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| INHIBITION EFFECT OF RED TETRAZOLIUM ON COLD ROLLED STEEL IN H3PO4 SOLUTION |
| LI Xianghong1; DENG Shuduan2; FU Hui1; BAI Wei3 |
1. Department of Fundamental Courses; Southwest Forestry University; Kunming 650224
2. Department of Wood Science and Technology; Southwest Forestry University; Kunming 650224
3. School of Chemistry and Bio-Science; Yunnan Nationalities University; Kunming 650031 |
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Abstract The inhibition effect of red tetrazolium on the corrosion of cold rolled steel (CRS) in 1.0 mol/L~10.0 mol/L H3PO4 solution has been studied by mass loss and potentiodynamic polarization methods. Atomic force microscope (AFM) provided the CRS surface conditions. The results show that neutral red tetrazolium is a moderate inhibitor for CRS. Inhibition efficiency increases with the inhibitor concentration, while decreases with increasing the temperature. The adsorption of red tetrazolium on the CRS surface follows the Freundlich adsorption isotherm equation. The experimental data have been treated with adsorption thermodynamic and corrosion kinetic equations. Three adsorption thermodynamic parameters (adsorption free energy ΔG0, adsorption heat Δ H0, adsorption entropy Δ S0) and two kinetic parameters (corrosion ratek, kinetic reaction constant B) are also calculated. The inhibitive mechanism is discussed in detail according to the parameters. The results show that the adsorption process is a spontaneous and exothermic process accompanied by a decrease in entropy. The corrosion of cold rolled steel in H3PO4 support the kinetic equation proposed by Mathur and Vasudevan. The rate constant k and kinetic reaction constant B decreased after adding red tetrazolium. Polarization curves show that red tetrazolium is a mixed-type inhibitor, and its inhibition on CRS is caused by geometric blocking effect. AFM results show that the introduction of red tetrazolium into H3PO4 solution results in decreasing the surface roughness.
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Received: 06 October 2008
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Corresponding Authors:
LI Xianghong
E-mail: xianghong-li@163.com
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