Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第24卷    第5期    总第182期    2014年5月

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文章编号:1004-0609(2014)05-1285-08
镁合金表面氟化镁钠膜形成机制及其生物腐蚀性能
方信贤1,章晓波1,王 强2,巴志新1,王章忠1

(1. 南京工程学院 材料工程学院,南京211167;
2. 江苏康尚医疗器械有限公司,丹阳,212300
)

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。

 

关键字: 镁合金;NaMgF3膜;模拟体液;析氢速率;腐蚀机制

Formation mechanism and bio-corrosion properties of NaMgF3 film on surface of magnesium alloy
FANG Xin-xian1, ZHANG Xiao-bo1, WANG Qiang2, BA Zhi-xin1, WANG Zhang-zhong

1. School of Material Engineering, Nanjing Institute of Technology, Nanjing 211167, China;
2. Jiangsu Konsung Equipment Co., Ltd., Danyang 212300, China

Abstract: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 NaMgF3 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 NaMgF3 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.

 

Key words: NaMgF3 film; SBF; magnesium alloy; hydrogen evolution rate; corrosion mechanism

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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