Abstract
The potassium silicate coatings cured by calcium hydrogen phosphate (CHP) at 25, 120 and 200 °C were investigated using electrochemical impedance spectroscopy, scanning electron microscope, X-ray diffraction, Raman spectra and Silicon-29 nuclear magnetic resonance spectra. The potassium silicate coating cured by 10 wt% CHP at 120 °C exhibited ultrahigh low-frequency impedance, represented by Z0.01, ∼61 GΩ cm2, which is 3 orders of magnitude higher than that of the reference coating which was cured by 15 wt% AlPO4 at 120 °C. It is revealed that the impedance is strongly dependent on the amounts of micron-sized defects rather than the polymerization degree. The lower density the defects, including those formed during testing, the higher the impedance. The formation of defects which has a significant impact on the adhesion and anti-corrosion properties of the coating is mainly correlated to the curing kinetics.
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.
