Decorative Chrome Plating
Decorative chrome plating is a very thin chromium layer, around 0.1–0.5 µm, over a nickel (and often copper) undercoat that gives the familiar bright, blue-white mirror finish. The nickel beneath provides most of the corrosion protection; the chrome adds tarnish and scratch resistance.
What it is
A typical decorative system is copper for levelling, then bright nickel (about 10–30 µm), then a thin chromium top layer. The quality and thickness of the nickel largely decides how long the part resists corrosion outdoors.
Hexavalent and trivalent chrome processes are both used. Trivalent chrome is more environmentally friendly and gives a slightly darker or warmer tone.
Typical applications
- Bathroom fittings, taps and fixtures
- Automotive and two-wheeler trim and accessories
- Furniture and appliance hardware
- Handles, knobs and consumer products
Suitable materials
- Steel
- Brass and copper
- Zinc die castings
- Plated plastics (ABS, with special pre-treatment)
Points to consider
- The final shine depends on the base surface; parts are usually polished before plating.
- For outdoor or salt exposure, specify a duplex (semi-bright + bright) nickel system.
- Zinc die castings need a copper strike first and careful control to avoid blistering.
- State whether hexavalent or trivalent chrome is required for compliance.
Frequently asked questions
Why does chrome plating rust or peel?
Usually because the nickel undercoat was too thin or porous, or the base was not properly cleaned. A correct copper-nickel-chrome build prevents most failures.
What is the difference between trivalent and hexavalent chrome?
Both give a chrome finish. Trivalent is far less toxic and is replacing hexavalent in many uses; its colour is slightly darker.
Can plastics be chrome plated?
Yes, plating-grade plastics such as ABS can be etched, metallised and then copper-nickel-chrome plated. This is common on automotive trim.