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In-situ localized corrosion behavior of SiCp/Al composites in 3.5% NaCl aqueous solution

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Abstract

The localized corrosion behaviors of SiCp/Al composites in 3.5% NaCl solution were in-situ investigated by the scanning micro-reference electrode technique. The results show that pitting is a predominant corrosion mechanism in these composites. Hydrolysis of Al4C3 at the interface of the composites is responsible for the first stage of the pitting attack. It was found that metastable pits were re-passivated by the corrosion products of Al(OH)2Cl and Al(OH)Cl2, and the propagation of metastable pits is related to the formation of AlCl3. In addition, a pitting mechanism for the composites is proposed.

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Acknowledgements

The authors would like to thank Professor C. J. Lin for his technical assistance during the SMRE tests performed at the Chemistry Department, College of Chemistry and Chemical Engineering, Xiamen University, China. This work is supported by the National Natural Science Foundation of China (Grant Nos. 51262023 and 51501164) and Key Laboratory of Inorganic function material and device, Chinese Academy of Sciences (Grant No. KLIFMD-2015-05).

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Authors and Affiliations

  1. Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province, Nanchang Hangkong University, Nanchang, 330063, China

    Xia Cui, Xianliang Zhou, Delai Ouyang & Zhiguo Ye

  2. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Xia Cui & Xianliang Zhou

  3. School of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou, 310018, China

    Min Zhu

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  1. Xia Cui
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  2. Xianliang Zhou
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  4. Zhiguo Ye
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Correspondence to Xianliang Zhou.

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Cui, X., Zhou, X., Ouyang, D. et al. In-situ localized corrosion behavior of SiCp/Al composites in 3.5% NaCl aqueous solution. Appl. Phys. A 124, 75 (2018). https://doi.org/10.1007/s00339-017-1488-y

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