Electrophoretic deposition of boehmite coatings on titanium from aqueous sols

The electrophoretic deposition from sots and colloidal suspensions of ceramic powders has many advantages over conventional ceramic powder processing methods. In this way it is possible to control the thickness and microstructure of the sintered layers. The deposition of homogeneous boehmite (AlOOH) layers of controlled thickness on titanium was investigated. The deposition process from aqueous boehmite sots took place at different constant voltage values and deposition times. It is shown that applied voltage and deposition time affect the morphology and the mass of the boehmite deposit. It is also shown that at increased applied voltage the boehmite film of more porous structure was formed (detected by SEM), due to increased amount of evolved hydrogen.