NOTICE

Forums are temporarily disabled while we are working on a new login procedure.

When migrating the old forums over to our new forums we were unable to retain the identity of the authors, so the old posts will show up as "anonymous". All NEW posts will show up credited to their authors. So please participate and share knowledge just as you have in the past.

You must log in if you are an existing user or register if you are a new user in order to contribute to the discussions.

Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...corrosion of SS 316/304 in acidic beerages - phosphoriccorrosion of SS 316/304 in acidic beerages - phosphoric
Previous
 
Next
New Post
10/19/2003 9:00 AM
 
User is offline 
No Ranking

Joined: 1/1/0001
Posts: 0
dear sir, im doing my thesis on corrosion of orhtodontic wire in acidic beverages - phosphoric acid based and citric acid based and comparing with artificial salova using anodic polarizationat 10mv/15sec. preliminary results show breakdown potential of ss316 in artificail saliva at 550mv whereas in acid beverages, current density was seen to increase steadilyu in small amounts till 1200 form then on current density decreases (Passivation ??) till 1400 from then on a rapid increase was noted. taking into consideration the low pH (2.4) aerated drink, carbonic acid, and phosporic acid i had expected the breakdown to be reached earlier. is there any passivation occuring here due to the presence of phosphoric acid? is this conc. of phosphoric acid (.1%) liable to passivate. i would b grateful if you could provide an opinion regarding this result.
 
New Post
10/28/2003 9:00 AM
 
User is offline 
No Ranking

Joined: 1/1/0001
Posts: 0
There are some theories that phosphoric acid will impart some passivation to the surface of 316 ss, but this is not born out by the data. Phosphoric acid will, in fact, remove iron, chromium and nickel from the surface, but there is no data showing that it will chromium enrich the surface in our tests. Is it possible to get some breakdown of the phosphoric acid under those low voltages? Citric acid will definitely passivate 316 ss, but it requires air drying or some other oxygen donor in the solution in order to form the oxide layer that is necessary for passivation of the surface while still in solution. I am very interested in working with you to help you on your thesis, if you are in need of further assistance.
 
 Page 1 of 1
Previous
 
Next
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...corrosion of SS 316/304 in acidic beerages - phosphoriccorrosion of SS 316/304 in acidic beerages - phosphoric


  

News

NEW! Calculation of Ammonium Salt Deposition Temperatures
With a little delay, our Calculation of Ammonium Salt Deposition Temperatures...read more
Sulfidic corrosion calculators NOW AVAILABLE
Our sulfidic corrosion calculators are now available at hghouston.com/calcula...read more

Stay Current

Sign up for our quarterly newsletter

covering updates on corrosion

Sign Up