The microstructure of Cu-11 wt percent Sn bronze has a marked effect on the distribution of corrosion. Heterogeneous bronze exhibited a greater degree of selective attack in seawater than what occurred on homogeneous alloys. Microprobe analysis and x-ray photoelectron spectroscopy studies showed that copper-rich areas dissolved preferentially in aerated seawater: Polarization work showed that benzotrinzole is a good anodic inhibitor for bronze immersed in seawater and sodium chloride (NaCl) solution. The addition of 1 g/L benzotrinzole to seawater significantly increased the time for the onset of visible corrosion on immersed bronze, while predipping had little effect. In aerated seawater containing benzotrinzole, the copper was preferentially attacked; however; under wet mud in seawater; the tin showed slightly more dissolution.
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