The dependence of the corrosion rate of a 0·06 % C steel upon the pH and chloride ion activity of solutions of hydrochloric acid at 30°–50° has been examined. A significant amount of simultaneous chemical dissolution takes place as the strength of acid is increased and this leads to anomalously high values of the Tafel parameters, and renders the Stern ‘polarisation resistance’ treatment inoperative. Additions of thiourea produce cathodic stimulation at low concentrations and general inhibition at high concentrations. The results are mterpreted in terms of thiourea dissociation to hydrosulphide ion.
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Oakes et al. (1969) studied this question.
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