风沙环境下钢结构涂层的冲蚀摩擦学性能  

Erosion Tribological Performance of Steel-structure Coating in Sandstorm

作　　者：郝贠洪[1] 冯玉江[1] 段国龙[1] 任莹[1] 

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051

出　　处：《北京工业大学学报》2015年第4期558-565,共8页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(11162011);内蒙古自然科学基金资助项目(2009 MS0706)

摘　　要：针对内蒙古中西部地区钢结构体系表面涂层长期遭受风沙环境冲蚀的这一现状,采用气流挟沙喷射法,模拟风沙对钢结构涂层的冲蚀.研究了风沙冲蚀力学参数对钢结构涂层冲蚀率的影响;探讨了涂层冲蚀损伤的摩擦学机理;分析了钢结构涂层的冲击摩擦因数变化规律.结果表明：涂层的冲蚀率均随着冲蚀速度呈指数增长,速度指数n为2：39-2：43;在45°时涂层的冲蚀率最大,90°时涂层的冲蚀率最小,低冲角时的冲蚀率大于高冲角时;涂层的摩擦因数处于0：37-0：42,涂层磨损的Taber指数为81：9×10^-3mg/r,涂层的耐磨性较差.涂层损伤的摩擦学机理是：低冲角时的微切削作用或高冲角时的挤压凿削作用造成涂层的损伤占主导,涂层表面微裂纹扩展交叉,以致断裂剥落,造成的损伤次之;涂层冲击摩擦因数离散性较大,且随角度增长呈降低趋势;冲击摩擦因数与冲蚀率随角度的变化并不一致.In view of the present steel-structure coating surface has long been eroded by sandstorm in the central and western region of Inner Mongolia,the sand flow injection test method was used to simulate sandstorm erosion wear on the steel-structure coating. The influence of sandstorm erosion mechanic parameters of erosion rate was studied. The erosion tribological mechanism of steel-structure coating was discussed. The variation law of the steel-structure coating＇s impact friction coefficient was analyzed.Results show that the erosion rate of the coating rises exponentially with the erosion speed,and the growth index n is about 2. 39- 2. 43; the erosion rate is up to maximum when the erosion-angle is 45°,and the erosion rate is up to minimum when the erosion-angle is 90°,and the erosion rate at low erosion angle is greater than that at high erosion angle. The friction coefficient of coating is about 0. 37- 0. 42,and the coating＇s wear Taber index is 81. 9 × 10^- 3mg / r,so the wear resistance of the coating is poor. The tribological damage mechanism of coating is that the dominant damage comes from the micro cutting effect at angle. Impact friction coefficient and erosion rate along with the change of the erosion angle is not consistent. Low erosion angle or squeezing the chisel cut effect at high erosion angle causes the primary damage to the coating,and the secondary damage to the coating comes from the expanding micro cracks of the coating surface which causes cracking and peeling. The impact friction coefficient of the coating shows large discreteness,and it decreases with increasing.

关 键 词：风沙 冲蚀磨损 钢结构涂层 冲蚀率 冲击摩擦因数 

分 类 号：TQ633.1[化学工程—精细化工]