Q: Please recommend a material for use in 80 deg C oxalic acid solution. The titanium I’m using suffers, and dissolves. My hope is that C276 may work. We do not need high mechanical strength. I’m looking to order M4 and M6 socket head cap screws.
A: Probably the best material for Oxalic Acid at 80C is Alloy 20 screws. An alloy 20 screw will have no corrosion rate up to about 70C at any concentration and is good up to 50%concentration at boiling temperatures. This will fare much better than titanium screws. They will also be more economical than Hastelloy C276.