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High Temperature Oxidation and Sulfidation of Ni-15at.%W Coatings
Chanwou Kim,Teayoul You,Yuriy Shapovalov,Jaehwang Ko,Dongbok Lee,Kyuhwan Lee,Doyon Chang,Dongsoo Kim,Sikchol Kwon 한국표면공학회 2005 한국표면공학회지 Vol.38 No.1
Ni-15at. %W coatings with film thicknesses of 20-40 ㎛ were electroplated on a steel substrate, and their oxidation behavior was investigated at 700 and 800℃ in air. For comparison, a pure Ni coating and a bulk Ni were also oxidized. The Ni-15at. %W coating displayed the worst oxidation resistance, due to the formation of less-protective NiO, Fe₂O₃, NiFe₂O₄and NiWO₄. The corrosion behavior Ni-15at.%W coatings electroplated on a steel substrate was similarly investigated at 700 and 800℃ in the Ar-1%SO₂ atmosphere. For comparison, the uncoated steel substrate was also corrosion-tested in the Ar-1%SO₂ atmosphere. Severe scale spallation and the internal corrosion of the steel that occurred in the uncoated substrate were not observed in the coated specimen. However, it seemed that the Ni-15at.%W coating cannot be a potential candidate as a sulfidation-resistant coating, due to the formation of less-protective NiO, NiS, WO₃ and NiWO₄.