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Effects of cathodic polarization on SCC behavior of AA7003 under various aging treatments

阴极极化对不同时效状态 7003 铝合金应力腐蚀行为的影响

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Abstract

In this paper, the effect of cathodic polarization on corrosion behavior of AA7003 under three kinds of aging treatments (including peak aging (PA), double peak aging (DPA) and regression re-aging (RRA)) was studied in 3.5 wt% sodium chloride solution through slow strain rate testing(SSRT) and electrochemical testing. X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods were also applied to investigating corrosion behavior and fracture morphology. The results showed that under open circuit, stress corrosion cracking (SCC) of AA7003 might by classified as anodic dissolution. In this case, the extent of SCC susceptibility (ISCC) of AA7003 alloy with different aging treatments was as follows: ISCC(PA)>ISCC(DPA)>ISCC(RRA). On the other hand, stress corrosion cracking (SCC) of AA7003 under cathodic polarization might be classified as hydrogen embrittlement (HE) which had been proved in this paper by presence of AlH3 diffraction peak in XRD patterns. In this case, for AA7003 with any of the three aging treatments, hydrogen embrittlement susceptibility (IHE) increases with negatively shifting of cathodic polarization.

摘要

采用电化学腐蚀试验与不同阴极极化电位下的慢应变速率拉伸试验, 并结合 XRD 衍射图谱分析及 SEM 断口形貌观察, 研究了阴极极化对峰时效 (PA), 双峰时效 (DPA) 以及回归再时效 (RRA) 7003 铝合金在 3.5% NaCl 溶液中应力腐蚀类型的影响。 结果表明, 在开路电位下 7003 铝合金的应力腐蚀主要由阳极溶解控制, 应力腐蚀敏感性 ISCC (PA) >ISCC (DPA) >ISCC。 而在外加阴极电位的情况下 XRD 衍射谱中出现 AlH3 衍射峰, 断口形貌则表现出沿晶及解理倾向, 说明应力腐蚀转变为由氢脆控制, 且氢脆敏感性 (IHE) 随着极化电位的负移而不断增加, 其中 3 种时效状态的敏感性顺序为: IHE (PA) >IHE (DPA) >IHE (RRA)。

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Authors and Affiliations

  1. School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, China

    Xing Qi  (祁星), Bin Sun  (孙斌), Xiao-yan Zhang  (张晓燕), Wen-juan Qi  (祁文娟), Chao Wang  (王超) & Ren-guo Song  (宋仁国)

  2. Jiangsu Key Laboratory of Materials Surface Technology, Changzhou University, Changzhou, 213164, China

    Xing Qi  (祁星), Bin Sun  (孙斌), Xiao-yan Zhang  (张晓燕), Wen-juan Qi  (祁文娟), Chao Wang  (王超) & Ren-guo Song  (宋仁国)

  3. Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou, 213164, China

    Xing Qi  (祁星), Bin Sun  (孙斌), Xiao-yan Zhang  (张晓燕), Wen-juan Qi  (祁文娟), Chao Wang  (王超) & Ren-guo Song  (宋仁国)

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  1. Xing Qi  (祁星)
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Correspondence to Ren-guo Song  (宋仁国).

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Foundation item: Projects(51371039, 51871031) supported by the National Natural Science Foundation of China; Project supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), China

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Qi, X., Sun, B., Zhang, Xy. et al. Effects of cathodic polarization on SCC behavior of AA7003 under various aging treatments. J. Cent. South Univ. 25, 2299–2308 (2018). https://doi.org/10.1007/s11771-018-3914-5

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  • DOI: https://doi.org/10.1007/s11771-018-3914-5

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