Combatting Localized Galvanic Corrosion at Bolted Connections in Gravity Sludge Thickeners and Clarifiers

From JPCL, September 2020

By R. A. Nixon, Corrosion Probe, Inc.; Corrosion Testing Laboratories, Inc.

Localized galvanic corrosion of coated carbon steel rake mechanisms at stainless steel bolted connections can result in significantly high corrosion rates, particularly when connections are overtightened in gravity sludge thickeners and clarifiers. This article explains this issue and presents a typical case history to demonstrate successful measures that can be taken to prevent this prevalent problem....


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