沙粒粒径和外电位对黄铜腐蚀磨损的影响  

Effect of Particle Size and Electrochemical Potential on Erosion Behavior of Brass in Liquid-Solid Solution

作　　者：王军军[1,2,3] 李志均[1] 黄伟九[1,2,3] 

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]重庆理工大学重庆市模具技术重点试验室,重庆400054 [3]重庆市制动摩擦材料协同创新中心,重庆400054

出　　处：《摩擦学学报》2016年第4期406-412,共7页Tribology

基　　金：国家自然科学基金(51171216)资助~~

摘　　要：利用自制旋转圆盘式空蚀与冲蚀联合作用试验装置,在质量分数为3.5%的Na Cl溶液中试验研究了沙粒粒径和外电位对黄铜腐蚀磨损行为的影响.结果表明:在相同质量分数下,沙粒粒径对黄铜腐蚀性能的影响较小;但黄铜冲刷腐蚀的主要失重方式受沙粒粒径和外电位影响,沙粒粒径较小时,黄铜的流失形式为磨损腐蚀,沙粒粒径较大时,流失形式随外加电位正移由磨损腐蚀转变为磨损.在黄铜冲刷腐蚀中,腐蚀磨损交互作用是引起黄铜流失的主要原因,且以腐蚀对磨损的促进作用更为显著,同时随沙粒粒径的增加及外电位正移,腐蚀磨损交互作用更加突出;基于腐蚀磨损失重率、沙粒尺寸和外电位的冲腐蚀材料流失图表明:在低电位条件下,沙粒粒径对腐蚀磨损总失重率的影响较小,在高外电位条件下,腐蚀磨损总失重率随沙粒粒径的增加急剧增加.Erosion-corrosion of brass in a liquid-solid two-phase flow（3.5% NaCl＋ Si C particle） was investigated by using a rotating disk system. Results showed that the corrosion rate of brass in the absence of erosion was independent of particle size. The main wastage form of brass was erosion-corrosion in the presence of smaller size SiC particle. Wear was the main wastage form by increasing electrochemical potential and using larger size SiC particle. Synergtic effect of erosion and corrosion were the major reasons for loss of brass, and the effect of corrosion to erosion played a more significant role. In addition, with the increase of particle size and electrochemical potential, the synergtic effect of erosion and corrosion played a more evident role in the wastage of brass. Erosion-corrosion wastage maps showed that erosion-corrosion regimes were related to particle size and electrochemical potential, low electrochemical potential resulted in low wastage no matter how large particle was, but increasing electrochemical potential increased the wastage to the medium or high level.

关 键 词：黄铜 沙粒粒径 外电位 冲蚀磨损 

分 类 号：TH117.1[机械工程—机械设计及理论]