EDG
09-27-2014, 01:19 PM
This PDF is a copper industry paper about the use of benzotriazole to prevent the corrosion of brass.
Before I bought a tumbler about 1970, I cleaned a lot of cases with the vinegar and salt solution.
No matter how well I rinsed the brass it would always turn dark over time. Vinegar helped remove corrosion but it seemed to leave the cases unprotected after it stripped the corrosion off the cases.
Birchwood Casey Case Cleaner is an acid based cleaner that I have used for a long time to clean cases. It will also rehabilitate corroded brass. Cases treated and not tumbled will retain the acid cleaned finish for 5 years or more without tarnish. Reviewing the BC MSDS revealed the benzothiazole ingredient. From the paper it appears that you can use a solution of .25% benzothiazole in water at 60degrees C or 140F for 2 minutes to provide tarnish and corrosion protection for your brass.
http://www.copper.org/publications/pub_list/pdf/a1349.pdf
Before I bought a tumbler about 1970, I cleaned a lot of cases with the vinegar and salt solution.
No matter how well I rinsed the brass it would always turn dark over time. Vinegar helped remove corrosion but it seemed to leave the cases unprotected after it stripped the corrosion off the cases.
Birchwood Casey Case Cleaner is an acid based cleaner that I have used for a long time to clean cases. It will also rehabilitate corroded brass. Cases treated and not tumbled will retain the acid cleaned finish for 5 years or more without tarnish. Reviewing the BC MSDS revealed the benzothiazole ingredient. From the paper it appears that you can use a solution of .25% benzothiazole in water at 60degrees C or 140F for 2 minutes to provide tarnish and corrosion protection for your brass.
http://www.copper.org/publications/pub_list/pdf/a1349.pdf