Alloy Resistant to Bleach
Alloy Resistant to Bleach
(OP)
We supply a 17-7 stainless tension spring for an application involving a chlorine bleach type disinfectant (specifically,sodium dichloro S tirazinetrione). We are getting corrosion fatigue failures in a matter of a couple of weeks.Anybody got ideas on a more resistant alloy?





RE: Alloy Resistant to Bleach
Is this a dry powder exposure?
Is this a solution, give details?
Any other information will help.
What are the quantities needed
There are several materials that will be better but getting a spring is a different story.
RE: Alloy Resistant to Bleach
RE: Alloy Resistant to Bleach
What strength level do you need?
I hate to say it, but you do need to look at coatings. An alloy solution will be expensive. Give us some more details and we'll come up with some specific suggestions.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be slowed down.
RE: Alloy Resistant to Bleach
RE: Alloy Resistant to Bleach
RE: Alloy Resistant to Bleach
The following web site is for a Trent tube publication that does list Elgiloy (page 13) with corrosion resistance in several environments. I did not know that this is a spring material used in bioengineering functions.
www.trenttube.com/Trent/downloads/StainlessSteel&Alloy_PDFs/ trent.pdf
Other spring material options include a Carpenter alloy MP35N, or Inconel 718, which has high fatigue strength and is used for spring applications.
RE: Alloy Resistant to Bleach
try this
http://www.trent-tube.com/Trent/literature.htm
go to the the downloads link and open the Stainless Steel and Alloy Tubular Products Handbook
RE: Alloy Resistant to Bleach
I don't like 718 as I seen several references to having problems with corrosion fatigue.
Several other alloys are possible, like 625 and 825 but will be hard to get springs.
If anyone has some older literature from Dupont or SPS there was some information on the Multiphase Alloys. My literature shows MP-35N to have outstanding resistance to stress corrosion and cracking and fatigue in salt water.
This material (sodium dichloro S tirazinetrione)is so common there should be data available all over the place, but I don’t seem to find it. Has anyone got an up to date reference on Ti vs this material. A common trade name is "Dichlor" and a chemical trade name is "sodium dichloroisocynurate"
Here is a supplier of all springs needed.
http://www.dracospring.com/index.html
RE: Alloy Resistant to Bleach
Elgiloy, Alloy 718, MP35N, or a titanium alloy would be good candidates. Beta C or the new Timet LCB (low cost beta) would be my suggestions for suitable titanium alloys. Contact Allvac or Dynamet about the Beta C, and Timet or Perryman about LCB. I am curious about the relative costs of these alloys. It would be great if you or someone else could share some data on this. Good luck.
RE: Alloy Resistant to Bleach
I would worry about Ti if there is caustic used in cleaning. Ti only likes oxidizing conditions and caustics will eat it up.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be slowed down.
RE: Alloy Resistant to Bleach
RE: Alloy Resistant to Bleach
RE: Alloy Resistant to Bleach
I made the link work by copying and pasting into the url address bar, and taking out the space between the slash, and the word trent.pdf if that will help.
rmw
RE: Alloy Resistant to Bleach
We had some cracking problems Aquamet 22 (22-13-5/ Nitronic 50)in a case where there was around 200 ppm Cl. This was on an agitator shaft at around 200° F. Runs good on the boat in salt water.
I would stay with Elgiloy if the cost don’t bite you. This should get you out of trouble will you test other materials.
RE: Alloy Resistant to Bleach
Don't be afriad of C-276, 625 or X-750. They have good corrosion resistance. Your experience with 600 is not unexpected. It has little pitting resistance and micro pits make great stress concentrators. I would expect 800 and 825 to fail under similar conditions.
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be slowed down.