A new look on the corrosion mechanism of magnesium: An EIS investigation at different pH

被引：62

作者：

Benbouzid, Abdelmoheiman Zakaria ^{[1
,2
]}

Gomes, Maurilio Pereira ^{[1
,3
]}

Costa, Isolda ^{[3
]}

Gharbi, Oumaima ^{[1
,2
]}

Pebere, Nadine ^{[4
]}

Rossi, Jesualdo Luiz ^{[3
]}

Tran, Mai T. T. ^{[2
]}

Tribollet, Bernard ^{[2
]}

Turmine, Mireille ^{[1
,2
]}

Vivier, Vincent ^{[1
,2
]}

机构：

[1] Sorbonne Univ, CNRS, Lab React Surface, Paris, France

[2] Sorbonne Univ, CNRS, Lab Interfaces & Syst Electrochim, Paris, France

[3] Cidade Univ, Inst Pesquisas Energet & Nucl, Ctr Ciencia & Tecnol Mat, Ave Prof Lineu Prestes, 2242,0508-000, Sao Paulo, SP, Brazil

[4] Univ Toulouse, CIRIMAT, CNRS, INPT, 4 allee Emile Monso, 31030 Toulouse 4, France

来源：

CORROSION SCIENCE | 2022年 / 205卷

基金：

巴西圣保罗研究基金会;

关键词：

Magnesium; Corrosionmechanism; Negativedifferenceeffect(NDE); Adsorbedintermediates; ElectrochemicalImpedanceSpectroscopy; Impedancemodelling; ENHANCED CATALYTIC-ACTIVITY; AERATED SULFATE MEDIUM; ACTIVE IRON ELECTRODE; HYDROGEN EVOLUTION; ANODIC-DISSOLUTION; PURE MAGNESIUM; ELECTROCHEMICAL CORROSION; WATER DISSOCIATION; MG DISSOLUTION; REACTION MODEL;

D O I：

10.1016/j.corsci.2022.110463

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study investigates the electrochemical impedance diagrams obtained for a Mg electrode in a sodium sul-phate solution at different pHs. A comprehensive model, independent of the pH range, with the presence of two adsorbed intermediates accounting for the anodic dissolution and the cathodic reaction was proposed to explain the singular behaviour of Mg at low pH values. It was also shown that, in acidic media, the contribution of the double layer as well as the cathodic partial reaction must be considered, whereas at higher pH values the oxide/ hydroxide layer plays a significant role and slows down the magnesium corrosion rate.

引用

页数：12

共 120 条

[1] Mechanism of hydrogen formation during the corrosion of Mg17Al12 [J].