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Volume 14
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10.3390/ma14174924
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Article

The Localized Corrosion and Stress Corrosion Cracking of a 6005A-T6 Extrusion Profile

by
Jijun Ma
1,*,
Jing Sun
1,
Quanmei Guan
1,
Qingwei Yang
2,
Jian Tang
2,
Chengxiong Zou
2,
Jun Wang
2,3,
Bin Tang
2,3,
Hongchao Kou
2,3,
Haisheng Wang
1,
Jun Gao
1,
Jinshan Li
2,3,* and
William Yi Wang
2,3,*
1
CRRC Tangshan Co., Ltd., Tangshan 063035, China
2
State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
3
Innovation Center, NPU Chongqing, Chongqing 401135, China
*
Authors to whom correspondence should be addressed.
Materials 2021, 14(17), 4924; https://doi.org/10.3390/ma14174924
Submission received: 23 July 2021 / Revised: 21 August 2021 / Accepted: 23 August 2021 / Published: 30 August 2021
(This article belongs to the Special Issue Corrosion Prediction and Corrosion Protection)
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Abstract

In the present work, the localized corrosion and stress corrosion cracking (SCC) behaviors of a commercial 6005A-T6 aluminum extrusion profile was studied comprehensively. The velocity of crack growth in self-stressed double-cantilever beam (DCB) specimens under constant displacement was estimated, which also provides insight into the local microstructure evolutions at the crack tips caused by the localized pitting corrosion, intergranular corrosion (IGC), and intergranular SCC. Characterizations of local corrosion along the cracking path for a period of exposure to 3.5% NaCl were revealed via optical microscope (OM), scanning electron microscope (SEM), and electron backscatter diffraction (EBSD). The typical features of the pits dominated by the distribution of precipitates included the peripheral dissolution of the Al matrix, channeling corrosion, intergranular attack, and large pits in the grains. The discontinuous cracking at the crack tips indicated the hydrogen-embrittlement-mediated mechanism. Moreover, the local regions enriched with Mg2Si and Mg5Si6 phases and with low-angle grain boundaries presented better SCC resistance than those of the matrix with high-angle grain boundaries, supporting a strategy to develop advanced Al–Mg–Si alloys via interfacial engineering.
Keywords: stress corrosion cracking; pitting; intergranular corrosion; grain boundaries stress corrosion cracking; pitting; intergranular corrosion; grain boundaries

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MDPI and ACS Style

Ma, J.; Sun, J.; Guan, Q.; Yang, Q.; Tang, J.; Zou, C.; Wang, J.; Tang, B.; Kou, H.; Wang, H.; et al. The Localized Corrosion and Stress Corrosion Cracking of a 6005A-T6 Extrusion Profile. Materials 2021, 14, 4924. https://doi.org/10.3390/ma14174924

AMA Style

Ma J, Sun J, Guan Q, Yang Q, Tang J, Zou C, Wang J, Tang B, Kou H, Wang H, et al. The Localized Corrosion and Stress Corrosion Cracking of a 6005A-T6 Extrusion Profile. Materials. 2021; 14(17):4924. https://doi.org/10.3390/ma14174924

Chicago/Turabian Style

Ma, Jijun, Jing Sun, Quanmei Guan, Qingwei Yang, Jian Tang, Chengxiong Zou, Jun Wang, Bin Tang, Hongchao Kou, Haisheng Wang, and et al. 2021. "The Localized Corrosion and Stress Corrosion Cracking of a 6005A-T6 Extrusion Profile" Materials 14, no. 17: 4924. https://doi.org/10.3390/ma14174924

APA Style

Ma, J., Sun, J., Guan, Q., Yang, Q., Tang, J., Zou, C., Wang, J., Tang, B., Kou, H., Wang, H., Gao, J., Li, J., & Wang, W. Y. (2021). The Localized Corrosion and Stress Corrosion Cracking of a 6005A-T6 Extrusion Profile. Materials, 14(17), 4924. https://doi.org/10.3390/ma14174924

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