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Surface Protection of Carbon Steel by Hexanesulphonic Acid-Zinc Ion System

  • Anbarasi C
  • Rajendran S
ISRN Corrosion (2014) 2014 1-8
DOI: 10.1155/2014/628604
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Abstract

Inhibition of corrosion of carbon steel in dam water by hexanesulphonic acid as its sodium salt C 6 H 13 SO 3 Na (SHXS) in the absence and presence of a bivalent cation zinc ion (Zn 2 ΓΎ ) has been investigated using weight loss method. Results of weight loss method indicate that inhibition efficiency (IE) increased with increase of inhibitor concentration. Polarization study reveals that SHXS-Zn 2+ system controls the cathodic reaction predominantly. AC impedance spectra reveal that a protective film is formed on the metal surface. The nature of the metal surface has been analysed by Fourier Transform Infrared Spectroscopy (FTIR) and Atomic Force Microscopy (AFM).

Figures

  • Table 3: Synergism Parameter (𝑆 𝐼 ).
  • Table 1: Water analysis.
  • Figure 1: Polarisation curves of carbon steel immersed in various test solutions. (a) Dam water. (b) Dam water containing 1.35 Γ— 10βˆ’3 mol/L of SHXS and 1.04 Γ— 10βˆ’4 mol/L of Zn2+.
  • Table 2:The corrosion inhibition efficiencies and the corresponding corrosion rates (mm/year) of SHXS-Zn2+ system.
  • Table 4: Corrosion parameters of carbon steel immersed in dam water in the presence and absence of inhibitor obtained by polarization method.
  • Figure 2: AC impedance spectra of carbon steel immersed in various test solutions. (a) Damwater. (b) Damwater containing 1.35 Γ— 10βˆ’3mol/L of SHXS and 1.04 Γ— 10βˆ’4mol/L of Zn2+.
  • Figure 3: Equivalent electrical circuit diagram. 𝑅 𝑠 = solution resistance. 𝑅ct = charge transfer resistance. 𝐢dl = double layer capacitance.
  • Table 5: Impedance parameters of carbon steel in dam water in the presence and absence of inhibitor obtained by AC impedance method.

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APA

Anbarasi, C. M., & Rajendran, S. (2014). Surface Protection of Carbon Steel by Hexanesulphonic Acid-Zinc Ion System. ISRN Corrosion, 2014, 1–8. https://doi.org/10.1155/2014/628604

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