Phthalocyanine blue dye has been investigated as a carbon steel corrosion inhibitor in 0.5？M sulfuric acid by using polarization curves, electrochemical impedance spectroscopy, and gravimetric tests. Dye concentrations included 0, 100, 200, 400, 600, 800, and 1000？ppm, whereas testing temperatures were 25, 40, and 60°C. Results indicated that phtalocyanine blue is a good corrosion inhibitor with its efficiency increasing with the concentration up to 40°C, but it increases at 60°C. Inhibitor improves the passive film properties and it forms an adherent, compact, protective film, acting, therefore, as an anodic-type inhibitor. At 25 and 40°C the corrosion process was under charge transfer, whereas at 60°C the adsorption/desorption of some species from the metal surface controlled the corrosion process. 1. Introduction Organic compounds containing atoms such as nitrogen, sulphur, and oxygen are commonly used to reduce the corrosion attack on steel in acidic media. These compounds adsorb on the metal surface, block the active sites on the surface, and thereby reduce the corrosion process [1–6]. The inhibiting action of such compounds is based on the adsorption ability of their molecules, where the resulting adsorption film isolates the metal from the aggressive media. The corrosion inhibition of organic compounds is related to their adsorption properties. Adsorption depends on the nature and the state of the metal surface, on the type of corrosive environment, and on the chemical structure of the inhibitor [7]. Studies report that the adsorption of organic inhibitors mainly depends on some physicochemical properties of the molecule, related to its functional groups, to the possible steric effects and electronic density of donor atoms; adsorption is suppose, also to depend on the possible interaction of the -orbitals of the inhibitor with the d-orbitals of the surface atoms, which induce greater adsorption of the inhibitor molecules onto the surface of metal, leading to the formation of a corrosion protection film [8]. Recently, there has been a lot of attention paid to the use of organic dyes as potential corrosion inhibitors for different metalsenvironments [9–24]. Thus, Oguzie evaluated the use of Congo red [9], methylene blue [10], indigo blue [11], safranin-o, thymol blue, and fluorescein [12] as corrosion inhibitors for mild steel in acidic media, although in some cases they evaluated these dyes for aluminum in hydrochloric acid [13]. Alizarin yellow and Bromophenol blue have been used also but now studying the synergistic effect of iodide ions for the
References
[1]
L. R. Chauhan and G. Gunasekaran, “Corrosion inhibition of mild steel by plant extract in dilute HCl medium,” Corrosion Science, vol. 49, no. 3, pp. 1143–1161, 2007.
[2]
P. C. Okafor, M. E. Ikpi, I. E. Uwah, E. E. Ebenso, U. J. Ekpe, and S. A. Umoren, “Inhibitory action of Phyllanthus amarus extracts on the corrosion of mild steel in acidic media,” Corrosion Science, vol. 50, no. 8, pp. 2310–2317, 2008.
[3]
K. F. Khaled, “Inhibition of copper corrosion in 3.5% NaCl solutions by a new pyrimidine derivative: electrochemical and computer simulation techniques,” Journal of Solid State Electrochemistry, vol. 11, pp. 1743–1749, 2007.
[4]
M. Z. A. Rafiquee, S. Khan, N. Saxena, and M. A. Quraishi, “Investigation of some oleochemicals as green inhibitors on mild steel corrosion in sulfuric acid,” Journal of Applied Electrochemistry, vol. 39, no. 8, pp. 1409–1417, 2009.
[5]
H. Ashassi-Sorkhabi, B. Masoumi, P. Ejbari, and E. Asghari, “Corrosion inhibition of mild steel in acidic media by Basic yellow 13 dye,” Journal of Applied Electrochemistry, vol. 39, no. 9, pp. 1497–1501, 2009.
[6]
M. A. Quraishi, A. Singh, V. K. Singh, D. K. Yadav, and A. K. Singh, “Green approach to corrosion inhibition of mild steel in hydrochloric acid and sulphuric acid solutions by the extract of Murraya koenigii leaves,” Materials Chemistry and Physics, vol. 122, no. 1, pp. 114–122, 2010.
[7]
F. Bentiss, M. Traisnel, and M. Lagrenee, “Influence of 2,5-bis(4-dimethylaminophenyl)-1,3,4-thiadiazole on corrosion inhibition of mild steel in acidic media,” Journal of Applied Electrochemistry, vol. 31, no. 1, pp. 41–48, 2001.
[8]
I. A. Akpan and N. O. Offiong, “Inhibition of mild steel corrosion in HCl solution by ciprofloxacin drug,” International Journal of Corrosion, vol. 2013, Article ID 301689, 5 pages, 2013.
[9]
E. E. Oguzie, “Influence of halide ions on the inhibitive effect of congo red dye on the corrosion of mild steel in sulphuric acid solution,” Materials Chemistry and Physics, vol. 87, no. 1, pp. 212–217, 2004.
[10]
E. E. Oguzie, “Corrosion inhibition of mild steel in hydrochloric acid solution by methylene blue dye,” Materials Letters, vol. 59, no. 8-9, pp. 1076–1079, 2005.
[11]
E. E. Oguzie, C. Unaegbu, C. N. Ogukwe, B. N. Okolue, and A. I. Onuchukwu, “Inhibition of mild steel corrosion in sulphuric acid using indigo dye and synergistic halide additives,” Materials Chemistry and Physics, vol. 84, no. 2-3, pp. 363–368, 2004.
[12]
E. E. Ebenso and E. E. Oguzie, “Corrosion inhibition of mild steel in acidic media by some organic dyes,” Materials Letters, vol. 59, no. 17, pp. 2163–2165, 2005.
[13]
E. E. Oguzie, B. N. Okolue, E. E. Ebenso, G. N. Onuoha, and A. I. Onuchukwu, “Evaluation of the inhibitory effect of methylene blue dye on the corrosion of aluminium in hydrochloric acid,” Materials Chemistry and Physics, vol. 84, pp. 394–401, 2004.
[14]
E. E. Ebenso, H. Alemu, S. A. Umoren, and I. B. Obot, “Inhibition of mild steel corrosion in sulphuric acid using alizarin yellow GG dye and synergistic Iodide Additive,” International Journal of Electrochemical Science, vol. 3, pp. 1325–1339, 2008.
[15]
A. I. Onen, O. N. Maitera, J. Joseph, and E. E. Ebenso, “Corrosion inhibition potential and adsorption behaviour of bromophenol blue and thymol blue dyes on mild steel in acidic medium,” International Journal of Electrochemical Science, vol. 6, no. 7, pp. 2884–2897, 2011.
[16]
S. Deng, X. Li, and H. Fu, “Alizarin violet 3B as a novel corrosion inhibitor for steel in HCl, H2SO4 solutions,” Corrosion Science, vol. 53, no. 11, pp. 3596–3602, 2011.
[17]
H. Ashassi-Sorkhabi, D. Seifzadeh, and M. G. Hosseini, “EN, EIS and polarization studies to evaluate the inhibition effect of 3H-phenothiazin-3-one, 7-dimethylamin on mild steel corrosion in 1？M HCl solution,” Corrosion Science, vol. 50, no. 12, pp. 3363–3370, 2008.
[18]
M. A. Elmorsi and A. M. Hassanein, “Corrosion inhibition of copper by heterocyclic compounds,” Corrosion Science, vol. 41, no. 12, pp. 2337–2352, 1999.
[19]
S. Deng, X. Li, and H. Fu, “Acid violet 6B as a novel corrosion inhibitor for cold rolled steel in hydrochloric acid solution,” Corrosion Science, vol. 53, no. 2, pp. 760–768, 2011.
[20]
X. Li, S. Deng, and H. Fu, “Inhibition effect of methyl violet on the corrosion of cold rolled steel in 1.0？M HCl solution,” Corrosion Science, vol. 52, no. 10, pp. 3413–3420, 2010.
[21]
R. Q. Liu, L. Xiang, and X. G. Zhang, “Inhibition effect of methyl red on corrosion of steel in acidic solutions,” Corrosion Protection, vol. 22, pp. 98–99, 2001.
[22]
X. Li, S. Deng, H. Fu, N. Zhao, Y. Li, and G. Mu, “Corrosion inhibition of cresol red for cold rolled steel in phosphoric acid solution,” Corrosion Science and Protection Technology, vol. 21, no. 4, pp. 354–357, 2009.
[23]
J. Sathiyabama, S. Rajendran, J. A. Selvi, and A. J. Amalraj, “Methyl orange as corrosion inhibitor for carbon steel in well water,” Indian Journal of Chemical Technology, vol. 15, no. 5, pp. 462–466, 2008.
[24]
R. A. Prabhu, T. V. Venkatesha, and A. V. Shanbhag, “Carmine and fast green as corrosion inhibitors for mild steel in hydrochloric acid solution,” Journal of the Iranian Chemical Society, vol. 6, no. 2, pp. 353–363, 2009.
[25]
X. Li and G. Mu, “Tween-40 as corrosion inhibitor for cold rolled steel in sulphuric acid: weight loss study, electrochemical characterization, and AFM,” Applied Surface Science, vol. 252, no. 5, pp. 1254–1265, 2005.
