Historical
DIN EN 2516:1997
Aerospace series - Passivation of corrosion resistant steels and decontamination of nickel base alloys
The document has to improve the corrosion resistant characteristics of a part after such treatment as machining, forming, tumbling and shot peening by removing foreign metal contamination due to these operations. Passivation shall not be used on castings, welded or brazed parts, carburized or nitrided surfaces nor parts with mating surfaces when entrapment of acids may occur
Deutsches Institut für Normung [din]