, or anodic oxidation, is commonly used for lightweight metals like titanium and aluminum. This method not only cleans the surface but also adds color to aluminum. It works through efficient electrolysis to create corrosion-resistant oxide films.

Painting
- Painting metal surfaces enhances aesthetics and improves corrosion resistance. Common techniques include spraying, dipping, brushing, powder coating, and electrostatic painting. The choice of paint formula depends on environmental conditions.

Hot Dipping
- Hot dipping involves immersing metal objects in molten tin, lead, zinc, aluminum, or solder to form a corrosion-resistant coating. It is widely applied for roadside guardrails and other exposed structures.

Thermal Spraying
- Thermal spraying applies molten solid materials onto the product surface to form a protective layer. Materials such as metals, alloys, plastics, composites, and ceramic powders (in wire, rod, or powder forms) are melted using plasma, electric arc, or other high-energy sources. The molten material is atomized into mist and adheres to the surface under high velocity.

3. Why choose surface treatment services at CNCTech?

Advanced technology: State-of-the-art machinery, meeting international standards.
Exceptional quality: Products with high durability and excellent corrosion resistance.
Experienced professionals: A team of skilled experts in surface treatment.
Strict quality control: Ensuring top-notch product quality before delivery.
Flexible solutions tailored to your needs: Meeting every surface treatment requirement.
High capacity: 450 tons for anodizing and 1,000 tons for powder coating annually.
Compliance with FDA and RoHS standards: Guaranteeing safety and environmental friendliness.