Not usually used in chemical plant. Nickel Alloys Alloy 400 Alloy 625 Alloy 825 Alloy B2 Alloy C276 Generally good resistance to a wide range of acids and alkalis. Resistance to sea water and brine but can suffer crevice corrosion. Excellent sea water crevice corrosion resistance. Resistant to organic alkalis and salts, H 2 S and some acids. Principally used for HCI under reducing conditions ...