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Copper phthalocyanine as corrosion inhibitor for ASTM A606-4 steel in 16% hydrochloric acid

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Abstract

A study based on the corrosion inhibition properties of copper phthalocyanine is described. Coverage degrees of copper phthalocyanine (Cu-phcy) on ASTM-A606-4 steel, obtained by weight loss measurements, were fitted to Langmuir, Frumkin, Temkin and Flory–Huggins adsorption isotherms. A better fit to the Langmuir isotherm was obtained. The polarization curves showed that polarization of both the anodic and cathodic reactions were verified for concentrations higher than 10−4 M, indicating a mixed type action. Only the anodic reactions were polarized for lower concentrations. At high frequencies the Nyquist diagrams showed one capacitive loop attributable to double layer charging and a small one at intermediary frequencies attributable to the faradaic process of hydrogen evolution. The formation of an adsorbed film was characterized by increasing charge transfer resistance values in the low frequency range for increasing inhibitor concentrations. According to the techniques used in this study, copper phthalocyanines showed a high corrosion inhibiting efficiency for all concentrations.

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Authors and Affiliations

  1. Departamento de Eng. Química., Escola Politécnica da Universidade de São Paulo, C.P. 61548, CEP 05424-970, São Paulo, SP, Brazil

    I.V. Aoki, I.C. Guedes & S.L.A. Maranhão

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  1. I.V. Aoki
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  2. I.C. Guedes
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  3. S.L.A. Maranhão
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Correspondence to I.V. Aoki.

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Aoki, I., Guedes, I. & Maranhão, S. Copper phthalocyanine as corrosion inhibitor for ASTM A606-4 steel in 16% hydrochloric acid. Journal of Applied Electrochemistry 32, 915–919 (2002). https://doi.org/10.1023/A:1020506432003

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