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首页> 外文会议>European Corrosion Congress >The effect of KCl on Fe-Cr-Al Sputter Coatings in the High Temperature Chloride Environment at 550°C
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The effect of KCl on Fe-Cr-Al Sputter Coatings in the High Temperature Chloride Environment at 550°C

机译：KCl对550℃的高温氯化物环境中Fe-Cr-Al溅射涂层的影响

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In biomass-fired power plants the most vulnerable components to chloride induced fireside corrosion damage are heat exchangers, such as superheaters and reheaters. Developing a new coating composition that is resistant to this type of corrosion is one of the potential solutions to increasing their operational life-time. This paper reports the initial stages of coating development using a combinatorial model alloy development method. Physical Vapour Deposition (PVD) with a two-target magnetron sputtering system (99.95 wt.% Cr and 70 wt.% Fe - 30 wt.% Al) has been used to obtain a range of coating compositions. These coatings were deposited onto an array of sapphire discs (10 mm diameter, 3 mm thick) placed under the sputtering targets. This resulted in a group of coatings with a range of different Cr to Fe/Al ratios. Two groups of eleven coatings (which represent the range of compositions generated) have been exposed for screening tests at 550°C for up to 150 hours in an air-315 vppm HCl environment with and without a KCl deposit. Weight change data has been gathered from these exposures after 50 and 150 hours. After each exposure period, the surfaces of the samples (including deposit/corrosion products) were characterised using SEM/EDX and XRD. Samples were cross-sectioned and analysed using FEG-SEM/EDX. These analytical techniques have been used to identify the phases formed and the morphology of the scales generated to identify the coating compositions with the most resistance to these environments. On-going activities are investigating the performance of an increasingly narrow range of coating compositions (generated by the use of a different pairs of targets in the magnetron sputterer) to find those that minimise the damage caused by the KCl rich deposits at 550°C.
机译：在生物测定的发电厂中，氯化物诱导的燃烧腐蚀损坏的最脆弱的成分是热交换器，如过热剂和再欣赏者。开发一种耐用这种类型腐蚀的新涂料组合物是增加其运行寿命的潜在解决方案之一。本文用组合模型合金开发方法报道了涂层开发的初始阶段。用双靶磁控溅射系统（99.95重量％Cr和70重量％Cr。％Fe - 30重量％Al）的物理气相沉积（PVD）已被用于获得一系列涂料组合物。将这些涂层沉积在溅射靶制下的蓝宝石盘（直径为3mm厚）上。这导致一组具有一系列不同Cr至Fe / Al比的涂层。两组一组十一涂层（代表产生的组合物的范围）已经暴露在空气-315 VPPM HCl环境下在550℃下筛选50小时，并且没有KCl沉积物。在50和150小时后，从这些曝光中收集了重量变化数据。在每次暴露后，使用SEM / EDX和XRD表征样品的表面（包括沉积物/腐蚀产物）。使用Feg-SEM / EDX横截面并分析样品。这些分析技术已被用于鉴定形成的相位和产生的鳞片的形态，以鉴定具有对这些环境的最抗性的涂料组合物。正在进行的活动正在研究越来越窄的涂料组合物的性能（通过在磁控溅射器中使用不同的靶对产生），以找到最小化由550℃的KCl富含沉积物引起的损伤的那些。

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