Influence of Aging Treatment on Intergranular Corrosion and Exfoliation Corrosion Susceptibility of Super-high Strength Al Alloy Containing Sc
摘 要
通过晶间腐蚀、剥落腐蚀和电化学腐蚀试验, 结合扫描电镜和透射电镜等分析手段, 研究了含钪Al-Mg-Zn-Cu-Zr合金在不同时效状态下的的晶间腐蚀和剥落腐蚀行为。结果表明, 合金抗晶间腐蚀和剥落腐蚀能力随着时效时间的延长而提高, 在4.0 mol/L NaCl+ 0.1 mol/L HNO3+0.4 mol/L KNO3(EXCO)溶液中测试的极化曲线也表现出相同的趋势。透射电镜观察表明, 晶界析出相和晶界无沉淀析出带(PFZ)是影响合金腐蚀性能的主要因素。随着时效时间的延长, 非平衡相η′ 和S′ 相逐渐向平衡相η和S相转变, 晶界析出相粗化并呈链状分布, PFZ变宽。晶界粗大平衡相的不均匀分布和PFZ阻断了腐蚀的阳极通道, 使合金的腐蚀敏感性降低。
Abstract
The influence of aging treatment on intergranular corrosion and exfoliation corrosion susceptibility of super-high strength Al alloy containing Sc was studied using optical microscopy (OM) and transmission election microscopy (TEM). It was found that intergranular corrosion and exfoliation corrosion of super-high strength Al alloy containing Sc were accelerated with prolonging the aging time, which were in accord with the results of polarization tests in 4.0 mol/L NaCl+ 0.1 mol/L HNO3+0.4 mol/L KNO3 (EXCO) solution. TEM observation shows that the size of precipitates at grain boundaries and the width of precipitate free zone (PFZ) at grain boundaries are the key factors responsible to the corrosion behavior of the alloy, As aging time was increased, η′ and S′ phases transformed into equilibrium η and S phases, and the size of η and S phases at grain boundaries and the width of PFZ were increased. The discontinuous distribution of the equilibrium phases at grain boundaries and the PFZ blocked the anodic tunnels of corrosion, which decreased the corrosion susceptibility of the alloys.
中图分类号 TG174.3
所属栏目 试验研究
基金项目
收稿日期 2011/4/18
修改稿日期
网络出版日期
作者单位点击查看
备注张海锋, 硕士研究生,
引用该论文: ZHANG Hai-feng,CHEN Qin. Influence of Aging Treatment on Intergranular Corrosion and Exfoliation Corrosion Susceptibility of Super-high Strength Al Alloy Containing Sc[J]. Corrosion & Protection, 2012, 33(2): 127
被引情况:
【1】马灿,谭澄宇,覃思思,李杰,蒋建辉, "时效对7056铝合金在EXCO溶液中剥落腐蚀行为的影响",腐蚀与防护 37, 93-99(2016)
共有人对该论文发表了看法,其中:
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】Heinz A, Haszler A. Recent development in aluminum alloys for aerospace applications[J].Mater Sci Eng A,2000,280:102-107.
【2】Hatch J E. Aluminum properties and physical metallurgy[M].Ohio:American Society for Metals,1984.
【3】尹志民, 潘清林, 姜锋. 钪和含钪合金[M]. 长沙: 中南大学出版社,2007.
【4】Davis J R. Corrosion of aluminum and aluminum alloys[M]. Ohio:American Society for Metals, Materials Park,1999.
【5】王月. 含钪铝合金的研究进展[J].上海金属,2003,25(1):36-40.
【6】戴晓元, 夏长青, 吴安如,等. 含钪超高强铝合金的研究现状及发展趋势[J].材料导报, 2006, 20(5):104-107.
【7】潘清林, 朱朝明, 李运春,等. 含钪Al-Cu-Li-Zr合金的抗晶间腐蚀和剥落腐蚀性能[J].材料保护, 2006,39(10):1-4.
【8】谭澄宇, 郑子樵, 潘颖,等. 剥落腐蚀对铝锂合金力学性能的影响[C]//长沙: 第二届全国铝锂合金研讨会论文集,1993:154-157.
【9】苏景新, 张昭, 曹发和,等. 铝合金晶间腐蚀与剥蚀[J].中国腐蚀与防护学报,2005,25(3):187-192.
【10】Buchheit P G, Morgan J P, Stoner G E. Electrochemical behavior of the T1(Al2CuLi) inter metallic compound and its role in localized corrosion of Al-2%Li-3%Cu alloys[J]. Corrosion,1994(50):120.
【11】Buchheit P G, Wall F D, Stoner G E. Anodic dissolution-based mechanism for the rapid cracking, preexposure phenomenon demonstrated by aluminum-lithium-copper alloys[J]. Corrosion,1995(15):417.
【12】李红英,曾再得.不同时效状态新型Al-Cu-Li系合金腐蚀的电化学阻抗谱[J]. 腐蚀与防护,2007,28(11):549-552.
【13】Robinson M J, Jackson N C. Exfoliation corrosion of high strength Al-Cu-Mg alloys: effect of grain structure[J]. Br Corros J,1999, 34(1):45-49.
【14】Kelly D J, Robinson M J. Influence of heat treatment and grain shape on exfoliation corrosion of Al-Li alloy 8090[J]. Corrosion,1993,49(10):787-795.
【15】Psada M, Murr L E, Niou C S,et al. Exfoliation and related in 2024 aluminum body skins on aging aircraft[J]. Materials Characterization,1997,38:259-272.
【16】刘继华, 李狄, 朱国伟,等. 7075铝合金应力腐蚀敏感性的SSRT和电化学测试研究[J]. 腐蚀与防护,2005,26(1):6-9.
【17】中国腐蚀与防护学会主编. 有色金属的耐腐蚀性及其应用[M]. 北京: 化学工业出版社, 1997.
【2】Hatch J E. Aluminum properties and physical metallurgy[M].Ohio:American Society for Metals,1984.
【3】尹志民, 潘清林, 姜锋. 钪和含钪合金[M]. 长沙: 中南大学出版社,2007.
【4】Davis J R. Corrosion of aluminum and aluminum alloys[M]. Ohio:American Society for Metals, Materials Park,1999.
【5】王月. 含钪铝合金的研究进展[J].上海金属,2003,25(1):36-40.
【6】戴晓元, 夏长青, 吴安如,等. 含钪超高强铝合金的研究现状及发展趋势[J].材料导报, 2006, 20(5):104-107.
【7】潘清林, 朱朝明, 李运春,等. 含钪Al-Cu-Li-Zr合金的抗晶间腐蚀和剥落腐蚀性能[J].材料保护, 2006,39(10):1-4.
【8】谭澄宇, 郑子樵, 潘颖,等. 剥落腐蚀对铝锂合金力学性能的影响[C]//长沙: 第二届全国铝锂合金研讨会论文集,1993:154-157.
【9】苏景新, 张昭, 曹发和,等. 铝合金晶间腐蚀与剥蚀[J].中国腐蚀与防护学报,2005,25(3):187-192.
【10】Buchheit P G, Morgan J P, Stoner G E. Electrochemical behavior of the T1(Al2CuLi) inter metallic compound and its role in localized corrosion of Al-2%Li-3%Cu alloys[J]. Corrosion,1994(50):120.
【11】Buchheit P G, Wall F D, Stoner G E. Anodic dissolution-based mechanism for the rapid cracking, preexposure phenomenon demonstrated by aluminum-lithium-copper alloys[J]. Corrosion,1995(15):417.
【12】李红英,曾再得.不同时效状态新型Al-Cu-Li系合金腐蚀的电化学阻抗谱[J]. 腐蚀与防护,2007,28(11):549-552.
【13】Robinson M J, Jackson N C. Exfoliation corrosion of high strength Al-Cu-Mg alloys: effect of grain structure[J]. Br Corros J,1999, 34(1):45-49.
【14】Kelly D J, Robinson M J. Influence of heat treatment and grain shape on exfoliation corrosion of Al-Li alloy 8090[J]. Corrosion,1993,49(10):787-795.
【15】Psada M, Murr L E, Niou C S,et al. Exfoliation and related in 2024 aluminum body skins on aging aircraft[J]. Materials Characterization,1997,38:259-272.
【16】刘继华, 李狄, 朱国伟,等. 7075铝合金应力腐蚀敏感性的SSRT和电化学测试研究[J]. 腐蚀与防护,2005,26(1):6-9.
【17】中国腐蚀与防护学会主编. 有色金属的耐腐蚀性及其应用[M]. 北京: 化学工业出版社, 1997.
相关信息