Investigate the Corrosion Inhibition of Mild Steel in Sulfuric Acid Solution by Thiosemicarbazide - Open Journal of Physical Chemistry

OJPC > Vol.6 No.3, August 2016

Open Journal of Physical Chemistry

Volume 6, Issue 3 (August 2016)

ISSN Print: 2162-1969 ISSN Online: 2162-1977

Google-based Impact Factor: 0.32 Citations

Investigate the Corrosion Inhibition of Mild Steel in Sulfuric Acid Solution by Thiosemicarbazide ()

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Download as PDF (Size: 3422KB) PP. 54-66

DOI: 10.4236/ojpc.2016.63006 2,853 Downloads 6,494 Views Citations

Author(s)

Fatma Mohamed Mahgoub^1,2*, S. M. Al-Rashdi³

Affiliation(s)

¹Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, KSA.
²Institute of Graduate Studies and Research, University of Alexandria, Alexandria, Egypt.
³Chemistry Department, Faculty of Science, Umm Al-Qura University, Makka, KSA.

ABSTRACT

Corrosion inhibition of mild steel in 0.5 mol/L H₂SO₄ was investigated in the absence and presence of different concentrations of thiosemicarbazide. The inhibition efficiency of thiosemicarbazide was studied by electrochemical impedance methods, potentiodynamic polarization and scanning electron microscopy at different inhibitor concentrations. Inhibition efficiency, corrosion rate and surface coverage were evaluated at different concentrations of thiosemicarbazide. Electrochemical impedance plots indicated that the presence of the inhibitors increased the charge transfer resistance of the corrosion process, increasing the inhibition efficiency. Polarization curves showed that this compound acted as mixed type inhibitor. The results of the investigation showed that this compound had good inhibiting properties for mild steel corrosion in 0.5 M sulfuric acid. The adsorption isotherm studies showed that Thiosemicarbazide adsorbed chemisorbed and formed a stable surface complex on the mild steel surface. And Langmuir obeyed the adsorption isotherm. Scanning electron microscopy analysis shows that, the surface morphology of the polished mild steel in the presence of thiosemicarbazide as inhibitor is smoother surface as compared with polished mild steel specimen in the absence of inhibitor.

KEYWORDS

Acidic Medium, Adsorption, Inhibitor Mild Steel and SEM

Share and Cite:

Mahgoub, F. and Al-Rashdi, S. (2016) Investigate the Corrosion Inhibition of Mild Steel in Sulfuric Acid Solution by Thiosemicarbazide. Open Journal of Physical Chemistry, 6, 54-66. doi: 10.4236/ojpc.2016.63006.

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