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| ELECTROCHEMICAL CORROSION BEHAVIOR OF Ni_3Al(B)-BASED INTERMTALLIC COMPOUNDS IN LiCl-KCl MOLTEN SALT |
| Chen Junming; Xu Songbo (Shanghai institute of Metallurgy;Chinese Academy of Sciences) |
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Abstract The anodic polarization curves of three intermetallic compounds,i.e.N i3 Al(B)t Ni3 Al(B)- Cr-Zr andNib Al (B)-Cr-Mg-As t in 58L iCI-42KCl (mol%)molten salt with or without"impurity" at 4 50℃ were studied.The results indicated that no Flade potential was observed and that electrochemical passivation didnot occur in the pure molten salt.However,these intermetallic compounds showed passivation behaviorand their anodic current densities were lowered in the molten salt with Li2CO3 as impurity.ObviouslyLi2CO3 was an effeCtive inhibitor in these cases. On the contrary,the anodic current densities were higherin the molten salt with metallic chides, such as MgO,ZnO or MnO2.Because of the difference in solubilityproduct of the metallic chides,in some cases the anodic polarization curves showed diffusion control or passiVation. The possible action of CO,O2 and O2-during electrochemical corrosion in LiCl-KCl moltensalt was discussed. The observed variation of the shape of polarization curves might be attributed to threepaths of Oxide formation.
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Received: 25 June 1995
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| 1BattleJE．Inter．Mater．Rev．,1989,34(1):1-182LiuCT．J．Metals,1986,38(5):19-213徐颂波,陈俊明．金属学报,1994,30(11):A5214徐颂波,陈俊明．中国腐蚀与防护学报,1995,15(3):1615FengXF,MelendresCA．J．Electrochem．Soc,1982,129:12456LittlewoodR,ArgentEJ．Electrochim．Acta,1961,4:1147NishikataA,NumataH,TsuruT．Mater．Sci&Eng．,1991,A146:15-318HortonJA,CathcartJV,LiuCT．Oxid．Met．,1988,29:3479西方笃,谷康彦,春山志郎.日本金属会志,1984,48(7):705 |
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