Abstract
The synergistic inhibitory action of cetylpyridinium chloride (CPC) and different halides on the corrosion of mild steel in 0.5 M H2SO4 has been investigated using electrochemical methods and scanning electron microscopy (SEM). Experimental results showed that the protection efficiency (P-icor) of CPC improved in the presence of the different halides with different extents. Chemisorption was proposed from the trend of P-icor and the values of Delta G(ads)(0). The synergism parameter is found to be greater than unity indicating that the enhanced P-icor caused by the addition of the halides to the CPC is due to a co-operative adsorption of both species. (C) 2012 Elsevier Ltd. All rights reserved.