冷变形及退火温度对无铅铋黄铜耐蚀性能的影响  

Effect of cold-deformation and annealing temperature on dezincification of the unleaded Bi-containing brass

作　　者：闫静[1] 唐生渝[2] 王均[1] 何章亮[3] 赵桢[2] 沈保罗[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610064 [2]四川莱特新材料责任有限公司,四川成都610066 [3]四川大学化学工程学院,四川成都610064

出　　处：《材料热处理学报》2007年第3期85-88,共4页Transactions of Materials and Heat Treatment

摘　　要：采用脱锌腐蚀深度测量方法,光学显微镜分析和SEM等分析方法,研究了不同的冷变形量和退火温度对无铅易切削铋黄铜的耐脱锌腐蚀性能的影响.结果表明,该铋黄铜经过冷变形以后(15%～36%),由于β相沿着冷加工方向分布,同时位错密度和残余应力的增加,导致了其耐脱锌深度增加,并且冷变形程度越大,其脱锌腐蚀性能越差.退火处理可以改善冷拉铋黄铜的腐蚀性能,在250℃退火后,其具有较好的耐脱锌腐蚀性能.The effect of cold-deformation amount and annealing temperature on the dezincification of the unleaded free-cutting brass were investigated. Optical microscope, SEM and corrosion depth tests were used to investigate the corrosion characteristics of the unleaded brass. The results show that as the cold-deformation amount increases, the corrosion resistance of the cold-deformed brasses decreases due to the distribution of the β phase in the rolling direction after cold-deformation, increasing of the dislocation and residual stress. The corrosion resistance of the cold-deformed brasses can be improved through the annealing treatment. The brass annealed at 250°C exhibits the lowest values of corrosion depth.

关 键 词：无铅黄铜 脱锌腐蚀 冷变形 退火热处理 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]