Abstract
Abstract The use of brackish water in open cooling-systems circuits is becoming increasingly imperative because fresh water is in limited supply. In view of recurring failures with different copper alloys in this water due to microbial corrosion, studies have been carried out in this medium with different materials—super stainless steel (SS): AL-6XN (UNS N08367) and Duplex 2507 (UNS S32750); Grade 2 Titanium (UNS R50400) and Cu-10Ni (UNS C70600)—from both an inorganic and microbiological standpoint. This paper presents the evaluation of these alloys in a dynamic on-line monitoring system with one-way circulation using brackish water with and without chlorine treatment for 3-, 8-, and 12-month exposure periods. Before chlorination, the microbiological water analysis indicated microbial development with planktonic sulfate-reducing bacteria (SRB) on the order of 107 cell/mL and after chlorination, 10 cell/mL. Pre- and post-chlorination scanning electron microscopy (SEM) and energy-dispersive x-ray (EDS) anal...
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