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Confirming what others have shared. Citric acid "wipe passivation" is all you would need. We own a contract manufacturing business for medical devices (spine and ortho surgery instrumentation and implants). The passivation spec all of our customers use is ASTM A967. This allows for citric or nitric passivation. Our customers and ISO 13485 require all of our "special processes" (which includes passivation) to be validated, so we have done all of the boil and copper sulfate testing on coupons that have been wipe passivated with citric (which is literally a thousand pages of documentation and who knows how many hundreds of coupons tested). Anyone working in ISO environments knows IQ, OQ, PQ.....blah blah blah. All of our instruments are wipe passivated after laser or tig welding. We wipe on, let sit for a couple minutes then wipe away with rubbing alcohol. We use a product called CitriSurf 2250 Gel. We avoid nitric at our facility just because of the added EPA regulations. I figure if it's good enough for the FDA and sterile instruments being used in the OR, should work for your application! Happy passivating.

There is a company called Stellar solutions that makes a citric acid gel specifically for stainless passivation. Citric is a lot safer to work with than nitric, and the gel is great for spot treatments because it stays put for a long time.

Hi George, Caught your thread mentioning you are seeking a still manufacturer for your equipment. Specific Mechanical Systems, based out of Victoria, BC has manufactured custom distilling systems for about 4 years. We manufacture the systems completely in Victoria, using copper imported from Germany. North American quality and service, nothing but the best! Please visit our website: www.specificmechanical.com, or send me an email for additional information. vaughan@specific.net. I will be happy to have a chat about your distilling plans and work up a quote that suits your distilling requirements! Cheers! Vaughan Distilling Systems.pdf