Electrochemical evaluation of natural extracts as effective corrosion inhibitors and surface treatments on metal substrates

Corrosion is a serious problem encountered in the industry, protection from it is more than necessary using inhibitors and treatments. These treatments can effectively ease the problem on the surface of the material substrate, particularly the metal substrate for being easily etched during usage and being unable to withstand abrasion. Experimental results showed that the extracts are effective inhibitors of corrosion. Polarization tests indicate that the inhibitors are of mixed nature and the corrosion mechanism does not change after their addition to the solution. The electrochemical impedance spectroscopy confirmed that inhibitory quality and surface treatments improved corrosion resistance. Surface analysis revealed that the surface of the sample for the control solution was covered and protected. However, for the inhibited solutions the presence of oxides was not observed.