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Corrosion of Zinc in acetic acid derivatives: Glycollic, mercaptoacetic and cyanoacetic acids and glycine

✍ Scribed by Dr. H. A. Abd El-Rahman; A. G. Gad-Allah; H. Tamous

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
605 KB
Volume
29
Category
Article
ISSN
0933-5137

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✦ Synopsis

Abstract

The corrosion behaviour of zinc in glycollic, mercaptoacetic and cyanoacetic acids and glycine was studied by weight loss, pH‐monitoring and polarization measurements. The rate of corrosion was found to be a first order with respect to hydrogen ion activity and strongly dependent of the acid type. The abnormal behaviour in cyanoacetic acid at < 0.5 M was attributed to the hydrolysis of the acid during the corrosion and formation of malonic acid as confirmed by FT‐IR spectroscopy. Morphological investigation of the corroded surfaces showed localized corrosion in cyanoacetic and glycollic acids which increased as the acid concentration or corrosion time increased. The FT‐IR analysis indicated also the formation of zinc glycollate and zinc thioglycollate as the corrosion products of zinc in glycollic and mercaptoacetic acids, respectively (Scheme 1a+b).

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