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Wastewater Clarifiers: Understanding Corrosion Mechanisms

From JPCL, June 2018

More items for Program/Project Management

By D. A. Sherman, P.E. and R. A. Nixon, Corrosion Probe, Inc.

Wastewater treatment plant clarifier environments present challenges for selecting construction materials. Coated carbon steel, hot-dip galvanized steel and stainless steel are most commonly specified for new or refurbished clarifier mechanisms, and all have their advantages and disadvantages with regard to achieving the intended design life. This article discusses the corrosive conditions in primary and secondary clarifiers; how various process conditions can affect the corrosion mechanisms; in what situations each of these construction materials is or is not appropriate; and how fabrication quality and other details can affect corrosion resistance....


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Tagged categories: Carbon Steel; Corrosion protection; Galvanized steel; Randy Nixon; Stainless steel; Wastewater Plants

Comment from Mario Colica, (8/30/2018, 6:51 AM)

regarding the HDG application, I would suggest to adopt Zinc thermal spray coating: the main benefits are : thickness up to 500 um (so long lasting more than 50 years with no maintenance in the midle , at the end you may grit blast and re-spray Zinc at the place .


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