Pickling for Inconel Overlay

[goodbadgood]

Any idea what pickling agent we should use for inconel 625 weld overlays?

 

[EdStainless]

Why don't you look in the Special Metals data sheet.
I would start with the solution at room temp though since the over lay will not be nearly as corrosion resistant as the bulk alloy.
If it were me I would start with 25% Nitric and 5% HF.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[weldstan]

Often pickling is not mandated for 625 corrosion resistant. If required see Ed!

 

[metengr]

If you pickle 625 weld overlays, which I have seldom seen, be very careful of the time exposure. Weldments are cast structures and as such will behave different in comparison to wrought material.

 

[goodbadgood]

Thanks guys for your comments. Actually its a requirement of our client specifications however they have not mentioned the pickling agent. I have also a bit surprised and never heard of pickling for inconel. Hno3 and hf id normally used for stainless steels

 

[metengr]

You should go back and discuss with your client, they may be misinformed.