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1、物理化學(xué)學(xué)~(WuliHuaxueXuebao)MarchActaP一Chim.Sin.2011,27(3),655—663655[Article]www.whxb.pku.edu.cn咪唑離子液體對(duì)銅在硫酸溶液中的緩蝕作用張啟波華一新(昆明理工大學(xué)冶金-5能源工程學(xué)院,離子液體冶金重點(diǎn)實(shí)驗(yàn)室,昆明650093)摘要:采用動(dòng)電位極化和電化學(xué)阻抗譜技術(shù)研究了三種新型烷基咪唑離子液體,1-丁基-3一甲基咪唑硫酸氫鹽([BMIM]HSO),1.已基.3.甲基咪唑硫酸氫鹽([HMIMIHSO),1-辛基-3-甲基咪唑硫酸氫鹽([OMIM]HSO),對(duì)
2、銅在O.5mo1.L~HSO溶液中的緩蝕作用.實(shí)驗(yàn)結(jié)果表明:咪唑離子液體能有效抑制銅在硫酸溶液中的腐蝕,相同濃度下的緩蝕效率大小順序?yàn)閇OMIM]HSO>[HMIM]HSO>[BMIM]HSO.動(dòng)電位極化表明三種咪唑化合物的加入對(duì)銅的陰陽(yáng)極腐蝕過程均有抑制作用,屬于混合型緩蝕劑.電化學(xué)阻抗譜用帶兩個(gè)常相位原件的等效電路對(duì)含兩個(gè)時(shí)間常數(shù)的體系進(jìn)行擬合,發(fā)現(xiàn)咪唑化合物的添加會(huì)引起電荷傳遞電阻和雙電層電容等阻抗參數(shù)的變化,表明此類化合物通過吸附于銅電極與溶液界面起到緩蝕作用,且這種吸附符合Langmuir吸附等溫關(guān)系.吸附過程熱力學(xué)計(jì)算說明咪唑化合
3、物在銅表面發(fā)生了自發(fā)的物理吸附.關(guān)鍵詞:緩蝕劑:咪唑離子液體:銅:動(dòng)電位極化:電化學(xué)阻抗譜中圖分類號(hào):0646EfectofAlkylimidazoliumIonicLiquidsontheCorrosionInhibitionofCopperinSulfuricAcidSolutionZHANGQ..BoHUAYi.Xin(KeyLaboratoryoflonieLiquidsMetallurgy,FacultyofMetallurgicalandEnergyEngineering,KunmingUniversityofScienceand
4、Technology,Kunming650093,PR.China)Abstract:TheefectsofthreenewlysynthesizedalkylimidazoliumbasedionicIiquids:1-butyl-3-methylimidazoliumhydrogensulfate([BMIM]HSO4),1-hexyl-3-methylimidazoliumhydrogensulfate([HMIM】HSO4),and1-octyI-3一methylimidazoliumhydrogensulfate([OMIM]HSO
5、4),onthecorrosioninhibitionofcopperin0.5mol·L~H2SOsolutionwereinvestigatedusingpotentiodynamicpolarizationandelectrochemicaIimpedancespectroscopy.AlIthemeasurementsshowthatthesealkylimidazoliumionicIiquidsareexcelentinhibitorsforcopperinsulfuricacidmediaandtheeffectivenesso
6、ftheseinhibitorsdecreasesasfoIlows:『OMlM]HSO4>『HMlM]HSO4>『BMlM]HSO4atthesameconcentration.Potentiodynamicpolarizationstudiesindicatethatthethree{nhibitorsaremixedtypeinhibitorsandthatboththecathodicandanodicprocessesofcoppercorrosionaresuppressed.Theelectrochemicalimpedance
7、resultswereevaluatedusinganequivalentcircuitinwhichtwoconstantphaseelements(CPE)wereoferedforthesesystemswithtwotimeconstants.Changesinimpedanceparameters(chargetransferresistanceanddoubleIayercapacitance)withtheadditionoftheinhibitorsalsosuggestthattheseimidazoliumbasedmol
8、eculesactbyadsorbingatthecOpper/s0IutlOninterface.Theadsorptionoftheseimidazoliumb