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时间:2019-02-04
《烯胺阻锈剂对钢筋在模拟碳化混凝土孔隙液中的点蚀抑制》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、物理化学学~(WuliHuaxueXuebao)AprilActaP.一Chim.Sin.2011,27(4),905-912905[Article】www.whxb.pku.edu.cn烯胺阻锈剂对钢筋在模拟碳化混凝土孑L隙液中的点蚀抑制董泽华朱涛石维郭兴蓬(华中科技大学化学与化工学院,武汉430074)摘要:通过电化学噪声(ECN)、电化学阻抗(EIS)及极化曲线研究了四乙烯五胺(TEPA)在碳化模拟混凝土孔隙液中对Q345B碳钢点蚀的抑制机理.结果表明:通过吸附成膜和隔离Cr离子对钝化膜的侵蚀,TEPA浓度升高导致碳钢点蚀电位正移.低浓度的TEPA会造
2、成亚稳态蚀点形核速率略微增加,但会降低其寿命.随着TEPA浓度增加,噪声电阻上升,而亚稳态蚀点寿命和平均点蚀电量则迅速下降,表明其明显加速了亚稳态蚀点修复,当TEPA浓度达0.10mol·L时,噪声峰消失,基底电流趋于零,蚀点全面钝化.TEPA不仅能抑制CI一离子引起的亚稳态和稳态蚀点生长,还可吸附于钝化膜表面,抑制膜的均匀溶解.形貌观察表明,亚稳态蚀点主要在稳态蚀点周围形核和生长,并不断为稳态蚀点所吞并,造成碳钢表面蚀坑一般沿平面而不是垂直方式扩展.关键词:碳钢:点蚀:缓蚀剂:混凝土孔隙液:电化学噪声中图分类号:0646;TG174.42Inhibitio
3、nofEthyleneamineonthePittingCorrosionofRebarinaSyntheticCarbonatedConcretePoreSolutionDONGZe—Hua。ZHUTaoSHIWeiGUOXing—Peng(SchoolofChemistryandChemicalEngineering,HuazhongUniversityofScienceandTechnology,Wuhan430074,PR.China)Abstract:Tetraethylenepentamine(TEPA)wassurveyedtoshowstro
4、nginhibitiononpittingcorrosionofQ345Bcarbonsteelinacarbonatedsyntheticporesolution(SPS)byelectrochemicaInoise(ECN),electrochemicalimpedancespectroscopy(EIS),andpolarizationcurves.ThepittingcorrosionpotentialshiftspositivelywithanincreaseintheTEPAconcentration.ECNdatashowthattheIOWc
5、ontentofTEPAcanincreasethenucleationrateofthemetastablepitsslightlyandcaneffectivelyreducetheirlifespan.Thehighcontent(0.10mo1.L)ofTEPAacceleratestherepassivationofmetastablepittingandthisiSaccompaniedbyanincreaseinnoiseresistanceandadecreaseinthenucleationrateandaveragepittingchar
6、geuntiIthenoisecurrenttransientsdisappearcompletely.BoththebaselinecurrentandtheamplitudeofthecurrenttransientsdecreasewithanincreaseintheTEPAconcentration.indicatingthatTEPAretardsnotonlythepittingcorrosionbutalsothegeneraldissolutionofthepassivef¨m.Micrographsshowthatthemetastabl
7、epitsmainlyinitiateanddeveloparoundthestablepitsbecauseoftheinductionofcorrosionproducts,whichcausesthepitingcavityoncarbonsteeltogrowgenerallyinaplanarratherthaninaperpendicuIardirection.KeyWords:Carbonsteel;Pittingcorrosion;Inhibitor;ConcreteporesolutionElectrochemicalnoiseReceiv
8、ed:September26,2010;Revise
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