The influences of microstructure and nitrogen alloying on pitting corrosion of type 316L and 20 wt.% Mn-substituted type 316L stainless steels

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The effects of nitrogen alloying on pitting corrosion of type 316LN and 20 wt.% Mn-substituted type 316LN stainless steels were investigated by potentiodynamic polarization tests in Cl- ion-bearing neutral and acidic solutions. Fitting resistance was markedly improved through the nitrogen alloying in both types of alloys, compared with the nitrogen-free alloys. It was confirmed that the added nitrogen was solid-solutioned in the austenitic phase without Forming ally nitrides under 20 min heat treatment at 1150 degreesC. From the in situ observation on the initiation and growth of pits, pitting was found to occur consistently at the sites of inclusions. The pitting corrosion behaviors in both types of alloys were discussed with respect to the role of sulfides as initiators of pitting corrosion, and the changes of repassivation properties due to the nitrogen alloying in the alloys. (C) 2000 Published by Elsevier Science Ltd.
Publisher
Elsevier Limited
Issue Date
2001-01
Language
English
Article Type
Article
Keywords

CR-NI ALLOYS; SULFIDE INCLUSIONS; STOCHASTIC-MODELS; INITIATION; SYSTEM

Citation

CORROSION SCIENCE, v.43, no.1, pp.53 - 68

ISSN
0010-938X
DOI
10.1016/S0010-938X(00)00074-3
URI
http://hdl.handle.net/10203/79060
Appears in Collection
MS-Journal Papers(저널논문)
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