Surface Treatment of Fasteners

Fasteners without surface treatment are very susceptible to environmental corrosion and rust. Therefore, we usually perform surface treatment on the fasteners produced, including Oxidation, Phosphate, Zinc Plated, Painting, Ruspert, Dacrotized, etc.

Zinc Plating

Zinc Plating is a process that prevents corrosion by coating a layer of zinc on the metal surface. Zinc Plating is the most common surface treatment because of its high cost performance. Among them, white zinc, yellow zinc, and black zinc are the most common colors.

Features

• Corrosion Resistance: The Zinc Plating coating serves as a barrier that prevents moisture, oxygen, and other corrosive substances from reaching the underlying metal, thereby extending the lifespan of the metal.
• Self-Healing: The zinc layer has the ability to self-heal. When the surface is scratched or damaged, zinc will form a protective oxide film, continuing to protect the underlying metal.
• Durability: The Zinc Plating coating retains its performance under various environmental conditions, offering strong durability and weather resistance.
• Cost-Effective: Zinc Plating is a relatively economical method of corrosion protection, widely used in construction and manufacturing industries.

Zinc Plating Type

• Hot-Dip Zinc Plating: Immersing the metal in molten zinc to form a uniform Zinc Plated coating on its surface.
• Electro-Zinc Plating: Depositing zinc on the metal surface through an electrochemical process.
• Mechanical Zinc Plating: Coating the metal surface with zinc powder through mechanical impact.

Spray paint

Painting is the process of providing fasteners with a protective coating designed to enhance their corrosion resistance, wear resistance and aesthetics.

Painting Type

• Primer: Primers are used to provide good adhesion and corrosion protection, enhancing the performance of the topcoat.
• Topcoat: Topcoats provide color and gloss, while also protecting the underlying layers of paint and fasteners.
• Clearcoat: Clearcoats are transparent protective coatings that add gloss and durability.

Painting method

• Spray Coating: Using a spray gun to evenly apply paint on the surface of fasteners, suitable for mass production and fasteners with complex shapes.
• Dip Coating: Immersing the fasteners in paint, then removing them to let excess paint drip back, suitable for small-scale or batch production of fasteners.
• Electrophoretic Coating: Forming a uniform coating on the surface of fasteners through electrophoresis technology, providing excellent corrosion resistance and adhesion.
• Powder Coating: Applying powder paint on the fastener surface using electrostatic spray equipment, then curing the powder through heating to form a durable coating.

Features

• Corrosion Resistance: The paint layer provides corrosion protection, extending the lifespan of fasteners, especially in harsh environments.
• Wear Resistance: The paint layer improves the wear resistance of fasteners, reducing abrasion and damage.
• Aesthetics: The paint layer offers a variety of color options, enhancing the appearance of fasteners.
• Environmental Friendliness: Modern painting techniques use eco-friendly coatings that reduce volatile organic compound (VOC) emissions, making them environmentally friendly.

Ruspert

Ruspert is a highly effective anti-corrosion surface treatment technology, mainly used to protect metal surfaces from rust and corrosion.

Features

• Excellent Corrosion Resistance: The combination of galvanizing, chemical conversion coating, and ceramic coating provides excellent corrosion protection in various environments.
• Environmental Friendliness: Ruspert coatings have evolved to include water-based coating systems, reducing VOC emissions and improving working conditions.
• Durability: The coatings are designed to withstand harsh conditions, including salt spray, humidity, and chemical exposure.

Structure of Ruspert coating

• Base Galvanized Layer: The first layer is a metallic zinc coating that provides sacrificial protection for the underlying metal.
• Chemical Conversion Coating: The second layer is an advanced anti-corrosion chemical conversion coating, enhancing corrosion resistance and ensuring strong adhesion between the zinc layer and the topcoat.
• Baked Ceramic Topcoat: The final layer is a baked ceramic coating, serving as a barrier against corrosive elements.

Dacrotized

Dacrotized is a surface treatment technology primarily used for the protection and aesthetic enhancement of metal and plastic surfaces. The Dacrotized coating is an inorganic compound containing zinc and aluminum flakes. When applied to metal, it provides rust and corrosion resistance. Dacrotized coating of fasteners is a cost-effective alternative to stainless steel, offering similar corrosion resistance at a lower price.

Features

• Corrosion Resistance: Dacrotized fasteners have excellent corrosion resistance, making them ideal for outdoor and marine environments.
• Durability: These fasteners are highly durable and can withstand extreme conditions, including exposure to saltwater and chemicals.
• High-Temperature Resistance: Suitable for both hot and cold environments.
• Aesthetic Appeal: The coating provides a smooth, uniform surface, enhancing the appearance of the fasteners.

Oxidation

Oxidation includes anodizing, electrochemical oxidation, thermal oxidation, and chemical oxidation. Essentially, it forms an oxide film on the surface of fasteners through various methods to prevent moisture and oxygen in the air from directly contacting the metal.

Features

• Corrosion Resistance: Oxidation treatment forms a dense oxide film on the metal surface, effectively isolating it from oxygen, moisture, and other corrosive substances in the environment, significantly enhancing the material's corrosion resistance.
• Wear Resistance: The oxide film generally has high hardness, effectively improving the wear resistance of the metal surface.
• Decorative Effect: Oxidation treatment not only enhances the material's performance but also improves its appearance.
• Adhesion Improvement: The surface treated with oxidation typically has better adhesion, which is beneficial for subsequent coating or bonding processes.

Phosphating

Phosphating is a chemical treatment process primarily used for corrosion protection and pre-coating treatment of metal surfaces. By forming an insoluble phosphate protective film on the metal surface, phosphating can significantly enhance the metal's corrosion resistance and the adhesion of subsequent coatings.

Features

• Corrosion Resistance: The phosphate coating effectively isolates the metal from corrosive agents in the environment, preventing oxidation and corrosion.
• Improved Coating Adhesion: The presence of a phosphate coating significantly enhances the adhesion of subsequent coatings, preventing peeling and cracking.
• Wear Resistance: Certain types of phosphate coatings have good wear resistance, increasing the durability of the metal surface.
• Friction Reduction: The surface treated with phosphating has a certain level of lubrication, which can reduce the coefficient of friction and extend the service life of mechanical components.
• Prevents Metal Sticking: During metal forming or processing, the phosphate coating can prevent metal sticking, improving processing efficiency.

The above are 6 common surface treatment methods. Meigesi Fastener can provide products with a variety of different surface treatments. Please feel free to contact us if you need any.

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