Titanium corrosion
Titanium corrosion
(OP)
Is commercially pure titanuim susceptible of severe general corrosion in a hot (90°C) hydrogen peroxide bearing (0.7M)solution ?
Regards
Regards
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: Titanium corrosion
Titanium alloys are generally highly resistant to oxidizing media and oxidizing acids over a wide range of concentrations and temperatures. Although peroxides are generally oxidizing, titanium alloys can experience general corrosion in aqueous peroxide solutions, depending on concentration, temperaure, and pH. Corrosion rates are minimal in dilute near-neutral hydrogen peroxide solutions, but increase dramatically under alkaline conditions because of the formation of soluble titanium-peroxyl (complex) compounds. However, corrosion is effectively inhibited by small additions of calcium, strontium, or barium ions. Sodium silicate and sodium hexametaphosphate have also been shown to reduce corrosion rates substantially. Significant attack may occur in highly concentrated (90%) H2O2 solutions.
The closest data I could find is this: 66 C, pH 1
5% H2O2 - corrosion rate = 0.152 mm/yr
5% H2O2 + 500 ppm Ca2+ - corrosion rate = nil
20% H2O2 - corrosion rate = 0.686 mm/yr
20% H2O2 + 500 ppm Ca2+ - corrosion rate = nil
66 C, pH = 4.3
5% H2O2 - corrosion rate = 0.061 mm/yr
70 C, pH 11
0.75 g/L H2O2 - corrosion rate = 0.42 mm/yr
60 C
10 g/L H2O2 + 20 g/L NaOH - corrosion rate = 55.9 mm/yr
60 C
3.5 g/L H2O2 + 10 g/L NaOH + 10 g/L Na2SiO3 + 0.5 g/L Na3PO4 - corrosion rate = nil
RE: Titanium corrosion
Consider:
www.titanium.org
www.timet.com
and
www.corrosion-doctors.org
Good Luck
MJC
RE: Titanium corrosion
RE: Titanium corrosion
see Dupont's website at www.teflon.com
What service application would the Titanium be used in? I may be able to help more depending on what exactly your needs are.
Greg
RE: Titanium corrosion