Study of the performance of carbon steel AISI 1010 under the effect of epoxy/LDH-Zn-Al-NO₂^- coating barrier as corrosion inhibitor by electrochemical impedance spectroscopy

To extend the useful life of power distribution and transmission lines metal artifacts, a hydrotalcite like nanomaterial has been studied because of its function as a nanocontainer for corrosion inhibition. The layered double hydroxides (LDH) are called hydrotalcite like material, which are anion exchangers. Structurally, they consist of metal hydroxides with mixed positive charges separated by anionic and water molecules. Upon aggressive exposures, they can exchange ions with the environment, releasing a corrosion inhibition agent. In this research, three materials, (carbon steel 1010, carbon steel 1010 with epoxy resin and carbon steel 1010 with epoxy resin and the addition of 5% of LDH Zn-Al- NO₂^-) was analyzed by electrochemical impedance spectroscopy (EIS). The LDH was characterized by X-ray diffraction (XRD) and with Fourier transform infrared spectroscopy (FTIR). The results obtained evidenced the application of Zn-Al- NO₂ - in the elements of the power distribution and transmission lines, since they did conferred greater corrosion resistance to exposure and possible penetration of aggressive ions in the epoxy matrix (coating). (author)