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首页> 中文期刊> 《中国有色金属学报（英文版）》 >铝黄铜的冲蚀和冲蚀−腐蚀:射流速度、石英砂浓度和撞击角对表面粗糙度的影响

铝黄铜的冲蚀和冲蚀−腐蚀:射流速度、石英砂浓度和撞击角对表面粗糙度的影响

         
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研究射流速度、石英砂浓度和撞击角度对冲蚀和冲蚀?腐蚀后铝黄铜表面粗糙度的影响.冲蚀和冲蚀?腐蚀实验在射流冲击机中进行.采用二维和三维轮廓曲线仪以及扫描电子显微镜表征被侵蚀样品表面.结果表明,在9、6和3 m/s射流速度下,分别增加石英砂浓度至1、5和10 g/L,冲蚀?腐蚀试样表面粗糙度增加;但是,进一步增加石英砂浓度,由于试样表面的加工硬化、反弹或覆盖效应以及高频冲击作用,试样表面粗糙度降低.随着射流速度的增加,试样表面粗糙度增加.研究结果还表明,当射流速度为3和6 m/s时,试样表面粗糙度随撞击角度的变化并不明显;而在较高的射流速度9 m/s时,倾斜撞击造成腐蚀表面形成波痕,因此,具有比正面撞击试样更高的表面粗糙度.%Effects of jet velocity, sand concentration and impingement angle on the surface roughness of Al-brass alloy were investigated after erosion and erosion?corrosion tests. The tests were performed using a jet impingement rig. The eroded surfaces were characterized using 2-D and 3-D surface profilometery and scanning electron microscopy (SEM). The results showed that there was an increase in the surface roughness of the erosion?corrosion samples as sand concentration was increased to 1, 5 and 10 g/L at jet velocities of 9, 6 and 3 m/s, respectively. However, the surface roughness decreased with a further increase in sand concentration. This decrease in the surface roughness was attributed to the higher work hardening of the surface, rebounding or blanketing effect and very high frequency of the impacts at the higher sand concentrations. The surface roughness increased as the jet velocity increased. The results also showed that the change in the surface roughness with impingement angle was not significant at two jet velocities of 3 and 6 m/s. However, at a higher jet velocity of 9 m/s, formation of ripples on the erosion surfaces at oblique angles resulted in a higher surface roughness as compared with the normal impingement angle.

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