Corrosion behavior of boro-tempered ductile iron |
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Authors: | Y Kayali A Büyüksa?i? Y Yalçin |
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Affiliation: | (1) Department of Metallurgical and Materials Engineering Department, National Institute of Technology Karnataka, Surathkal, Srinivasnagar, Mangalore, 575 025, India |
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Abstract: | In this study, the effect of boro-tempering heat treatment on the microstructure and corrosion behavior of unalloyed ductile
iron was investigated. The corrosion characteristics of ductile iron have been determined by current-potential curves. To
determine the corrosion rates, the anodic and cathodic Tafel regions extrapolating to corrosion potentials were used. The
inhibitor efficiency was calculated from i
corr values. Optical microscope and X-ray diffraction (XRD) were used to examine the microstructure of polished and etched specimens.
Thicknesses of the boride layers formed on samples were measured by an optical micrometer attached to the optical microscope.
Results show that boro-tempering heat treatment can be successfully applied to ductile iron. The corrosion potential has shifted
to more positive values in the boronized samples. The boride layer has behaved like an anodic inhibitor. The boronizing time
has affected the corrosion rate. The increase in boronizing time has made the coating thicker, which has increased the corrosion
resistance of the material. The best inhibition and the lowest corrosion rate have been performed on the sample which was
boronized for 5 hours after cooling in furnace. The tempering at higher temperatures leads to an increase in the corrosion
resistance of the materials tested here. |
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