Recently, there has been much interest in greener alternatives to molybdate to control corrosion in closed cooling water systems. Driving forces such as environmental restrictions and the cost of molybdate have made the use of molybdate less desirable. This paper discusses the use of phosphinosuccinate oligomers (PSO) in closed cooling water systems. The use of PSO and factors affecting the use of PSO are described, based on laboratory work and field studies.
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