Why Sherardize?

Long Term Corrosion Protection

The Sherardized coating provides long term corrosion protection due to the continuous and unbroken sacrificial zinc alloy layer


Sherardizing is a proven anti-corrosion Zinc coating which, when correctly specified and applied, gives a resilient and uniform defence against the corrosion of the base metal, making Sherardizing an ideal coating for small components such washers, bolts, nuts, springs, castings and forgings in addition to irregularly shaped and recessed components with close dimensional tolerances. Normal process thickness is in the range of 15-80 µm .

Wear Resistant

Due to the Iron content of a Sherardized coating, it is the hardest and most wear resistant of the zinc finishes and is able to withstand mechanical damage without loss of performance. The alloyed adhesion characteristics are such that the coating will not lift or peel and can only be removed by chemical (acid) or mechanical (shot blasting) means.

Cost Efficient

The true cost of protecting components from corrosion considers both the initial cost of protection, post treatments and the lifetime maintenance cost. Sherardizing provides a highly effective long term coating which is competitive on an initial cost basis.

Controlled Coating Thickness

Precise process control ensures both intra and inter batch uniformity.

Provides An Excellent Surface Key

The smooth matt grey surface of a Sherardized component accepts top coats without the need for primers, thereby reducing costs and lead times.

No Hydrogen Embrittlement

A hydrogen atom is the smallest atom possible and it can enter the structure of steel if it is introduced during treatment, causing a loss of ductility or sub-microscopic cracking. Sherardizing involves no sources of hydrogen and therefore provides a coating method which is free of sources of embrittlement is suitable for use even in high tensile steels.

Relatively Low Processing Temperature

Sherardizing takes place within a temperature range of between 330 and 425˚C which is lower than other coating methods such as galvanising. The result of this is that components which would not withstand the higher temperatures can be processed without losing their mechanical properties eg springs.

Environmentally Friendly

Sherardizing is an approaching zero discharge process with no aqueous or toxic gas emissions.