High-temperature corrosion behavior of C276 alloy, 1.4529 steel and laser-cladding 1.4529 coating under the synergistic action of deposited chloride salt and HCl-containing atmosphere

The corrosion behavior and mechanism of C276 alloy, 1.4529 steel (9 S) and its laser-cladding coating (9 C) in a simulated waste incineration environment were studied by isothermal corrosion tests. The results show 9 C and 9 S have comparable corrosion resistance to C276 at 550 °C, and they are well protected by the mixed product layer rich in Fe and Cr. A loose and porous product layer caused the corrosion resistance of C276 to be lower than expected. At 700 °C, all three materials underwent severe high-temperature electrochemical corrosion and activated oxidation, forming a Ni-rich micro-nano porous surface and multilayer corrosion products.