全浸腐蚀条件下溶液pH对2A12-T4铝合金剥蚀的影响
Effect of Solution pH on Exfoliation Corrosion of 2A12-T4 Aluminum Alloy under Full-Immersion Corrosion Condition
摘 要
以EXCO标准溶液(pH为0.4)为基础,通过改变溶液pH为1和2,研究了全浸腐蚀条件下溶液pH对2A12-T4铝合金剥蚀行为的影响规律和机理。结果表明:随着溶液pH增加,试样在腐蚀初期的质量减少和腐蚀后期的质量增加幅度均明显降低,剥蚀程度明显减弱,且由全面剥蚀转变成局部剥蚀。试样在不同pH溶液中的截面剥蚀扩展特征基本相同。在pH=1的试验溶液中,试样经过192 h腐蚀后,其剥蚀扩展区的晶间腐蚀特征与海南万宁自然环境试验站7 a的非常相近,且均为局部剥蚀。在研究铝合金的大气局部剥蚀时,建议全浸溶液pH取1。
剥蚀
铝合金
大气剥蚀
solution pH
exfoliation corrosion
aluminum alloy
atmospheric exfoliation corrosion
Abstract
EXCO standard solution (pH 0.4) was used as the basic solution, and the influence of solution pH on the exfoliation corrosion behavior of 2A12-T4 aluminum alloy under full immersion corrosion conditions was studied by changing the solution pH to 1 and 2. The results showed that with the increase of solution pH, the mass reduction of samples at the initial stage of corrosion and the mass increment at the later stage of corrosion were significantly reduced, the degree of exfoliation corrosion was significantly weakened, and the overall exfoliation corrosion was transformed to localized exfoliation corrosion. The exfoliation corrosion propagation characteristics on the cross section of samples in the solutions with different pH were basically the same.In the test solution with pH=1, after 192 h of corrosion, the intergranular corrosion characteristics of the denuded extension zone of the sample were very similar to those in Hainan Wanning Natural Environment Test Station for 7 years, and they were all localized exfoliation corrosion.
中图分类号 TG172 DOI 10.11973/fsyfh-202301003
所属栏目 试验研究
基金项目 陕西省自然科学基础研究计划(2018JQ5012)
收稿日期 2021/1/25
修改稿日期
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引用该论文: ZHANG Sheng,HE Yuting,NI Bo,YAN Yong,CUI Changjing. Effect of Solution pH on Exfoliation Corrosion of 2A12-T4 Aluminum Alloy under Full-Immersion Corrosion Condition[J]. Corrosion & Protection, 2023, 44(1): 12
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【2】KETCHAM S J,SHAFFER I S. Exfoliation corrosion of aluminum alloys[M]//Localized Corrosion-Cause of Metal Fatigue.100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959:ASTM International:3-3-14.
【3】LIAO M,RENAUD G,BELLINGER N C. Fatigue modeling for aircraft structures containing natural exfoliation corrosion[J]. International Journal of Fatigue,2007,29(4):677-686.
【4】ZHANG S,ZHANG T,HE Y T,et al. Long-term atmospheric corrosion of aluminum alloy 2024-T4 in coastal environment:surface and sectional corrosion behavior[J]. Journal of Alloys and Compounds,2019,789:460-471.
【5】苏景新. 铝锂合金剥蚀研究和分形维数在表征腐蚀中的应用[D]. 杭州:浙江大学,2006.
【6】曹发和. 高强度航空铝合金局部腐蚀的电化学研究[D]. 杭州:浙江大学,2005.
【7】陈素晶. 航空铝合金大气腐蚀的模拟研究[D]. 南京:南京航空航天大学,2005.
【8】孙祚东. 军用飞机典型铝合金结构腐蚀损伤规律及加速腐蚀试验方法研究[D]. 哈尔滨:哈尔滨工程大学,2005.
【9】苏景新,张昭,曹发和,等. 铝合金的晶间腐蚀与剥蚀[J]. 中国腐蚀与防护学报,2005,25(3):187-192.
【10】LEE S,LIFKA B W. Modification of the EXCO test method for exfoliation corrosion susceptibility in 7XXX,2XXX,and aluminum-lithium alloys[M]//New Methods for Corrosion Testing of Aluminum Alloys.100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959:ASTM International,1-1-19.
【11】李涛. 铝合金在西沙大气环境中早期腐蚀行为与机理研究[D]. 北京:北京科技大学, 2009.
【12】杨少华,刘增威,林明,等. 7075铝合金在不同pH值NaCl溶液中的腐蚀行为[J]. 有色金属科学与工程,2017,8(4):7-11.
【13】张海永,孟宪林,孙东明,等. pH值对5083铝合金腐蚀行为的影响[J]. 山东化工,2015,44(15):37-41.
【14】孔小东,汪俊英. pH对Al-Mg合金电化学腐蚀行为的影响[C]//第十八届全国缓蚀剂学术讨论及应用技术经验交流会. 成都:[出版者不详],2014.
【15】HUANG I W,HURLEY B L,YANG F,et al. Dependence on temperature,pH,and Cl- in the uniform corrosion of aluminum alloys 2024-T3,6061-T6,and 7075-T6[J]. Electrochimica Acta,2016,199:242-253.
【16】孙霜青,郑弃非,李德富,等. LY12铝合金的长期大气腐蚀行为[J]. 中国腐蚀与防护学报,2009,29(6):442-446.
【17】曹楚南. 中国材料的自然环境腐蚀[M]. 北京:化学工业出版社,2005.
【18】LIU Y R,PAN Q L,LI H,et al. Revealing the evolution of microstructure,mechanical property and corrosion behavior of 7A46 aluminum alloy with different ageing treatment[J]. Journal of Alloys and Compounds,2019,792:32-45.
【19】ROBINSON M J. The role of wedging stresses in the exfoliation corrosion of high strength aluminium alloys[J]. Corrosion Science,1983,23(8):887-899.
【20】于美,刘建华,李松梅. 航空铝合金腐蚀防护与检测方法[M]. 北京:科学出版社,2017.
【21】杨振海,徐宁,邱竹贤. 铝的电位-pH图及铝腐蚀曲线的测定[J]. 东北大学学报,2000,21(4):401-403.
【22】LAMPEAS N,KOUTSOUKOS P G. The importance of the solution pH in electrochemical studies of aluminum in aqueous media containing chloride[J]. Corrosion Science,1994,36(6):1011-1025.
【23】宋诗哲,唐子龙. Al-Mg合金在不同pH值的NaCl溶液中的腐蚀行为[J]. 腐蚀科学与防护技术,1995,7(3):218-229.
【24】李晓刚. 材料腐蚀与防护概论[M]. 2版.北京:机械工业出版社,2017.
【25】KEDDAM M,KUNTZ C,TAKENOUTI H,et al. Exfoliation corrosion of aluminium alloys examined by electrode impedance[J]. Electrochimica Acta,1997,42(1):87-97.
【26】CAO F H,ZHANG Z,LI J F,et al. Exfoliation corrosion of aluminum alloy AA7075 examined by electrochemical impedance spectroscopy[J]. Materials and Corrosion,2004,55(1):18-23.
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