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| THE MECHANISM OF NITROGEN EFFECT ON THE SCC BEHAVIOR OF 00Cr18Ni5Mo3Si2 DUPLEX STAINLESS STEEL |
| Ai Wenshan Zuo Jingyi (Beijing Institute of Chemical Technology)Wu Jiu (Central Iron and Steel Research Institute) |
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Abstract After immersion in 30%MgCl_2 solution (boiling),the surface films of the 00CrlSNi5Mo3Si2 steels with different nitrogen contents were analyzed.Nitrogen was found to enrich in the surface film,and the higher the nitrogen content in the duplex stain- less steel was,the more amount of nitrogen was enriched in the surface film.Enrichment of Ni and Mo was influenced by nitrogen content with the content of nitrogen≥0.073% for Ni alone,and≥0.11% for both Ni and Mo.The combined effect of nitrogen and Mo increased the passivation ability of the surface film.The potentiostatic immersion test showed that anodic polarization thickened the surface film and weakened the effect of ni- trogen.A simulated occluded cell (OC) was used to study the chemical changes in the OC of the duplex stainless steel in 0.5N NaCl solution (50℃,pH=7).It was found that nitro- gen had little effect on either the pH fall or Cl~- enrichment in the OC,and that there was no NH_4~+ in the OC.TEM analysis showed that dislocation changed from layer structure in- to net structure and that stacking fault enrgy increased with the increase of nitrogen con- tent.
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Received: 25 February 1991
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Cite this article:
Ai Wenshan Zuo Jingyi (Beijing Institute of Chemical Technology)Wu Jiu (Central Iron and Steel Research Institute). THE MECHANISM OF NITROGEN EFFECT ON THE SCC BEHAVIOR OF 00Cr18Ni5Mo3Si2 DUPLEX STAINLESS STEEL. J Chin Soc Corr Pro, 1991, 11(1): 9-16.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1991/V11/I1/9
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