Effect of solution heat treatment on the pitting corrosion behavior of a high Mn austenitic stainless steel in chloride solution

Q3 Earth and Planetary Sciences Rem-Revista Escola De Minas Pub Date : 2015-03-01 DOI:10.1590/0370-44672015680002

José Wilmar Calderón Hernandez, Duberney H. Ladino, C. Azevedo, N. A. Falleiros

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引用次数: 5

Abstract

The effect of solution heat treatment on the pitting corrosion resistance of 17Cr-6Mn-5Ni-1.5Cu austenitic stainless steel in 0.6M NaCl aqueous solution was evaluated. UNS S30403 (304L) steel was used as benchmark material. Solution heat treatments (SHT) were conducted at 1010°C, 1040°C, 1070°C and 1100°C. The microstructural characterization revealed the presence of δ-ferrite, especially in the asreceived condition (AR). The SHT decreased the proportion of the ferrite phase. Mnrich precipitates were observed in the as-received condition of 17Cr-6Mn-5Ni-1.5Cu steel, but they were dissolved after the SHT, causing localized Mn enrichment in the austenite. Potentiodynamic tests showed that the pitting potential (Ep) in the 304L steel was not altered significantly after SHT. On the other hand, the value of Ep of the 17Cr-6Mn-5Ni-1.5Cu steel decreased after SHT. This detrimental effect was explained by the formation of Mn enrichment areas due to the solubilization of Mn-rich precipitates, which promoted preferential Cl- adsorption in these regions.

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固溶热处理对高锰奥氏体不锈钢在氯化物溶液中点蚀行为的影响

研究了固溶热处理对17Cr-6Mn-5Ni-1.5Cu奥氏体不锈钢在0.6M NaCl水溶液中耐点蚀性能的影响。以UNS S30403 (304L)钢为基准材料。分别在1010℃、1040℃、1070℃和1100℃进行固溶热处理(SHT)。显微组织表征显示δ-铁氧体的存在，特别是在接收条件下。SHT降低了铁素体相的比例。17Cr-6Mn-5Ni-1.5Cu钢在接收条件下观察到富锰析出，但在SHT后它们被溶解，导致局部Mn富集在奥氏体中。动电位试验表明，高温处理后304L钢的点蚀电位(Ep)变化不明显。另一方面，17Cr-6Mn-5Ni-1.5Cu钢的Ep值在SHT后有所下降。这种不利影响可以解释为富锰沉淀的增溶作用形成了Mn富集区，促进了这些区域对Cl的优先吸附。

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Rem-Revista Escola De Minas 工程技术-工程：土木

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0.00%

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审稿时长

6-12 weeks

期刊介绍： REM – International Engineering Journal (antigua REM – Revista Escola de Minas) es la primera revista técnica de Sudamérica. Fue fundada en enero de 1936 por los estudiantes de la Escuela de Minas de Ouro Preto y desde entonces se ha especializado en la publicación de artículos en las áreas de la Ingeniería Civil, Geología, Metalurgia y Materiales y, Minería y Mecánica y Energía. Su objetivo es servir como un medio de publicación para los trabajos técnicos y científicos originales de investigadores nacionales y extranjeros en esas áreas. Contribuciones originales (artículos y cartas) son aceptadas. Artículos de revisión dependen de la invitación y/o análisis de los Editores. El envío de artículos para su publicación implica que el trabajo no ha sido publicado previamente, que no está siendo presentado para su publicación en otra revista y no se publicará en otro lugar, en la misma forma, sin el permiso, por escrito, de los Editores/Autores.

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