Certified Technology, Inc. also does passivation on stainless steel. We have an environmentally friendly Citric Acid bath that meets all requirements of ASTM A-967 and AMS 2700 specifications. We also have Nitric Acid bath for different grades of stainless steel that meets A967-96 and AMS 2700C.  Passivation pieces can measure up to 26″x22″x22″. Bucket or rack is available to meet your needs.