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Corrosion Behaviour of Manganese‐Containing. Stainless steels. I. Galvanostatic measurements in H 2 SO 4 solutions

1972; Wiley; Volume: 23; Issue: 7 Linguagem: Inglês

10.1002/maco.19720230708

1521-4176

A.M. Shams El Din, M. M. Madran, Shahid Khalil,

Concrete Corrosion and Durability

Abstract The results of galvanostatic polarization experiments on four 17.3% Cr / 5.3% Ni stainless steels containing increasing amounts of Mn (upto 13.9%) are compared with those of an 18/8 stainless steel. All alloyes exhibit an initial step for the dissolution of Fe. A second arrest is recorded in dilute acid solutions and/or when applying high currents, and is related to the oxidation of the Cr. With an alloy containing traces of N 2 , a third arrest is observed in dilute acid solutions; it is attributed to the oxidation of Cr 2 N. The incorporation of Mn in CrNi steels is detrimental to their anti‐corrosion characteristics. The content of this metal should be kept as low as feasible.