Brass alloy and preparation method thereof

The invention discloses a brass alloy, which is characterized in that the brass alloy comprises the following components in percentage by mass: 59 to 63 weight percent of Cu, 0.2 to 0.8 weight percent of Si, 0.4 to 1.0 weight percent of Sn, 0.05 to 0.15 weight percent of Pb, 0.1 to 0.2 weight percent of Al, 0.02 to 0.15 weight percent of As and the balance of Zn and inevitable impurities. According to the alloy disclosed by the invention, 10-25% of beta phase is obtained by controlling the proportion of Cu and Si elements and adding Sn and As elements while the alloy meets the environmental protection requirement, so that the dezincification corrosion resistance test standard of less than 100 microns can be achieved, the failure of products in the valve and bathroom industry caused by dezincification is greatly reduced, and meanwhile, the problem that conventional dezincification-resistant alpha single-phase brass is difficult to process by hot forging is solved. 本发明公开了一种黄铜合金，其特征在于，该黄铜合金的质量百分比组成为Cu：59～63wt％、S