The Last Stand of the web we knew & loved: no cost, no reg'n, no popups
As an Amazon Associate & eBay Partner: we earn from qualifying purchases

finishing.com -- The Home Page of the Finishing Industry

-----

Finding no aluminum sulphate in anodizing tank although I put it there

February 3, 2010

I have a 98 liter acid anodizing tank. I added about 600 grams of aluminum sulphate (pellets) into the tank. I mixed the tank, agitated the tank and let the aluminum dissolve to the best of my ability..

When I titrate I see NO ALUMINUM content..

Where is all this aluminum going? I am really puzzled on this one.

Please help.

Garrett P
Hobbyist - Tampa, Florida

Hi Garrett,

It is difficult to help when you say nothing about the analytical method used. If you will tell us, then some suggestions as to how improve the method and find the "lost aluminium".

Remember that if you are using a standard method for anodising solution analysis, the aluminium that you have added will be on the limit of detection. Assuming that you used the normal .16H2O salt you will have added only about 0.6 g/l Al. The Al content of an anodising bath will commonly be 5 - 25 g/l and a resolution of 1 g/l is fine.

Harry Parkes
- Birmingham, UK
February 8, 2010

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: