Inhibition of corrosion of SS 18/8 alloy is sea water by Thiourea-Zn2+ system

Susai Santhammal Rajendran; Thankappan Sasilatha; Antony John Amalraj

doi:10.5937/zasmat2103191J

Authors

Susai Santhammal Rajendran St. Antony's College of Arts and Sciences for Women, PG and Research Department of Chemistry, Corrosion Research Centre, Thamaraipady, Tamil Nadu, India Author
Thankappan Sasilatha AMET University, Department of EEE, Chennai, India Author
Antony John Amalraj EVR Government College, PG and Research Department of Chemistry, Trichy, India Author

DOI:

https://doi.org/10.5937/zasmat2103191J

Keywords:

sea water corrosion, SS 18/8 alloy pipelines, SS 18/8 alloy hull plates, Thiourea-Zn2+ system, Langmuir adsorption isotherm

Abstract

The corrosion resistance of SS 18/8 in natural sea water, in presence of an inhibitor named Thiourea-Zn2+ has been evaluated. Weight loss method, polarization study and AC impedance spectra have been employed to evaluate the corrosion resistance of SS 18/8 alloy in natural sea water, in presence of an inhibitor named Thiourea-Zn2+ system. Weight loss method reveals that Thiourea-Zn2+ system offers a maximum corrosion inhibition efficiency of 95% in controlling corrosion of SS 18/8 alloy in natural sea water. Synergism parameters are found to be greater than 1, confirming the synergistic effect existing between Thiourea-Zn2+. Adsorption of inhibitor molecules on the metal surface obey Langmuir adsorption isotherm. Polarisation study reveals that the inhibitors named Thiourea-Zn2+ system functions as mixed type of inhibitor. AC impedance spectra confirm the formation of a protective film on the metal surface. This formulation of Thiourea-Zn2+ may be used in cooling water systems where SS 18/8 alloy pipelines are used to carry sea water which is used as coolant. Also, Thiourea-Zn2+ coating can be given on SS 18/8 alloy to protect it from corrosion by sea water when SS 18/8 alloy is used as hull plates in ship industry.

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