Intergranular corrosion of Zn-free and Zn-microalloyed Al-xCu-yLi alloys

J. F. Li; N. Birbilis; D. Y. Liu; Y. L. Chen; X. H. Zhang; C. Cai

doi:10.1016/j.corsci.2016.01.001

Intergranular corrosion of Zn-free and Zn-microalloyed Al-xCu-yLi alloys

J. F. Li^*, N. Birbilis, D. Y. Liu, Y. L. Chen, X. H. Zhang, C. Cai

^*Corresponding author for this work

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

71 Citations (Scopus)

Abstract

The influence of 0.42 and 0.72 wt.% Zn on the intergranular corrosion (IGC) of Al-3.7Cu-1.15Li-0.5Mg and Al-2.7Cu-1.7Li-0.3Mg alloys (representing different Cu/Li ratios) was investigated. IGC dependence on ageing time was studied and a primitive IGC diagram established. With ageing, the potential of the Al-xCu-yLi alloys lowered due to precipitation, accompanied by grain boundary precipitate coarsening. Concomitantly, corrosion mode evolved with ageing from pitting and local IGC (early ageing), general IGC (under-aged), local IGC (near peak-aged) and pitting (over-aged). Of key interest is that Zn additions remarkably decreased the IGC sensitivity of the Al-2.7Cu-1.7Li-0.3Mg.

Original language	English
Pages (from-to)	44-57
Number of pages	14
Journal	Corrosion Science
Volume	105
DOIs	https://doi.org/10.1016/j.corsci.2016.01.001
Publication status	Published - 1 Apr 2016
Externally published	Yes

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10.1016/j.corsci.2016.01.001

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@article{9c48980fde0b430ea43c7de583c105c6,

title = "Intergranular corrosion of Zn-free and Zn-microalloyed Al-xCu-yLi alloys",

abstract = "The influence of 0.42 and 0.72 wt.% Zn on the intergranular corrosion (IGC) of Al-3.7Cu-1.15Li-0.5Mg and Al-2.7Cu-1.7Li-0.3Mg alloys (representing different Cu/Li ratios) was investigated. IGC dependence on ageing time was studied and a primitive IGC diagram established. With ageing, the potential of the Al-xCu-yLi alloys lowered due to precipitation, accompanied by grain boundary precipitate coarsening. Concomitantly, corrosion mode evolved with ageing from pitting and local IGC (early ageing), general IGC (under-aged), local IGC (near peak-aged) and pitting (over-aged). Of key interest is that Zn additions remarkably decreased the IGC sensitivity of the Al-2.7Cu-1.7Li-0.3Mg.",

keywords = "A. Alloy, A. Aluminium, B. Polarization, B. TEM, C. Intergranular corrosion",

author = "Li, {J. F.} and N. Birbilis and Liu, {D. Y.} and Chen, {Y. L.} and Zhang, {X. H.} and C. Cai",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd.",

year = "2016",

month = apr,

day = "1",

doi = "10.1016/j.corsci.2016.01.001",

language = "English",

volume = "105",

pages = "44--57",

journal = "Corrosion Science",

issn = "0010-938X",

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TY - JOUR

T1 - Intergranular corrosion of Zn-free and Zn-microalloyed Al-xCu-yLi alloys

AU - Li, J. F.

AU - Birbilis, N.

AU - Liu, D. Y.

AU - Chen, Y. L.

AU - Zhang, X. H.

AU - Cai, C.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - The influence of 0.42 and 0.72 wt.% Zn on the intergranular corrosion (IGC) of Al-3.7Cu-1.15Li-0.5Mg and Al-2.7Cu-1.7Li-0.3Mg alloys (representing different Cu/Li ratios) was investigated. IGC dependence on ageing time was studied and a primitive IGC diagram established. With ageing, the potential of the Al-xCu-yLi alloys lowered due to precipitation, accompanied by grain boundary precipitate coarsening. Concomitantly, corrosion mode evolved with ageing from pitting and local IGC (early ageing), general IGC (under-aged), local IGC (near peak-aged) and pitting (over-aged). Of key interest is that Zn additions remarkably decreased the IGC sensitivity of the Al-2.7Cu-1.7Li-0.3Mg.

AB - The influence of 0.42 and 0.72 wt.% Zn on the intergranular corrosion (IGC) of Al-3.7Cu-1.15Li-0.5Mg and Al-2.7Cu-1.7Li-0.3Mg alloys (representing different Cu/Li ratios) was investigated. IGC dependence on ageing time was studied and a primitive IGC diagram established. With ageing, the potential of the Al-xCu-yLi alloys lowered due to precipitation, accompanied by grain boundary precipitate coarsening. Concomitantly, corrosion mode evolved with ageing from pitting and local IGC (early ageing), general IGC (under-aged), local IGC (near peak-aged) and pitting (over-aged). Of key interest is that Zn additions remarkably decreased the IGC sensitivity of the Al-2.7Cu-1.7Li-0.3Mg.

KW - A. Alloy

KW - A. Aluminium

KW - B. Polarization

KW - B. TEM

KW - C. Intergranular corrosion

UR - http://www.scopus.com/inward/record.url?scp=84954287785&partnerID=8YFLogxK

U2 - 10.1016/j.corsci.2016.01.001

DO - 10.1016/j.corsci.2016.01.001

M3 - Article

SN - 0010-938X

VL - 105

SP - 44

EP - 57

JO - Corrosion Science

JF - Corrosion Science

ER -

Intergranular corrosion of Zn-free and Zn-microalloyed Al-xCu-yLi alloys

Abstract

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