摘要
本文选择在600℃均匀化退火,通过控制保温时间,研究其对复合材料界面反应的影响。采用XRD、SEM及EDS观察复合材料界面结构及成分的变化,利用普林斯顿2273三电极电化学工作站极化曲线及电化学交流阻抗揭示保温时间对SiC_p/Al复合材料耐蚀性差异。结果表明:经不同均匀化退火时间的SiC_p/Al复合材料,SiC颗粒与基体结合较好无孔洞,同时有界面反应相Si、MgAl_4O_2、Al_4C_3生成,随着保温时间的延长白亮相不断增多,白亮相即Si。SiC_p/Al复合材料在不同退火保温时间下腐蚀过程均是由活化控制的,其腐蚀电位变化很小。随着保温时间的延长,腐蚀速率先减小后增大,在3 h时腐蚀速率最小,即腐蚀电流最小值5.3E-6 A/cm^2,电化学阻抗值先增大后减小,在3 h时阻抗值最大值3.42E4Ω·cm^2。
The effects of different annealing time on interfacial reaction of the composite were investigated at 600 ℃. SiC_p/ Al composite interface was studied by means of metallurgical microscope,SEM,EDS and XRD. Corrosion of SiC_p/ Al composite was studied by means of polarization cure. Experimental results show that: By different homogenizing annealing time of SiC_p/ Al composite materials,combined with Si C particles and matrix were better without holes,at the same time Si,MgAl_4O_2 and Al_4C_3were produced,as the extension of heat preservation time growing white appearances,white appearances were Si. The corrosion process of SiC_p/ Al composite under different annealing was controlled by actibation. With increasing heat treatment time,corrosion potential was constant,corrosion rate of SiC_p/ Al composite was first decreasing and then increasing,At the time of 3 h corrosion rate was minimum,and corrosion current was minimum value5. 3E-6 A / cm^2,resistance value of EIS was first increasing and then decreasing,At the time of 3h it was maximum value 3. 41E4 Ω·cm^2.
出处
《南昌航空大学学报（自然科学版）》
CAS
2016年第4期26-31,共6页
Journal of Nanchang Hangkong University(Natural Sciences)
基金
国家自然科学基金(51262023)
关键词
Si
Cp/Al复合材料
均匀化退火
界面
腐蚀性能
SiC_p/ Al composite materials
homogebuzing annealing
interface
corrosion property
