Abstract
The investigation focused toward microstructure and electrochemical changes caused by proton on a passive film formed on the surface of stainless steel-304 in lower concentrated sulfuric acid solutions (exclusively 0.5, 1.0, 2.0, and 5.0 N concentrations). Dissociation rate of the proton in the acid was reduced due to increasing of acid concentration from 0.5 to 5.0 N, which causes anodic shift at open circuit potential region and cathodic shift in different passivation potential regions. Proton enhances different electrochemical behaviors such as activation, primary, secondary passive, and transpassive behaviors, which was concluded by increasing of current value in these regions. AC impedance parameters such as double layer capacitance ( C dl ), charge transfer resistance ( R ct ) are compared with selective polarization parameters. Microstructure and chemical entities present in the passive film were examined through scanning electron microscopy and X-ray photoelectron spectroscopic techniques. The role of H+ and SO42- ion on metal dissolution and passive film formation have been discussed.
Sign-in/Register to access full text options 
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.
