表面刻蚀粉末冶金黄铜的微观结构和防结蜡性能研究

发布时间：2018-10-26 11:13

【摘要】：目的原油运输中管道结蜡问题严重影响正常的生产运输,通过表面刻蚀的方法,获得具有超亲水性的粉末冶金黄铜表面,从而达到良好的防结蜡性能。方法结合不同刻蚀时间下的表面微观结构、粗糙特性和润湿特性,对防结蜡性能进行系统研究。采用Fe Cl3溶液,刻蚀粉末冶金黄铜试样不同时间,通过X射线衍射仪和扫描电子显微镜对刻蚀表面的成分和形貌进行分析,利用接触角测量仪测量样品表面润湿性,最后对刻蚀后的黄铜进行防结蜡测试。结果表面刻蚀过程实为"脱锌",在试样表面形成了微纳米级颗粒粗糙结构。随着刻蚀时间的延长,最大轮廓高度Rz相应增大。与未刻蚀试样相比,刻蚀后的试样表面水接触角大幅降低,防结蜡性能显著提升。当刻蚀时间为120 min时,水接触角远小于30°,粉末冶金黄铜表面达到超亲水状态,防结蜡测试后,约80%表面为干净的原始表面,几乎没有石蜡吸附。结论刻蚀表面的亲水成分和棱锥状铜单质颗粒组成的微细粗糙结构,使得其在水相中形成稳定的"水膜",这层水膜可以有效阻止油相中石蜡的析出与沉积,达到良好的防结蜡效果。
[Abstract]:Objective the problem of pipeline wax deposit in crude oil transportation seriously affects the normal production and transportation. The surface of powder metallurgical brass with super hydrophilicity is obtained by surface etching, and the good waxing resistance is achieved. Methods based on the microstructure, roughness and wettability of the surface at different etching times, the waxing resistance was studied systematically. The composition and morphology of the etched surface were analyzed by X-ray diffractometer (XRD) and scanning electron microscope (SEM) with Fe Cl3 solution, and the wettability of the sample was measured by contact angle measuring instrument. Finally, the wax-proof test of the etched brass was carried out. Results the process of surface etching was "dezincification", and the coarse structure of micro- and nanocrystalline particles was formed on the surface of the sample. With the increase of etching time, the maximum contour height (Rz) increases accordingly. Compared with the unetched specimens, the surface water contact angle of the etched samples was reduced significantly, and the waxing resistance was improved significantly. When the etching time is 120 min, the contact angle of water is much less than 30 掳, and the surface of powder metallurgy brass reaches the superhydrophilic state. After the waxing prevention test, about 80% of the surface is clean original surface, almost no paraffin adsorption. Conclusion the hydrophilic composition of the etched surface and the fine and rough structure of the pyramidal copper particles make it form a stable "water film" in the water phase, which can effectively prevent the precipitation and deposition of paraffin in the oil phase. Achieve good wax-proof effect.
【作者单位】：中国矿业大学(北京)机电与信息工程学院;北京航空航天大学材料科学与工程学院;
【基金】：国家自然科学基金青年基金项目(51304214)~~
【分类号】：TE973;TF125.211

【相似文献】