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Coarse (<=20 micron) titanium particles were deposited on low-carbon steelsubstrates by cathodic electrophoretic deposition (EPD) with ethanol assuspension medium and poly(diallyldimethylammonium chloride) (PDADMAC) aspolymeric charging agent. The preceding data demonstrated that Ti particles of~1-12 micron size, electrosterically modified by the PDADMAC charging agent,acted effectively as colloidal particles during EPD. Owing to the non-colloidalnature of the particles and the stabilization of the Ti particles byelectrosteric forces, the relevance of the zeta potential is questionable, sothe more fundamental parameter of electrophoretic mobility was used. A keyfinding from the present work is the importance of assessing theelectrophoretic mobilities of both the suspensions and solutions since thelatter, which normally is overlooked, plays a critical role in the ability tointerpret the results meaningfully. Further, algebraic uncoupling of these dataplus determination of the deposit yield as a function of charging agentaddition allow discrimination between the three main mechanistic stages of theelectrokinetics of the process, which are: (1) surface saturation; (2)compression of the diffuse layer, growth of polymer-rich layer, and/orcompetition between the mobility of Ti and PDADMAC; and (3) little or nodecrease in electrophoretic mobility of Ti, establishment of polymer-richlayer, and/or dominance of the mobility of the PDADMAC over that of Ti.

Electrophoretic mobilities of dissolved polyelectrolyte charging agent and suspended non-colloidal titanium during electrophoretic deposition