Surface Treatment of CNC Machined Parts

1. Introduction

CNC machining is a precision manufacturing technology widely applied in aerospace, automotive, medical, electronics and other industries. Finished CNC parts usually require surface treatment to enhance appearance, corrosion resistance, wear resistance and practical performance. This article introduces common surface treatment methods for CNC components, along with their features and applicable scenarios.

2. Common Surface Treatment Processes

2.1 Anodizing

Applicable material: Aluminum alloyFeatures:

Improves corrosion resistance, ideal for aerospace and electronic products
Available in multiple colors such as black, silver and blue
Boosts surface hardness and wear resistance

Anodizing forms a dense oxide film on aluminum parts via electrolysis to upgrade anti-corrosion performance and decorative effect. It is classified into conventional thin-film anodizing and hard thick-film anodizing.

2.2 Plating

Applicable materials: Steel, stainless steel, copper, aluminum alloyFeatures:

Enhances anti-corrosion capability
Optimizes electrical conductivity (gold plating, silver plating)
Elevates decorative appearance

Plating deposits metals or alloys onto component surfaces. Common types include zinc plating, nickel plating, chrome plating, gold plating and silver plating. Chrome plating improves hardness and wear resistance; gold plating ensures conductivity and oxidation prevention; zinc plating strengthens rust protection.

2.3 Sandblasting

Applicable materials: Aluminum alloy, stainless steel, titanium alloyFeatures:

Creates uniform surface texture for better visual effect
Removes burrs, oxide layers and welding marks
Improves adhesion of subsequent coatings

Abrasive materials like alumina and glass beads are sprayed at high speed to form matte or textured surfaces. It serves as pre-treatment before painting and exterior beautification.

2.4 Polishing

Applicable materials: Stainless steel, aluminum alloy, brassFeatures:

Delivers high gloss and attractive appearance
Reduces surface roughness and friction coefficient
Strengthens corrosion resistance

Polishing lowers surface roughness through mechanical, chemical or electrochemical means. It is widely used for decorative parts including auto fittings, medical devices and high-end consumer electronics.

2.5 Chemical Oxidation

Applicable materials: Aluminum alloy, copper, stainless steelFeatures:

Generates uniform oxide film for better oxidation resistance
Suitable for precision parts with no external power required
Supports various finishes including black oxide

Black oxide treatment forms a dark protective film on steel components to prevent rust and reduce light reflection. Cost-effective and well-suited for mass production.

2.6 Powder Coating

Applicable materials: Aluminum alloy, steel, stainless steelFeatures:

Forms even and durable protective coatings
Diverse colors and surface textures available
Excellent chemical corrosion resistance

Powder materials are electrostatically attached to surfaces and solidified under high temperature to form tough protective layers. Commonly used for home appliances, auto parts and industrial equipment.

2.7 Nitriding

Applicable materials: Steel, stainless steel

Features:

Significantly raises surface hardness and wear resistance
Maintains stable component dimensions
Improves corrosion resistance

Nitrogen or ammonia penetrates metal surfaces under high temperature to form hard nitride layers. Suitable for heavy-load wear-resistant parts such as gears, molds and bearings.

3. Selection Guidelines for Surface Treatment

Choose processes according to materials and practical demands:

High corrosion resistance: Anodizing, plating, chemical oxidation
High hardness and wear resistance: Nitriding, hard anodizing, chrome plating
Superior appearance: Sandblasting, polishing, powder coating
Electrical conductivity: Gold plating, silver plating
Low friction performance: Nickel plating, nitriding

4. Conclusion

Surface treatment determines product outlook, performance, durability and service life. Proper process selection greatly improves part quality and market competitiveness. Manufacturers shall comprehensively evaluate material properties, cost, environmental impact and end usage to work out optimal treatment solutions.

About BRICS

BRICS specializes in custom mold manufacturing and precision machining. Our service scope covers CNC machining, injection molding, die casting and rapid prototyping. Equipped with advanced production facilities and rigorous quality management system, we provide diversified surface treatment solutions to guarantee premium product quality and performance.

Feel free to contact us for customized parts and surface treatment services. BRICS delivers efficient and reliable manufacturing support.

Surface Treatment of CNC Machined Parts

Surface Treatment of CNC Machined Parts

1. Introduction

2. Common Surface Treatment Processes

2.1 Anodizing

2.2 Plating

2.3 Sandblasting

2.4 Polishing

2.5 Chemical Oxidation

2.6 Powder Coating

2.7 Nitriding

3. Selection Guidelines for Surface Treatment

4. Conclusion

About BRICS

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