| This paper presents the results of a study that was undertaken to inhibit the corrosion, scale and microorganism problems for open recirculating cooling system. This study has been carried out on a new multicomponent inhibitor blend composed of HEDP(1-hydroxy-ethylidine-1,1-diphosphonic acid)/zinc/acrylate copolymer/isothiazolone. The effect of newly developed inhibitor was studied through weight-loss tests, potentiodynamic polarization tests, scale tests, microorganism tests and surface analyses. The obtained results showed that developed inhibitor revealed a very good corrosion, scale and microorganism inhibition simultaneously. Potentiodynamic polarization curves indicated that blended inhibitor was a cathodic inhibitor. The surface analyses result indicated that the inhibitive effects arose from formation of a coherent protective film which may contain calcium-HEDP, zinc hydroxide, zinc-HEDP and iron oxide complex. |
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