采用中性盐雾试验、x射线衍射、扫描电镜及能谱分析等方法研究了两种新型高强耐磨铝青铜合金（代号KK1和KK3）在模拟海洋大气环境下的耐腐蚀性能和腐蚀行为。结果表明，在盐雾试验初期，两种合金的腐蚀速率都随腐蚀时间的延长而降低；168h后，腐蚀速率基本不变。在相同的中性盐雾腐蚀条件下，KK3合金的耐腐蚀性能优于KK1合金。在中性盐雾腐蚀过程中，两种铝青铜的腐蚀都表现为选择性腐蚀，此外，KK3合金发生点蚀，而KK1未发现点蚀现象。两种合金耐腐蚀性能不同的重要原因之一是KK1合金中存在大量的块状β′相。%The corrosion behaviors of two kinds of high-strength and wear-resistant novel aluminum bronzes （KK1 and KK3） were studied by neutral salt spray, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray detector. The results showed that in the initial stage the average corrosion rate of the tested materials decreased with the increase of exposure time, then kept constant after testing for 168 h. In the neutral salt spray atmosphere, KK3 alloy had better corrosion resistantce than KK1 alloy. Pitting corrosion was found on the surface of KK3 alloy, while no pitting corrosion was found on KK1 alloy. The results of SEM showed that selective corrosion occurred in both alloys. The block β′-phase in tbe KK1 alloy was one of the key points which made the difference of the corrosion resistance of the two alloys.
展开▼
