HOT DIPPING ALUMINIZED COATING AS HYDROGEN PERMEATION BARRIER

作     者：Z. Y Yao, M. Chini, A. Aiello and G. Benamati (China Institute of Atomic Energy, P.O.Box 275-51, Beijing 1024l3, China) ( Department of Physics, University of Trento, 38100 Trento, Italy) ( ENEA CR Brasimone, 40032 Camugnano, Bologna, Italy) 

作者机构：China Institute of Atomic Energy Department of Physics University of Trento ENEA CR Brasimone 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2001年第14卷第6期

页      面：435-440页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：Electroless plating Hydrogen Maraging steel Mechanical permeability 

摘      要：The hydrogen permeation experiment of MANET II with hot dipping aluminized coating was performed in temperature range of 573 to 623 K, in gas phase and in liquid Pb-17Li phase. The hydrogen permeation reduction factor (PRF) evaluated in gas phase is 620 at 573 K and 260 at 623 K, and in liquid Pb-17Li phase is 24-45 at 573 K and 12-30 at 623 K. The self-healing of coating is obvious and effective above 673 K. The pressure dependence of permeation flux indicates strong surface contribution. The way of filling hydrogen by continuous flow and/or bubble can increase permeation flux. The result of SEM-EDS shows that the microcrack is on the surface of the wetted part, but not on the not wetted part. The crack is superficial and affects only thin outside layer not penetrate aluminized layer. The surface elemental analysis shows that Al/O atomic ratio changes from 2/3 of not wetted part to about 1 of wetted part. The damage of coating surface seems to be related to the interaction of outside layer with liquid Pb-17Li and thermal stress during heating sample.