Poly (m-aminophenol) as a Corrosion Inhibitor for Low Carbon Steel (AISI C1010)
- Gada, A. Abd-EL- Fattahb, H. EL-Nagarc.
a&bDepartment of Materials Science, Institute of Graduate Studies and Research, Alexandria University, 163 Horrye Avenue, EL-Shatby, P.O.Box 832, Alexandria ,Egypt.
cAlexandria National Refining and Petrochemicals Co. (ANRPC). Alexandria, Egypt.
Abstract
This study involves a preparation of poly (m-aminophenol) by chemical oxidative polymerization of m-aminophenol (m-AP) using ammonium persulfate (APS) or potassiumdichromate (K2Cr2O7) as oxidative initiators and sulfuric acid (H2SO4) or hydrochloric acid (HCl) as dopants with polymer yield 98%. It is found that poly (m- aminophenol) is insoluble in common organic solvents, aqueous NaOH and partially soluble in conc. HCl and H2SO4. The prepared polymer was characterized by FTIR, TGA, XRD, and SEM. The anti-corrosion behavior of poly ( m- aminophenol) (30, 60,120 ppm) at room temperature in low carbon steel (AISI C1010) has been investigated in aqueous HCl (1.5 M) and NaCl (3.4 M) solutions using electrochemical impedance spectroscopy (EIS) and weight loss measurements. From weight loss measurements it was found that the corrosion inhibitor efficiencies (%IE) of PmAP of 30, 60,120 ppm in aqueous HCl solution (1.5 M) are (86.5, 88.6, 85.7 %) respectively and it is in aqueous solution of NaCl (3.4 M) are (93.1, 93.9, 92.1 %) respectively. From electrochemical impedance spectroscopy (EIS) it was found that the corrosion inhibitor efficiency (%IE) of PmAP (30, 60,120 ppm) in aqueous HCl solution (1.5 M) is (91.4, 94.0, 90.4 %) respectively. From economic comparison between poly (m- aminophenol) with other inhibitors it can be seen that the poly (m- aminophenol) inhibitor has lower economic cost and higher saving (52 – 74 %) compared to the other inhibitors which are used in the Egyptian market.