The use of organic compounds as corrosion inhibitors may be the main choice to reduce the corrosion rate of alloys in acidic media. Presence of unique atoms such as N, O and S in heterocyclic compounds determines both efficiency and adsorption mechanism. In recent years, the quantum chemical method has presented an insight toward identifying the relation between molecular structure of inhibitors and their adsorption mechanism. However, it is not capable method to describe the dissolution mechanism of metals. In this way, the electrochemical methods can be valuable techniques to recognize mechanism of dissolution. Consequently, the aim this work is devoted to study the iron dissolution behavior in the presence of 2-pyrildyl disulfide (see Fig.1) in 0.1 M HCl using electrochemical techniques. CK15 mild steel was selected as working electrode and saturated calomel and platinum wire as reference and counter electrodes.

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