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Corrosion Resistance and Dezincing of Brasses |
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30.09.2008 г. |
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Corrosion Resistance and Dezincing of Brasses I. K. Marshakov Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia e-mail:
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Received March 23, 2004 Abstract — The corrosion behavior of brasses in aerated electrolyte solutions (where dezincing is frequently observed) is studied. In this case, a layer of fine-grained copper forms on the brass surface. Ignoring this copper as the corrosion product, that is, calculating corrosion loss by the sample weight loss, one underestimates actual corrosion rate by 1.5–2 times. However, in closed systems, in the absence of dezincing, oxidized copper accumulates in solution and acts as a catalyst of cathodic process increasing significantly the corrosion rate. The following methods of reducing the corrosion rate and brass dezincing are considered: deoxygenation of medium, the use of zinc anodes, and the alloying of brasses with the third component. The conditions, under which these methods are the most efficient, are determined.
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