Go to YouTube and search on "electrolysis". There is a ton of videos on the subject. Googling the same word will produce multiple sites. A simple battery charger, plastic tub, and washing soda will have you up and running in no time. Just remember - the negative power lead goes to the relic, the positive to the "sacrificial" metal.
Bruce - if you PM your email address to me I'll be glad to send you a Word document with detailed instructions on how I perform electrolysis on iron artifacts.