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Effect of Shot Peening and Plasma Electrolytic Oxidation on the Intergranular Corrosion Behavior of 7A85 Aluminum Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The effects of shot peening (SP) and plasma electrolytic oxidation (PEO) on the intergranular corrosion behavior of the novel high strength aluminum alloy 7A85 (AA 7A85) were investigated by electrochemical polarization and electrochemical impedance tests. The intergranular corrosion mechanism of SP, PEO and PEO combined with sealing-treated AA 7A85 was studied by the metallographic analysis, residual stress testing, X-ray diffractometer analysis and scanning electron microscopy. The results show that AA 7A85-T7452 is very sensitive to intergranular corrosion. SP would significantly improve its intergranular corrosion resistance. This is attributed to the combination action of residual compressive stress and grain refinement. PEO would reduce the largest corrosion depth by 41.6%. Moreover, PEO without sealing did not eliminate the intergranular corrosion due to the existence of the micropores and microcracks in the oxide coating. However, PEO combined with the SiO2 sol–gel sealing treatment could effectively protect the AA 7A85-T7452 from intergranular corrosion because of the good corrosion resistance and barrier function of the sealed coating.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51171154).

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Authors and Affiliations

  1. Corrosion and Protection Research Laboratory, Northwestern Polytechnical University, Xi’an, 710072, China

    Zuoyan Ye, Daoxin Liu & Chongyang Li

  2. AVIC the First Aircraft Institute, Xi’an, 710089, China

    Xiaoming Zhang, Zhi Yang & Mingxia Lei

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  1. Zuoyan Ye
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  2. Daoxin Liu
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  3. Chongyang Li
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  4. Xiaoming Zhang
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  5. Zhi Yang
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  6. Mingxia Lei
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Correspondence to Daoxin Liu.

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Ye, Z., Liu, D., Li, C. et al. Effect of Shot Peening and Plasma Electrolytic Oxidation on the Intergranular Corrosion Behavior of 7A85 Aluminum Alloy. Acta Metall. Sin. (Engl. Lett.) 27, 705–713 (2014). https://doi.org/10.1007/s40195-014-0104-9

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  • DOI: https://doi.org/10.1007/s40195-014-0104-9

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