Abstract

Roland Tolulope Loto

DOI : http://dx.doi.org/10.13005/ojc/340527

Potentiodynamic polarization data for nickel alloys N07718 and N07208 in 2M H₂SO₄ solution at 0% - 5% NaCl concentrations are presented in tabular form showing the qualitative relationship between the corrosion resistance, passivation behavior and interfacial redox reactions of the alloys with the increase in chloride ion concentration. Tafel plots from the polarization test are presented to show the anodic-cathodic transition curves with respect to variable applied potential and scan rate. Data on open circuit potential measurement for the 1200s showed the active-passive behavior of both alloys and their thermodynamic stability in the acid solution. Optical micro-analytical images of the alloys before corrosion and at 0%, 0.5% and 5% NaCl after corrosion are presented for morphological and comparative analysis.

Corrosion; Passivation; Pitting; Steel

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