Fabrication of ZnO‐functionalized polypyrrole microcomposite as a protective coating to enhance anticorrosion performance of low carbon mild steel

Abstract

In the present work, PPy, ZnO, and polypyrrole/zinc oxide (PPy/ZnO) microcomposites (1, 2, and 5 wt%) were prepared and their properties have been tuned for anticorrosion applications on low carbon mild steel. The synthesized products: ZnO, PPy, and composites were characterized by various sophisticated analytical techniques such as XRD, FTIR, Raman, FESEM, EDX, UV–VIS, TGA, and BET. The band frequencies observed at 480 and 588 cm−1 in FTIR spectrum correspond to stretching vibrations of Zn‐O and N‐H bonds, respectively, broadening of the bands in the composites indicate strong interactions between ZnO and PPy matrix. The potentiodynamic polarization study of PPy and PPy/ZnO composite was carried out in 3.5% NaCl solution to investigate the corrosion resistance efficiency. PPy/1 wt% ZnO (Icorr = 190 nA) composite coating on low carbon mild steel was observed to exhibit best corrosion protection property compared to PPy (121 μA), 2 and 5 wt% ZnO (242, 295 nA) composites. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48319.

Evaluation of corrosion behaviour of turmeric-coated AZ51 alloy in simulated body fluid for biomedical applications

“…The cathodic activities showing a decrease in the corrosion current densities. It is a well-established fact that a higher corrosion potential along with a lower corrosion current value leads to a better corrosion resistance of the sample [42,43]. When we compare this result with the table and the figure above, it is clearly visible from above that the 48-h coated sample shows a lower value of corrosion current among all the samples and a higher value of corrosion potential which is only less than the 96-h coated sample thereby gives the best combination of both the parameters among all samples and hence shows better corrosion resistance among all the samples.…”

A comparative study on the microstructure, hardness and corrosion resistance of epoxy coated and plain rebars

“…The measured values of the corrosion current from the polarisation resistance data were between 0.01 mA cm −2 to 0.6 mA cm −2 for the tested specimens, which depicts the corrosion current densities, as well as corrosion rates, are higher as evident from table 5. It is well-known that high corrosion potential and low corrosion current density determine better corrosion resistance [58]. It is evident from table 4 that the ECR samples show high corrosion potential values and low corrosion current values in both 1% HCl and 3.5% NaCl solution compared to that of plain rebars; thereby exhibiting a higher corrosion resistance of the ECR samples which is likely due to the presence of the epoxy coating on the surface that acts as a barrier to the entry of the corrosive ions into the sample surface.…”