Zinc plating is widely used to provide sacrificial corrosion protection to steel and is usually deposited in thicknesses varying from 5 to over 25 µm. Zinc plated coatings are usually passivated by immersing in chromate solution to increase the resistance of the zinc to corrosion, supplementary treatments can be applied after chromating to provide specific characteristics such as;
With suitable pre treatment zinc can be deposited on almost any substrate, though by far the most common are ferrous substrates, however certain materials such as cast iron and carbonitrided steel require processing in specific types of zinc bath.
We offer both rack and barrel plating services and a range of passivates and sealers including;
The protective value of the coating is dependent upon;
High tensile components and components that have been hardened to specific levels of surface hardness may require baking treatments before plating (stress relief), and after plating for the relief of hydrogen embrittlement.
The baking times and temperatures are dependent upon the UTS and/or the surface hardness of the part.
High tensile or hardened parts that are not baked for the relief of hydrogen embrittlement can failure in service or even before service, more details are provided in ISO 9587 and ISO 9588.
We provide rack and barrel zinc plating with a range of passivates including ELV and RoHS compliant passivates, including processing to the following standards;