Investigation of the Surface Potential on Iron Nanoparticles During the Corrosion by Atomic Force Microscopy (AFM) and Kelvin Probe Force Microscopy (KFM)

X. Joseph Raj; T. Nishimura

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Investigation of the Surface Potential on Iron Nanoparticles During the Corrosion by Atomic Force Microscopy (AFM) and Kelvin Probe Force Microscopy (KFM)

机译：原子力显微镜（AFM）和kelvin探针显微镜（KFM）在腐蚀过程中对铁纳米粒子的表面电位研究（KFM）

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The combination of atomic force microscopy (AFM) and Kelvin probe force microscopy (KFM) was apowerful technique to obtain high-resolution maps of the surface potential distribution on the pure iron(Fe) and Stainless steel (SUS:18Cr-8Ni-Fe) nanoparticles. The corrosion behavior of the individualnanoparticle was monitored in 0.1M H2SO4 solution with different time. The size and the surfacepotential of the pure Fe nanoparticles decreased with time in an acid solution, indicating the corrosionof nanoparticles. Similarly, the surface potential of the nanoparticles by KFM decreased with increasein the concentration of the acid. The changes in KFM maps of nanoparticles showed the corrosioncorresponded to the anodic reaction by surface potential. The corrosion at pure-Fe surface occurredmore severely than that of SUS nanoparticle. Moreover, the decrease of the surface potential of Fenanoparticle was sharper than SUS nanoparticle. This was due to the keeping of passive film of SUSnanoparticle in severe solution. Therefore, the corrosion of SUS nanoparticle was suppressed by theformation of protective film on the surface. It was concluded that SUS nanoparticle exhibited excellentcorrosion resistance compared to Fe nanoparticle in a 0.1M H2SO4 solution.

机译：原子力显微镜（AFM）和keelvin探针力显微镜（KFM）的组合是纯铁（Fe）和不锈钢表面电位分布的高分辨率图（SUS：18Cr-8Ni-Fe）。纳米粒子。用不同的时间在0.1M H 2 SO 4溶液中监测个体癌的腐蚀行为。纯Fe纳米颗粒的尺寸和表面瓣膜呈酸性溶液中的时间减少，表明纳米颗粒的腐蚀。类似地，纳米颗粒的表面电位随着酸的浓度降低了酸的浓度。纳米颗粒的KFM地图的变化显示通过表面电位对对应的阳极反应进行腐蚀。纯Fe表面的腐蚀发生比SUS纳米粒子的腐蚀越来越多。此外，蕨类植物的表面电位的降低比SUS纳米粒子锐利。这是由于在严重的溶液中保持苏纳序的被动膜。因此，通过表面上的保护膜的形式抑制了SUS纳米粒子的腐蚀。结论是，与0.1M H 2 SO 4溶液中的Fe纳米粒子相比，SUS纳米粒子表现出优异的腐蚀性。

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《International Journal of Electrochemical Science》 |2014年第4期|共11页
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X. Joseph Raj; T. Nishimura;
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Investigation of the Surface Potential on Iron Nanoparticles During the Corrosion by Atomic Force Microscopy (AFM) and Kelvin Probe Force Microscopy (KFM)

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