In this work, the influence of three different surface preparation processes, namely polishing, grinding and sand-blasting on oxidation process of high purity Ni48Fe52 alloy (in at. %) at high temperature has been investigated. Surface roughness of differently treated samples was measured by contact profilometer. Isothermal oxidation was performed in thermogravimetric furnace at 900°, 950° and 1000 °C for 24 h in air. Cross-sections were prepared and then observed and analyzed by SEM (Scanning Electron Microscope) /EDS (Energy Dispersive Spectroscopy). It was determined that sand-blasting increases the number of dislocations and grain boundaries in the near-surface region and therefore slows down oxidation process by faster formation of mixed nickel/iron oxide that constitutes a barrier for outward iron diffusion. Internally oxidized zone is also more uniform and thicker for polished and ground samples in comparison to sand-blasted ones as a result of recrystallization of the latter and longer duration of faster oxygen solubility in the polished and ground samples.

在这项工作中，已经研究了三种不同的表面处理工艺，即抛光，研磨和喷砂处理对高温下高纯度Ni48Fe52合金（at。％）的氧化工艺的影响。通过接触轮廓仪测量不同处理的样品的表面粗糙度。在热重炉中在空气中于900°，950°C和1000°C下进行等温氧化24小时。制备横截面，然后通过SEM（扫描电子显微镜）/ EDS（能量分散光谱）观察和分析。已确定喷砂会增加近表面区域的位错数量和晶界，并因此通过更快地形成构成向外铁扩散的障碍的镍/铁氧化物混合而减慢氧化过程。