Hardness of the layer
The hardness of the layer after sherardization is about 400 HV (41 HRC) and exceeds the hardness of other zinc layers or lacquers. This property makes sherardizing popular in rough or rugged applications where corrosion protection and wear resistance are important.
The hard layer is resistant to mechanical stress.
Diffusion galvanizing creates a solid alloy with the base material. This cannot just come off or peel off.
Products that are regularly assembled and disassembled thus retain their corrosion protection, but also parts that are exposed to, for example, stone chips.