In-situ detection of single particle impact, erosion/corrosion and surface roughening
In-situ detection of single particle impact, erosion/corrosion and surface roughening
复制标题
DOI：
10.1016/j.wear.2020.203527
复制
发表时间：
2021-01-15
期刊：
影响因子：
5
通讯作者：
Martin, H. L.
中科院分区：
文献类型：
--
作者：
Birkin, P. R.;Lear, R.;Martin, H. L.
颗粒冲击在技术上是重要的，并且可能对表面造成重大损害。检测粒子的接近和撞击将提供有关该过程的关键信息。这一过程的高速成像提供了关于粒子速度和运动的信息，但不能回答与撞击造成的损害所引起的表面电化学性质变化有关的关键问题。此外，它很难应用于不透明的介质。为了获得这一关键信息，我们部署了一种高速电化学阻抗技术，能够确定电极的未补偿电阻、法拉第电流和有效电容。该技术的时间分辨率为1.25 μ s。流体射流中的沙粒的单独冲击（射流速度类似于4-5 m s（-1））用于引起铝界面的侵蚀/腐蚀。表面性质的变化后，个别颗粒的影响，这是之前的电化学检测的颗粒，因为它接近固/液界面。对于第一次，在原位粗糙化的电极表面的报告为一个单一的粒子的影响。电极的有效质量损失和整体表面侵蚀之间的联系，与8.5 F g（-1）的数据确定的等效粗糙化率。这项研究显示了如何以高精度和新的洞察力检测单个砂粒及其对界面造成的损害。这将提高我们对侵蚀环境的认识。
Particle impact is technologically important and can cause significant damage to a surface. Detecting the approach and impact of a particle would give key information on the process. High-speed imaging of this process gives information on a particle's velocity and movement but does not answer key questions relating to changes in electrochemical properties of a surface caused by the resultant damage on impact. Furthermore, it is difficult to apply in non-transparent media. To gain this key information, we have deployed a high-speed electrochemical impedance technique with the ability to determine the uncompensated resistance, Faradaic current and effective capacitance of an electrode. This technique has a time resolution of 1.25 lis. Individual impacts of sand particles in a fluid jet (jet velocity similar to 4-5 m s(-1)) are used to cause erosion/corrosion of an aluminium interface. Surface properties are shown to change after individual particle impacts, which is preceded by the electrochemical detection of the particle as it approached the solid/liquid interface. For the first time, the in-situ roughening of the electrode surface is reported for a single particle impact. A link between the effective mass loss of the electrode and the overall surface erosion is shown, with an equivalent roughening rate of 8.5 F g(-1) as determined from the data. This study shows how individual sand particles, and the damage they cause to an interface, can be detected with high precision and new insight. This will improve our understanding of erosive environments.