DOI:10.11973/fsyfh-202302011航空用6061铝合金恒载荷应力腐蚀行为何祯1,拜斌2,张小明1,孟嘉琳1(1.航空工业第一飞机设计研究院,西安710000;2.海军装备部驻西安地区军事代表局,西安710000)摘要:采用恒载荷全浸腐蚀拉伸、断口扫描和室温拉伸等方法研究了拉应力对两种热处理状态6061铝合金(6061-T4和6061-T6)应力腐蚀行为的影响。结果表明,在O2和Cl-共存环境中,6061-T4铝合金的应力腐蚀敏感性很低,力学性能降低主要受腐蚀介质的电化学腐蚀影响;6061-T6铝合金的应力腐蚀开裂敏感性高于6061-T4铝合金,其应力腐蚀开裂倾向受腐蚀影响为主,力学因素影响为辅;应力腐蚀后,6061-T4和6061-T6铝合金表层腐蚀区域为沿晶脆断,次表层为准解离断裂,中心为穿晶断裂;在腐蚀介质与应力同时作用下,6061-T4铝合金由点蚀发展为晶间腐蚀,并随应力增大变为剥落腐蚀;6061-T6铝合金点蚀不明显,但晶间腐蚀深度随应力增大而加深。关键词:6061铝合金;应力腐蚀;恒载荷;热处理状态中图分类号:TG172.2文献标志码:A文章编号:1005-748X(2023)02-0064-06StressCorrosionBehaviorof6061AluminumAlloyforAviationunderConstantLoadHEZhen1,BAIBing2,ZHANGXiaoming1,MENGJialin1(1.AVICTheFirstAircraftInstitute,Xi'an710000,China;2.TheNavalArmamentsDepartmentMilitaryRepresentativeOfficeinXi'anArea,Xi'an710000,China)Abstract:Theeffectoftensilestressonstresscorrosionpropertiesofaluminumalloyatdifferentheat-treatmentstates(6061-T4and6061-T6)werestudiedbymeansofconstantloadfullimmersioncorrosiontensile,fracturescanningandroomtemperaturetensilemethods.TheresultsshowedthatinthecoexistenceofO2andCl-,thestresscorrosionsensitivityof6061-T4aluminumalloywasverylow,andthedegradationofmechincalpropertieswasmainlyaffectedbytheelectrochemicalcorrosionofcorrosivemedium.Thestresscorrosioncrackingsensitivityofthe6061-T6aluminumalloywashigherthanthatofthe6061-T4aluminumalloy,andthestresscorrosioncrackingtendencyofthe6061-T6aluminumalloyweremainlyaffectedbycorrosionandsupplementedbymechanicalfactors.Thesurfacecorrosionareasofbothaluminumalloysafterstresscorrosionwereintergranularbrittlefracture,thesubsurfaceswerequasi-dissociativefracture,andthecentersweretransgranularfracture.Underthesimultaneousactionofcorrosive...
