Macro-galvanic effect and its influence on corrosion behaviors of friction stir welding joint of 7050-T76 Al alloy

Yong Chen; Yanqiu Wang; Li zhou; Guozhe Meng; Bin Liu; Junyi Wang; Yawei Shao; Jiantang Jiang

doi:10.1016/j.corsci.2019.108360

Macro-galvanic effect and its influence on corrosion behaviors of friction stir welding joint of 7050-T76 Al alloy

Yong Chen
, Yanqiu Wang^*
, Li zhou
, Guozhe Meng
, Bin Liu
, Junyi Wang
, Yawei Shao
, Jiantang Jiang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

58 Scopus citations

Abstract

The corrosion behavior of various zones of the 7050-T76 aluminum alloy friction stir welding (FSW) joint and their interaction were studied. The wire beam electrode (WBE) analysis reveals that heat-affected zone (HAZ) adjacent to nugget zone (NZ) receives the most intense negative current and thus presents the intensified susceptibility to corrosion. Both pitting and intergranular corrosion are aggravated greatly in HAZ while suppressed in base material (BM) when the whole FSW joint was put into NaCl solution, indicating the dominating influence from macro-galvanic effect. The coupling relationship between macro-galvanic and micro-galvanic effects is revealed based on the electrochemical analysis.

Original language	English
Article number	108360
Journal	Corrosion Science
Volume	164
DOIs	https://doi.org/10.1016/j.corsci.2019.108360
State	Published - Mar 2020
Externally published	Yes

Keywords

Al alloy
Corrosion potential
Friction stir welding
Galvanic corrosion

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10.1016/j.corsci.2019.108360

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@article{9448175e47234857bf5e3cc85ea3cc68,

title = "Macro-galvanic effect and its influence on corrosion behaviors of friction stir welding joint of 7050-T76 Al alloy",

abstract = "The corrosion behavior of various zones of the 7050-T76 aluminum alloy friction stir welding (FSW) joint and their interaction were studied. The wire beam electrode (WBE) analysis reveals that heat-affected zone (HAZ) adjacent to nugget zone (NZ) receives the most intense negative current and thus presents the intensified susceptibility to corrosion. Both pitting and intergranular corrosion are aggravated greatly in HAZ while suppressed in base material (BM) when the whole FSW joint was put into NaCl solution, indicating the dominating influence from macro-galvanic effect. The coupling relationship between macro-galvanic and micro-galvanic effects is revealed based on the electrochemical analysis.",

keywords = "Al alloy, Corrosion potential, Friction stir welding, Galvanic corrosion",

author = "Yong Chen and Yanqiu Wang and Li zhou and Guozhe Meng and Bin Liu and Junyi Wang and Yawei Shao and Jiantang Jiang",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2020",

month = mar,

doi = "10.1016/j.corsci.2019.108360",

language = "英语",

volume = "164",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd",

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TY - JOUR

T1 - Macro-galvanic effect and its influence on corrosion behaviors of friction stir welding joint of 7050-T76 Al alloy

AU - Chen, Yong

AU - Wang, Yanqiu

AU - zhou, Li

AU - Meng, Guozhe

AU - Liu, Bin

AU - Wang, Junyi

AU - Shao, Yawei

AU - Jiang, Jiantang

PY - 2020/3

Y1 - 2020/3

N2 - The corrosion behavior of various zones of the 7050-T76 aluminum alloy friction stir welding (FSW) joint and their interaction were studied. The wire beam electrode (WBE) analysis reveals that heat-affected zone (HAZ) adjacent to nugget zone (NZ) receives the most intense negative current and thus presents the intensified susceptibility to corrosion. Both pitting and intergranular corrosion are aggravated greatly in HAZ while suppressed in base material (BM) when the whole FSW joint was put into NaCl solution, indicating the dominating influence from macro-galvanic effect. The coupling relationship between macro-galvanic and micro-galvanic effects is revealed based on the electrochemical analysis.

AB - The corrosion behavior of various zones of the 7050-T76 aluminum alloy friction stir welding (FSW) joint and their interaction were studied. The wire beam electrode (WBE) analysis reveals that heat-affected zone (HAZ) adjacent to nugget zone (NZ) receives the most intense negative current and thus presents the intensified susceptibility to corrosion. Both pitting and intergranular corrosion are aggravated greatly in HAZ while suppressed in base material (BM) when the whole FSW joint was put into NaCl solution, indicating the dominating influence from macro-galvanic effect. The coupling relationship between macro-galvanic and micro-galvanic effects is revealed based on the electrochemical analysis.

KW - Al alloy

KW - Corrosion potential

KW - Friction stir welding

KW - Galvanic corrosion

UR - https://www.scopus.com/pages/publications/85078737162

U2 - 10.1016/j.corsci.2019.108360

DO - 10.1016/j.corsci.2019.108360

M3 - 文章

AN - SCOPUS:85078737162

SN - 0010-938X

VL - 164

JO - Corrosion Science

JF - Corrosion Science

M1 - 108360

ER -

Macro-galvanic effect and its influence on corrosion behaviors of friction stir welding joint of 7050-T76 Al alloy

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Keywords

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