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00438 DEVELOPMENT OF PRETREATMENTS FOR COOLING WATER SYSTEMS

Picture for 00438 DEVELOPMENT OF PRETREATMENTS FOR
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Product Number: 51300-00438-SG
ISBN: 00438 2000 CP
Author: Mark A. Moore, Abdullah I. Mahrous, Paul Frazer and Sulaiman A1-Jutaily
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When first installed, cooling water systems contain contaminants associated with fabrication, such as grease, dirt, debris and mill scale. Without an effective clean-up procedure the presence of dirt can lead to the early onset of corrosion, as inhibitors are unable to form protective films on a surface contaminated with grease or rust. This study investigated several proprietary cleaning and pre-filming procedures to determine which produced protective, passive films prior to the commissioning of new plants. The main conclusions from this study are: • Alkaline degreasing produces the cleanest surface. • Alkaline degreasing agents should not be used if the system contains copper alloys. • Acidic cleaner is the most efficient rust remover. • The best passivation and corrosion control was given by a phosphate/polymer treatment.
When first installed, cooling water systems contain contaminants associated with fabrication, such as grease, dirt, debris and mill scale. Without an effective clean-up procedure the presence of dirt can lead to the early onset of corrosion, as inhibitors are unable to form protective films on a surface contaminated with grease or rust. This study investigated several proprietary cleaning and pre-filming procedures to determine which produced protective, passive films prior to the commissioning of new plants. The main conclusions from this study are: • Alkaline degreasing produces the cleanest surface. • Alkaline degreasing agents should not be used if the system contains copper alloys. • Acidic cleaner is the most efficient rust remover. • The best passivation and corrosion control was given by a phosphate/polymer treatment.
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