Ti含量对耐蚀铜合金冲蚀性能的影响

Effect of Ti content on erosion properties of corrosion-resistant copper alloy

采用MCF-30型冲蚀磨损试验机,对不同钛含量的耐蚀铜合金在含砂的人工海水中进行冲蚀试验。冲蚀试验前后利用电子分析天平对冲蚀试样称重,利用扫描电镜和透射电镜分析冲蚀试样的冲蚀形貌、微观组织和冲蚀机理,在320HBS-3000型数显布氏硬度计上测量合金硬度。结果表明：添加Ti能显著提高合金在人工海水砂浆冲蚀条件下的冲蚀抗力,其冲蚀机理为砂粒的微切削与人工海水腐蚀综合作用机制;当钛含量为2.0%时,合金的耐冲蚀性能最好;在冲蚀速度为8.79 m·s^-1,冲蚀角度为90°时,未加入Ti的合金表面腐蚀特征明显,出现了短的微切削沟槽、砂粒冲击坑及较粗大颗粒硬质相剥落坑;加入0.5%Ti的合金的冲蚀表面出现了较多的犁耕状沟槽和鱼鳞状剥落坑;加入2.0%Ti的合金的冲蚀表面腐蚀明显减轻,冲蚀表面沟槽较浅且比较窄。

Erosion test of corrosion resistant copper alloy with different contents of titanium in artificial sea water containing sand was carried out by MCF-30 type erosion test machine. The mass of the eroded samples before and after the erosion test was measured by electronic analytical balance. The erosion morphology,microstructure and erosion mechanism of the eroded samples were analyzed by means of scanning electron microscopy and transmission electron microscopy. The hardness of the alloys was measured on 320 HBS-3000 digital display Brinell hardness meter. The results show that the addition of Ti can significantly improve the erosion resistance of the alloys in the artificial seawater,and its erosion mechanism is the combination of micro-cutting of sand particles and artificial seawater corrosion.When the content of titanium is 2. 0%,the alloy has the optimum corrosion resistance. When the erosion velocity is 8. 79 m·s^-1 and the erosion angle is 90°,the corrosion characteristics of the alloy without Ti are obvious,and the short micro-cutting grooves,sand impact pits and coarse grain hard phase particles spalling pits appear on the erosion surface of the alloy. There are more ploughing grooves and fish scale peeling pits on the erosion surface of the alloy with the addition of 0. 5% Ti. The surface corrosion of the alloy with 2. 0% Ti added is obviously reduced,and the erosion surface groove is shallow and narrow.