Effects of alloying elements on the electrochemical characteristics of iron aluminides |
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| Authors: | H C CHOE H S KIM D C CHOI K H KIM |
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| Affiliation: | (1) Department of Iron Manufacture and Metallurgical Engineering, Kwang Yang College, Kwang Yang, 545-800, Korea;(2) Department of Materials Science and Metallurgical Engineering, Sunchoen National University, Sunchoen, 540-742, Korea;(3) Department of Metallurgical Engineering, Chonnam National University, Kwangju, 500-757, Korea |
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| Abstract: | Effects of alloying elements on the electrochemical characteristics of iron aluminides in the H2SO4, H2SO4+KSCN and HCl solutions
were investigated using electrochemical tests. The corrosion morphologies in iron aluminides were analysed by utilising optical
microscopy. It was found that the addition of Cr and Mo to iron aluminides increased the corrosion potential, pitting potential
and repassivation potential. The active current density, passive current density and reactivation current density decreased
as Cr and Mo were added. In the case of Mo addition, the passive current density was slightly higher in the H2SO4 solution
than in solutions containing SCN- and Cl-. When B was added to samples, the corrosion potential and repassivation potential
decreased, whereas the active current density, passive current density, reactivation current density and pitting potential
increased. Iron aluminides containing Mo and Cr showed remarkably improved intergranular and pitting corrosion resistance
to SCN- and Cl- solution. On the other hand, B addition accelerated granular and intergranular corrosion by precipitation
of borides.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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