Does Galvanised Metal Rust - Zinc Coated Indexing Plunger

Rust Prevention Mechanism and Performance of Galvanised Metal

The secret behind galvanised metal’s rust resistance lies in its unique dual protection mechanism. At Mocayo, we employ electro-galvanising technology that meets ASTM B633 standards, forming a dense zinc crystal layer on the steel substrate. Laboratory tests show that a standard 12μm zinc coating can endure 200 hours of neutral salt spray testing without red rust, delivering corrosion resistance 8-10 times greater than that of plain carbon steel. Can galvanised metal rust affect performance? Mocayo’s zinc-coated indexing plunger maintains precise positioning and resists rust, even in aggressive or high-moisture environments.

Fine-thread Indexing Plunger

Coarse Self-Locking Indexing Plunger

But does galvanised metal rust? In reality, galvanised metal benefits from electrochemical protection through the sacrificial anode effect of zinc. Even if minor scratches appear on the coating, zinc continues to protect the underlying metal, preventing corrosion from developing.

In practical applications, the protective performance of galvanised metal is mainly influenced by three factors:

• Coating Quality: Mocayo adopts a specialized potassium chloride galvanising process to produce a denser crystal structure.

• Service Environment: Optimal performance is achieved within a pH range of 6-12.

• Mechanical Damage: For frictional contact areas, thicker coatings are recommended.

For highly corrosive environments, Mocayo recommends applying thicker coatings ranging from 15μm to 20μm to ensure extended service life.

Zinc Coating Requirements for Indexing Plunger

As a precision positioning component, the indexing plunger requires highly controlled surface treatments. According to Mocayo’s in-house testing, zinc-coated indexing plungers with optimized plating not only maintain ±0.01mm positioning accuracy but also deliver a service life over three times longer than standard products.

Our specially developed composite coating technology enables:

• Excellent Corrosion Resistance: Withstands 500-hour salt spray testing.

• Outstanding Wear Resistance: Coefficient of friction maintained at 0.1–0.15.

• Stable Mechanical Properties: Hardness HV200-250.

When selecting surface treatments for indexing plungers, several key factors should be considered:

• Corrosiveness of the Operating Environment

• Expected Frequency of Operation

• Required Positioning Accuracy

• Budget and Cost Control

As Mocayo’s engineers advise:

“For high-frequency automated equipment, we recommend an 8-12μm zinc coating combined with dedicated lubrication treatments.”

Mocayo Zinc Coated Indexing Plunger Solutions

Mocayo’s zinc-coated indexing plunger solutions strictly comply with ISO 4042 international standards. Our fully automated electroplating production lines guarantee consistent product quality. Our professional technical process includes:

Advanced Manufacturing Processes:

• Pre-Treatment: Precision 7-step cleaning process.

• Electroplating: Constant temperature and current density control.

• Post-Treatment: Environmentally friendly trivalent chromium passivation.

Rigorous Testing System:

• Coating Thickness Measurement: X-ray fluorescence method.

• Salt Spray Testing: Per ASTM B117 standards.

• Adhesion Testing: Cross-cut and bending methods.

• Dimensional Accuracy Testing: 3D coordinate measurement.

Product Series Advantages:

• Standard Products: Diameter ranges from 5mm to 25mm, available for immediate delivery.

• Custom Services: Special coatings and non-standard dimensions available.

• Technical Support: Professional product selection guidance.

By choosing Mocayo, you will benefit from:

• Reliable products that meet international standards.

• Professional and meticulous technical support.

• Comprehensive quality assurance systems.

• Flexible and tailored customization services.

We are always ready to provide you with the most suitable indexing plunger solutions. Please feel free to contact us for further consultation and cooperation.