An Insight into Further Limitation of the Use of Thermo-metric Method for Determination of Corrosion Inhibition Efficiency of Zn in Hydrochloric Acid Solution

A.M. El-Kot* and A.R. Ismail

Chemistry Department, Faculty of Science Zagazig University, Zagazig, Egypt

Abstract

The effect of some amino compounds on the dissolution of zinc in hydrochloric acid solution was determined by the thermometric and weight loss methods. The two methods gave different results. The thermometric method shows that these compounds act as corrosion inhibitors, but the weight loss method shows that these compounds are efficient accelerators. The mechanism of Donnely lends support to the results of weight loss method. So the thermometric method for determining dissolution rates in these conditions can be unreliable.

Keywords

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  • Asian J. Chem. /
  •  1991 /
  •  3(4) /
  •  pp 432-439