Dynamic corrosion properties of impact-fretting wear in high-temperature pure water
Dynamic corrosion properties of impact-fretting wear in high-temperature pure water
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DOI：
10.1016/j.wear.2014.11.029
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发表时间：
2015-05-01
期刊：
影响因子：
5
通讯作者：
Yashiro, H.
中科院分区：
文献类型：
--
作者：
Sato, Y.;Iwabuchi, A.;Yashiro, H.
动态腐蚀被定义为在机械作用下发生的腐蚀，例如滑动摩擦，其暴露新鲜表面并加速磨损。为了评价奥氏体不锈钢在纯水中的腐蚀磨损性能，对304不锈钢盘与Al2O3球进行了冲击微动磨损试验，并进行了极化试验。使用扫描电子显微镜（SEM）、电子探针显微分析仪（EPMA）、原子力显微镜（AFM）和三维（3D）轮廓仪对磨痕进行观察、分析和测量。当温度低于100 ℃时，随着水温和氧化时间的增加，圆盘的最大磨损深度增加。然而，由于304型防爆片的磨痕上粘附着完整的氧化层，因此在130 ℃时最大磨损深度减小。提出了冲击微动磨损模型，表明动态腐蚀符合金属氧化抛物线规律和热活化过程。为了明确动态腐蚀过程，采用电位脉冲法（PPM），从不同水温下电流密度的变化得到了Na2SO4溶液中的活化能。活化能与纯水中冲击微动磨损试验所得活化能基本相同。其结果是，从新鲜的表面的氧化物去除效率小于10%，和新鲜的表面在纯水中的腐蚀是由电化学溶解根据微电池的形成。(C)2014爱思唯尔有限公司版权所有。
Dynamic corrosion is defined as the corrosion that occurs under mechanical actions such as sliding friction, which exposes fresh surfaces and accelerates wear. To estimate the corrosive wear properties of austenitic stainless steel in pure water, impact-fretting wear tests of Type 304 stainless steel disks against Al2O3 balls were performed, and polarization tests were carried out. A scanning electron microscope (SEM), electron-probe micro-analyzer (EPMA), atomic force microscope (AFM), and three-dimensional (3D)-profilometer were used for observation, analysis, and measurement of wear scars. The maximum wear depth of the disk increased with an increase in both water temperature and oxidation time for temperatures below 100 degrees C. However, the maximum wear depth decreased at 130 degrees C due to the intact oxide layer adhered to the wear scar of the Type 304 disk. We proposed a wear model for impact-fretting, which showed that dynamic corrosion agreed with the parabolic law of oxidation of metals and the thermal activation process. To specify the process of dynamic corrosion, the activation energy was obtained from the change in the electric current density at different water temperatures using the potential pulse method (PPM) in Na2SO4 solution. The activation energy was approximately the same as that obtained by impact-fretting wear tests in pure water. As a result, the oxide removal efficiency from the fresh surface was less than 10%, and the corrosion of the fresh surface in pure water was caused by electrochemical dissolution according to the micro-cell formation. (C) 2014 Elsevier B.V. All rights reserved.