The primary purpose of zinc plating is to protect metals from the effects of corrosion or rust.

Zinc Plated coatings are “sacrificial” coatings – meaning the coating sacrifices itself in order to protect the substrate beneath, as the coating oxidizes the corrosion itself continues to provide a level of protection to the substrate.

Zinc plating comes in different colours, but each of the colours can result from the type of plating formulation used. They do not necessarily have the same resulting corrosion resistance properties as each other. Further, zinc plating types also vary in their ability to protect from both “red” (iron related) and “white” (alloy related) corrosion types.

We offer the following,

Zinc Gold Passivate

Yellow Zinc (Gold Zinc) is the most common type of zinc plating used in automotive parts finishing. Gold is its colour only – it does not contain actual gold. Of all the zinc types it retains a good average level of corrosion resistance.

Black Zinc

Some suppliers use a black oxide coating or dye over the surface of zinc plating (e.g. olive drab) and call it black zinc. Others use formulations that are actually black plated. The level of corrosion resistance of the latter will be somewhat lower than that of gold zinc – but better than clear passivate. The oxide-coated versions will tend to offer slightly better resistance due to the additional coating and depending on the underlying type of zinc used.

Blue or Clear Zinc

Though clear zinc, you would imagine, has no colour, often it is referred to as blue as it can result in a blue-ish hue. This type of coating is often achieved by tri-valent based processes which are more environmentally friendly than the hex-valent versions but offer lower corrosion resistance properties.