Surface & Metal Treatments

Sigma operates a full capability metal and surface treatment house, providing comprehensive wet and dry finishes for aerospace customers across the globe. Every process is Nadcap approved, quality assured, and executed by specialist technicians to the exact requirements of each programme.

The standard is on the surface

Chromic Anodising

Self-healing, ductile opaque films for corrosion and wear protection. Used as a pre-treatment for specialist painting processes and to improve adhesion and lubrication for paint primers.

The standard is on the surface

Tartaric Anodising

Precision-formulated tartaric anodising for maximum corrosion resistance, fatigue resistance, and paint adhesion on aluminium alloys. Carried out in-house to minimise contamination and environmental impact.

The standard is on the surface

Alocrom

Chromate conversion coatings such as Alocrom 600, 1000, and 1500 for pre-paint application, electrical conductivity requirements, and aluminium corrosion prevention. Minimal change to surface appearance.

The standard is on the surface

Dry Film Lubricants

Complete dry film lubricant solutions for aerospace and automotive applications. End-to-end solutions executed by specialist technicians to exact customer specifications.

The standard is on the surface

Epoxy Prime & Finish Schemes

In-house epoxy treatments increasing paint adhesion, resistance to industrial fluids, flexibility, and corrosion inhibition. Applied to a variety of alloys across multiple applications, completed to the highest certifications and approvals.

The standard is on the surface

Etch Primer

Effective base coat for epoxy finishes promoting component longevity and enhanced filiform corrosion resistance. Avoids the need to de-oxidise surfaces before application.

The standard is on the surface

Paint Spray & Stoving

Specialist paint spray of complex components using conventional spray applications. Organic and water-based paints including enamel, dry film lubricant, and sacrificial corrosion-resistant coatings, each finished to exact customer specifications.

The standard is on the surface

Polyurethane Finish Schemes

Military-standard polyurethane solutions tailored with resins for resistance to industrial fluids and environmental influences. Full coverage for complex components across aerospace and defence applications.

The standard is on the surface

Rock Hard Lacquer

Acrylic water-based lacquer delivering high gloss finish, colour match, and toughened protection against corrosion. Heat resistant and hard wearing for engine and vehicle components across diverse industrial markets.

The standard is on the surface

Water-Based Primer Solutions

Bespoke aqueous primer blends protecting against corrosion and promoting adhesion for polyurethane sealants. Environmentally friendly options available with outstanding protective results.

The standard is on the surface

Magnetic Particle Inspection (MPI)

Non-destructive subsurface detection within ferromagnetic materials by direct or indirect magnetisation. Ultraviolet light identification of fault presence by magnetic flux leakage, carried out by Nadcap accredited technicians.

The standard is on the surface

Fluorescent Penetrant Inspection (FPI)

Chemical non-destructive testing for detection of minute surface flaws in smooth, tight-pored metals. Scientifically designed to suit material and surface type in accordance with suspected damage type.

The standard is on the surface

Masking

Full masking service with complete design of hard and soft processes including jig and rack design. All processes meeting customer requirements and full Nadcap certifications.

The standard is on the surface

Complex Masking

Multi-finish masking allowing simultaneous application of different treatments in close proximity on the same part. Single-step masking and sealing for efficiency and cost reduction.