A　series　of　NiCrB　coating　was　deposited　using　the　twin　wire　arc　spraying　technique　with　a　newly　designed　NiCrB　(B:　0-4　wt%)　cored　wire,　aiming　to　protect　the　boiler　tubes　used　in　the　waste-to-energy　plant.　The　hot　corrosion　behavior　of　the　coatings　was　investigated　with　the　molten　salt　(Na2SO4　+　10%　NaCl,　wt%)　at　800　degrees　C　for　200　h　using　the　thermogravimetric　technique.　The　SEM/EDS　and　XRD　results　showed　that　the　addition　of　element　B　alleviated　the　oxidation　tendency　in　the　as-deposited　coatings.　Sufficient　free　stage　Cr　atoms　diffused　to　coating　surface　timely　to　form　protective　scale,　which　inhibited　further　rapid　corrosion,　owing　to　low　oxides　in　the　coating.　In　addition,　the　corrosion　resistance　was　influenced　by　the　B　content　of　the　coating.　In　the　present　study,　the　coating　with　1-2%　wt%　B　had　the　best　hot　corrosion　performance.