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Corrosion inhibition study of sodium dodecyl benzene sulphonate to zinc-aluminium alloys in 1N HCl solution

Author(s): R.D.Pruthviraj

The corrosion inhibition of Zn-Al alloys are the subject of tremendous technological importance due to the increased industrial applications of these materials. This paper reports the results of weight lossmeasurements on the corrosion inhibition ofZn-Al, [(Zn-Al+2%Si) (Zn-Al+4%Si) (Zn-Al+6%Si)] alloys in 1.0 M HCl in the lab temperature using sodium dodecyl benzene sulphonate as an anionic surfactant (AS) inhibitor. The results showed that the addition of the surfactant inhibits the hydrochloric acid corrosion of the FourZn- Al samples. The inhibition occurs through adsorption of the surfactant on the metal surface without modifying the mechanism of corrosion process. The surfactant acts predominately as cathodic inhibitor. The inhibition efficiency increases with an increase in the surfactant concentration. Maximum inhibition is observed around its critical micelle concentration (CMC). The inhibition efficiency for the FourZn- Al samples decreases in the order: (Zn-Al+6%Si)> (Zn-Al+4%Si)> (Zn-Al+2%Si) >Zn-Al. (Al+6%Si)>(Al+6%Cu)>Al.. Results obtained from the this method are in good agreement.

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