Comparing intergranular corrosion in Al-Mg-Si-Cu alloys with and without α-Al(Fe,Mn,Cu)Si particles

被引：9
|
作者：
Lervik, Adrian [1 ]
Danbolt, Turid [2 ]
Furu, Trond [2 ,3 ]
Holmestad, Randi [1 ]
Lunder, Otto [2 ,4 ]
机构：
[1] Norwegian Univ Sci & Technol NTNU, Dept Phys, N-7491 Trondheim, Norway
[2] Norwegian Univ Sci & Technol NTNU, Dept Mat Sci & Engn, Trondheim, Norway
[3] Norsk Hydro ASA, Oslo, Norway
[4] SINTEF Ind, Trondheim, Norway
来源：
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2021年 / 72卷 / 03期
关键词：
aluminium alloys; electron microscopy; grain boundaries; intergranular corrosion; microstructure; INTERMETALLIC PHASES; ALUMINUM-ALLOYS; COPPER CONTENT; AGING CONDITIONS; HEAT-TREATMENT; IN-SITU; PRECIPITATION; BEHAVIOR; MODEL; MICROSTRUCTURE;
D O I：
10.1002/maco.202011954
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, a model alloy without Fe and Mn additions, is compared with a commercial AA6005 alloy to further understand how the alpha-Al(Fe,Mn,Cu)Si particles affect intergranular corrosion (IGC) behaviour. Both alloys were subjected to an accelerated IGC test for durations ranging from 1 to 120 h. Microstructures were studied using scanning and transmission electron microscopy, and electron backscatter diffraction. The presence of alpha-Al(Fe,Mn,Cu)Si particles yields significantly more uniform IGC attacks and higher corrosion rates. However, the maximum depth of IGC attacks reaches similar values after similar to 24 h of exposure. This is attributed to the formation of Cu-rich particles along the grain boundaries during the corrosion process, which further catalyses the cathodic reactions.
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页码：575 / 584
页数：10
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