The Characteristic and mechanism of corrosion of brass exposed to seawater for several years, including alloys with single alpha-phase and alpha + beta phase, were investigated by means of metallograph, SEM, EDS and s...The Characteristic and mechanism of corrosion of brass exposed to seawater for several years, including alloys with single alpha-phase and alpha + beta phase, were investigated by means of metallograph, SEM, EDS and so on. It shows that severe corrosion with intergranular and dezincification characteristics occurred on the specimens of H-68A, which was single alpha-phase brass with As element addition. For the brass of HSn70-1A, which was single-phase alloy with ils and Sn additions, much better corrosion resistance could be exhibited due to the formation of Sn enrichment corrosion product film. Sn element is much easier to enrich at phase and grain boundaries than towards surface film. This would inhibit dezincification of the alpha + beta phase brass to some extent. However, it is not enough for the Sn element addition in the brass HSn62-1 with alpha + beta phase to resist dezincification corrosion getting through phase and grain boundaries of the brass. The alleging elements boundary diffusion plays an important role in the corrosion behavior of both alpha-phase and alpha + beta phase brass.展开更多
文摘The Characteristic and mechanism of corrosion of brass exposed to seawater for several years, including alloys with single alpha-phase and alpha + beta phase, were investigated by means of metallograph, SEM, EDS and so on. It shows that severe corrosion with intergranular and dezincification characteristics occurred on the specimens of H-68A, which was single alpha-phase brass with As element addition. For the brass of HSn70-1A, which was single-phase alloy with ils and Sn additions, much better corrosion resistance could be exhibited due to the formation of Sn enrichment corrosion product film. Sn element is much easier to enrich at phase and grain boundaries than towards surface film. This would inhibit dezincification of the alpha + beta phase brass to some extent. However, it is not enough for the Sn element addition in the brass HSn62-1 with alpha + beta phase to resist dezincification corrosion getting through phase and grain boundaries of the brass. The alleging elements boundary diffusion plays an important role in the corrosion behavior of both alpha-phase and alpha + beta phase brass.
