不锈钢表面转化膜润湿性能研究

Study on the Wettability of Stainless Steel Surface Conversion Film

研究了表面转化膜工艺处理前后不锈钢表面的润湿情况,并从表面形貌、粘附功以及表面化学元素及其化学状态方面分析了采用不锈钢表面转化膜技术提高材料润湿性能的机理。研究结果表明,采用表面转化膜工艺处理后,不锈钢表面的润湿性能显著提高;不锈钢表面转化膜润湿性能随处理时间的延长和处理温度的升高而升高,处理最佳工艺条件为温度75℃,时间8 min;随着在空气中放置时间的延长,不锈钢表面转化膜的润湿性能呈下降趋势,但最终达到稳定,与供货态相比,稳定后不锈钢表面转化膜的润湿性能提高了至少1倍。SEM、粘附功以及XPS分析结果显示,经表面转化膜处理后,不锈钢表面粗糙度增加,蒸馏水在材料表面的粘附功增大,材料表面Cr2O3和Cr(OH)3等含氧极性基团大幅增加,表面有机物得到一定程度的清除,这是不锈钢表面润湿性显著提高的主要原因。

The surface wettability of stainless steel treated with the surface conversion film technology was studied. Furthermore, the correlation of the improvement of stainless steels wettability with the change of surface topography, adhesion work, as well as surface chemical elements was established. The conclusion were obtained that, the surface wettability of stainless steel which was treated with surface conversion film technology increased greatly;the surface wettability improved with the increasing of treated time and temperature;the wettability is degraded with storage time, but it is tend to stability with the extending of time and is twice as much as the untreated stainless steel surface. SEM,adhesion work and XPS results indicate that,the modification of wettability are due to surface cleaning and the increase of surface roughness, adhesion work, the O polar functional groups Cr2O3 and Cr（OH）3 on the surface.