Prediction model for atmospheric corrosion of 7005-T4 aluminum alloy in industrial and marine environments

Xiao-guang Sun; Peng Lin; Cheng Man; Jian Cui; Hai-bo Wang; Chao-fang Dong; Xiao-gang Li

doi:10.1007/s12613-018-1684-6

Volume 25 Issue 11

Nov. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(11): 1313-1319

Xiao-guang Sun, Peng Lin, Cheng Man, Jian Cui, Hai-bo Wang, Chao-fang Dong, and Xiao-gang Li, Prediction model for atmospheric corrosion of 7005-T4 aluminum alloy in industrial and marine environments, Int. J. Miner. Metall. Mater., 25(2018), No. 11, pp. 1313-1319. https://doi.org/10.1007/s12613-018-1684-6

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Xiao-guang Sun, Peng Lin, Cheng Man, Jian Cui, Hai-bo Wang, Chao-fang Dong, and Xiao-gang Li, Prediction model for atmospheric corrosion of 7005-T4 aluminum alloy in industrial and marine environments, Int. J. Miner. Metall. Mater., 25(2018), No. 11, pp. 1313-1319. https://doi.org/10.1007/s12613-018-1684-6

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Research Article

Prediction model for atmospheric corrosion of 7005-T4 aluminum alloy in industrial and marine environments

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Corresponding author:
Xiao-guang Sun E-mail: sunxiaoguang@cqsf.com
Received: 7 February 2018; Revised: 14 June 2018; Accepted: 15 June 2018

Abstract

Abstract

Accelerated corrosion tests of the 7005-T4 aluminum alloy were conducted to determine a suitable service life prediction method by using alternating wet-dry cycles in three kinds of solutions. The morphology and composition analysis of the corrosion product revealed that slight corrosion occurred on the surfaces of the samples immersed in a 0.25wt% Na₂S₂O₈ solution. However, pitting corrosion occurred on the surfaces of the samples immersed in a 3.5wt% NaCl solution, whereas exfoliation corrosion occurred on the surfaces of the samples immersed in a mixture of 0.25wt% Na₂S₂O₈ and 3.5wt% NaCl solutions. A power exponent relationship was observed between the mass loss and exposure time of the 7005-T4 aluminum alloy immersed in the three kinds of solutions. In the mixture of 0.25wt% Na₂S₂O₈ and 3.5wt% NaCl solutions, the mass loss of the aluminum alloy yielded the maximum value. Based on the calculation of the correlation coefficients, the alternating wet-dry procedure in a 3.5wt% NaCl solution could be used to predict the corrosion behavior of 7005-T4 aluminum alloy exposed in the atmosphere of Qingdao, China. The prediction model is as follows:T=104.28·t^0.91, where T is the equivalent time and t is the exposure time.
- aluminum alloy;
- atmospheric corrosion;
- accelerated test;
- correlation coefficient;
- relational model

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