Contact Corrosion
Contact corrosion can occur if incorrect fasteners (bolts, nuts, washers, etc.) are used.
For this reason, only fasteners with a special surface coating may be installed.
Furthermore, only rubber/plastic parts and adhesive made of electrically non-conductive materials are used.
If there are doubts about whether the parts are suitable, then use new parts. Refer to the Electronic Parts Information (ETKA).