Inhibition of Pitting Corrosion of Some Austenitic Stainless Steel Samples in 2.5 M Nacl Solution by 3- Amino-1, 2, 4-Triazole
Ibrahim, Magdy; S. S. Abd El Rehim; M. M. Hamza;
Abstract
The effect of addition of 3-AMINO-1,2,4-TRIAZOLE (ATA) on general and pitting corrosion
of three Egyptian austenitic stainless steel samples, namely SS 304L (0.09 Mo), SS 304H
(0.43 Mo) and SS 304H (1.15 Mo) in aerated 2.5 M NaCl solution was investigated. The
measurements were carried out using potentiodynamic polarization and the Tafel lines
methods. The influence of temperature on the inhibition properties of ATA was
investigated. The results indicate that ATA is a good inhibitor for the samples under
investigation in 2.5 M NaCl solutions. In addition, the inhibition efficiency η% increases
with the inhibitor concentration while it decreases with increasing temperature. Moreover,
addition of ATA to 2.5 M NaCl solution leads to a shift of the pitting potential towards the
noble direction accounting for increased resistance to pitting attack. The inhibitive
properties of the ATA were explained on the bases of its adsorption on the stainless steel
samples and formation of adsorbed barrier layer, which resist the penetration power of Clion
and consequently decreases the rate of pitting corrosion. The adsorption of the
inhibitor obeys a Temkin adsorption isotherm. Examination of polarization curves indicates
that ATA acts as a mixed-type inhibitor.
of three Egyptian austenitic stainless steel samples, namely SS 304L (0.09 Mo), SS 304H
(0.43 Mo) and SS 304H (1.15 Mo) in aerated 2.5 M NaCl solution was investigated. The
measurements were carried out using potentiodynamic polarization and the Tafel lines
methods. The influence of temperature on the inhibition properties of ATA was
investigated. The results indicate that ATA is a good inhibitor for the samples under
investigation in 2.5 M NaCl solutions. In addition, the inhibition efficiency η% increases
with the inhibitor concentration while it decreases with increasing temperature. Moreover,
addition of ATA to 2.5 M NaCl solution leads to a shift of the pitting potential towards the
noble direction accounting for increased resistance to pitting attack. The inhibitive
properties of the ATA were explained on the bases of its adsorption on the stainless steel
samples and formation of adsorbed barrier layer, which resist the penetration power of Clion
and consequently decreases the rate of pitting corrosion. The adsorption of the
inhibitor obeys a Temkin adsorption isotherm. Examination of polarization curves indicates
that ATA acts as a mixed-type inhibitor.
Other data
Title | Inhibition of Pitting Corrosion of Some Austenitic Stainless Steel Samples in 2.5 M Nacl Solution by 3- Amino-1, 2, 4-Triazole | Authors | Ibrahim, Magdy ; S. S. Abd El Rehim ; M. M. Hamza | Keywords | Pitting corrosion; stainless steel; 3-amino-1, 2, 4-triazole; tafel lines; temkin. | Issue Date | 2014 | Publisher | ScienceDomain | Journal | Physical Science International Journal |
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