45钢表面Ni-Y-P合金镀层的表面形貌和性能研究  

Study on Surface Morphology and Properties of Ni-Y-P Alloy Coatings on 45 Steel

作　　者：王志华[1] 郭倩绮 朱晓翠 樊立 Wang Zhihua;Guo Qianqi;Zhu Xiaocui;Fan Li(College of Material Science and Engineering,Xi＇an University of Science and Technology,Xi＇an 710054,China)

机构地区：[1]西安科技大学材料科学与工程学院

出　　处：《煤矿机械》2018年第11期31-33,共3页Coal Mine Machinery

基　　金：陕西省教育厅项目(16JK1515);陕西省自然科学基础研究计划(2018JM5024)

摘　　要：采用化学镀工艺在45钢表面制备Ni—Y—P三元合金镀层，通过SEM、EDS、XRD、Tafel曲线等测试方法研究镀层的形貌、成分、晶相结构和耐蚀性能。采用显微硬度计测量镀层热处理前后的硬度。结果表明：Ni-Y-P镀层表面平整，为混晶结构，其中Ni、P、Y的含量分别为81．93wt％、14．35wt％和3．71wt％。在400℃-1h时效热处理过程中．Ni—Y—P合金镀层中产生Ni纳米晶化和Ni3、Ni3Y、N5Y等相沉淀析出，起到弥散强化作用，显微硬度可高达HV825。在3．5wt％NaCl溶液中,Ni—Y—P合金镀层的自腐蚀电位是-0．56V。Ternary Ni-Y-P alloy coatings were synthesized on 45 steel substrates by electroless deposition. The surface morphologies chemical composition, crystal structures and corrosion properties of Ni-Y-P alloy coatings were investigated by SEM,EDS,XRD and Tafel polarization curves. The hardness of the coatings before and after heat treatment was evaluated with a microhardness meter. The results shown that the surface of the coating is smooth and uniform. The coatings are a mixed crystal structure with the content of 81.93 wt% ,14.35 wt% and 3.71 wt%. It finds that Ni3P,Ni3Y,Ni5Y precipitation and Ni crystallization take place at 400℃-lh heat treatment. Ni3P, Ni3Y and NisY of alloy coatings play a role of dispersion strengthening, and the microhardness can reach HV825. The corrosion potential of Ni-Y-P alloy coatings in 3.5 wt% NaCI solution is -0.56 V.

关 键 词：Ni—Y—P合金镀层 化学镀 表面形貌 性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]