几种铁基和镍基合金在25Na_2SO_4-75K_2SO_4(wt%)混合盐作用下的腐蚀行为

中国腐蚀与防护学报

1991, Vol. 11

Issue (2): 188-192

研究报告

本期目录 | 过刊浏览

几种铁基和镍基合金在25Na_2SO_4-75K_2SO_4(wt%)混合盐作用下的腐蚀行为

郭曼玖;卢亚轩;朱日彰;郑晓光

北京钢铁研究总院;北京钢铁研究总院;北京科技大学;北京科技大学

CORROSION BEHAVIOUR OF SOME IRON, AND NICKEL-BASED ALLOYS IN MIXED SALTS OF 25Na_2SO_4-75K_2SO_4(wt%) AT 900℃

Guo Manjiu Lu Yaxuan (Beijing Central Research Institute of Iron and Steel) Zhu Rizhang Zheng Xiaoguang (The University of Science and Technology; Beijing)

全文: PDF(1668 KB)

摘要: <正> 一、引言高温合金在一定的工作环境下,会因含有一定量碱金属硫酸盐(Na_2SO_4,K_2SO_4)的燃煤灰粉沉积于合金表面而发生热腐蚀。为模拟上述条件,本工作在Na_2SO_4-K_2SO_4混合盐中测定了五种合金(铁基及镍基)的热腐蚀行为。本文报导实验结果。

Abstract：Specimens of three chromia-forming alloys,Fe-25Cr-2Mo,Fe-25Cr-20Ni,Ni-28Cr-2Cu-RE,and of two alumina-forming alloys, Fe-25Cr-6Al-0. 4Y, Fe-40Ni-21Cr-6Al-0. 1 Y,were exposed to the ambient atmosphere at 900℃ in the mixed salts of 25Na_2 SO_4-75K_2SO_4 (wt. %). Corrosion products were analysed by X-ray diffraction and electron microscopy. Sulfate salts tagged with. ~(35)S were used; sulfur penetration profiles were then determined,and the lateral distribution of sulfur within the alloy matrix was observed by autoradiography. Internal sulfidation/internal oxidation was found to be the major mode of attack, preferably along grain boundaries. The chromia scale was rather thick, permitted rapid inward penetration of sulfur to form chromium sulfide along the grain boundaries. Alumina scale offered better protection than did chromia scale. By comparison, the two alumina-forming alloys were found to be more resistant than the other three chromiaforming alloys under the experimental conditions.

收稿日期: 1991-04-25

	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
	郭曼玖
	卢亚轩
	朱日彰
	郑晓光
44.8K

引用本文:

郭曼玖;卢亚轩;朱日彰;郑晓光. 几种铁基和镍基合金在25Na_2SO_4-75K_2SO_4(wt%)混合盐作用下的腐蚀行为[J]. 中国腐蚀与防护学报, 1991, 11(2): 188-192.
. CORROSION BEHAVIOUR OF SOME IRON, AND NICKEL-BASED ALLOYS IN MIXED SALTS OF 25Na_2SO_4-75K_2SO_4(wt%) AT 900℃. J Chin Soc Corr Pro, 1991, 11(2): 188-192.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1991/V11/I2/188

[1] Zhu R., Guo M.,and Zuo Y., Oxid. Met.,27 (5/6) ,253(1987)
[2] Zuo Y.,Zhu R., and GuoM.,Corr.,43 (1) ,51(1987)
[3] Phase Diagrams for Ceramists, ed. by Ernest M. Levin et al, 1969 Supplement, P. 252
[4] Seybolt A. U., Trans. Met. Soc.AlME,242,1955(1968)
[5] Pettit F. S., Hot Corrosion Degradaton of Metals and Alloys-A United Theory, AD-A 072645, June, 1979

No related articles found!

Viewed

Full text

Abstract

Cited

Shared

Discussed