热处理非晶态Ni-P合金镀层的晶化过程  

Crystallization Process of Heat-treated Amorphous Ni-P Alloy Coating

作　　者：金世伟[1] 康敏[1,2] 邵越[1] 杜晓霞[1] 张欣颖[1] 

机构地区：[1]南京农业大学工学院,南京210031 [2]南京农业大学江苏省智能化农业装备重点实验室,南京210031

出　　处：《材料工程》2016年第9期115-120,共6页Journal of Materials Engineering

基　　金：2014年度苏北科技专项资金项目(BN2014019);国家大学生创新创业训练计划项目(201410307079);江苏省普通高校研究生实践创新计划项目(SJLX_0250)

摘　　要：运用电沉积的方法在45钢基体上制备Ni-P合金镀层,使用差示扫描量热法(DSC)和热重法(TG)分析非晶态NiP合金镀层在20℃/min加热速率下的热效应和质量变化。在300℃和400℃分别对镀层进行0,15,30,45,60,75min的热处理,采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计对镀层进行表征。结果表明:Ni-P合金镀层在加热过程中的放热峰出现在284.8℃处,镀层的质量和元素组成稳定;晶化过程经历了非晶态、亚稳态NiP和Ni5P2、稳定态Ni3P的转变;经过热处理后,镀层的显微硬度显著提高,最大值达1036.56HV,约为镀态的2倍;热处理态镀层的耐NaCl溶液腐蚀性能比镀态有所下降,但两者都比45钢基体好。Amorphous Ni-P alloy coatings were prepared on 45 carbon steel blocks using electrodeposition method.The thermal effect and quality change of Ni-P alloy coating under heating rate of 20℃/min were analyzed by differential scanning calorimetry（DSC）and thermogravimetry（TG）.Coatings were heat-treated at 300℃ and 400℃for 0,15,30,45,60,75 min respectively,coating surface was characterized by scanning electron microscope（SEM）,energy dispersive spectrometer（EDS）,X-ray diffraction（XRD）,microhardness tester.The result shows that the exothermic peak of Ni-P alloy coating appears at 284.8℃,coating quality and elemental composition are stable during the heat treatment.Crystallization process experiences a transformation of amorphous,metastable state NiP and Ni5P2,stable state Ni3 P.The microhardness of coating can be improved remarkably after heat treatment,namely,the maximum value of heat-treated coating is 1036.56 HV,which is nearly 2times as hard as as-deposited coating.The corrosion resistance of heat-treated Ni-P alloy coating in NaCl solution is inferior to as-deposited coating,but they are both much better than 45 carbon steel substrate.

关 键 词：NI-P合金镀层 电沉积 晶化 显微硬度 

分 类 号：TG166.7[金属学及工艺—热处理] TG174.44[金属学及工艺—金属学]