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| 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) |
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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.
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Received: 25 April 1991
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Cite this article:
Guo Manjiu Lu Yaxuan (Beijing Central Research Institute of Iron and Steel) Zhu Rizhang Zheng Xiaoguang (The University of Science and Technology; Beijing). 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.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1991/V11/I2/188
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[5] Pettit F. S., Hot Corrosion Degradaton of Metals and Alloys-A United Theory, AD-A 072645, June, 1979 |
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