摘要
采用浸泡法在Mg-Nd-Zn-Zr镁合金表面制备氟化镁钠膜,采用点滴法、电化学法和浸泡法评定镁合金基体和氟化镁钠膜的耐蚀性,采用扫描电镜(SEM)和能谱仪(EDS)分析氟化镁钠膜试样腐蚀前后的形貌及成分。结果表明,提高转化处理温度可显著减小氟化镁钠颗粒尺寸,而转化处理时间对颗粒尺寸影响较小;氟化镁钠颗粒通过二维形核后的台阶生长机制和螺旋生长机制长大;氟化镁钠膜可显著降低Mg-Nd-Zn-Zr镁合金在模拟体液中的平均析氢速率,在模拟体液中,氟化镁钠膜逐渐转变为氟化物和磷酸盐混合膜层,新膜层继续起到保护镁合金基体的作用。
The NaMgF3 films on the surface of Mg-Nd-Zn-Zr magnesium alloy were fabricated by immersion method. Their corrosion properties were valuated by dripping test, electrochemical test and immersion method, respectively. The microstructures of the original and corrosive samples were observed by SEM and their chemical compositions were analyzed by EDS. The results show that the size of NaMgF 3 particle is obviously reduced with the increase of conversion treatment temperature; however, it is little affected by the conversion treatment time. The NaMgF3 particles grow by two-dimensional nucleation, step growth mechanism and screw growth mechanism. The average hydrogen evolution rate of Mg-Nd-Zn-Zr magnesium alloy in simulated body fluid （SBF） solution can be significantly decreased by NaMgF3 film. The NaMgF 3 films gradually transform into a new film consisting of fluoride and phosphate in the SBF solution, which will continue to protect the magnesium alloy from the corrosion.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2014年第5期1285-1292,共8页
The Chinese Journal of Nonferrous Metals
基金
南京工程学院创新基金重大项目(CKJA201202)
江苏省高校自然科学研究课题(12KJB430007)
