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Document Type

Original Article

Subject Areas



electrochemical; STEEL ALLOYS; phosphoric acid


The behavior of two steel alloys in phosphoric acid solutions alone and with addition of organic and inorganic compounds was studied using open circuit potential and potentiodynamic polarization techniques. Open circuit potential measurements of the two stainless steel electrodes in different concentrations of H3PO4 showed that the rates of film thickening of the two electrodes are independent of the solution concentration. Potentiodynamic polarizations illustrate that, upon increasing Na3PO4 concentration in 0.5M H3PO4 the pH of the solutions changed in the range from 1.7 to 10.7 and the corrosion rate decreases. Electrode type (II) has inhibition efficiency more than electrode type (I). AT compound (3 amino 1, 2, 4-triazole) has proven to be efficient inhibitor for pitting corrosion of stainless steel in phosphoric acid solutions. The inhibition efficiency was increased by increasing the inhibitor concentration. The inhibitive property may be argued to the formation of a compact Fe-AT complex film on the electrode surface.

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