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| PREPARATION OF ALUMINIDE COATINGS ON HR-2 STAINLESS STEEL |
| ZHANG Guikai1; LI Ju1; CHEN Chang'an1; DOU Sanping1; LING Gouping2 |
1. National Key Laboratory of Surface Physics; Mianyang 621907
2. Zhejiang University; Hangzhou 310027 |
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Cite this article:
ZHANG Guikai LI Ju CHEN Chang'an DOU Sanping LING Gouping. PREPARATION OF ALUMINIDE COATINGS ON HR-2 STAINLESS STEEL. Acta Metall Sin, 2009, 45(8): 983-987.
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Abstract The aluminized coating has been widely applied on structural materials in fusion reactors as a tritium permeation barrier (TPB). In present study, we proposed a new two-step method for preparing an aluminized coating on HR-2 stainless steel: room temperature molten salt electroplating followed by heat treating at 500 and 700 ℃ in air. In the electroplating process, aluminum deposition from AlCl3/EMIC to the surface of HR-2 stainless steel was performed with a deposition rate of\linebreak 15 μm/h at 25 ℃ under the protection of argon gas. This method permits coating of large complex shapes that have few blind areas. The coating microstructure has been characterized by optical microscope (OM), scanning electronic microscope (SEM), energy dispersive spectroscope (EDS) and X-ray diffraction (XRD). These results show that after heat treated at 500 ℃ for 10 h, the coating thickness is about 10-15 μm consisting of two distinct layers with a clear interface between the coating and substrate. however, after heat treated at 700 ℃ for 2 h, the coating thickness is changed to about 10-13 μm and it consists of an external (Fe, Cr, Mn and Ni)2Al5 layer, inner (Fe, Cr, Mn and Ni)Al layer and transitional (Fe, Cr, Mn and Ni)3Al layer. No clear interface between the coating and substrate and defects and cracks in the coating were observed.
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Received: 01 December 2008
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