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07065 A New Look at Azoles

Picture for 07065 A New Look at Azoles
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Product Number: 51300-07065-SG
ISBN: 07065 2007 CP
Author: Eric C. Ward and Dane E. Glaser
Publication Date: 2007
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This paper presents laboratory studies that will attempt to debunk some of the myths associated with azoles. Studies will be presented that show that azoles are not significantly affected by high concentrations of halogenated biocides (particularly bromine). The azoles actually perform remarkably well when residual inhibitor is present, even at extremely high dosages of free bromine. Unfortunately, the azoles have a much greater weakness that is not strongly emphasized in the industry today. The azole film has been found to be extremely delicate in a cooling water environment, regardless of the presence of halogenated biocides. The need to maintain a residual level of azole in the water is not simply a recommendation to provide an added sense of security; it is an absolutely critical measure to maintain acceptable protection of the yellow metal surfaces. As soon as residual azole is removed from solution, the film begins to break down, causing an almost instantaneous increase in corrosion rates. Any presence of halogenated biocides will only serve to accelerate these corrosion rates further. Electrochemical test methods and pilot studies will be presented that help to demonstrate these findings.
This paper presents laboratory studies that will attempt to debunk some of the myths associated with azoles. Studies will be presented that show that azoles are not significantly affected by high concentrations of halogenated biocides (particularly bromine). The azoles actually perform remarkably well when residual inhibitor is present, even at extremely high dosages of free bromine. Unfortunately, the azoles have a much greater weakness that is not strongly emphasized in the industry today. The azole film has been found to be extremely delicate in a cooling water environment, regardless of the presence of halogenated biocides. The need to maintain a residual level of azole in the water is not simply a recommendation to provide an added sense of security; it is an absolutely critical measure to maintain acceptable protection of the yellow metal surfaces. As soon as residual azole is removed from solution, the film begins to break down, causing an almost instantaneous increase in corrosion rates. Any presence of halogenated biocides will only serve to accelerate these corrosion rates further. Electrochemical test methods and pilot studies will be presented that help to demonstrate these findings.
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