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Ni-Ti合金在熔融(Li,K)2CO3中的腐蚀行为研究

A STUDY ON THE CORROSION OF Ni-Ti ALLOYS IN MOLTEN (Li,K)2CO3

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【作者】 曾潮流吴维

【Author】 ZENG Chaoliu, WU Weitao (State Key Laboratory for Corrosion and Protection, Institute of Corrosion and Protection of Metals, The Chinese Academy of Sciences, Shenyang 110015)

【机构】 中国科学院金属腐蚀与防护研究所金属腐蚀与防护国家重点实验室!沈阳110015

【摘要】 研究了Ni,Ni-5Ti, Ni-10Ti及 Ni-15Ti(质量分数,%,下同)合金在 650℃熔融(62Li-38K)2CO3(摩尔分数,%)中,空气气氛下的腐蚀行为.Ni-5Ti合金的腐蚀速度小于纯镍,表面形成Ni和Ti的混合氧化膜,Ni-10Ti和Ni-15Ti合金的腐蚀速度却明显高于纯镍,表面也形成了 Ni和 Ti的混合氧化膜,但沿原始合金中的TiNi3相发生了严重的Ti的内氧化.和纯镍相比, Ni-Ti合金表面氧化膜的生长速度明显减慢,讨论了合金腐蚀机制。

【Abstract】 The corrosion behaviors of Ni, Ni-5Ti, Ni-10Ti and Ni-15Ti (mass fraction, %) in molten (Li62-K38)2CO3 at 650℃ under air have been studied. The corrosion of Ni-5Ti is slighter than that of pure Ni, yielding a mixed scale of Ni and Ti oxides. The corrosion rates of Ni-10Ti and Ni-15Ti are significantly higher than that of pure Ni, with the formation of an external scale containing Ni and Ti oxides, and a wide internal oxidation zone of Ti along the intermetallic compound phase TiNi3 in the original alloys. Compared with pure Ni, the growth of the external scale developed on Ni-Ti alloys is obviously reduced. The corrosion mechanism of the alloys was also discussed.

【关键词】 NiNi-Ti合金熔融(Li,K)2CO3腐蚀
【Key words】 nickelNi-Ti alloysmolten (LiK)2CO3corrosion
【基金】 国家自然科学基金!59971053
  • 【文献出处】 金属学报 ,ACTA METALLRUGICA SINICA , 编辑部邮箱 ,2000年05期
  • 【分类号】TG17
  • 【被引频次】3
  • 【下载频次】78
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