采用熔盐电沉积法在W、Mo、Re基体表面分别制备了Ir涂层,通过扫描电镜和能谱分析了涂层的形貌和成分,对比研究了W、Mo、Re在熔盐电沉积Ir涂层过程中的性质。结果表明：W和Mo在氯化物熔盐体系中腐蚀严重,电沉积后在基体和涂层之间形成了含有腐蚀产物的夹盐层,大大降低了涂层和基体之间的结合力,在热应力和外力的作用下涂层易产生裂纹和剥落。Re在氯化物熔盐体系中稳定性好,在氯化物熔盐体系中不发生腐蚀,电沉积后在基体和涂层之间无夹盐层形成,基体和涂层结合良好,电沉积所得Ir涂层致密、完整,没有裂纹和孔洞等缺陷。
The iridium coatings were prepared on the surfaces of molybdenum,tungsten and rhenium substrates by electrodeposition in molten salts of chlorides.The microstructures,compositions and phase constituents of the coatings were investigated by scanning electron microscopy（SEM） and energy-dispersive X-ray spectrometry（EDX）.Characteristics of molybdenum,tungsten and rhenium substrates during electrodeposition were studied.The results indicated that molybdenum and tungsten were severely corroded in molten salts of chlorides,interlayers composed of chlorides and corrosion products were formed after electrodeposition,which greatly reduced the binding force between the coating and substrate,and the iridium coatings fractured easily.However,rhenium has a good stabilization in chlorides.No corrosion was found during electrodeposition,there is no interlayer formed,and the iridium coating and rhenium substrate immediately combined,a dense and smooth iridium coating was obtained on the rhenium substrate.
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