International Journal of Chemical Studies
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P-ISSN: 2349-8528, E-ISSN: 2321-4902   |   Impact Factor: GIF: 0.565 NAAS Rating: 5.31 NEW

International Journal of Chemical Studies

Vol. 4, Issue 1 (2016)
Inhibition effect of ammonium dichromate on the corrosion of aluminium in phosphoric acid


Author(s): KN Rathod, RT Vashi

Abstract: The inhibition effect of ammonium dichromate on the corrosion of aluminium in phosphoric acid was investigated by weight loss method, Potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) measurements. The study revealed that as the concentration of acid increases corrosion rate increases. Inhibition efficiency (I.E.) increases as the concentration of inhibitor increases. The investigation of adsorption isotherm indicate that the inhibitor fit Langmuir isotherm, fairly good. The phenomenon of physisorption is attributed to the values of Ea, Qads and ΔG0ads. The Potentiodynamic polarisation result reveals that the inhibitor act as mixed type inhibitor. Percentage I.E. of inhibitor was found almost similar by weight loss, polarisation and by EIS methods.

Pages: 37-42  |  1020 Views  19 Downloads

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How to cite this article:
KN Rathod, RT Vashi. Inhibition effect of ammonium dichromate on the corrosion of aluminium in phosphoric acid. Int J Chem Stud 2016;4(1):37-42.
International Journal of Chemical Studies