Year-end Sale % OFF 
Abstract
Abstract The breakdown of passive films potentiostatically formed on iron in borate and phosphate solutions of pH 8.42 and 11.50 is investigated in 0.5 kmol/m3 NaCl solution at a constant potential of −0.195 V(SHE) higher than a critical pitting potential of −0.295 V in the same solution. The investigation revealed that the logarithmic plots for pitting current (ip) or amount of electric charge (Qp) vs time curves were composed of two straight lines with different slopes after a short period in which ip scarcely flows. The time, τ, required for the transition from the first to the second line was found to be a linear function of passivation potential irrespective of anion species and solution pH in which a passive film was formed. However, the slope of their linear relation depended on anion species and solution pH. It is believed that the first straight line corresponds to pit nucleation and the second one to pit growth. The dependence of τ on log (Cl−) gives the critical chloride ion concentration of 0....
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
