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Localised corrosion

Localised corrosion appears as surface corrosion with the additional formation of hollows and holes.

 
The passive layer is penetrated locally. When high-grade stainless steel comes into contact with an active medium containing chlorine, localised corrosion also occurs alone with pinprick notches in the material. Deposits and rust may also trigger localised corrosion. All fasteners should therefore be regularly cleaned of residue and deposits.

 

Austenitic steels such as A2 and A4 are more resistant to localised corrosion than ferritic chrome steels.