Consequences of using reagent preserved with sodium azide on gold film
http://www.ehs.neu.edu/hazardous_waste/fact_sheets/sodium_azide/

"Sodium azide reacts with heavy metals (such as silver, gold, lead, copper, brass, or solder in plumbing systems); and metal salts to form an accumulation of the highly explosive compounds such as lead azide and copper azide."

Assume reaction is fast.  How many micromoles of gold/cm^2 constitute your film?  How many micromoles of azide/volume are in your application?  Will the gold be corroded through?

Is the gold there as a convenience or as a necessary surface?  A brief soak in dilute decanethiol solution plus rinse will cover the surface with a monomolecular layer of hydrocarbon, each chain being anchored by its sulfur.  The surface will be passivated and probably hydrophobic. 1-hydroxy-10-decanethiol will give a hydrophilic surface.  Is it worth the bother and expense to diddle with the gold surface?

Gold is selling for $(USD)42.15/g today.  How much gold is in your annual discard pile? When my school dumped a load of ancient undergrad combustion bombs I went through them.  They originally shipped each with a platinum crucible.  One remained.  Half a Troy ounce of platinum was a good hour's tax-free wage.