Selecting a Surface Finish

A finish cannot be selected by colour name alone. Two parts described as “gold” may use electroplating, PVD, anodising or paint, with different layer structures, metallic character, hiding power, wear and corrosion behaviour. A complete specification starts with the substrate and defines the preparation, layer system, physical sample for colour and gloss, coverage, rack or masking points, service environment and validation method.

Preparation creates the visible result

Bright finishes normally require controlled grinding and polishing. Tumbling, nylon brushing, directional brushing or blasting can create satin and matt textures. Every route also requires cleaning, degreasing and suitable activation. Porosity, cracks, trapped polishing compound and solution retained in recesses can cause pits, exposed substrate, blisters or corrosion; the top layer cannot compensate for an unstable substrate.

Main finish families

Electroplating deposits metal electrochemically and is widely used on zinc and copper alloys and other properly prepared conductive substrates. Bright, antique, wiped and matt effects depend on substrate texture, layer construction and protection.

PVD deposits a very thin film in vacuum and is often used on polished or brushed stainless steel. It preserves the underlying texture, while deep recesses may show directional coverage differences.

Anodising converts an aluminium surface to an oxide layer that can be coloured while retaining a metallic appearance. Alloy and material condition affect the result, so a CNC sample does not automatically predict decorative anodising on die-cast aluminium.

Wet paint, powder coating and electrophoretic coating use organic films with broad colour ranges and better hiding power. Adhesion, thickness, edge build, orange peel, pinholes, runs and cure conditions still require control.

Developing colour and texture

LIFU Hardware, GOLDENLUCK’s group-owned plating factory, can work towards matching a customer’s physical sample or approved colour board and support trials for new plated colours. Approval should record the substrate, preparation, gloss and texture direction together. Bright finishes need a reflective base; antique and wiped effects use local light and dark contrast; nylon brushing creates directional lines; blasting creates a controlled satin or matt texture.

How to select

Start with the material and service environment, then prioritise colour, corrosion resistance, wear, feel, insulation or conductivity. Check process temperature, coverage in recesses, masking of moving fits and the risk of damage during later assembly. Approve a physical sample with a defined test plan and link the batch standard to colour-difference control.

Related terms

Electroplating · PVD · Polishing · Aluminium alloy · Colour difference