Influence of the Flowing Conditions on the Galvanic Corrosion of the Copper/AISI 304 Pair in Lithium Bromide Using a Zero-Resistance Ammeter

摘要

In this work, the influence of Reynolds number (Re) on the galvanic corrosion of the copper/AISI 304stainless steel pair in an 850 g/L lithium bromide solution was evaluated in a hydraulic circuit using azero-resistance ammeter; this technique has the advantages that it can be used without disturbing thesystem under investigation and in continuous-time. Results show that copper is the anodic member ofthe pair for all the Re analyzed. The galvanic current density values are always greater under flowingthan under stagnant conditions. A general tendency of galvanic current density to decrease with time isobserved due to the formation of a film of corrosion products on copper surface. Under flowingconditions, initially, galvanic current density increases with Re; however, with time, this tendency isreversed. As Re increases, greater quantities of corrosion products are initially produced and, as aresult, a thicker film is formed.