Can anyone tell me if passivation of a stainless steel tank will remove or inactivate a biofilm?
passivation process of cleaning stainless steel tanks involves cleaning with NaOH and citric acid followed by nitric acid (up to 20% at 120F) and a complete water rinse. This process will restore the film, remove metal particles, dirt, and welding generated compounds (e.g. oxides).
In the context of corrosion, passivation is the spontaneous formation of a hard non-reactive surface film that inhibits further corrosion. This layer is usually an oxide or nitride that is a few atoms thick
if both the above process are followed Biofilm can be removedInteresting article to go throughBIOFILM FORMATION AND CONTROL IN FOOD PROCESSING FACILITIES members.ift.org/NR/rdonlyres/1F685508-6646-4F2E-9D3F-9FC132D0E949/0/crfsfsv02n1p022032ms20010630.pdfalso referHow to remove Biofilm in water system www.askaboutvalidation.com/forum/showthread.php
It is acid and alkali treatment and it should remove biofilm.
does anyone want to note pharmacopoeial take on this? Is it part of cleaning validation?
Hi wee p, go to www.astropak.com. Astro Pak is the passivation expert in the U.S. They even have a blog where you can ask their Chief Scientist all of your cleaning and passivation questions. It's called "As Doc". Good luck!
Hi visit this site. they have good experiencehttp://www.orbitindustries.com/pages/pickle%20and%20passivate/pass.htm