Abstract
This chapter presents a study on the effects of soluble aluminum in the corrosion behavior of iron in alkaline media. Solutions are prepared by dissolving Al foils in NaOH O.IM to reach the solubility limit, which was about 13.5 mg.L-1. The tested material was pure iron (99.9%) obtained from Goodfellow as rods. The exposed area was the cross section (0.2 cm2), freshly polished and rinsed surface, where the polishing was done using SiC paper down to 1200 grade. The electrochemical cell was a conventional three electrode arrangement, in which the tested sample functioned as working electrode, platinum gauze as counter electrode, and an Hg/HgO O.IM KOH as reference electrode. The electrochemical tests were performed immediately after surface preparation at room temperature and open to the laboratory atmosphere, using an AUTOLAB 30 Potentiostat. The results shows that the presence of Al3+ is able to inhibit pitting of iron in chlorinated alkaline media, due to the adsorption of aluminates blocking the interface.
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 callMore From: Passivation of Metals and Semiconductors, and Properties of Thin Oxide Layers
Disclaimer: 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.
