the decreasing in viscosity of the inhibitor solution then increasing the diffusion of ions in solutions and the decreasing the stability of protective film on metal surface that leads to decrease the activity of the inhibitor. Increasing temperature also increases the diffusion of ions in solutions and decrease the stability of protective film on metal surface which leads to decrease activity of the inhibitor. But at 35.40˚C, the inhibition efficiency increasing as increasing temperature due to the adsorbed process via chemical mode due increasing efficiency with increasing temperature, the shifting in Ecorr value toward positive direction    .
The inhibition characteristics of compound (ASC) were studied for iron corrosion in formation water. Electrochemical (Tafel polarisation and EFM) method was applied. Polarisation measurements showed that the compound (ASC) acted as cathodic inhibitor. The surfactants chemisorbed on the electrode surface without modifying the mechanism of anodic and cathodic reactions. The cathodic process is activation controlled even in the presence of surfactant. The inhibition efficiency of the surfactants generally increases with the increasing in surfactant concentration. From these results the ammonium sulfonated castor oil (ASC) can be used as anti-corrosion inhibitor for pipeline of crude oil.
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