An advance process of aluminum rich coating as tritium permeation barrier on 321 steel workpiece
An advance process of aluminum rich coating as tritium permeation barrier on 321 steel workpiece
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DOI：
10.1016/j.fusengdes.2012.03.015
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发表时间：
2012-08
影响因子：
1.7
通讯作者：
Guikai Zhang;C. A. Chen;D. Luo;Xiaolin Wang
中科院分区：
文献类型：
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作者：
Guikai Zhang;C. A. Chen;D. Luo;Xiaolin Wang
提出了一种先进的三步法工艺，即在离子液体中电镀铝，然后热处理和选择性氧化，制备富铝涂层作为氚渗透阻挡层（TPB）。在本工作中，先进工艺应用于321钢工件。在铝电镀中，通过在氯化铝（AlCl 3）-1-乙基-3-甲基咪唑氯化物（EMIC）离子液体中以20 mA/cm 2的恒电流电沉积来涂覆工件。这些工件上的铝涂层都显示出诱人的亮度，并与工件表面粘附良好。在渗铝时间为1 ~ 30 h的范围内，对321钢在700°C下渗20μm铝层进行了一系列试验。经8h热处理后，工件表面获得了30μm厚的渗铝层，渗层均匀、无孔隙，主要成分为（Fe，Cr，Ni）Al 2。最终制备的富铝涂层为双层结构，由0.2μm厚的γ-Al 2 O3外层和50μm厚的（Fe，Cr，Ni）Al/（Fe，Cr，Ni）3Al内层组成。在600-727 ℃温度范围内，涂有该涂层的试样（Φ 80×2，L150 mm）的氘渗透降低因子（PRF）提高了2个数量级。并对该工艺的重现性进行了研究。
We have proposed an advance three-step process, Al-electroplating in ionic liquid followed by heat treating and selectively oxidation, preparing aluminum rich coating as tritium permeation barrier (TPB). In present work, the advance process was applied to 321 steel workpieces. In the Al-electroplating, pieces were coated by galvanostatic electrodeposition at 20mA/cm2in aluminum chloride (AlCl3)–1-ethyl-3-methylimidazolium chloride (EMIC) ionic liquid. The Al coating on those pieces all displayed attractive brightness and well adhered to surface of pieces. Within the aluminizing time from 1 to 30h, a series of experiments were carried out to aluminize 321 steel pieces with Al 20μm coating at 700°C. After heat treated for 8h, a 30μm thick aluminized coating on piece appeared homogeneous, free of porosity, and mainly consisted of (Fe, Cr, Ni)Al2, and then was selectively oxidized in argon gas at 700°C for 50h to form Al2O3scale. The finally fabricated aluminum rich coating, without any visible defects, had a double-layered structure consisting of an outer γ-Al2O3layer with thickness of 0.2μm and inner (Fe, Cr, Ni)Al/(Fe, Cr, Ni)3Al layer of 50μm thickness. The deuterium permeation reduction factor, PRF, of piece (Φ 80×2, L 150mm) with such coating increased by 2 orders of magnitude at 600–727°C. The reproducibility of the process was also showed.