助镀剂对化学镀Ni-P-Al2O3表面性能的影响  

Effects of Fluxing Agent on Surface Properties of Electroless Ni-P-Al2O3

作　　者：蔡旭林 孟为国[1] 肖茂华[1] 杨和梅[1] 刘冠男 CAI Xulin;MENG Weiguo;XIAO Maohua;YANG Hemei;LIU Guannan(College of Engineering, Nanjing Agricultural University, Nanjing 210031, China)

机构地区：[1]南京农业大学工学院，江苏 南京 210031

出　　处：《热加工工艺》2019年第12期84-87,92,共5页Hot Working Technology

基　　金：中央高校基本科研业务费资助项目(KYZ201657);南京农业大学SRT项目(1630B44)

摘　　要：采用化学复合镀技术在45钢表面制备Ni-P-Al2O3镀层。通过控制变量法,研究了基体粗糙度、助镀剂种类、氧化铝粒度及热处理对镀层性能的影响。结果表明,在四个粗糙度区间0.03~0.06、0.08~0.127、0.149~0.199、0.2~0.25内,0.03~0.06与0.2~0.25μm区间内,即粗糙度较大或较小时,镀层的硬度、耐磨性较好,硬度最高达523.67 HV,磨损量最低至0.0001 mm3;在相同粗糙度下,草酸与柠檬酸混合溶液作为助镀剂时,镀层的硬度与耐磨性最好;添加Al2O3微粒可有效强化镀层的硬度和耐磨性,硬度最高可达609.81 HV;Al2O3粒子越小,镀层耐磨性越好;在一定范围内,粒子越小,镀层硬度越高,但粒度过小,将削弱硬度;400℃低温热处理后,可使镀层的硬度与耐磨性有突破性的增加,硬度最高可达832.47 HV。The electroless composite plating was applied to prepare Ni-P-Al2O3 coat on the surface of 45 steel.By variable-controlling approach,the influences of matrix roughness,category of plating auxiliary,grain size of aluminum oxide and heat treatment on the plating performance were investigated.The results indicate that within the four ranges of roughness(0.03-0.06,0.08-0.127,0.149-0.199 and 0.2-0.25μm),in the 0.03-0.06 and 0.2-0.25μm,when the roughness is larger or smaller,the plating has better hardness(maximum hardness:523.67 HV)and abrasion resistance(minimum abrasion loss:0.0001mm3);when the roughness is the same and the mixed solution of oxalic acid and citric acid are used as plating auxiliary,the plating has the best hardness and abrasion resistance;adding Al2O3 particles can effectively enhance the hardness and abrasion resistance of the plating,and the maximum hardness is up to 609.81HV;the smaller the size of Al2O3 particles,the better the abrasion resistance of the plating.Within certain limits,the smaller the particles are,the higher the hardness is.However,when the particles are too small,the hardness reduces;following heat treatment at low temperature(400℃),the hardness and abrasion resistance of the plating can increase substantially,and the maximum hardness can reach 832.47 HV.

关 键 词：化学复合镀 Al2O3粒子 硬度 耐磨性 

分 类 号：TG174.445[金属学及工艺—金属表面处理]