Enhancing Performance with Specialist Metallic Coatings at Protec Group

In the world of precision engineering, performance isn't defined by geometry alone – it's also shaped by the surface. At Protec Group, we understand that the right metallic coating can significantly enhance a component's durability, functionality, and aesthetic. That's why, in collaboration with our trusted supply partner, we offer a range of specialist metallic coatings tailored to meet the unique demands of each project.

From Surtec 650 for aerospace-grade aluminium to Resicoat epoxy coatings for high-performance insulation, zinc and nickel coatings for superior corrosion resistance and wear protection, and additional advanced coatings such as anodising and phosphate treatments, our coatings add value across a wide spectrum of industries. In this blog, we explore the benefits of these coatings, their applications, and how Protec supports customers in choosing the right solution.

1. Why Surface Coatings Matter

In high-precision engineering, surface coatings serve several critical roles:

• Corrosion resistance: Protecting base materials from oxidation and environmental degradation.
• Electrical insulation or conductivity: Depending on the requirement, coatings can either isolate or enhance electrical flow.
• Wear and abrasion resistance: Extending the life of moving parts under load or friction.
• Chemical resistance: Enabling use in harsh or corrosive environments.
• Aesthetic and identification: Improving visual appeal and traceability of parts.

Selecting the right surface treatment is as important as the material and machining process used. That’s where Protec adds value.

2. Overview of Protec’s Coating Capabilities

Through our established supply chain, Protec provides specialist coatings as an integrated part of our manufacturing service. Whether it’s a prototype batch or low-volume production run, we ensure each part receives the appropriate coating to meet the required specifications.

Our approach combines:

• Technical consultation to identify the ideal coating based on the environment, function, and substrate.
• Certified application partners who meet industry standards for consistency and compliance.
• Traceability and inspection, with coating certificates and finish verification as standard.

3. Key Coatings Offered and Their Applications

Surtec 650 (Trivalent Chromium Passivation)

Surtec 650 is a REACH-compliant trivalent chromium conversion coating for aluminium and its alloys. It provides excellent corrosion resistance and serves as an ideal base for paint and powder coatings.

• Industries: Aerospace, automotive, electronics
• Key benefits: Environmentally friendly, corrosion-resistant, improves paint adhesion

Resicoat (Epoxy Powder Coating)

Resicoat is a high-performance epoxy coating applied via electrostatic spray or fluidised bed. It provides excellent dielectric insulation and protection in demanding environments.

• Industries: Power systems, defence, heavy industry
• Key benefits: Strong electrical insulation, high chemical and corrosion resistance, uniform coating

Zinc Coating (Electroplated or Hot-Dip Galvanised)

Zinc coatings are widely used for protecting steel components from rust. They can be enhanced with chromate passivation for further durability.

• Industries: Construction, automotive, general engineering
• Key benefits: Cost-effective corrosion protection, wide applicability, available in various finishes

Nickel Coating (Electroless or Electrolytic)

Nickel plating provides a hard, wear-resistant surface with excellent corrosion resistance and a smooth, decorative finish.

• Industries: Aerospace, tooling, instrumentation
• Key benefits: Uniform thickness (especially electroless), good wear resistance, aesthetic appeal

Phosphate Coatings (Manganese or Zinc Phosphate)

Phosphate coatings improve corrosion resistance, reduce wear, and provide an excellent base for lubricants and paints.

• Industries: Automotive, firearms, fasteners, forming tools
• Key benefits: Enhances paint adhesion, reduces friction, cost-effective

Anodising (Type II & Type III for Aluminium)

Anodising enhances corrosion resistance and surface hardness on aluminium parts.

• Type II: Decorative and corrosion-resistant finishes.
• Type III (Hard Anodising): Provides high wear resistance and electrical insulation.

Industries: Aerospace, consumer electronics, medical devices

Chromate Conversion Coating (Yellow or Clear)

Often combined with zinc or aluminium, chromate coatings offer corrosion protection and electrical conductivity. Surtec 650 is a modern, environmentally friendlier trivalent chromium alternative.

• Industries: Aerospace, military, electronics

Copper Plating

Used for conductive underlayers, EMI shielding, or decorative finishes.

• Industries: Electronics, RF components
• Key benefits: Excellent electrical conductivity and strong adhesion

Tin Plating

Tin plating offers corrosion resistance, solderability, and conductivity, suitable for food-grade and medical applications.

• Industries: Electrical connectors, food processing equipment

Zinc-Nickel Alloy Coating

An advanced alternative to standard zinc plating with superior corrosion resistance, especially in cyclic environments.

Industries: Automotive, aerospace, heavy industry

4. Choosing the Right Coating: Protec’s Engineering Support

With so many coating options available, selecting the most appropriate one can be a challenge. Protec's team works closely with clients from the earliest stages of design to:

• Understand environmental and operational demands
• Review material compatibility
• Evaluate regulatory or sector-specific requirements
• Ensure the coating process aligns with critical tolerances and dimensions

Our proactive engineering support helps eliminate guesswork, avoid costly revisions, and ensure optimal component performance.

5. Quality Assurance and Certification

Quality and compliance are at the core of everything we do. All coatings provided through Protec come with:

• Full traceability and material certification
• Visual and dimensional inspection
• Conformance to industry standards such as REACH, RoHS, ISO, and sector-specific specifications (e.g., MIL-spec for defence)

By integrating coating services with our CNC machining, 3D scanning, and inspection capabilities, we deliver fully validated components ready for end use.

Conclusion

Metallic coatings are a critical component of many engineered parts, enhancing everything from corrosion resistance to electrical performance. By partnering with trusted coating suppliers and providing in-house technical support, Protec Group ensures every component we deliver performs exactly as required – and lasts longer in service.

If you're developing a new part or refining an existing design, talk to us about the right coating solution for your application.

Contact nick.prtak@protecltd.co.uk to discuss your metallic coating requirements.