研究了Ｎｉ３Ａｌ（Ｂ）系金属间化合物在４５００Ｃ纯的和含有“杂质”的ＬｉＣｌ－ＫＣｌ熔盐中的阳极极化曲线。发现在纯盐中阳极不出现Ｆｌａｄｅ电位，不发生电化学钝化。在含有“杂质”的熔盐中，所研究的金属间化合物都出现电化学钝化，阳极电流密度降低。Ｌｉ２ＣＯ３是合金熔盐腐蚀有效的缓蚀剂。在分别含有“杂质”ＭｇＯ、ＺｎＯ、ＭｎＯ２金属氧化物的熔盐中，金属间化合物的阳极电流密度都增高，并依据金属氧化物的溶解度积，有时会使合金的阳极极化曲线出现扩散控制或电化学钝化过程。讨论了在ＬｉＣｌ－ＫＣｌ熔盐腐蚀电化学中的作用，指出三条途径形成的氧化物及其行为。
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.
参考文献
| [1] | BattleJE．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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