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1-Methyl-3-pyridine-2-yl-thiourea as inhibitor for acid corrosion of stainless steel

✍ Scribed by S. M. A. Hosseini; M. Salari; M. Ghasemi

Publisher
John Wiley and Sons
Year
2009
Tongue
German
Weight
343 KB
Volume
60
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

The inhibiting effect of 1‐methyl‐3‐pyridine‐2‐yl‐thiourea (MPT) on the corrosion of stainless steel in 0.5 M H~2~SO~4~ solution was investigated using weight loss and potentiostatic polarization techniques. The percentage inhibition efficiencies and surface coverage degrees increased with increasing additive concentration. Potentiostatic polarization studies revealed that MPT is of the mixed‐type inhibitor in 0.5 M H~2~SO~4~ solution. The adsorption of this inhibitor is also found to obey the Langmuir adsorption isotherm. From the adsorption isotherm, value of the Δ__G__~ads~ for the adsorption process was calculated. From the corrosion rate obtained at 25–55 °C E~a~, Δ__H__~a~ and possible mechanism have been proposed. Scanning electron microscopy (SEM) was done from the surface of the exposed sample indicating uniform film on the surface.

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