Cr元素对6061铝合金腐蚀行为及腐蚀损伤敏感性的影响

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中图分类号：TG146.21 文献标志码：B DOI：10.19710/J.cnki.1003-8817.20250260

TheInfluence of Cr Element on the Corrosion Behavior and Corrosion Damage Sensitivity of 6061 Aluminum Alloy

Mao Pei 1 ，Wu Zibin'，Feng Zhixin'，Chen Wanjie'，Hiromi Nagaumi 1 ， Zhang Bo² （1.InstituteofHghPerformanceMetalStructuralMaterials，SoochowUniversituzhou5ooo;2.ChinaHongqiaoGoupotd. Binzhou 256600）

Abstract：Toclarify the influenceof Cr content on the microstructure，mechanical properties and intergranular corrosionbehaviorof 6O61aluminumalloy，Scanning Electron Microscopy（SEM），Electron BackscateredDifraction （EBSD），Optical Microscopy（OM），TransmisionElectron Microscopy （TEM），aswellastensileand intergranular corrosion testsare adopted.The results show that the Cr element promotes the transformation of the β -AlCrSi phase in the as-cast state towards the β -Al（CrFe）Si phase，and after the two-stage homogenization treatment，a large amount of submicron-sized α -Al（CrFe）Si dispersed phase is formed near thegrain boundaries.With the increaseof Cr content， thedensityof thedispersed phasegradually increases，and thegrainsareeffctivelyrefined.Inaddition，Cr significantly enhanced the intergranularcorrosionresistance of 6O6l aluminum alloyandreduced the damage sensitivity of mechanical properties in corrosive environments.Among them，thealloy containing 0.15% Crexhibited the best comprehensive performance，with a tensile strength exceeding 260MPa under normal conditions.After 24 h of pre-corrosion，the performance deerease is only about 2.3% ，

Keywords：Cr intergranular corrosion， αααα -Al（CrFe）Si dispersoids，Corrosion damage

1前言

合金，具有高比强度和优良的成形性能，广泛应用于航空航天、轨道交通和汽车工业等领域[-2]，其强度主要来源于时效析出的 β′′（Mg5Si6） 等强化相[3]。（剩余12253字）