含铈铝黄铜的显微组织与性能

Microstructure and properties of aluminum brass with Ce

采用金相组织分析、显微硬度分析、质量损失分析、电化学测试和扫描电镜等手段研究铈铝黄铜和砷铝黄铜的加工性能、组织结构和耐蚀性能。结果表明:铈铝黄铜最佳热轧温度为700～750℃,该合金表现出良好的冷加工性能,退火组织细小均匀,700℃退火1 h后再结晶晶粒大小为50μm左右。在NaCl(3.5%)溶液中腐蚀过程中,铈铝黄铜表面形成一层较均匀致密腐蚀产物膜,较好地阻止了Zn从基体表面向介质中扩散,在一定程度上抑制了脱锌;铈铝黄铜耐腐蚀性能略优于砷铝黄铜,腐蚀速率为6.2×10?3 mm/a。

The processing abilities, structures and corrosion properties of the ceric aluminum brass and the arsenical aluminum brass were studied by means of metallographic analysis, microhardness measurement, mass loss measurement, electrochemical testing and scanning electron microscopy. The results show that the suitable hot-rolling temperature of the alloy with Ce is between 700 and 750℃; it has excellent cold-working capability, and the annealed structure is fine and homogeneous after annealing at 700 ℃ for 1 h; the recrystallization grains are about 50 txm. In the process of corrosion in 3.5% NaCl solution, the ceric aluminum brass forms a homogeneous and tight corrosion film on the surface, which can inhibit the diffusion of Zn from the surface of matrix to the solution, and restrain the dezincification to a certain degree. The corrosion resistance of the ceric aluminum brass is slightly better than that of the arsenical aluminum brass, the corrosion rate is 6.2×10^-3mm/a.