A　series　of　Ni-based　cored　wires　with　different　boron　content　were　designed　to　prepare　corrosion-resistant　coatings　by　two-roll　wire-arc　spraying,　which　was　expected　to　be　an　alternative　method　with　sufficient　protection　and　could　reduce　maintenance　of　waste-to-energy　(WTE)　plants.　The　as-deposited　coatings,　which　primarily　are　composed　of　nanocrystalline,　exhibit　uniform　and　dense　layered　structure　with　the　porosity　around　3%.　We　select　thermo-gravimetric　technique　to　investigate　the　high-temperature　corrosion　behavior　of　the　coatings　in　molten　salt　environment　(Na2SO4-10　wt.　%　NaCl)　at　800°C.　As　a　result,　all　the　coatings　present　extremely　lower　corrosion　rates　compared　with　that　of　the　SA　213-T2　substrate　during　all　tests.　Due　to　the　formation　of　composite　surface　oxide　film,　including　Cr2O3　and　NiCr2O4,　which　prevents　the　diffusing　or　penetrating　of　corrosive　species.　Furthermore,　the　boron　content　expresses　a　significant　influence　on　the　corrosion　behavior　of　the　designed　coatings,　leading　to　the　relatively　best　performance　of　the　coating　with　16　at.　%　boron　added.　In　most　status,　wire-arc　sprayed　Ni-based　coatings　could　be　an　effective　and　economic　approach　to　withstand　corrosion　and　extend　the　lifetime　of　the　super-heater　tubes　in　WTE　plants.　Copyright　2012　ASM　International®　All　rights　reserved.