On the Mechanism of Intergranular Corrosion of Aluminum Alloys

Sinyavskii, V. S.; Ulanova, V. V.; Kalinin, V. D.

doi:10.1023/b:prom.0000043067.38199.95

Cited by 18 publications

(14 citation statements)

References 2 publications

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“…7, the microstructures obtained are located around the WM (weld metal), HAZ (heat affected zone), and around the BM (base metal HAZ). The microstructure of weld metal generally shows a dendritic type, while the microstructure of the header material at its base metal shows typical wrought aluminum alloy microstructure containing fine particles of the intermetallic second phases [1], [2], [8]- [9]. Similarly, the microstructure obtained from the weld metal shown in Fig.…”

Section: Metallographic Examination and Analysismentioning

confidence: 93%

“…The corrosion damage on the weld metal surface in general shows typical interdendritic corrosion. This interdendritic corrosion may have been caused by sensitization that occurred on the weld metal due to formation of a number of intermetallic phases during welding process or in service at extended high-temperature exposure [1]- [2], [8]- [9].…”

Section: Metallographic Examination and Analysismentioning

confidence: 99%

“…For further improvement in properties such as good weldability and high corrosion resistance, the alloys are also added with other solute elements in small amounts and/or modified by processing routes [6], [7]. Although by addition of other solute elements may have produced different types of intermetallic phases and could increase the strength of the alloys, however, they may lead to a higher susceptibility to localized corrosion [8], [9]. Due to the limited solubility of Mg or Mn in the aluminum matrix in both alloys at lower temperatures, the alloys become supersaturated and the excess alloying atoms together with other solute atoms would precipitate and form various intermetallic phases, preferentially at grain boundaries [1]- [2], [9].…”

Section: Introductionmentioning

confidence: 99%

“…Under certain conditions, either during fabrication/welding or in extended service at high temperatures, the solubility of principal alloying elements in the aluminum matrix will further decrease because they may interact with the existing intermetallic phases and form other new precipitates. This condition may result in a different concentration between the grains and the grain boundaries and makes the alloys sensitized and susceptible to intergranular corrosion, stress corrosion, or pitting corrosion [2], [8]- [9]. Many recently published works stated that the type of intermetallic phases that may play an important role in the intergranular corrosion and other localized corrosion on the non-heattreatable aluminum alloys include Mg2Si, Al3Mg5, Al6 (Mn, Fe), Al6 Mn, etc [1]- [2], [8].…”

Section: Introductionmentioning

confidence: 99%

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Study of Intergranular Corrosion on Non-Heat Treatable Aluminum Alloys in a Compressor After-Cooler

Adnyana¹

2021

metal.

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This study was carried out on a compressor heat exchanger (after-cooler) which had a leak in the welded joint of its components made of non-heat treatable aluminum alloys. The purpose of this study is to determine the type and cause, and mechanisms of failure associated with the metallurgical structure that occurs. In this study a number of tests have been carried out including visual and macroscopic examinations, metallographic and hardness testing, and SEM (scanning electron microscopy) analysis equipped with EDS (energy dispersive spectroscopy). The results of the study obtained indicate that the failure mechanism that causes leakage in the aluminum alloy welding joints of the compressor heat exchanger component is intergranular corrosion due to sensitization and the related effect of environmental factors that occur. In addition, the failure may also be affected by welding defect in the form of pinholes.

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Section: Metallographic Examination and Analysismentioning

confidence: 93%

Section: Metallographic Examination and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of Intergranular Corrosion on Non-Heat Treatable Aluminum Alloys in a Compressor After-Cooler

Adnyana¹

2021

metal.

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“…In addition, EBSD analysis ( Figure 2) showed that the recrystallization fraction of the alloy decreased with the decrease of the Zn/Mg ratio, which was related to the decrease of the proportion of large-angle grain boundaries [22]. However, large-angle grain boundaries of recrystallized grains were easy to form active corrosion zone, causing intergranular corrosion in a certain recrystallization stage [23]. Therefore, under the joint action of large-angle grain boundaries and GBPs, the alloy with a higher Zn/Mg ratio was more easily affected by the intergranular corrosion than the alloy with a lower Zn/Mg ratio.…”

Section: Effect Of Zn/mg Ratios On Corrosion Performancesmentioning

confidence: 99%

Effect of the Zn/Mg Ratio on Microstructures, Mechanical Properties and Corrosion Performances of Al-Zn-Mg Alloys

et al. 2020

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The effect of the Zn/Mg ratio on microstructures, mechanical properties and corrosion performances of Al-Zn-Mg alloys was studied. Microstructures were characterized using the optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). Tensile tests, intergranular corrosion (IGC) and stress corrosion cracking (SCC) tests were conducted to study the properties. Microstructures results indicated that with the decrease of the Zn/Mg ratio, the recrystallization proportion and the fraction of second phase decreased, while the size of η’ (MgZn2) phases in grain interior also significantly decreased. The number density of η’ phases in grain interior increased and grain boundary precipitates developed discontinuous distribution with the decrease of the Zn/Mg ratio. These microstructures contributed to the significant improvement of the strength and corrosion resistance. The tensile strength and yield strength increased by 34.1% and 47.4%, respectively, with the Zn/Mg ratio decreased from 11.4 to 6.1. Calculating results indicated that the enhancement of strength mainly contributed from the solid-solution strengthening, grain-boundary strengthening and precipitation strengthening. The intergranular corrosion degree was greatly relieved and the stress corrosion sensitivity index decreased from 0.031 to 0.007 with the Zn/Mg ratio decreased from 11.4 to 6.1.

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Effect of Grain Boundary and Crystallographic Orientation on the Stress Corrosion Behavior of an Al-Zn-Mg Alloy

Tang

Zhang

et al. 2019

J. of Materi Eng and Perform

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On the Mechanism of Intergranular Corrosion of Aluminum Alloys

Cited by 18 publications

References 2 publications

Study of Intergranular Corrosion on Non-Heat Treatable Aluminum Alloys in a Compressor After-Cooler

Study of Intergranular Corrosion on Non-Heat Treatable Aluminum Alloys in a Compressor After-Cooler

Effect of the Zn/Mg Ratio on Microstructures, Mechanical Properties and Corrosion Performances of Al-Zn-Mg Alloys

Effect of Grain Boundary and Crystallographic Orientation on the Stress Corrosion Behavior of an Al-Zn-Mg Alloy

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