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首页> 外文期刊>Materials Science and Engineering >Electrophoretic mobilities of dissolved polyelectrolyte charging agent and suspended non-colloidal titanium during electrophoretic deposition
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Electrophoretic mobilities of dissolved polyelectrolyte charging agent and suspended non-colloidal titanium during electrophoretic deposition

机译：电泳沉积过程中溶解的聚电解质带电剂和悬浮的非胶体钛的电泳迁移率

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Coarse (≤20μm) titanium particles were deposited on low-carbon steel substrates by cathodic electrophoretic deposition (EPD) with ethanol as suspension medium and poly(diallyldimethylammonium chloride) (PDADMAC) as polymeric charging agent. Preliminary data on the electrophoretic mobilities and electrical conductivities on the suspensions of these soft particles as well as the solutions themselves as a function of PDADMAC level were used as the basis for the investigation of the EPD parameters in terms of the deposition yield as a function of five experimental parameters: (a) PDADMAC addition level, (b) solids loading, (c) deposition time, (d) applied voltage, and (e) electrode separation. These data were supported by particle sizing by laser diffraction and deposit surface morphology by scanning electron microscopy (SEM). The preceding data demonstrated that Ti particles of ~ 1 -12 μm size, electrosterically modified by the PDADMAC charging agent, acted effectively as colloidal particles during EPD. Owing to the non-colloidal nature of the particles and the stabilization of the Ti particles by electrosteric forces, the relevance of the zeta potential is questionable, so the more fundamental parameter of electrophoretic mobility was used. A key finding from the present work is the importance of assessing the electrophoretic mobilities of both the suspensions and solutions since the latter, which normally is overlooked, plays a critical role in the ability to interpret the results meaningfully. Further, algebraic uncoupling of these data plus determination of the deposit yield as a function of charging agent addition allow discrimination between the three main mechanistic stages of the electrokinetics of the process, which are: (1) surface saturation; (2) compression of the diffuse layer, growth of polymer-rich layer, and/or competition between the mobility of Ti and PDADMAC; and (3) little or no decrease in electrophoretic mobility of Ti, establishment of polymer-rich layer, and/or dominance of the mobility of the PDADMAC over that of Ti.
机译：以乙醇为悬浮介质，以聚二烯丙基二甲基氯化铵（PDADMAC）为聚合物带电剂，通过阴极电泳沉积（EPD）将粗（≤20μm）的钛颗粒沉积在低碳钢基材上。关于这些软颗粒悬浮液的电泳迁移率和电导率的初步数据，以及溶液本身作为PDADMAC水平的函数，被用作研究EPD参数的依据，依据的是沉积产率与PADMAC的关系。五个实验参数：（a）PDADMAC添加量，（b）固体负载量，（c）沉积时间，（d）施加电压和（e）电极分离。这些数据由通过激光衍射的粒度测定和通过扫描电子显微镜（SEM）的沉积表面形貌支持。先前的数据表明，由PDADMAC充电剂进行电空间改性的〜1 -12μm尺寸的Ti颗粒在EPD期间有效地充当了胶体颗粒。由于粒子的非胶体性质和Ti粒子通过静电力的稳定作用，ζ电位的相关性值得怀疑，因此使用了电泳迁移率的更基本参数。当前工作的一个关键发现是评估悬浮液和溶液的电泳迁移率的重要性，因为通常被忽略的悬浮液和溶液在有意义地解释结果的能力中起着至关重要的作用。此外，这些数据的代数解耦加上沉积物产率的确定作为充电剂添加的函数，可以区分该过程的电动动力学的三个主要机械阶段，它们是：（1）表面饱和； （2）扩散层的压缩，富聚合物层的生长和/或Ti和PDADMAC的迁移率之间的竞争； （3）Ti的电泳迁移率，富聚合物层的建立和/或PDADMAC的迁移率相对于Ti的迁移率几乎没有或没有下降。

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