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Anodic Tafel behaviour of mild steel in presence of inhibitors

✍ Scribed by Dr. M. W. Khalil

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
473 KB
Volume
23
Category
Article
ISSN
0933-5137

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✦ Synopsis

Abstract

The kinetics of mild steel dissolution in 1.0 N H~2~SO~4~ and 1.0 N HCl were studied by steady‐state anodic vs potential measurements in presence of varying concentrations of thiourea (TU) and thiosemicarbazide (TSC). An anodic Tafel slope of 38–40 mV/decade was observed in both acids in accordance with the Bockris model. The anodic Tafel slope increases regularly with increasing the inhibitor concentration. A mechanism is proposed – after Kelly – to explain this effect semiquantitatively. A surface complex is assumed to be formed between the adsorbed inhibitor and the dissolution reaction intermediates. A change of the rds for iron dissolution in presence of the inhibitor, is suggested.

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## Abstract Ellipsometry has been used to study the influence of Benzylamine, Benzotriazole and Hexamethylenetetramine on the growth of anodic oxides on iron and on AISI 304 stainless steel in borate‐buffer solutions. On iron, a limitation of the growth‐rate has been observed for these substances