Study of Corrosion Behavior of HSn62-1 in Acid, Alkali and Salt Solution

Scanning electronic microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), electro probe micro-analysis (EPMA), open-circuit potential and potentiodynamic polarization and X-ray photoelectron spectroscopy (XPS) were used to explore the corrosion mechanism and morphology of HSn62-1 brass in H₂SO₄ solution(pH=2), NaOH solution(pH=13) and NaCl solution(3.5%, mass fraction). The results indicated that there existed obvious weight loss in H₂SO₄ solution compare to NaOH solution and NaCl solution. Numerous corrosion products were detected except CuO and ZnO. The dezincification of HSn62-1 in H₂SO₄ solution can be explained as selective dissolution and its cathodic reactions were dominated by oxygen reduction and hydrogen reaction. In contrast, the dezincification mechanism was simultaneous dissolution of both zinc and copper and with the subsequent re-deposition of copper. Besides the cathodic reaction was hydrogen evolution corrosion in NaCl solution and oxygen evolution corrosion in NaOH solution.