Development of Al-Alloy Coating for Advanced Nuclear Systems Using Lead Alloys
Development of Al-Alloy Coating for Advanced Nuclear Systems Using Lead Alloys
复制标题
先进核系统用铅合金铝合金涂层的开发
DOI：
10.1115/1.4005989
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Suzuki Tetsuya
中科院分区：
文献类型：
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作者：
Kurata Yuji;Yokota Hitoshi;Suzuki Tetsuya
采用铅合金作为冷却剂的中小型反应堆因其热物性和化学性质而成为具有更高安全性的最有前途的反应堆概念之一。本文研究了液态铅铋共晶(LBE)核电系统铝合金涂层的研制。由于结构钢在高温液态LBE中腐蚀严重，因此有必要提高钢的耐腐蚀性。提出了一种利用Al、Ti、Fe粉末和激光加热进行铝合金涂层的方法。铝合金粉末熔覆过程中产生的主要缺陷是表面缺陷和裂纹。避免这些缺陷所需的条件是采用20 mm/min的激光扫描速度和调整涂层中的Al浓度。在550℃液态LBE中的腐蚀试验结果表明，316SS铝合金涂层可防止未涂层的316SS中观察到的晶界腐蚀和LBE渗透等严重腐蚀。铝合金涂层良好的耐腐蚀性是基于薄层的氧化铝薄膜，该薄膜可以在液态LBE中再生。从所制备的铝合金粉末涂层的安全性和耐腐蚀性的角度出发，估算出涂层中适宜的铝含量范围为4~12wt.%。
Small and medium reactors using lead alloys as coolants are one of the promising reactor concepts with improved safety because of their thermal-physical and chemical properties. This paper focuses on the development of Al-alloy coating for nuclear systems using liquid lead-bismuth eutectic (LBE). Since corrosion attack becomes severe against structural steels at high temperatures in liquid LBE, it is necessary to improve the corrosion resistance of steels. An Al-alloy coating method using Al, Ti, and Fe powders, and laser beam heating has been developed. The main defects formed in the Al-powder-alloy coating process are surface defects and cracks. The conditions required to avoid these defects are the employment of the laser beam scanning rate of 20 mm/min and the adjustment of the Al concentration in the coating layer. According to the results of the corrosion tests at 550Ã Â °C in liquid LBE, the Al-alloy coating layers on 316SS prevent severe corrosion attack such as grain boundary corrosion and LBE penetration observed in the 316SS without coating. The good corrosion resistance of the Al-alloy coating is based on the thin Al-oxide film, which can be regenerated in liquid LBE. From the viewpoint of the soundness of the produced Al-powder-alloy coating layers and the preservation of their corrosion resistance, it is estimated that the range of adequate Al concentration in the coating layer is from 4 to 12 wt. %.