Metal Plating: Process, Type, and Applications - VMT

In CNC Machining manufacturing, poor surface durability and lackluster finishes can reduce the lifespan of precision parts. Customers expect components with perfect looks and robust performance. Metal plating offers a proven way to enhance both aesthetics and function.

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Metal plating is the process of coating a metal surface with a thin layer of another metal to improve appearance, corrosion resistance, conductivity, or wear resistance. The process involves cleaning the base material, depositing the coating, and performing post-treatment to achieve the desired finish.

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Let us explore in depth how plating metal works, the types available, the advantages and disadvantages, and why it is essential for precision CNC machining parts.

What Is Metal Plating?

Electroplating is a finishing process in which metal is deposited onto a surface, creating a thin coating on a metal substrate. This process, centuries old, remains essential to modern technology. This surface treatment offers numerous benefits, such as improving the appearance of CNC-machined parts, enhancing their corrosion resistance, and extending their service life. For manufacturers, it’s a critical step in ensuring high-quality, high-precision parts that meet customer specifications.

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Step-by-Step Metal Plating Process for CNC Machining Parts

The plating metal process is carried out in a series of carefully controlled stages to ensure strong adhesion, consistent coating thickness, and long-lasting performance. This structured approach is essential for producing a flawless finish on CNC machining parts that meet both functional and aesthetic requirements.

1. Surface Preparation

The base material is meticulously cleaned, degreased, and polished to eliminate any oils, dirt, or machining residues. This step creates an ideal surface profile that enhances the bond between the substrate and the plated layer.

2. Pre-treatment

Oxide layers are removed, and the surface is chemically activated. This improves molecular bonding between the base material and the coating, ensuring superior adhesion even under extreme operating conditions.

3. Plating

The coating is deposited using electroplating and metal finishers or advanced chemical deposition methods. The choice depends on factors such as required finish, coating thickness, and application-specific properties.

4. Post-treatment

The plated part undergoes thorough rinsing, controlled drying, and sealing. This step improves corrosion resistance, enhances wear performance, and protects the final appearance.

5. Inspection

Precision instruments measure coating thickness, verify adhesion strength, and check for any surface defects. Only parts that meet strict CNC machining tolerance and quality standards proceed to final packaging and delivery.