Response Characteristics of the Potential-Controlled Friction of ZrO2/Stainless Steel Tribopairs in Sodium Dodecyl Sulfate Aqueous Solutions
Response Characteristics of the Potential-Controlled Friction of ZrO2/Stainless Steel Tribopairs in Sodium Dodecyl Sulfate Aqueous Solutions
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ZrO2/不锈钢摩擦副在十二烷基硫酸钠水溶液中电位控制摩擦响应特性
DOI：
10.1007/s11249-010-9587-3
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发表时间：
2010-05-01
影响因子：
3.2
通讯作者：
Zuo, Yinghong
中科院分区：
文献类型：
--
作者：
He, Siqing;Meng, Yonggang;Zuo, Yinghong
本文研究了ZrO 2/不锈钢滑动接触在十二烷基硫酸钠（SDS）水溶液中的电位控制摩擦响应特性。首先介绍了两种分别利用电化学工作站和信号发生器来改变球-盘接触界面电位的方法。然后在稳态和动态电位条件下的摩擦试验报告。从稳态电位实验结果中发现，摩擦系数随电位呈准线性变化的电位范围在体系的电化学窗口内，且不析氢析氧。当通过使用电化学站或信号发生器在电位范围内以三角波或正弦波的形式调制界面电位时，摩擦系数在较低和较高水平之间以相同的形式变化，只要所施加的电位的频率低于断裂频率。当界面电位突然从开路电位下降到负值时，观察到摩擦系数从约0.1的较低水平增加到约0.45的较高水平的响应时间在0.2和1.5 s之间，这取决于电位的大小和SDS浓度。当界面电位突然升高到0 V或一个小正值时，摩擦系数可在0.5 ~ 2s的短时间内（取决于SDS的浓度）从较高水平恢复到较低水平，这比切断电压时的摩擦恢复时间要短得多。最后还讨论了固溶温度对摩擦响应时间的影响。
In this article experimental results have been presented on response characteristics of the potential-controlled friction of ZrO2/stainless steel sliding contacts in sodium dodecyl sulfate (SDS) aqueous solutions. Two methods for modifying interfacial potential, by using an electrochemistry station and a signal generator, respectively, of the ball-on-disk contacts, are described firstly. Then friction tests under steady and dynamic potential conditions are reported. From the steady potential experiment result, a potential range in which friction coefficient varies with potential quasi-linearly has been found. The potential range is within the electrochemical window of the system, and neither hydrogen nor oxygen evolution happens. When interfacial potential is modulated within the potential range in the form of a triangular or a sinusoidal wave, by using either an electrochemistry station or a signal generator, friction coefficient varies in the same form between lower and higher levels, as long as the frequency of the applied potentials is lower than a break frequency. When the interfacial potential is changed abruptly from the open circuit potential down to a negative value, a response time ranging between 0.2 and 1.5 s, depending on the magnitude of the potential and the SDS concentration, is observed for friction coefficient to increase from the lower level of about 0.1 to the higher level of about 0.45. When the interfacial potential is elevated suddenly to 0 V by shorting or to a small positive value, friction coefficient can recover from the higher level to the lower level within a short time, 0.5–2 s, depending on the SDS concentration, which is much shorter than the recovery time of friction in the case of just switching-off the voltage. At last, effect of solution temperature on the response time of friction to stepwise changes in potential is also presented.