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·t0.91, where T is the equivalent time and t is the exposure time.
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Acknowledgements
This work is supported by the National Key Research and Development Program of China (No. 2017YFB0702300), the National Natural Science Foundation of China (No. 51222106), the Fundamental Research Funds for the Central Universities of China (No. FRF-TP-14-011C1), and the National Basic Research Program of China (973 Program, No. 2014CB643300).
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Sun, Xg., Lin, P., Man, C. et al. Prediction model for atmospheric corrosion of 7005-T4 aluminum alloy in industrial and marine environments. Int J Miner Metall Mater 25, 1313–1319 (2018). https://doi.org/10.1007/s12613-018-1684-6
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DOI: https://doi.org/10.1007/s12613-018-1684-6