A new theory for the negative difference effect in magnesium corrosion

被引：104

作者：

Bender, S. ^{[1
]}

Goellner, J. ^{[2
]}

Heyn, A. ^{[2
,3
]}

Schmigalla, S. ^{[2
]}

机构：

[1] Inst Lacke & Farben eV, D-39112 Magdeburg, Germany

[2] Univ Magdeburg, D-39016 Magdeburg, Germany

[3] BAM Bundesanstalt Mat Forsch & Prufung, Fachgrp 61, D-12205 Berlin, Germany

来源：

MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2012年 / 63卷 / 08期

关键词：

current density-potential-curve; magnesium alloys; magnesium corrosion; negative difference effect; polarization measurements; ELECTROCHEMICAL BEHAVIOR; ANODIC-DISSOLUTION; CHLORIDE; ALLOYS; MECHANISM; NACL; MG;

D O I：

10.1002/maco.201106225

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

An unusual feature known as the negative difference effect (NDE) can be observed in magnesium when recording corrosion current densitypotential curves. More hydrogen is evolved at a more positive potential which does not occur in conventional metals. Several models have been proposed in the literature in order to explain the phenomenon of NDE. They succeed in explaining some effects, and fail to deal with others. A new model, which explains the NDE by two electron consuming processes, is presented in this paper. By potentiostatic investigations of magnesium in a chloride electrolyte, measurements of hydrogen evolution and chemical analysis of the electrolyte the new model was experimentally verified.

引用

页码：707 / 712

页数：6

共 19 条

[1]

The negative difference effect and unipositive Mg+ [J].