316L不锈钢双极板表面Cr-C涂层导电性和耐腐蚀性研究
首发时间:2018-10-18
摘要:使用电化学沉积方法在316L不锈钢表面沉积Cr-C薄膜作为质子交换膜燃料电池(PEMFC)双极板改性层。涂层使用XRD,SEM,EDS和电化学工作站进行成分、相组成以及改性双极板的导电、耐蚀等性能进行了分析测试。测试结果表明,316L不锈钢双极板的导电性与耐蚀性能因沉积Cr-C薄膜而显著提高,并且和制备镀层的电流密度密切相关:当电流密度从120mA/cm2增加到180mA/cm2时,腐蚀电流密度呈现抛物线性变化,电沉积电流密度为160mA/cm2时制备的涂层腐蚀电流密度最小,为0.020 μA/cm2,对应的接触电阻为10.8mΩocm2。改性后的316L不锈钢双极板具有优良的导电性和耐腐蚀性,与原始不锈钢相比,导电性能提高2个数量级以上,而耐蚀性能提高近3个数量级,可以在燃料电池环境中代替石墨板作为双极板使用。
关键词: 质子交换膜燃料电池 电沉积 不锈钢双极板 接触电阻 耐蚀性
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Study on Conductivity and Corrosion Resistance of Cr-C Coating on 316L Stainless Steel Bipolar Plate
Abstract:A Cr-C film was deposited on the surface of 316L stainless steel by electrochemical deposition as a proton exchange membrane fuel cell (PEMFC) bipolar plate modification layer. The modified bipolar plates coatings were analyzed and tested by XRD, SEM, EDS and electrochemical workstations for composition, conductivity and corrosion resistance. The test results show that the electrical conductivity and corrosion resistance of 316L stainless steel bipolar plates are significantly improved by the deposition of Cr-C film, and are closely related to the current density of the prepared coating. When the current density increases from 120 mA/cm2 to 180 mA/cm2, the corrosion current density exhibits a parabolic linear change. The coating prepared at 160 mA/cm2 has the lowest corrosion current density of 0.020 μA/cm2 and a corresponding contact resistance of 10.8 mΩocm2. Modified 316L stainless steel bipolar plate has excellent electrical conductivity and corrosion resistance. Compared with the original stainless steel, the electrical conductivity is improved by more than 2 orders of magnitude, and the corrosion resistance is improved by nearly 3 orders of magnitude. It can be used as a bipolar plate instead of a graphite plate in a fuel cell environment.
Keywords: proton exchange membrane fuel cell electrodeposition stainless steel bipolar plate contact resistance corrosion resistance
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316L不锈钢双极板表面Cr-C涂层导电性和耐腐蚀性研究
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