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Research Papers

Investigating and Rationalizing Influence of Saline Environment on Response of an Aluminum Alloy: Experimental and Numerical Study

[+] Author and Article Information
Sheng-Li Lv

Science and Technology of UAV Laboratory,
Northwestern Polytechnical University,
Xi'an 710072, China
e-mail: lslv2003@nwpu.edu.cn

Maofei Zhang

Science and Technology of UAV Laboratory,
Northwestern Polytechnical University,
Xi'an 710072, China

Xiaosheng Gao

Professor
Fellow ASME
Department of Mechanical Engineering,
The University of Akron,
Akron, OH 44325-3903
e-mail: xgao@uakron.edu

T. S. Srivatsan

Professor
Fellow ASME
Department of Mechanical Engineering,
The University of Akron,
Akron, OH 44325-3903
e-mail: tsrivatsan@uakron.edu

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received December 8, 2015; final manuscript received July 8, 2016; published online October 27, 2016. Assoc. Editor: Antonios Kontsos.

J. Eng. Mater. Technol 139(1), 011006 (Oct 27, 2016) (9 pages) Paper No: MATS-15-1315; doi: 10.1115/1.4034924 History: Received December 08, 2015; Revised July 08, 2016

A sizeable number of structures, as key load-bearing components, are currently being made using both high-strength and medium-strength alloys of aluminum. During their service life, these alloys are often exposed to environments spanning a range of aggressiveness. In this study, the corrosion behavior of a high-strength aluminum alloy in both static and flowing saline solution was conducted using both experimental and numerical analysis. The damage resulting from environment-induced degradation, or corrosion, of the test specimens upon exposure to flowing saline solution was noticeably severe in comparison with the damage caused by exposure to static saline solution. Subsequent to flow-induced degradation, an analysis of dispersion of the corrosion products over the surface revealed it to be in the direction of flowing saline solution. The higher the flow rate of saline solution over the sample surface, the more severe and visibly evident was the severity of damage due to environment-induced degradation. Microscopic observations of the corrosion morphology for the three different flow rates revealed a greater degree of damage to the surface with an increase in flow rate of the saline solution. This can be quantified by both an increase in area of the sample that is degraded and depth of the corrosion-induced pits. Using cellular automata algorithm in conjunction with matlab software, the damage caused by flowing saline solution for three different flow rates predicted fairly accurately the severity of the environment-induced damage due to corrosion and resultant morphology of the corrosion-related debris.

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Figures

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Fig. 1

A schematic showing shape and dimensions of the specimen used for testing (thickness = 3 mm)

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Fig. 2

Morphology of the test specimens prior to degradation by corrosion

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Fig. 3

Macroscopic morphology of corrosion-induced damage on surface of aluminum alloy specimen when exposed to static saline (3.5 wt.% NaCl) solution: (a) 60 days and (b) 250 days

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Fig. 4

Morphology of corrosion debris on the test specimen surface when exposed to flowing saline solution: (a) 0.1 m/s, (b) 0.27 m/s, and (c) 0.40 m/s

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Fig. 5

Corrosion pits resulting from flow rates of 0.1 m/s (a), 0.27 m/s (b), and 0.4 m/s (c)

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Fig. 6

Predicted results for a flow rate of 0.1 m/s

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Fig. 7

A comparison of experimental observed and predicted morphology for seawater flow rate of 0.1 m/s, taken at the same magnification of 350×

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Fig. 8

The predicted results for saline solution flow rate of 0.27 m/s

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Fig. 9

A comparison of experimental and predicted damage for a flow rate of 0.27 m/s

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Fig. 10

The results for saline solution flow rate of 0.4 m/s

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Fig. 11

A comparison of experimental and predicted damage for saline solution at a flow rate of 0.4 m/s

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