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

被引：4

作者：

de Sampaio, Marcelo T. G. ^{[1
]}

Furtado, Anderson B. ^{[1
]}

Ignacio, Marcelo D. C. ^{[1
]}

Tavares, Sergio S. M. ^{[2
]}

Pardal, Juan M. ^{[2
]}

Pimenta, Andre R. ^{[2
,3
]}

Ponzio, Eduardo A. ^{[1
]}

机构：

[1] Univ Fed Fluminense UFF, Inst Quim, Lab Mat UFF G2E LaMUFF, Rua Outeiro Sao Joao Batista S-N, BR-24020141 Niteroi, RJ, Brazil

[2] Univ Fed Fluminense UFF, Escola Engn, Programa Posgrad Engn Mecan & Montagem Ind, Niteroi, RJ, Brazil

[3] Inst Fed Rio De Janeiro, Lab Instrumentacao & Simulacao Computac LISCOMP, Campus Paracambi, Paracambi, RJ, Brazil

来源：

CORROSION ENGINEERING SCIENCE AND TECHNOLOGY | 2023年 / 58卷 / 01期

关键词：

Stainless steel; deleterious phases; sigma phase morphology; linear sweep voltammetry; CORROSION-RESISTANCE; INTERGRANULAR CORROSION; REACTIVATION TEST; ELECTROCHEMICAL-BEHAVIOR; MECHANICAL-PROPERTIES; PASSIVE FILMS; PRECIPITATION; SENSITIZATION; MICROSTRUCTURE; POLARIZATION;

D O I：

10.1080/1478422X.2022.2128376

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：1 / 11

页数：11