No hydrogen embrittlement
Sherardised products are guaranteed free of hydrogen embrittlement. This is particularly important in the case of safety components and products made from spring steel, hardened or high-strength steel.
Hydrogen embrittlement is caused by the diffusion of atomic hydrogen in the steel. Sherardising is a dry galvanising process and this means hydrogen embrittlement is technically impossible.
Process of heating
The pretreatment means there is no chance of hydrogen embrittlement because it involves blasting. Any hydrogen present in products will disappear during the process of heating to 300°C, before the zinc iron alloy layers are formed.
Other methods, such as the electrolytic and hot-dip galvanizing, involve the products being pretreated by staining. During such a process there is a chance that products will absorb atomic hydrogen. Some measures can reduce the risk of hydrogen embrittlement, but not render it impossible.