SERS AND ELECTROCHENICAL STUDY OF INHIBITION MECHANISM OF THIOUREA ON IRON IN H_2SO_4 SOLUTION

J Chin Soc Corr Pro

1998, Vol. 18

Issue (1): 14-20 DOI:

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SERS AND ELECTROCHENICAL STUDY OF INHIBITION MECHANISM OF THIOUREA ON IRON IN H_2SO_4 SOLUTION

XU Hai-bo YU Jia-kang DONG Jun-hua LIN Hai-chao CAO Chu-nan(State Key Lab. for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015)

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Abstract

The inhibitive action of thiourea (TU) on the corrosion behaviour of iron was investigated in 0.5mol/L H2SO4 solution by means of SERS spectra and electrochemical measurements. TU inhibited the cathodic and anodic reactions of iron. The inhibitor effectiveness increased with its concentration, reached a maximum (at about 1.25mol/L) and then decreased. TU in low concentrations inhibited the anodic reaction of iron by adsorption on active sites; TU in high concentrations participated in the anodic reaction of iron, and followed a Langmuir-type isotherm. The corresponding kinetics parameters were VTU =l,ba=118mV. TU was adsorbed mainly parallel to iron surface at low concentrations. However, TU inclined to be perpendicular to the surface as its concentration become higher.

Key words: SERS Thiourea Inhibitor Adsorption

Received: 25 February 1998

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XU Hai-bo YU Jia-kang DONG Jun-hua LIN Hai-chao CAO Chu-nan(State Key Lab. for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015). SERS AND ELECTROCHENICAL STUDY OF INHIBITION MECHANISM OF THIOUREA ON IRON IN H_2SO_4 SOLUTION. J Chin Soc Corr Pro, 1998, 18(1): 14-20.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I1/14

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