Cyclic oxidation of Ni-La_2O_3 composite coatings electrodeposited on nickel and Fe26Cr stainless steel

摘要

A coating of nickel with La_2O_3 oxide particles has been codeposited onto the surface of nickel as well as Fe26Cr stainless steel for improving their high temperature oxidation resistance. Both specimens of nickel and Fe26Cr stainless steel deposited with ni-La_2O_3 composites coatings exhibited a much better resistance to cyclic oxidation in air at 900 deg.C than those of the two bare materials. electron probe microscope analyses re- vealed that, for both Ni-La_2O_3 coated nickel and Fe26Cr stainless steel, a La_2O_3-rich NiO layer close to the gas/scale interface was produced after the composite film had been thoroughly oxidized during the thermal cyclic processes.