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首页> 外文期刊>Materials at High Temperatures >Comparison between oxidation of Fe-Cr-Al sputter coatings in air and air-HCl environments at 550 degrees C
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Comparison between oxidation of Fe-Cr-Al sputter coatings in air and air-HCl environments at 550 degrees C

机译：空气和HCl环境中550°C时Fe-Cr-Al溅射涂层氧化的比较

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In biomass fired power plants the superheaters and reheaters are known to be particularly susceptible to chloride induced fireside corrosion. One approach to giving them longer lives is to develop new coatings that are resistant to this type of fireside corrosion damage. This paper reports the initial stages of such an approach using the combinatorial model alloy development method. Physical vapour deposition (PVD) using a two-target magnetron sputtering system (99.95 wt-%Cr and Fe-30 wt-%Al) has been used to obtain a range of coating compositions. The coatings were deposited onto an array of sapphire discs (10 mm diameter; 3 mm thick) placed in front of the targets. This resulted in a group of samples with coatings with a range of different Cr to Fe/Al ratios, which have been characterised using scanning electron microscopy/energy dispersive X-ray analysis (SEM/EDX) and X-ray diffraction (XRD). Two groups of eleven coatings have been exposed at 550 degrees C for up to 150 h in air and air-315 vppm HCl. Weight change data was gathered from these exposures after 50 and 150 h. After each exposure period, the surfaces of the oxidation/corrosion products were characterised using SEM/EDX and XRD. This analytical data has been used to identify the phases formed and the morphology of the scales generated. The best performing coatings from the mass change data were cross-sectioned to characterise the damage.
机译：在生物质燃料发电厂中，已知过热器和再热器特别容易受到氯化物诱导的炉边腐蚀。一种延长使用寿命的方法是开发新的涂层，以抵抗此类炉边腐蚀损坏。本文报告了使用组合模型合金开发方法的这种方法的初始阶段。使用两靶磁控溅射系统（99.95 wt％Cr和Fe-30 wt％Al）的物理气相沉积（PVD）已用于获得一系列涂料组合物。将涂层沉积到放置在靶材前面的一系列蓝宝石圆盘（直径10毫米; 3毫米厚）上。这导致了一组样品的镀层具有不同的Cr / Fe / Al比范围，这些样品已使用扫描电子显微镜/能量色散X射线分析（SEM / EDX）和X射线衍射（XRD）进行了表征。两组11层涂料已在550摄氏度的空气和315 vppm的HCl空气中暴露了长达150小时。在50和150小时后，从这些暴露中收集体重变化数据。在每个暴露时间之后，使用SEM / EDX和XRD表征氧化/腐蚀产物的表面。该分析数据已用于识别形成的相和所生成鳞片的形态。根据质量变化数据对性能最好的涂层进行了横切以表征损伤。

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