Sudden high conductivity in Phosphoric acid anodizing bath
Serious Education ... plus the most fun you can have in metal finishing. January 18, 2011 I have a 1400 gallon tank used for phosphoric anodizing . Just overnight the bath became highly conductive and is causing aluminum parts to etch similar to running the rectifier in reverse. What could have caused a contamination to the bath? Ron Tautic Employee - Suffield, Connecticut, USA January 19, 2011 Hi, Ron. I'd suspect the rectifier before the plating bath. Are you verifying the conductivity in some independent way? Regards, Ted Mooney, P.E. RET finishing.com Pine Beach, New Jersey January 20, 2011 It sounds like someone added some hydrochloric acid to your anodize tank. Check it for chlorides. Unfortunately, there is no cure for this problem . Lyle Kirman Lyle Kirman consultant - Cleveland, Ohio January 20, 2011 It's definitely the bath. We took approx. 5 gallons and ran it in a small test tank with a portable rectifier and it acted the same as the 1400 gallon tank. Extremely ...