Effect of oil-in-water emulsions on the performance of carbon dioxide corrosion inhibitors
Gulbrandsen, E.
,
Kvarekvål, J.
Corrosion, Vol. 63, no. 2 (2007), 187-196
2007
article
The effect of oil-in-water emulsions on the performance of four CO2 corrosion inhibitors was studied. A refined, low-aromatic, white spirit product was used as the oil phase. Oil-in-water emulsions were formed by injecting small amounts of oil in the impinging jet stream. This created small amounts of emulsion (on the order of 1 vol % to 2 vol % oil) that broke down in a few hours. The sensitivity of the inhibitors to oil-in-water emulsions was strongly dependent on the inhibitor formulation. Two of the tested inhibitor products showed reduced inhibitor performance in the presence of the emulsion. One product was slightly affected. The performance of the fourth product improved in the presence of the emulsion. The loss of inhibition was caused by depletion of inhibitor in the aqueous phase as a result of adsorption Inhibitor onto the emulsion droplets. The improved performance observed with one inhibitor suggested that this inhibitor stimulated the formation of a thin oil film at the steel surface. Emulsion droplet formation was caused by fluid shear forces. Copyright © 2007 Elsevier
bibl@ife.no
