Development of advanced Al coating processes for future application as anti-corrosion and T-permeation barriers
Development of advanced Al coating processes for future application as anti-corrosion and T-permeation barriers
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DOI：
10.1016/j.fusengdes.2010.08.018
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发表时间：
2010-12
影响因子：
1.7
通讯作者：
J. Konys;W. Krauss;N. Holstein
中科院分区：
文献类型：
--
作者：
J. Konys;W. Krauss;N. Holstein
在HCLL概念中，还原铁素体-马氏体钢（如Eurofer 97）被预见在未来的熔合技术中作为结构材料，然而，它们在Pb-15.7Li中表现出强烈的溶解攻击。在550℃下，当流速为0.22m/s时，Picolo环的腐蚀值高达400μm/年。在Picolo测试中发现，大量的腐蚀产物被运输并以沉淀的形式沉积在较冷的位置，存在管道堵塞的风险。因此，可靠的TBM功能要求防腐蚀屏障。以往的研究（如热浸镀铝）表明，铝基涂层具有这样的抗腐蚀和减少t渗透的行为。然而，工业上相关的涂层技术缺乏，热浸不能满足低活化标准。电化学沉积保证了这些特性，但是水基系统是不合格的。通过对非水体系铝涂层方法的研究，成功地在两种不同类型的电解质中沉积了高度可重复性和可控制厚度的铝鳞片。第一种是基于有机芳香化物作为电解质，第二种变体使用有机盐熔体（离子液体）。讨论了其具体的特点和优势，以及在Pb-15.7Li中热处理后保护鳞的形成及其行为。
Reduced ferritic-martensitic steels (e.g. Eurofer 97) are foreseen in future fusion technology as structural material in the HCLL concept, however, they show strong dissolution attack in Pb–15.7Li. Corrosion testing in Picolo loop revealed dramatically values of about 400μm/year at flow rates of 0.22m/s at 550°C. This large amount of corrosion products is transported and will be deposited as precipitates at cooler positions with the risk of line blockages as found in Picolo testing. Thus, reliable TBM function claims anti-corrosion barriers. Previous studies (e.g. Hot-Dip Aluminization) showed that Al-based coatings have such anti-corrosion and also T-permeation reduction behavior. However, industrially relevant coating technologies are missing and Hot-Dip cannot fulfill low activation criteria. Electro-chemical deposition promises such features, however water-based systems are unqualified. The investigation of Al coating methods from non-aqueous systems succeeded in deposition of Al-scales in high reproducible and controllable thickness from two different types of electrolytes. The first one is based on organic aromates as electrolyte and the second variant uses organic salt melts (ionic liquids). The specific characteristics and advantages will be discussed as well as the formation of the protective scales after heat treatment and their behavior in Pb–15.7Li.