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CORROSION DUE TO DAMAGE DURING INSTALLATION The sustainable protection against corrosion of highstrength fasteners such as slotted clamping pins or springloaded lock washers poses a major challenge Corroded slotted clamping pin due to surface damage during insertion Early corrosion of a tension washer due to insufficient ductility of the surface coating On the one hand hydrogeninduced brittle fracture must be prevented On the other hand sufficient abrasion resistance and duc - tility of the surface are absolutely essential due to stress subjected during installation and operation Despite high resistance during the salt spray test in an unassembled state conventionally coated slotted clamping pins and curved spring washers have unfortunately increasingly shown early signs of corrosion For effectively protecting the fasteners subject to high mechanical stress against corrosion we have developed the innovative mechanical galvanising “MZSH” Its special coating structure combines the active corrosion protection of zinc with passive protective effect of modern finishing treatment technologies