Al、(Al,Si)涂层的制备及其在550℃液态铅铋合金中的防腐蚀性能研究

Preparation of Aluminum and(Aluminum,Silicon) Coatings and Study of the Coatings Anti-corrosion Properties in 550 ℃ Liquid Lead-bismuth Eutectic

液态铅铋是加速器驱动次临界系统(ADS)的冷却剂兼散裂靶主选材料之一,作为加速器ADS系统中最合适的候选结构材料之一的奥氏体不锈钢316L,如果在高温液态铅铋合金(LBE)中遭受腐蚀会严重影响系统的安全性,因此必须要提高结构钢材的高温防腐蚀性能。本文利用热蒸发法在奥氏体不锈钢316L表面制备了Al及Si掺杂Al的Al-Si,Si-Al和Al(Si)四种涂层。利用X射线衍射,扫描电子显微镜和能谱仪表征和分析了涂层的相结构和显微结构。将四种涂层在550℃液态铅铋防腐1 000 h后,研究了它们的防腐蚀性能。结果表明,在目前的腐蚀条件下,四种涂层均具有良好的防LBE腐蚀性能,其中Al-Si涂层的防腐蚀性最好。

Liquid lead-bismuth eutectic（LBE） is one of candidates of spallation target and coolant materials for the Accelerator Driven Sub-critical System（ADS）,and the austenitic stainless steel 316 L is considered as a possible candidate structural material for ADS. However the corrosion of austenitic stainless steel 316 L in this liquid alloy will affect the security of the system. In order to solve the problems,the Al and（Al,Si） coatings were prepared on austenitic stainless steel 316 L by thermal evaporation deposition method. Three different process were used to prepare（Al,Si） coatings and they were Al-Si,Si-Al and Al（Si） coatings. The microstructure and phase of the samples was examined by SEM,EDS and XRD. The anti-corrosion properties of these samples were studied in liquid LBE at 550 ℃ for 1 000 h. The results showed that all the coatings have good resistance to LBE corrosion and the anti-corrosion performance of the Al–Si coating is the best.