1. Instituto Tecnologico de la Laguna, Department of Chemical Engineering, ZC 27000, Torreon, Coahuila, Mexico, Department of Chemical Engineering, Lamar University, P.O. Box 10053, Beaumont, Texas 77710, Kaspar Electroplating Corporation, Shiner, Texas 77984, and Instituto Tecnológico de Saltillo, Department of Metallurgy and Materials Science, V. Carranza 2400, C.P. 25280, Saltillo, Coahuila, México