Potential Fluctuations of 7075 Aluminum Alloy under Thin Electrolyte Layers

Authors

Su-jing CHEN, 1) ,YUAN Qing-ming~(2), HE Jian-ping~(1),LIU Xiao-lei~(1)( College of Material Science and Technology of Nanjng University of Aeronauticsand Astronautics, Nanjing, 210016,China,2.Xiamen Airlines Ltd. Xiamen 361009, China;

Abstract

Lens tissues adsorbing 3.5% sodium chloride solution were used to simulate thin electrolyte layers. The 7075 aluminum alloy was immersed under the thin electrolyte layers for 0, 4, 6, 8 and 12 h respectively. Then the fluctuations of natural-corrosion potentials of the alloy were monitored. The fluctuations of natural-corrosion potential were observed rather small in the initial corrosion stages after 6h immersion, and the positive peaks of potential appeared. However the amplitudes reached 20mV after 4h and 12h immersion. The RMS of natural-corrosion potentials decreased with corrosion time at first and then increased. It reached a minimum at 4 h. The k value (slope of linear part) was rather high at 6h. Thus it can conclude from above that the initiation of pitting happened after 6h corrosion.

Keywords

Aluminum alloy, Thin electrolyte layers, Potential fluctuations, Pitting

DOI Link

https://doi.org/10.61558/2993-074X.1634

Publication Date

2005-05-28

Online Available Date

2005-05-28

Revised Date

2005-05-28

Received Date

2005-05-28

Recommended Citation

Su-jing CHEN. Potential Fluctuations of 7075 Aluminum Alloy under Thin Electrolyte Layers[J]. Journal of Electrochemistry, 2005 , 11(2): 167-171.
DOI: 10.61558/2993-074X.1634
Available at: https://jelectrochem.xmu.edu.cn/journal/vol11/iss2/10

References

[1]PyunSL,MoonSM,LeeEJ.Effectofelectrolytelay erthicknessonatmosphericcorrosionofAl1Si0.5Cu[J].BritishCorrosionJournal,1994,29(3):190～193.
[2]ChengYL,ZhangZ,CaoFH.Astudyofthecorro sionofaluminumalloy2024T3underthinelectrolyte layers[J].CorrosionScience,2004,8:1～18.
[3]YamashitaM,NaganoH,OrianiRA.Dependenceof corrosionpotentialandcorrosionrateofalow alloysteel upondepthofaqueoussolution[J].CorrosionScience,1998,39(8):1447～1453.
[4]PugetY,TretheweyK,WoodRJK.Electrochemical noiseanalysisofpolyurethane coatedsteelsubjectedto Erosion corrosion[J].Wear,1999,233～235:552～567.
[5]LiJF(李劲风),ZhangZ(张昭),ChengYL(程英亮).ElectrochemicalfeaturesofthecorrosionofAlumi num Lithiumalloyin3.0%NaClsolution[J].Acta MetallurgicaSinica,2002,38(7):760～764.
[6]LinHC(林海潮),CaoCN(曹楚南).Astudyof electrochemicalnoisesduringpittingcorrosionofironin neutralsolutions[J].J.ChineseSocietyforCorrosion andProtection.1985,6(2):141～148.
[7]ChengYF,WilmottM,LuoJL.Analysisoftheroleof electrodecapacitanceontheinitiationofpitforA516carbonsteelbyelectrochemicalnoisemeasurements[J].CorrosionScience,1999,41:1245～1256.
[8]HadkyK,DawsonJL.Themeasurementofcorrosionu singelectrochemical1/fnoise[J].CorrosionScience,1982,22:231～237.
[9]JanuszS,KazimierzD,ArturZ.Pittingcorrosionin steelandelectrochemicalnoiseintensity[J].Electro chemistrycommunication,2002,(4):388～391.
[10]ZhangZ(张昭),ZhangJQ(张鉴清),WangJM(王建明).Featureofelectrochemicalnoiseduringpitting corrosionof2024T3aluminumalloyin3.0%Na2SO4solution[J].Trans.NonferrousMet.Soc(inChina).2001,11(2):284～287.
[11]XuNX(徐乃欣),ZhangCD(张承典),DingCH(丁翠红).Anewapproachtoaccelerateatmospheric corrosiontest[J].J.ChineseSocietyforCorrosion andProtection,1990,10(3):228～232.
[12]MinhuaS,YanF,RongGH.Astudyonpittingcor rosionofaluminumalloy2024T3byscanningmicrore ferenceelectrodetechnique[J].MaterialsScienceand Engineering,2003,A344:323～327.
[13]FlisJ,DawsonJL,GillJ.Impedanceandelectro chemicalnoisemeasurementonironandiron carbon alloysinhotcausticsoda[J].CorrosionScience,1991,32(8):877～892.
[14]UruchurtuJC,DawsonJL.Noiseanalysisofpurea luminumunderdifferentpittingconditions[J].Corro sion,1987,43:19～25.