I would think that your best bet is to start with a supplier from Europe. Since Dana is so large, you prob. The environmental and health impacts of hexavalent chromium may be serious enough that we ought to abandon the use of hexavalent chromium in conversion coatings, and accept the reduced corrosion-fighting power of trivalent chromium or other more benign materials. Whether this need actually bears out, time will only tell but thanks for opening the conversation Tmothy. What I've been looking for is a suitable replacement for zinc chromate.
Electrical conductivity is also necessary.
So for now I'm sticking to zinc with a suitabe post-treatment. Schloeter may also be a good source as they are a major Euro player. I will be working on this search for the next few weeks and will share my findings as they develop. There's an article on spray deposition as a replacement for hexavalent chrome in this month's issue of Advanced Materials and Processes. Thank you for the suggestions and discussion so far.