Topic: Effects of Sulphuric Acid Anodizing of Titanium
Hi all, I have a query and was hoping someone might be able to offer some advice.
I work for a check valve manufacture and we are supplying some small Titanium (B348 Grade 2) valves where they will be used in a PTA plant where corrosion is a big issue. There is a restriction placed on the chemical analysis of the titanium where by the Hydrogen content must be <60PPM. The material we are supplying is certified as such.
The Titanium valve bodies have been finished by Sulphuric Acid Anodizing which has raised the following query from our customer:
"The anodizing procedure adopted (using sulphuric acid) has the potential to introduce hydrogen into the titanium which, at concentrations above 60ppm, causes severe corrosion of the titanium. Please confirm that the hydrogen in the titanium after anodisation is < 60 ppm."
Can anyone offer any advise on this query or know of any non-destructive method of analysing the hydrogen content of the anodized surface of the valve in order to confirm compliance with the hydrogen content restriction.
Any help would be most appreciated.
Thanks,
Lee Inglis.