粉末冶金材料科学与工程
粉末冶金材料科學與工程
분말야금재료과학여공정
POWDER METALLURGY MATERIALS SCIENCE AND ENGINEERING
2014年
2期
285-292
,共8页
江自然%肖海波%阳东方%刘宇尘%姚锐%郑峰
江自然%肖海波%暘東方%劉宇塵%姚銳%鄭峰
강자연%초해파%양동방%류우진%요예%정봉
双极板%质子交换膜燃料电池%聚苯胺涂层%防腐蚀%界面接触电阻
雙極闆%質子交換膜燃料電池%聚苯胺塗層%防腐蝕%界麵接觸電阻
쌍겁판%질자교환막연료전지%취분알도층%방부식%계면접촉전조
bipolar plates%proton exchange membrane fuel cell (PEMFC)%polyaniline coating%corrosion resistance%interfacial contact resistance (ICR)
将苯胺单体滴加到硫酸溶液中配制成电解液,采用恒电流法在304不锈钢板表面沉积聚苯胺涂层,通过动电位极化和恒电位极化分析不锈钢板的防腐性能,利用自制的导电性能测试设备分析涂层与不锈钢板的界面接触电阻,探讨聚苯胺涂层用于质子交换膜燃料电池双极板改性的可能性。结果表明,在优化工艺条件下制备的聚苯胺涂层的腐蚀电位和腐蚀电流密度分别为369 mV和0.479μA/cm2,与裸钢相比,腐蚀电位升高536 mV,腐蚀电流密度降低4个数量级。模拟质子交换膜燃料电池的实际工作环境进行恒电位极化曲线测试,分析测试后的溶液离子含量。结果表明,涂层改性不锈钢板的腐蚀电流密度比裸钢低2个数量级,具有很好的耐久性;阳极环境比阴极环境具有更强的腐蚀性。恒电位极化测试前,压力为1.4 MPa时,裸钢和涂层试样的界面接触电阻分别为97和145 m?·cm2,腐蚀后涂层试样的界面接触电阻比裸钢的低更多。用聚苯胺改性的不锈钢的防腐和导电性能在一定程度上都能达到目标值,在质子交换膜燃料电池双极板中具有很大的应用潜力。
將苯胺單體滴加到硫痠溶液中配製成電解液,採用恆電流法在304不鏽鋼闆錶麵沉積聚苯胺塗層,通過動電位極化和恆電位極化分析不鏽鋼闆的防腐性能,利用自製的導電性能測試設備分析塗層與不鏽鋼闆的界麵接觸電阻,探討聚苯胺塗層用于質子交換膜燃料電池雙極闆改性的可能性。結果錶明,在優化工藝條件下製備的聚苯胺塗層的腐蝕電位和腐蝕電流密度分彆為369 mV和0.479μA/cm2,與裸鋼相比,腐蝕電位升高536 mV,腐蝕電流密度降低4箇數量級。模擬質子交換膜燃料電池的實際工作環境進行恆電位極化麯線測試,分析測試後的溶液離子含量。結果錶明,塗層改性不鏽鋼闆的腐蝕電流密度比裸鋼低2箇數量級,具有很好的耐久性;暘極環境比陰極環境具有更彊的腐蝕性。恆電位極化測試前,壓力為1.4 MPa時,裸鋼和塗層試樣的界麵接觸電阻分彆為97和145 m?·cm2,腐蝕後塗層試樣的界麵接觸電阻比裸鋼的低更多。用聚苯胺改性的不鏽鋼的防腐和導電性能在一定程度上都能達到目標值,在質子交換膜燃料電池雙極闆中具有很大的應用潛力。
장분알단체적가도류산용액중배제성전해액,채용항전류법재304불수강판표면침적취분알도층,통과동전위겁화화항전위겁화분석불수강판적방부성능,이용자제적도전성능측시설비분석도층여불수강판적계면접촉전조,탐토취분알도층용우질자교환막연료전지쌍겁판개성적가능성。결과표명,재우화공예조건하제비적취분알도층적부식전위화부식전류밀도분별위369 mV화0.479μA/cm2,여라강상비,부식전위승고536 mV,부식전류밀도강저4개수량급。모의질자교환막연료전지적실제공작배경진행항전위겁화곡선측시,분석측시후적용액리자함량。결과표명,도층개성불수강판적부식전류밀도비라강저2개수량급,구유흔호적내구성;양겁배경비음겁배경구유경강적부식성。항전위겁화측시전,압력위1.4 MPa시,라강화도층시양적계면접촉전조분별위97화145 m?·cm2,부식후도층시양적계면접촉전조비라강적저경다。용취분알개성적불수강적방부화도전성능재일정정도상도능체도목표치,재질자교환막연료전지쌍겁판중구유흔대적응용잠력。
Polyaniline (PANI) coating was deposited on 304 stainless steel (SS) by galvanostatic method from aqueous solutions of aniline and sulfuric acid. The properties of PANI coating were tested to study its feasibility used for bipolar plates of proton exchange membrane fuel cell (PEMFC). Potentiodynamic and potentiostatic tests were conducted to investigate its corrosion resistance. The present author’s home-made electrical conductivity testing equipment was used to examine its interfacial contact resistance (ICR). Potentiodynamic test results showed that the corrosion potential for PANI coated SS prepared at optimal condition was 369 mV, which was 536 mV higher than that of the bare one. And its corrosion current density was 0.479μA/cm-2, four orders of magnitude less than that of the bare one. Potentiostatic tests in simulated PEMFC environments were conducted and the metal ion content in the testing solutions was analyzed. Results show that corrosion current density for PANI coated SS is two orders of magnitude less than that of the bare one, indicating that PANI coated SS has higher chemical stability. The anode condition is more corrosive than the cathode one. ICRs of bare and coated SS were 97 and 145 m?·cm2 at 1.4 MPa before potentiostatic tests, respectively. After potentiostatic tests, PANI coated sample exhibited lower ICR than the bare one. Therefore, PANI coated SS has a great potential of application in bipolar plates of PEMFC as its corrosion resistance and conductivity may satisfy the properties targets of metallic bipolar plates to some extent.