Corrosion of carbon-alloyed iron aluminides

Bulletin of materials science

M Sen¹  A V Ramesh Kumar²  R Balasubramaniam¹ 

[1] Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur 208 016, India$$Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur 208 016, IndiaDepartment of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur 208 016, India$$;Defence Materials Stores and Research Development Establishment, Kanpur 208 013, India$$Defence Materials Stores and Research Development Establishment, Kanpur 208 013, IndiaDefence Materials Stores and Research Development Establishment, Kanpur 208 013, India$$

关键词: Corrosion;    iron aluminides;    Fe3Al;    potentiodynamic polarization.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The corrosion behaviour of two carbon-alloyed intermetallics of composition Fe�??28.1Al�??2.1C and Fe�??27.5Al�??3.7C has been studied and compared with that of binary intermetallics. Potentiodynamic polarization studies indicated that the intermetallics exhibited active�?�passive behaviour in an acidic solution of pH = 1, whereas they exhibited stable passivity in a buffer solution of pH 8.4. Corrosion rates were also obtained by immersion testing. The variation of corrosion rate as a function of time was similar for both the intermetallics. The variation in corrosion rate as a function of time has been explained based on the observed potentiodynamic polarization behaviour. Scanning electron microscopy of corroded surfaces indicated that the carbon-alloyed intermetallics were susceptible to galvanic corrosion, due to the presence of carbides.

【 授权许可】

Unknown