Influence of Mn-Ni alloying elements on surface film and pitting resistance of Cr-Mn austenitic stainless steels
By Qu, H. P.; Chen, H. T.; Lang, Y. P.
Published in Construction and Building Materials
NULL
2016
Abstract
Abstract This research focused on surface film and corrosion resistance of three commercial type 200 austenitic stainless steels including L4, {L1} and {LH} with different Mn/Ni mass ratio in Chinese market. X-ray photoelectron spectrum (XPS) results showed that Fe, Cr and Mn oxide layer thickness and passive film thickness were reduced as Mn/Ni mass ratio increased. Mn enrichment was only found in {LH} passive film. Mn oxide percentage in {LH} passive film was also the highest. These disadvantages deteriorated pitting resistance of LH, which was proved by anodic polarization result. Mn/Ni mass ratio should not be higher than 1.7 to ensure good corrosion resistance and low raw material cost.
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