首页|Quasi-in-situ Observation and SKPFM Studies on Phosphate Protective Film and Surface Micro-Galvanic Corrosion in Biological Mg-3Zn-xNd Alloys
Quasi-in-situ Observation and SKPFM Studies on Phosphate Protective Film and Surface Micro-Galvanic Corrosion in Biological Mg-3Zn-xNd Alloys
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The phosphate protective film and micro-galvanic corrosion of biological Mg-3Zn-xNd(x=0,0.6,1.2)alloys were investi-gated by scanning and transmission electron microscopy,quasi-in-situ observation,scanning Kelvin probe force microscopy(SKPFM)and electrochemical tests.The results revealed the Mg-Zn-Nd phases formed in Mg-3Zn alloy contained with Nd.Adding Nd resulted in a significant decline in the cracks of the phosphate protective film and micro-galvanic corrosion of alloys,which were recorded by quasi-in-situ observation.In addition,the Volta potential difference of Mg-Zn-Nd/α-Mg(～188 mV)was lower than MgZn/α-Mg(～419 mV)and Zn-rich/α-Mg(～260 mV),and the corrosion rates of alloys mark-edly decreased after the addition of 0.6 wt％Nd.The improvement in corrosion resistance of Nd-containing alloys was mainly attributed to the following:(ⅰ)the addition of Nd reduced the Volta potential difference(second phases/α-Mg);(ⅱ)the phosphate protective film containing Nd2O3 deposited on the surface of the alloys,effectively preventing the penetration of harmful anions.
Magnesium alloysQuasi-in-situ observationPhosphate protective filmScanning Kelvin probe force microscopy(SKPFM)Micro-galvanic corrosion
Zhaochen Yu、Kaixuan Feng、Shuyun Deng、Yang Chen、Hong Yan、Honggun Song、Chao Luo、Zhi Hu
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School of Advanced Manufacturing,Nanchang University,Nanchang 330031,China
Institute for Advanced Study,Nanchang University,Nanchang 330031,China
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