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A Comparative Study For The Effect Of S--Ions On The Corrosion Of Cu, Cu-Zn And Cu-Ni In 3.4% NaCl In Presence Of Sodium Lauryl Sulfate As Inhibitor

H.A.El-Dahan

A comparative study for the effect of sulfide ions concentrations on the corrosion of Cu, Cu-Zn (70/30) and Cu-Ni (90/10) in NaCl solution (3.4%) in presence of sodium lauryl sulfate (SLS) as inhibitor was studied using weight loss and potentiodynamic curves (Tafel lines). In low S-- polluted salty water, the mean corrosion rate of the copper and its alloys increases, while in highly polluted salty water, the corrosion rate decreases. Generally the corrosion rates reveal good corrosion inhibition for Cu and its alloys in sulfide polluted salty water. The electrochemical corrosion parameters were obtained at different inhibitor concentrations. Tafel cathodic slopes in inhibited polluted salty water are considerable lower than those in uninhibited polluted salty solution. This points to cathodic control of the inhibitor. Moreover, the corrosion current density (Icorr.) decreased while the inhibition efficiency percent (I.E.,%) increased in presence of SLS. The inhibition effect of SLS was attributed to the adsorption of the inhibitor molecules on the coupons surfaces. ï›™ 2006 Trade Science Inc. - INDIA