Zinc Clear Type I & III – SC4

Ultimate Corrosion Resistance with a Transparent Finish

Metal Finishing Group provides Zinc Clear Plating services to the SC 4 level of supplementary treatment, offering the highest possible corrosion protection with a clean, transparent finish for steel and iron components. This process applies a sacrificial zinc coating followed by a specialized clear chromate conversion coating, precisely engineered to achieve maximum durability against the harshest environmental elements.

Zinc Clear Plating to SC 4 is chosen when components face the most extreme corrosive environments and demand ultimate resistance to both white corrosion (zinc oxidation) and red rust (iron oxidation), while maintaining a natural metallic appearance. It is ideal for highly critical automotive parts, marine hardware, and severe industrial applications where uncompromising durability and a discreet finish are essential. This robust coating provides superior, long-lasting protection against the most aggressive environmental factors.

Our Zinc Clear Plating – SC 4 Capabilities: Maximum Protection and Clarity

We offer precise Zinc Clear Plating services to SC 4 specifications, ensuring a uniform and highest-quality deposit for your most critical components.

• Ultimate Corrosion Protection: Engineered to deliver significantly higher corrosion resistance than all other SC levels (SC 1, SC 2, and SC 3), providing exceptional durability in the most aggressive environments.
• Clear Chromate Finish (Type I & III): We offer both Type I (hexavalent) and Type III (trivalent) clear chromate options. Both provide a transparent finish that preserves the zinc’s silvery-white appearance while delivering maximum corrosion performance.
• Sacrificial Protection: The zinc layer actively corrodes before the base metal, safeguarding steel and iron components from rust even under the most challenging conditions.
• Good Electrical Conductivity: Maintains favorable electrical properties, suitable for a range of electrical components where robust protection is also needed.
• Rack and Barrel Plating: We accommodate both rack and barrel plating methods to suit various part sizes and production volumes.
• Precision Thickness Control: We achieve exacting plating thicknesses to meet specific design and ultimate performance requirements.
• In-house Quality Verification: We conduct rigorous salt spray testing to confirm full compliance with SC 4 corrosion resistance requirements, ensuring peak performance.

Properties of Zinc Clear Plating – SC 4:

Zinc Clear Plating to SC 4 imparts several key properties that ensure optimal performance and longevity for components in the most demanding conditions:

• Exceptional Long-Term Corrosion Protection: Provides a superior barrier against both white corrosion and red rust, designed to withstand prolonged and severe exposure in extreme environments.
• Clean, Transparent Aesthetic: Offers a professional and appealing metallic appearance without adding color, suitable for critical applications where discretion is key.
• Cost-Effective High Performance: Delivers a reliable and economical solution for the most stringent corrosion requirements.
• Reliable Electrical Conductivity: Ensures consistent electrical continuity for functional components even under harsh conditions.
• Excellent Paint Base: Can serve as an effective primer for subsequent organic coatings, offering maximum adhesion over ultimate corrosion protection.

Applicable Specifications We Adhere To:

Our Zinc Clear Plating – SC 4 processes consistently meet or exceed crucial industry standards, ensuring the highest quality and performance of your components. We regularly process to:

• ASTM B633 (Type I & III, SC 4): This specification defines electrodeposited coatings of zinc on iron and steel. Type I refers to zinc with a hexavalent clear chromate, and Type III refers to zinc with a trivalent clear chromate. SC 4 designates the highest level of corrosion resistance for this finish, typically requiring 120 hours to white corrosion and 240 hours to red rust in a neutral salt spray test.
• And various customer-specific requirements for the most advanced corrosion protection.

Typical Zinc Clear Plating – SC 4 Applications:

Zinc Clear Plating to SC 4 is vital for numerous applications across demanding industries:

• Automotive Industry: Used for critical under-hood fasteners, brake system components, and chassis parts that endure extreme road salts and weather conditions.
• Marine Applications: Ideal for fasteners and components constantly exposed to saltwater spray and highly corrosive marine atmospheres.
• Heavy Industrial Machinery: Protects vital machine components, tools, and brackets in highly corrosive factory or outdoor settings.
• Outdoor Electronic Enclosures: Provides robust corrosion protection for housings used in exposed, outdoor, or highly challenging electronic applications.
• Construction: Used for components requiring maximum longevity and corrosion resistance in exposed structural or foundational applications.
• Agricultural Equipment: Ensures performance and longevity for parts used in demanding outdoor farming environments with high moisture or chemical exposure.

Why Choose Metal Finishing Group for Zinc Clear Plating – SC 4?

Metal Finishing Group is a trusted partner for high-quality Zinc Clear Plating to SC 4 specifications. Our commitment to precise application and rigorous quality control ensures an exceptionally durable, corrosion-resistant, and aesthetically clear finish for your most critical steel and iron components. Partner with us for reliable metal finishing solutions that provide ultimate protection and maximum performance for your parts.