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GSG-Tech is your trusted partner for high-performance sheet metal solutions. We specialize in advanced surface treatments that deliver exceptional corrosion resistance, superior aesthetics, and compliance with global standards—ensuring your parts stand out in reliability and precision.

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Core Surface Treatments

1. Powder Coating

Electrostatically applied and heat-cured, this versatile finish offers uniform scratch resistance and a wide spectrum of colors.

Key Advantages: Eco-friendly, cost-effective, and highly durable.

Ideal For: Automotive components, outdoor equipment, and electronic enclosures.

2. Anodizing

An electrochemical process creating a dense, protective oxide layer on aluminum (6061/7075).

Key Advantages: Wear-resistant, biocompatible, and customizable (matte, glossy, colored).

Ideal For: Medical devices, consumer electronics, and aerospace parts.

3. Electroplating

Electrolytic deposition of zinc, nickel, chrome , or tin for enhanced protection and conductivity.

Key Advantages: Superior corrosion resistance and decorative appeal.

Ideal For: Fasteners, hardware, and industrial components.

4. Mechanical Finishing

Sandblasting: Creates a matte finish and prepares surfaces for coatings.

Wire Drawing & Polishing: Achieves sleek, uniform textures or mirror-like finishes.

5. Passivation

A specialized stainless steel process removing free iron particles to prevent rust and maintain integrity.

Key Advantages: Non-toxic, compliant with medical & food-grade standards.

Ideal For: Surgical instruments, marine-grade components, and food processing equipment.

6. Specialized Treatments

Black Oxidation: Cost-effective corrosion protection for steel parts.

Electropolishing: Mirror-smooth finish for precision medical & electronic parts.

Alodine: Efficient chromate conversion coating for aluminum, ensuring superior adhesion and corrosion resistance.

Then, what are the differences between the sheet metal surface finishing process and the CNC surface finishing process?

Comparison Table of Sheet Metal Surface Finishing and CNC Machined Part Surface Finishing

Comparison Item	Sheet Metal Surface Finishing	CNC Machined Part Surface Finishing
Part Morphology Characteristics	Formed by bending, stamping and welding of thin plates, with thin walls, large area and easy deformation	Solid/thick-walled profiles formed by cutting, with complex structure, many edges and obvious tool marks
Original Surface State	The surface is relatively flat, but there are defects such as creases, welding spots, scratches and oil stains	There are obvious tool marks, steps and burrs, with large differences in local roughness
Key Points of Pretreatment	Degreasing, derusting, leveling, welding spot grinding and eliminating bending stress	Deburring, chamfering, removing tool marks and cleaning cutting fluid residues
Common Processing Technologies	Powder Coating, Electrophoresis, Wire Drawing, Ordinary Anodizing, Passivation, Electroplating, Painting	Polishing, Electrolytic Polishing, Hard Anodizing, Passivation, Blackening, Precision Electroplating
Impact on Tolerance	The coating is generally thick (50～150μm), which has a great impact on the assembly size	Most treatment films are thin (micron level), which is more friendly to precision tolerance and has minimal impact
Appearance Pursuit	Focus on large-area uniform color and unified texture, and pay attention to the overall visual beauty	Focus on local precision, mirror/smooth texture, and pay attention to the delicacy of details and the presentation of metal color
Anti-corrosion Focus	Focus on outdoor weather resistance, scratch resistance and impact resistance, suitable for long-term exposure environment	Focus on wear resistance, friction reduction, rust prevention and dimensional stability, suitable for precision moving parts
Typical Process Combination	Sandblasting → Powder Coating / Wire Drawing → Spraying / Aluminum Oxidation → Painting	Machining → Deburring → Sandblasting → Anodizing/Passivation → Electrolytic Polishing
Deformation Risk	High-temperature curing (powder coating/baking paint) is easy to cause warping and deformation of thin plates	The material is thick, and it is basically not easy to deform during heat treatment and surface treatment
Applicable Industry Scenarios	Chassis, Cabinet, Shell, Panel, Structural Parts, Outdoor Equipment	Precision Parts, Gears, Shafts, Molds, Medical Equipment, High-end Structural Parts

Why Choose GSG-Tech?

Uncompromising Quality ISO 9001-certified with tight tolerances (±0.05mm). We rigorously test coating thickness, adhesion, and corrosion to meet ISO 13485, FDA, and CE standards.

Material Mastery Expertise across aluminum, stainless steel, carbon steel, and engineering plastics (PEEK, PA12). We select the optimal treatment based on your specific material and performance needs.

End-to-End Efficiency From DFM consulting to global delivery, we streamline your workflow with pre-treatment, custom processing, post-treatment, and full traceability documentation.

Industry Expertise Serving medical, automotive, and electronics sectors with tailored solutions that exceed industry benchmarks.

Let’s Start Your Project

Elevate your sheet metal parts today. Contact our engineering team for a free consultation, quote, or sample request.

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Elevate Your Parts with GSG-Tech’s Premium Surface Treatments

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