Sc对Al-3Cu-1Li合金显微组织和电化学腐蚀行为的影响.pdfVIP

HoWorkingTechnology2020,Vol.49,No.6

Sc对Al-3Cu-lLi合金显微组织

和电化学腐蚀行为的影响

雷雨浓，王赫男，鄂顺，王金涛

(沈阳航空航天大学材料科学与工程学院，辽宁沈阳110136)

摘要：用真空熔炼炉制备Al-3Cu-1Li-xSc(x=0,0.1%,0.3%和0.5%)合金，观察合金的显微组织，测量合金的维氏

硬度。在O.lmol/LNaCl溶液中，用开路电位(OCP)、极化曲线、电化学阻抗谱(EIS)和Mo-Schoky曲线研究了Sc对

Al-3Cu-lLi合金腐蚀行为的影响。结果表明：Sc细化了合金的显微组织，提高了合金硬度；Sc添加后未改变合金的电化

学腐蚀机制，该合金热力学稳定性提高的同时耐蚀性有所降低；该合金的耐蚀性与其腐蚀产物膜的载流子密度高低具

有相关性。

关键词：铝铜锂合金；稀土Sc；显微组织；电化学腐蚀

DOI:10.14158/j.cnki.1001-3814.

中图分类号:TGI46.21；TG172.5文献标识码：A文章编号:1001-3814(2020)6-0058-04

EffectofSconMicrostructureandElectrochemicalCorrosionBehavior

ofAl-3Cu-lLiAlloy

LEIYunong,WANGHenan,EShun,WANGJintao

(SchoolofMaterialsScienceandEngineering,ShenyangAerospaceUniversity,Shenyang110136,China)

Abstract:Al-3Cu-lLi-xSc(^=0,0.1%,0.3%,0.5%)alloyswerepreparedbyvacuummeltingfurnace,andthe

microstructureofthealloywasobservedandtheVickershardnesswasmeasured.In0.lmol/LNaClsolution,theeffectsofSc

onthecorrosionbehaviorofAl-3Cu-lLialloywerestudiedbyopencircuipotential(OCP),potentiodynamicpolarization,

electrochemicalimpedancespectroscopy(EIS)andMo-Schokymethod.TheresultsshowthaScrefinesthemicrostructure

ofthealloysandimprovethehardnessofthealloy.Theelectrochemicalcorrosionmechanismofthealloysdoesnochange

afterScaddition,buthecorrosionresistanceofthealloydecreasesanditsthermodynamicstabilityofthealloyimproves.The

corrosionresistanceofthealloysisrelatedtothecarrierdensitiesofthecorrosionproducfilm.

Keywords:aluminum-copper-lithiumalloy;rareearthSc;m