DEZINCIFICATION CORROSION BEHAVIOR AND ITS INHIBITING MECHANISM OF BRASS EXPOSED TO SEAWATER
实海暴露黄铜脱锌腐蚀行为及抑制脱锌机理研究

In present paper, characteristic and mechanism of corrosion of brass exposed to seawater for several years, including alloys with single phase and afp double phase, have been investigated by means of metallograph, SEM, EDXA and so on. It was shown that se- vere corrosion with intergranular and dezincification characteristic occurred for the specimens of HSSAr which was single a-phase brass with As addition. For the brass of HSn70-1A, which was single-phase alloy with As and Sn additions, could exhibit much better corrosion resis- tance with Sn-rich corrosion product film. Sn element was much easier to enrich at grain boundaries. This would inhibit dezincification of the afp double phase brass to some extent. However, it was not enough for the Sn element addition in the brass HSn6*-1 with a+P double phase to resist dezincification corrosion getting through phase and grain boundaries of the brass. It was observed that diffusion of alloying elements at boundaries played an important role on the corrosion behavior of both a-phase and afp double-phase brass.