SUDAN III AS CORROSION INHIBITOR FOR CARBON
STEEL ST37-2 IN H2SO4SOLUTIONS
الباحث الأول:
Saad Aziz Hassan
الباحثين الآخرين:
Ali Kadhim Hadi
المجلة:
International Journal of Recent Scientific Research Research
Vol. 6, Issue, 7, pp.5445-5453, July,
تاريخ النشر:
None
مختصر البحث:
Abstract
A study on the use of sudan III dye as corrosion
inhibitor for carbon steel ST37-2 in aerated 0.01,0.5x10
5 M H2…
Abstract
A study on the use of sudan III dye as corrosion
inhibitor for carbon steel ST37-2 in aerated 0.01,0.5x10
5 M H2SO4solutions has been carried out by using potentiodynamic polarization technique. The corrosion
parameters such as, corrosion rates, corrosion potential ,corrosion current ,inhibition efficiency and Tafel
slopes were evaluated. The effect of temperature on the corrosion behaviour of carbon steel in H2SO4
solutions with and without addition of 5,25,50,100 and 150ppm of sudan III was studied in the
temperature range 303-333 K. It was found that sudan III has been proved to be good inhibitor in 0.01 ,
0.5x10-5M H2SO4 attaining its highest efficiency, 50% and 99% respectively and though temperature
rising. This reduction in the corrosion rate was due to the formation of an external layer formed by sudan
III which was adsorbed physically and chemically on the carbon steel ST37-2 surface. Sudan III acted as
a mixed type of inhibitor. Values of the activation energies (Ea), enthalpies (ΔH*),Gibbs free energies
(ΔG*),entropies of activation (ΔS*),besides the thermodynamic parameters of corrosion and adsorption
provided evidence of the inhibitory effect of sudan III. Langmuir isotherm model fitted well the adsorption
process onto carbon steel surface in H2SO4 solution
