The effect of aniline derivatives on the rate of cementation of copper from dilute copper sulfate solution on iron rods was investigated. The variables studied were concentration Of CuSO4, temperature, organic additives, and their concentrations. It was found that the cementation reaction was first-order in the presence and in the absence of additives. Nitrogen compounds were found to decrease the rate of cementation by 10 to 80% depending on the type of inhibitor as well as its concentration. The adsorption isotherm, the effect of temperature, and the percentage inhibition show that the order of inhibition isp-chloroaniline > o-chloroaniline > m-chloroanilineandp-chloroaniline > p-aminobenzoic acid > p-aminoacetophenone.The thermodynamic parameters DeltaS(not equal), DeltaG(not equal), DeltaH(not equal) were given. (C) 2003 Elsevier Inc. All rights reserved.