Abstract

MEGAHED, H.E.. Ethoxylated Fatty Esters as Corrosion Inhibitors for Copper in Nitric Acid Solutions. Port. Electrochim. Acta [online]. 2011, vol.29, n.4, pp.287-294. ISSN 0872-1904.

The effect of five compounds of ethoxylated fatty esters with different number of ethylene oxide units on the corrosion of copper in 1 M HNO₃ solution has been studied using weight loss and galvanostatic polarization techniques. The inhibition efficiency was found to increase with increasing concentration and number of ethylene oxide units per molecule. Inhibition effect was explained on the basis of adsorption of ethoxylated fatty esters on the metal surface through their ethoxy groups. The adsorption process was found to follow Temkin adsorption isotherm. Polarization data suggested that the used additives act as mixed type inhibitors. It was found also that the ethoxylated fatty esters provide a good protection to copper against pitting corrosion in chloride containing solutions.

Keywords : copper; ethoxylated fatty esters; corrosion inhibitors; pitting corrosion; adsorption.

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