HOT DIPPING ALUMINIZED COATING AS HYDROGEN PERMEATION BARRIER
来源期刊：Acta Metallurgica Sinica2001年第6期
论文作者：M.Chini Z.Y.Yao Benamati A.Aiello
Key words：hot dipping aluminized coating; hydrogen permeation flux.martensitic steel; liquid Pb-17Li alloy; tritium permeation bar rier;
Abstract: The hydrogen permeation experiment of MANET II with hot dipping aluminized 1oat-ing was performed in temperature range of 573 to 623K, in gas phase and in liquiaPb-17Li phase. The hydrogen permeation reduction factor (PRF) evaluated in gasphase is 620 at 573K and 260 at 623K, and in liquid Pb-17Li phase is 24 45 at 573Kand 12-30 at 623K. The self-healing of coating is obvious and effective above 673K.The pressure dependence of permeation flux indicates strong surface contribution. Theway 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 outsidelayer not penetrate aluminized layer. The surface elemental analysis shows that Al/Oatomic ratio changes from 2/3 of not wetted part to about 1 of wetted part. Thedamage of coating surface seems to be related to the interaction of outside layer withliquid Pb-17Li and thermal stress during heating sample.
M.Chini1，Z.Y.Yao2，Benamati3，A.Aiello3
(1.Department of Physics, University of Trento, 38100 Trento, Italy;
2.China Institute of Atomic Energy, P.O.Box 275-51, Beijing 102413, China;
3.ENEA CR Brasimone, 40032 Camugnano, Bologna, Italy)
Abstract:The hydrogen permeation experiment of MANET II with hot dipping aluminized 1oat-ing was performed in temperature range of 573 to 623K, in gas phase and in liquiaPb-17Li phase. The hydrogen permeation reduction factor (PRF) evaluated in gasphase is 620 at 573K and 260 at 623K, and in liquid Pb-17Li phase is 24 45 at 573Kand 12-30 at 623K. The self-healing of coating is obvious and effective above 673K.The pressure dependence of permeation flux indicates strong surface contribution. Theway 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 outsidelayer not penetrate aluminized layer. The surface elemental analysis shows that Al/Oatomic ratio changes from 2/3 of not wetted part to about 1 of wetted part. Thedamage of coating surface seems to be related to the interaction of outside layer withliquid Pb-17Li and thermal stress during heating sample.
Key words:hot dipping aluminized coating; hydrogen permeation flux.martensitic steel; liquid Pb-17Li alloy; tritium permeation bar rier;
【全文内容正在添加中】
