Corr）均降低，同時加劇了表面點蝕和晶間腐蝕程度。2A97-T3合金通過進(jìn)行固溶和雙級人工時效處理的共同作用得到2A97-T6合金，此時T1相數(shù)量大大增加且分布更加均勻。因此，熱處理工藝降低了2A97鋁合金的腐蝕電位，導(dǎo)致2A97-T6合金的耐腐蝕性能略弱于2A97-T3合金。晶間θ相的解體誘導(dǎo)了2A97-T3合金的剝落腐蝕形貌，而2A97-T6合金的點蝕形貌是由晶內(nèi)T1相的溶解造成的。"/>

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人工時效和腐蝕介質(zhì)濃度對2A97 Al-Cu-Li合金電化學(xué)腐蝕行為的影響
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安徽工業(yè)大學(xué) 機(jī)械工程學(xué)院，安徽 馬鞍山 243032

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the Key Projects of Scientific Research in Colleges and Universities of Anhui Provincial Department of Education(KJ2021A036), Major Natural Science Research Project of Anhui Provincial Department of Education (KJ2016SD09) for supporting


Effects of Artificial Aging and Corrosion Medium Concentration on Electrochemical Corrosion Behavior of 2A97 Al-Cu-Li Alloys
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Affiliation:

School of Mechanical Engineering, Anhui University of Technology, Ma'anshan 243032, China

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Key Projects of Scientific Research in Colleges and Universities of Anhui Provincial Department of Education (KJ2021A036); Major Natural Science Research Project of Anhui Provincial Department of Education (KJ2016SD09)

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    摘要:

    采用動電位極化曲線電化學(xué)方法研究了2A97-T3和2A97-T6 Al-Cu-Li合金的耐腐蝕性能，并以第3代典型2060-T8合金、2099-T83鋁鋰合金和航空用2024-T4高強(qiáng)鋁合金為參考對象進(jìn)行了比較。通過分析電化學(xué)參數(shù)和腐蝕形貌，發(fā)現(xiàn)合金在3種濃度的NaCl溶液中的耐腐蝕性為2A97-T3>2A97-T6>2024-T4>2060-T8>2099-T83。隨著NaCl溶液濃度的增加，合金的腐蝕電位（ECorr）均降低，同時加劇了表面點蝕和晶間腐蝕程度。2A97-T3合金通過進(jìn)行固溶和雙級人工時效處理的共同作用得到2A97-T6合金，此時T1相數(shù)量大大增加且分布更加均勻。因此，熱處理工藝降低了2A97鋁合金的腐蝕電位，導(dǎo)致2A97-T6合金的耐腐蝕性能略弱于2A97-T3合金。晶間θ相的解體誘導(dǎo)了2A97-T3合金的剝落腐蝕形貌，而2A97-T6合金的點蝕形貌是由晶內(nèi)T1相的溶解造成的。

    Abstract:

    The corrosion resistance of 2A97-T3 and 2A97-T6 Al-Cu-Li alloys was studied by the electrochemical method through potentiodynamic polarization curves. The typical third generation 2060-T8, 2099-T83, and 2024-T4 alloys were used as reference for comparison. Through the analysis of electrochemical parameters and corrosion morphology, the results reveal that the corrosion resistance of the alloys in NaCl solution of different concentrations is as follows: 2A97-T3>2A97-T6>2024-T4>2060-T8>2099-T83. With increasing the concentration of NaCl solution, the corrosion potential (ECorr) of all alloys is decreased. Moreover, the surface pitting and intergranular corrosion become severe. The T1 phase greatly increases with more uniform distribution in 2A97-T6 alloy, which is obtained from the 2A97-T3 alloy after the solid solution coupled with double-stage artificial aging treatment. Consequently, the heat treatment process reduces the corrosion potential of 2A97-T6 Al alloy, which leads to the slightly weaker corrosion resistance of 2A97-T6 Al alloy than that of 2A97-T3 alloy. The disintegration of the intergranular θ phase induces the exfoliation corrosion morphology of 2A97-T3 alloy, and the pitting morphology of 2A97-T6 alloy is caused by the dissolution of intragranular T1 phase.

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張鵬,趙新生,饒思賢.人工時效和腐蝕介質(zhì)濃度對2A97 Al-Cu-Li合金電化學(xué)腐蝕行為的影響[J].稀有金屬材料與工程,2023,52(5):1573~1582.[Zhang Peng, Zhao Xinsheng, Rao Sixian. Effects of Artificial Aging and Corrosion Medium Concentration on Electrochemical Corrosion Behavior of 2A97 Al-Cu-Li Alloys[J]. Rare Metal Materials and Engineering,2023,52(5):1573~1582.]
DOI：10.12442/j. issn.1002-185X.20220822

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  • 收稿日期:2022-10-19
  • 最后修改日期:2022-12-30
  • 錄用日期:2022-12-30
  • 在線發(fā)布日期: 2023-05-31
  • 出版日期: 2023-05-29