Ag-IPMC物质组分变化及失效机理研究

Material Component Variation and Failure Mechanism Investigation of Ag-IPMC

摘要:

为了明确IPMC的失效机理，提高其使用寿命，以制备的Ag-IPMC为研究对象，对Ag-IPMC失效前、后的表面物质组分变化进行分析。采用能谱仪对选取的3处新制Ag-IPMC样件表面和5处失效Ag-IPMC样件表面进行能谱扫描，分析Ag-IPMC样件失效前、后其表面物质组分的变化规律，研究Ag-IPMC表面物质组分变化对运动失效的影响。结果表明：新制的Ag-IPMC样件的表面Ag镀层中几乎没有Ag的氧化物存在，并且Ag镀层的导电性能优良，为基膜内离子的交换提供稳定的电场环境；失效的Ag-IPMC样件表面Ag元素含量降低，在电流作用下镀层中的Ag与O和S发生反应，生成了氧化物和硫化物，使镀层结构产生类似于拉伸断裂的现象，从而增大了Ag-IPMC表面镀层的接触电阻，导致Ag-IPMC失效。

Abstract:

In order to identify the failure mechanism of the IPMC and prolong service life, researching the prepared Ag-IPMC to analyze the changes of surface chemical components before and after the failure of IPMC. Three parts of active Ag-IPMC surfaces and five inactive Ag-IPMC surfaces selected were spectroscopy scanned by EDS to analyze the change rules of surface chemical components before and after the failure of IPMC and study the influence of changes of surface chemical components on movement failure. Results indicate that there was no oxide of Ag in the clad layer of active Ag-IPMC surfaces, and the Ag clad layer had a fine electrical conductivity, which provided an environment of steady electric field for the ion exchange in inophragma; the Ag content of inactive Ag-IPMC surfaces decreased, and Ag in clad layer reacted with O and S under the function of current, which generated the oxides and sulfides, making the structure of clad layer generate the phenomenon similar to fracture, and the increase of contact resistance of Ag-IPMC surfaces leaded to the failure of Ag-IPMC.