高钼镍基合金在熔盐中脱溶腐蚀的研究

中国腐蚀与防护学报

1981, Vol. 1

Issue (3): 64-71

研究报告

本期目录 | 过刊浏览

高钼镍基合金在熔盐中脱溶腐蚀的研究

罔毅民

冶金部北京钢铁研究院

A Study of De-alloying Corrosion of High-Molybdenum Nickel-base Alloys in Fused Salts

Gang Yiming(Beijing Iustitute of Iron and Steel; The Ministry of Metallurgy)

全文: PDF(3368 KB)

摘要: 镍基合金、特别是Hastelloy N(16Mo—7Cr—5Fe—Ni)为美国发展熔盐反应堆研制的一种耐蚀材料。大量文献是针对在高纯熔融氟化物燃料盐系中的试验结果,并证实一般主要发生的是选择性脱铬反应。本试验(静态)是在普通(未经特殊净化处理)熔融氟化物盐或硝酸盐中进行。通过金属物理等手段,详细研究了表面腐蚀层的结构、钼对晶界脱溶腐蚀的影响及应力腐蚀破裂的过程。表明除铬元素外,也存在钼元素的选择性脱溶腐蚀,并构成上述腐蚀现象的主要原因。本文着重说明了钼的双重作用:一方面随着合金中钼含量的提高,明显改变了钼、铬元素沿晶粒边界和通过晶粒内部脱溶腐蚀的相对速度,从而抑制了在高温氟盐中出现晶间腐蚀;另一方面钼、铬元素的脱溶反应造成表面腐蚀层基本上是一种疏松多孔的纯镍层。在熔融硝酸盐中,尽管Hastelloy N合金的一般腐蚀速度极低,但发现在张应力的作用下加速了局部晶界的脱溶腐蚀;而钼、铬元素沿晶界的选择性脱溶反过来又促进了裂纹的形成和扩展,引起晶间应力腐蚀破裂。

Abstract：Nickel-base alloy, especially Hastelloy N, is a highly corrosion-resistant material developed for fused salt reactor . The experimental results as. reiorted in last literature were obtained in highly pure fused fluoride fuels with dechromisation as the main reaction. The present work is conducted in ordinary fused fluorides or nitrates in static state. The structure of surface. corrosion layer, the influence of Mo on dealloying corrosion at crystal boundaries and the process of stress corrosion cracking have been studied. It is shown that there is selective precipitation of Mo in addition to Cr. The effect of Mo is twofold. On the one hand, as the Mo content in the alloy is increased, the relative speeds of dealloying of Mo and Cr along crystal boundaries and within the crystals are changed accordingly, thus intercrystalline corrosion is restrained. On the other hand,the surface layer is essentially a loose, porous layer of pure Ni owing to dealloying of Mo and Cr, and, despite of rather low speed of general corrosion of Hastelloy, the. dealloying corrosion at crystal boundaries will be accelerated under tensile stress, thus the selective dealloying of Mo and Cr along crystal boundaries will in turn promote the initiation and growth of crack and will lead to. intercrystalline stress corrosion cracking.

收稿日期: 1981-06-25

	服务

	把本文推荐给朋友
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	罔毅民
44.8K

引用本文:

罔毅民. 高钼镍基合金在熔盐中脱溶腐蚀的研究[J]. 中国腐蚀与防护学报, 1981, 1(3): 64-71.
. A Study of De-alloying Corrosion of High-Molybdenum Nickel-base Alloys in Fused Salts. J Chin Soc Corr Pro, 1981, 1(3): 64-71.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1981/V1/I3/64

[1] W. E. Berry, Corrosion in Nuclear Applications, 460-478 (1971)
[2] W. R. Grimes, Nuclear Applications and Technology, Vol. 8, No. 9． , 137-155 (1970)
[3] J. W. Koger, ORNL-4548, Feb., 240-247 (1970)
[4] J. W. Koger, Trans. Amer. Nucl. Soc., Vol. 5, No. 1, 227 (1972)
[5] J. W. Koger, ORNL-4622, January, 165-191 (1971)
[6] 冶金部钢铁研究院,Cr-Mo-Ni基合金在高温氟盐中的腐蚀,(1971)
[7] 冶金部钢铁研究院熔盐腐蚀组.各种钢在熔融硝盐中腐蚀性能的研究,新金属材料,No.3,22～35(1976)
[8] W. E. Kirst, et al., Tran. of American institute of Chem. Eng., Vol. 36, 372 (1940)
[9] J. W. Koger, ORNL-4770, edited by Sigfred Peterson, 160 (1971)
[10] #12
[11] #12
[12] #12
[13] 上海冶金研究所,硝盐腐蚀试验报告,(1972)
[14]#12

No related articles found!

Viewed

Full text

Abstract

Cited

Shared

Discussed