离子膜电解槽阳极阴极涂层 IEM Anode Cathode Coating

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1、DeNoraWorldLeaderinElectrochemicalScience,TechnologyandNewMarkets’Applications1°UHDENORA-DENORAChlorineSymposiumSuzhouMarch2008IEMAnodeandCathodeCoatingOperation离子膜电解阴极和阳极涂层March08AGENDA要讨论的话题2ImportanceofCoatings.涂层的重要性CausesofCoatingFailure.涂层失效的原因HowMaintaingoodcoatingperformancesallalon

2、gtheguaranteedlife.在寿命保证期内，如何保持好的涂层性能MeasuringtheResidualcoatingload.检测剩余的涂层Measuringcoatingandmembraneconditionduringtheoperation.在电槽操作期间，检测涂层及膜的状况March08ImportanceofCoatings涂层的重要性3AgoodAnodecoating:好的阳极涂层VKeepsyourplantinbusiness,withaveryflatcellvoltageprofileover8years.可在保证期八年时间内，维持平稳的电

3、槽电压。AgoodCathodecoating:好的阴极涂层VReduceshydrogenovervoltagebymorethan200mVoverbarenickel.相对于无涂层的镍，阴极涂层可降低氢过电位200mV以上March08ImportanceofCoatings涂层的重要性4ABadAnodeCoating:坏的阳极涂层VWillcauseaverysharpvoltageincreaseinashortperiodoftimeuptothepointwhereplanthastobeshutdown.可在短时间内造成槽电压迅速上升，直至使电槽被迫停车AB

4、adCathodecoating:坏的阴极涂层VWillcauseaquickincreaseofthecellvoltageofabout100/150mV:every100mVincreaseisequivalentto~3%increaseinpowercost.会导致槽电压快速上升100~150mV;槽电压上升100mV,电耗约增3%CausesofAnodeandCathodeCoatingFailure阴、阳极涂层失效的原因CausesofAnodecoatingfailureMarch086阳极涂层失效的原因Anodecoatingfailurecanbecau

5、sedbysomeimpuritiespresentinthefeedbrinesuchas:盐水中的一些杂质会导致阳极涂层失效Fluoride:PartspermillionlevelsinbrinewillstriptheDSA®coatingstobareTiinhours.氟：盐水中ppm级的氟也会在数小时内使涂层脱落Manganese:WillcoverexistingDSA®catalystwithpseudo-catalyticcoatingwhichisalmostimpossibletoremove.锰：会覆盖掉阳极活性涂层，形成一层伪涂层，且几乎不可能除去

6、Barium/Strontium/Silica:Formtenaciousdepositswhichareverydifficulttoremove.钡/锶/硅：会沉积在活性涂层表面，且很难除去CausesofAnodecoatingfailureMarch087阳极涂层失效的原因Otherpossiblereasonofanodecoatingfailureare:其它可能导致阳极涂层失效的因素：Causticback-migration:碱的反向迁移VOH-ionback-migrationthroughmembranescratch.-OH离子通过膜的划伤部位反向迁移V

7、OH-ionback-migrationthroughmembranepinhole.-OH离子通过膜上的小孔反向迁移VTearinthemembrane.-OH离子通过撕裂的膜反向迁移Normalcoatingageing:正常的涂层的老化VOccursafteryearsofanodeservice.使用数年后，涂层会渐渐老化VDifficulttodetect.这种情况很难探测VRequiresregeneration(recoating)ofthesubstrateormeshreplaceme