Laboratory Studies of Galvanic Corrosion of Aluminum Alloys

2009 ◽  
pp. 20-20-28 ◽  
Author(s):  
Florian Mansfeld ◽  
J. V. Kenkel
Keyword(s):  
Aluminum Alloys ◽  
Galvanic Corrosion ◽  
Laboratory Studies

Laboratory Studies of Galvanic Corrosion - II. Three-metal Couples

1975 ◽  
Vol 26 (9) ◽  
pp. 699-703 ◽  
Author(s):  
F. Mansfeld ◽  
J. V. Kenkel
Keyword(s):  
Galvanic Corrosion ◽  
Laboratory Studies

scholarly journals Combined-cycle corrosion testing of steel/6000 series aluminum alloys joined by friction welding

2021 ◽  
Author(s):  
Jianchen Jin ◽  
Takashi Iizuka
Keyword(s):  
Aluminum Alloys ◽  
Automobile Industry ◽  
Friction Welding ◽  
Tensile Testing ◽  
Galvanic Corrosion ◽  
Natural Aging ◽  
Optical Microscope ◽  
Combined Cycle ◽  
Corrosion Testing ◽  
Welding Steel

Tailored blanks, especially semi-finished parts formed by welding steel and aluminum alloys, are being employed in the automobile industry to reduce the weight of automobiles. However, when dissimilar metals are welded, galvanic corrosion due to differences in ionization tendency occurs, decreasing the reliability of such welded products. In addition, the heat input when aluminum alloys are welded causes an aging problem. In this study, combined-cycle corrosion testing was performed for S45C/6000 series steel/aluminum alloys joined by friction welding. First, S45C steel pipes were joined to A6061-T6 and A6063-T6 aluminum alloy pipes by friction welding. Then, after combined-cycle testing, changes in appearance and joint strength were investigated as the number of cycles increased. In the natural aging test, test pieces were placed in a desiccator whose temperature was adjusted to about 20 °C with a humidity from 0 to 10 %. One piece was removed at predetermined time intervals and used in tensile testing. After tensile testing, fracture surfaces were observed with an optical microscope. For the S45C/A6061 friction- welded material, a decrease in tensile strength was found at the 36th cycle. It was confirmed that the strength of the S45C/A6063 friction-welded material decreased clearly at the 27th cycle. Any obvious changes in strength were not seen in specimens after 540 hours of natural aging.

Effect of in-situ micro-arc oxidation coating on the galvanic corrosion of AZ31Mg coupled to aluminum alloys

2019 ◽  
Vol 775 ◽  
pp. 1077-1085 ◽  
Author(s):  
Li-jing Bai ◽  
Gang Kou ◽  
Kai Zhao ◽  
Gui-tao Chen ◽  
Fu-xue Yan
Keyword(s):  
Aluminum Alloys ◽  
Galvanic Corrosion ◽  
Micro Arc Oxidation

Investigation on galvanic corrosion behaviors of CFRPs and aluminum alloys systems for automotive applications

2018 ◽  
Vol 70 (6) ◽  
pp. 1036-1043 ◽  
Author(s):  
Xiayu Wu ◽  
Jiakun Sun ◽  
Jiaming Wang ◽  
Yiming Jiang ◽  
Jin Li
Keyword(s):  
Aluminum Alloys ◽  
Galvanic Corrosion ◽  
Automotive Applications ◽  
Corrosion Behaviors

Galvanic Corrosion of Aluminum

CORROSION ◽  
1979 ◽  
Vol 35 (9) ◽  
pp. 423-428 ◽  
Author(s):  
M. C. REBOUL
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloys ◽  
Sea Water ◽  
Galvanic Corrosion ◽  
Tap Water ◽  
Field Tests ◽  
Electrochemical Characteristics ◽  
Galvanic Current ◽  
Galvanic Couples ◽  
The Cost

Abstract Laboratory tests were carried out to compare the electrochemical characteristics of galvanic couples made of aluminum alloys (1050, 5086, 2024, and 7075) with other metals (plain steel, Type 316 stainless steel, titanium) in tap water and in artificial sea water. It was found that: One must first choose materials which individually resist corrosion. Only when this requirement is fulfilled can the risk of galvanic corrosion be evaluated. In aluminum-steel assemblies, taking into account only the risk of galvanic corrosion leads to the following bad choices: (1) the choice of copper containing aluminum alloys which are less anodic than copper free alloys (poor choice except when justified by mechanical factors),and (2) the choice of plain steel which is less noble than stainless steel. Although they generate weaker galvanic currents, field tests show that those assemblies made of corrosive materials have shorter life than stainless steel assembled with a copper free aluminum alloy. The galvanic current produced by the couple decreases rapidly with time, then stabilizes within a few days. The comparison of these stabilized currents seems to be the best way to compare the risks of galvanic corrosion. For a given couple of different metals, the life span of the assembly depends upon the conductivity and the aggressiveness of the environment; in other words the complexity and the cost of the protection to be used, for a given couple increase with the aggressiveness of the environment.

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