Effect of hexamethylpararosaniline chloride (crystal violet) on mild steel corrosion in acidic media

被引：114

作者：

Oguzie, E. E. ^{[1
]}

Njoku, V. O. ^{[2
]}

Enenebeaku, C. K. ^{[1
]}

Akalezi, C. O. ^{[1
]}

Obi, C. ^{[3
]}

机构：

[1] Fed Univ Technol Owerri, Dept Chem, Electrochem & Mat Sci Res Lab, Owerri, Nigeria

[2] Imo State Univ, Dept Chem, Owerri, Nigeria

[3] Univ Port Harcourt, Dept Chem, Port Harcourt, Nigeria

来源：

CORROSION SCIENCE | 2008年 / 50卷 / 12期

关键词：

Mild steel; Weight loss; Acid corrosion; Acid inhibition;

D O I：

10.1016/j.corsci.2008.09.017

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion inhibition of mild steel in 0.5 M H(2)SO(4) and 1 M HCl by hexamethylpararosaniline chloride (HMPC) was investigated using the gravimetric technique in the temperature range 303-333 K. The results indicate that HPMC inhibited the corrosion reaction in both acid media at all temperatures and inhibition efficiency increased with HMPC concentration. The inhibiting action is attributed to general adsorption of protonated and molecular HPMC species on the corroding metal surface. Adsorption followed a modified Langmuir isotherm and the Temkin isotherm, with very high negative values of the free energy of adsorption (Delta G(ads)(0)). An increase in temperature reduced the inhibition efficiency of HPMC in 0.5 M H2SO4 but increased efficiency in 1 M HCl. Activation parameters such as activation energy (E(a)), activation enthalpy (Delta H(center dot)) and activation entropy (Delta S(center dot)) as well as the adsorption heat (Q(ads)) were evaluated from the effect of temperature on corrosion and inhibition processes. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：3480 / 3486

页数：7

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