Maximum Corrosion Resistance with a Durable Black Finish

Metal Finishing Group provides Zinc Black Type II – SC 4 plating services, offering the highest level of corrosion protection available for this finish, combined with a uniform, deep black appearance on steel and iron components. This process involves applying a sacrificial zinc coating followed by a specialized black chromate conversion coating, precisely formulated to achieve the SC 4 level of supplementary treatment.

Zinc Black Type II – SC 4 is chosen when components face the most extreme corrosive environments and demand maximum resistance to both white corrosion (zinc oxidation) and red rust (iron oxidation). It is ideal for highly critical automotive parts, military equipment, and severe industrial applications where uncompromising durability and a non-reflective black aesthetic are essential. This robust coating provides superior, long-lasting protection against the harshest environmental factors.

Our Zinc Black Type II – SC 4 Capabilities: Ultimate Protection and Precision

We offer precise Zinc Black Type II – SC 4 plating services, 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.
  • Black Chromate Finish: Applies a rich, uniform black chromate conversion coating over the zinc, ensuring both a distinct aesthetic and unparalleled corrosion performance.
  • Sacrificial Protection: The zinc layer actively corrodes before the base metal, safeguarding steel and iron components from rust even when the coating is scratched.
  • Non-Reflective Appearance: The matte black finish is ideal for applications where glare reduction is critical, maintaining a professional and tactical look.
  • 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 Black Type II – SC 4:

Zinc Black Type II – SC 4 plating 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.
  • Distinct Black Finish: Offers a professional and aesthetically pleasing dark appearance suitable for high-performance applications.
  • Reduced Light Reflection: The matte black surface minimizes glare, crucial for specific equipment and tactical visual needs.
  • Maximized Durability: This advanced coating system significantly extends the service life of ferrous metals in aggressive settings.
  • Cost-Effective High Performance: Delivers a reliable and economical solution for the most stringent corrosion requirements.

Applicable Specifications We Adhere To:

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

  • ASTM B633 (Type II, SC 4): This specification defines electrodeposited coatings of zinc on iron and steel. Type II refers to zinc with a black chromate conversion coating. 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 Black Type II – SC 4 Applications:

Zinc Black Type II – SC 4 plating is vital for numerous applications across demanding industries:

  • Military and Defense: Applied to critical firearm components, ordnance, and weapon systems requiring maximum corrosion protection and glare reduction in harsh operational environments.
  • Automotive Industry: Used for fasteners, brake components, and exposed chassis parts that endure extreme road and weather conditions.
  • Heavy Industrial Machinery: Protects vital machine components, tools, and brackets in highly corrosive factory or outdoor settings.
  • Marine Applications: Ideal for fasteners and components exposed to constant saltwater spray and corrosive marine atmospheres.
  • Agricultural Equipment: Ensures longevity and performance for parts used in demanding outdoor farming environments.
  • Electronic Enclosures: Provides robust corrosion protection for housings used in outdoor, exposed, or highly challenging electronic applications.

Why Choose Metal Finishing Group for Zinc Black Type II – SC 4?

Metal Finishing Group is a trusted partner for high-quality Zinc Black Type II – SC 4 plating. Our commitment to precise application and rigorous quality control ensures an exceptionally durable, corrosion-resistant, and aesthetically pleasing black 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.