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🔹 What is Zinc Plating?

Zinc plating is a process of applying a thin layer of zinc metal onto the surface of a ferrous (iron or steel) component. This is done to protect the base metal from corrosion and oxidation, and to improve its appearance.

🔵 Blue Zinc Plating

1. Overview

  • Also known as clear zinc or blue-white zinc plating.

  • After zinc is plated, a clear or bluish passivation layer is applied.

  • Provides moderate corrosion resistance and a bright, shiny finish.

2. Applications

  • Widely used for automotive, hardware, and fasteners.

  • Offers a clean, aesthetic look and is cost-effective.

3. Corrosion Resistance

  • Typically resists white rust for around 24–96 hours in salt spray tests (ASTM B117), depending on thickness and passivation.

âš« Black Zinc Plating

1. Overview

  • Uses a black chromate conversion coating after zinc plating.

  • Gives a black or dark grey matte finish.

  • Used where low reflectivity or camouflage is needed.

2. Applications

  • Used in military, electronics, and automotive parts.

  • Visually distinctive and functional.

3. Corrosion Resistance

  • Slightly less corrosion-resistant than blue passivate unless top-coated with sealers or oils.

  • Can last 48–120 hours or more in salt spray, with added protection.

🔧 Zinc Plating Process Steps (Simplified)

  1. Cleaning & Degreasing – Removal of oils, dirt, and oxides from the metal surface.

  2. Acid Pickling – Removes rust and scale.

  3. Zinc Electroplating – Zinc is electro-deposited from a zinc salt solution using DC current.

  4. Rinsing – Cleans residual chemicals.

  5. Passivation (Blue or Black) – A chemical dip creates a protective chromate layer.

  6. Drying or Top Coating – Sometimes includes additional sealants or drying.

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We follow a strict quality-controlled procedure to ensure consistent and reliable results:

  1. Pre-treatment: Thorough degreasing and pickling to clean the surface

  2. Electroplating: Controlled zinc deposition via electrolysis

  3. Passivation: Application of blue or black chromate for enhanced protection

  4. Optional Sealing: Added topcoat or sealant for extended corrosion life

  5. Inspection & Quality Control: Every part is carefully checked before delivery

✅ Why Choose Us?

  • ISO 9001:2015 Certified Quality Management System

  • Experienced, certified engineers and skilled technicians

  • Environmentally responsible plating solutions

  • Fast turnaround and consistent finish quality

📞 Contact us today to learn how our zinc plating services can protect and enhance your components.

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