CORROSION BEHAVIOR OF Zr-0.4Fe-1.0Cr-x Mo ALLOYS IN 500℃ and 10.3 MPa STEAM

WEI Tianguo; LONG Chongsheng; MIAO Zhi; LIU Yunming; LUAN Baifeng

doi:10.3724/SP.J.1037.2012.00679

Acta Metall Sin >

2013 , Vol. 49 >Issue 6: 717 - 724

DOI: https://doi.org/10.3724/SP.J.1037.2012.00679

CORROSION BEHAVIOR OF Zr-0.4Fe-1.0Cr-x Mo ALLOYS IN 500℃ and 10.3 MPa STEAM

WEI Tianguo ,
LONG Chongsheng ,
MIAO Zhi ,
LIU Yunming ,
LUAN Baifeng

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1)Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610041
2)Institute of Material Science and Technology, Chongqing University, Chongqing 400044

Received date: 2012-11-12

Revised date: 2013-02-25

Online published: 2013-06-11

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Abstract

The possibility of using Mo as an alloying element in zirconium alloys was considered in terms of its strengthening effect and microstructure refinement effect. However, the impact of Mo addition on the corrosion resistance was not fully understood. In this work, Zr-0.4Fe-1.0Cr-x Mo (x=0, 0.2, 0.4, 0.6, mass fraction,%) alloys with addition of different Mo contents were prepared by vacuum arc melting method and their corrosion resistance in 500℃, 10.3 MPa steam was investigated. Compared with Zr-4, N18 and M5 alloys, the corrosion rate of Zr-0.4Fe-1.0Cr-x Mo alloys was much lower, which was attributed to the large numbers of fine second phase particles in the matrix. Addition of Mo improved the evolution of the oxide film during growth and resulted in the degradation of corrosion resistance. The growth of the oxides remained cubic kinetics in the whole corrosion period (2000 h) for the Mo free alloy, whereas changed from cubic to linear kinetics after a corrosion time of 500--1000 h for the Mo containing alloys.

Key words： zirconium alloy; Mo; corrosion resistance, second phase particle; oxide film

Cite this article

WEI Tianguo , LONG Chongsheng , MIAO Zhi , LIU Yunming , LUAN Baifeng . CORROSION BEHAVIOR OF Zr-0.4Fe-1.0Cr-x Mo ALLOYS IN 500℃ and 10.3 MPa STEAM[J]. Acta Metall Sin, 2013 , 49(6) : 717 -724 . DOI: 10.3724/SP.J.1037.2012.00679

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