Interfacial tension between liquid Al and molten fluoride salt was determined using sessile drop method combined with X-ray radiograph.A computer program of curve-fitting for coordination of configuration of sessile d...Interfacial tension between liquid Al and molten fluoride salt was determined using sessile drop method combined with X-ray radiograph.A computer program of curve-fitting for coordination of configuration of sessile drop was used in the picture processing of the sessile drop.Regressive equation were worked out to calculate the density of the molten salt.The in- fluence of mole ratio of NaF/AlF_3,content of Li_2CO_3 and rare-earth oxides in the molten salt on interfacial tension of Al-salt was discussed.The contact angles of liquid Al on the sur- face of graphite,graphitized carbon cathode and the graphite with coating of TiB_2 were de- termined.展开更多
氯化物盐作为光热发电(concentrating solar power,CSP)传储热介质,可以显著提升其发电效率、降低发电成本。然而,氯化物熔盐对结构材料具有强烈的腐蚀性,限制了它的应用,因此开发耐氯化物熔盐腐蚀合金及涂层材料显得尤为重要。通过研究...氯化物盐作为光热发电(concentrating solar power,CSP)传储热介质,可以显著提升其发电效率、降低发电成本。然而,氯化物熔盐对结构材料具有强烈的腐蚀性,限制了它的应用,因此开发耐氯化物熔盐腐蚀合金及涂层材料显得尤为重要。通过研究310S钢在高温氯化物熔盐中的腐蚀行为及腐蚀动力学,可以揭示其在氯化熔盐中的失效机制;同时利用包埋渗铝技术在其表面制备Fe-Al涂层,并采用扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射仪(X-ray diffraction,XRD)、能谱仪(energy dispersive spectroscopy,EDS)等表征方法,研究不同腐蚀时间对310S钢微观组织、物相组成的影响,以及Fe-Al涂层在氯化物熔盐中的耐腐蚀性能。结果表明,310S钢在高温氯化物熔盐中,其质量损失和腐蚀速率均随着腐蚀时间的延长而增大,腐蚀300 h时腐蚀速率达到最大,约为5852.72μm/a,此时,2 mm厚的钢板被腐蚀穿透。腐蚀400 h,腐蚀速率稍有降低,但基体内部灌入大量熔盐从内部腐蚀,钢基体腐蚀失效。Fe-Al涂层在高温氯化熔盐中腐蚀400 h,表面形成厚度约为40μm的氧化层,并呈多层结构,从外到内依次为MgO、Mg(Al,Cr)_(2)O_(4)、Al_(2)O_(3),内层的Al_(2)O_(3)层连续致密,且与涂层结合牢固,起到主要防护作用;其腐蚀速率约为264μm/a,为未渗铝钢同等条件下腐蚀速率(5713μm/a)的1/22,显著提升了310S钢的耐氯化熔盐腐蚀性能。分析表明,310S钢在高温氯化物熔盐中基本没有抵抗腐蚀的能力,但通过包埋渗铝技术在其表面制备Fe-Al防护涂层,可有效提升其耐氯化物熔盐腐蚀性能,使其作为结构材料在下一代CSP储热装置中的应用成为可能。展开更多
文摘Interfacial tension between liquid Al and molten fluoride salt was determined using sessile drop method combined with X-ray radiograph.A computer program of curve-fitting for coordination of configuration of sessile drop was used in the picture processing of the sessile drop.Regressive equation were worked out to calculate the density of the molten salt.The in- fluence of mole ratio of NaF/AlF_3,content of Li_2CO_3 and rare-earth oxides in the molten salt on interfacial tension of Al-salt was discussed.The contact angles of liquid Al on the sur- face of graphite,graphitized carbon cathode and the graphite with coating of TiB_2 were de- termined.
