摘要
为了提高漆层与铝合金基体之间的结合力,往往需要进行毛化预处理。激光微织构加工技术具有环保、高效、毛化表面均匀可控等优点,而连续激光器输出的激光更加稳定、速度更快,研究连续激光微织构对漆层结合力的影响很有必要。通过控制激光功率、搭接率两个主要参量进行激光微织构加工,用激光共聚焦显微镜对微织构三维形貌进行观察并表征,用表面轮廓综合测量仪对表面粗糙度Ra、轮廓高度Rz进行测量,使用摩擦磨损试验机采用划痕法对涂层结合力进行测试,最终建立起微织构形貌、表面粗糙度和涂层结合力之间的联系。结果表明:激光功率对微织构形貌尺寸的影响比较明显;火山口和冠状形貌交错分布的微织构形貌有效地提高了漆层结合力;搭接率在0%~20%时结合力较高,平均可达36.41 N,提高54%左右;在划痕试验中,轮廓高度Rz与漆层结合力关系密切;特殊的起伏结构有效抑制了漆层大面积剥离过程。
In order to improve the binding force between the paint layer and the aluminum alloy matrix,it is often necessary to carry out hairization pretreatment.Laser microwoven processing technology has the advantages of environmental protection,high efficiency,uniform and controllable hairing surface,etc.,while the laser output of the continuous laser is more stable and faster.Therefore,it is necessary to study the influence of continuous laser microwoven on the adhesion of the paint layer.By controlling the laser power,the two main parameters of the lap rate are laser microwoven processing.The three-dimensional morphology of microwoven structure was observed and characterized by laser confocal microscopy,the surface roughness R_a and contour height R_z were measured by the surface contour comprehensive measuring instrument,the abrasion and wear testing machine was used to test the coating adhesion force by scratch method,and the connection between the microwoven morphology,surface roughness and coating adhesion force was finally established.The results show that the influence of laser power on the morphological size of the microwoven fabric is obvious,the microwoven morphology of the crater and the coronal morphology which is staggered and distributed effectively improves the adhesion of the paint layer,the adhesion force is higher at 0%~20%,the average can reach 36.41 N,which is about 54%.In the scratch experiment,the contour height R_z is closely related to the adhesion force of the paint layer;and the special undulating structure effectively inhibits the large-area peeling process of the paint layer.
作者
姜代旬
王新
孙禹
何晓龙
苏申立
Jiang Daixun;Wang Xin;Sun Yu;He Xiaolong;Su Shenli(CRRC Qingdao Sifang Locomotive&Rolling Stock Co.,Ltd.,Qingdao 266000,Shandong,China;School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)
出处
《应用激光》
CSCD
北大核心
2023年第6期94-101,共8页
Applied Laser
关键词
激光技术
连续激光
微织构加工
结合力
lasertechnology
continuous laser
microwoven processing
binding force
