DL-EPR vs. LSV-KOH: from simple detection of deleterious phases to analysis of morphology and high accuracy on determination of sigma phase in UNS S32750 stainless steel

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Engineering, Science and Technology Pub Date : 2022-10-06 DOI:10.1080/1478422X.2022.2128376

Marcelo T. G. de Sampaio, Anderson B. Furtado, M. Ignácio, S. Tavares, J. Pardal, A. Pimenta, E. Ponzio

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引用次数: 1

Abstract

ABSTRACT An optimised electrochemical technique, linear sweep voltammetry (LSV) in KOH solution (LSV-KOH) was confronted with the double loop electrochemical Potentiokinetic reactivation (DL-EPR) to verify which is the best technique to quantify deleterious phases (DP) in a UNS S32750 super duplex stainless steel. DL-EPR presented an error in determination of deleterious phases in the range of 6.9–100%. LSV-KOH show a better accuracy in quantification of deleterious phases volume fractions, the error range for LSV-KOH was 2.4–26.2%. When the morphology of sigma changes from lamellar to divorced, was observed modifications on LSV-KOH voltammograms. In specimens where lamellar morphology is present, the voltammograms show two peaks curve. Meanwhile, in specimens where occurred also divorced precipitation of sigma the voltammograms changes to a 3 peaks curve. This feature is due to the dissolution of sigma phase boundaries which has different compositions according to the form of sigma precipitation.

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DL-EPR与LSV-KOH:从简单的有害相检测到形貌分析和高精度的UNS S32750不锈钢中sigma相的测定

采用优化后的电化学技术——KOH溶液中线性扫描伏安法(LSV-KOH)与双回路电化学电位动力学再激活法(DL-EPR)进行对比，验证了哪种技术是定量UNS S32750超级双相不锈钢中有害相(DP)的最佳技术。DL-EPR对有害相的测定误差在6.9 ~ 100%之间。LSV-KOH对有害相体积分数的定量准确度较高，误差范围为2.4 ~ 26.2%。当sigma的形貌由层状变为离片状时，lv - koh的伏安图发生了变化。在片状形态存在的样品中，伏安图显示双峰曲线。同时，在同样发生sigma分离沉淀的样品中，伏安图呈3峰曲线变化。这是由于相界的溶解，根据析出形式的不同，相界的成分也不同。

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来源期刊

Corrosion Engineering, Science and Technology 工程技术-材料科学：综合

CiteScore

3.20

自引率

5.60%

发文量

审稿时长

3.4 months

期刊介绍： Corrosion Engineering, Science and Technology provides broad international coverage of research and practice in corrosion processes and corrosion control. Peer-reviewed contributions address all aspects of corrosion engineering and corrosion science; there is strong emphasis on effective design and materials selection to combat corrosion and the journal carries failure case studies to further knowledge in these areas.