The　work　aims　to　reveal　the　corrosion　behavior　and　mechanisms　of　newly　developed　WC-WCoB　coating　against　molten　zinc　so　as　to　improve　the　corrosion　resistance　of　WC-based　coatings.　WC-WCoB　thermal　spray　feedstock　powder　with　a　high　sphericity　and　high　density　was　prepared　by　the　centrifugal　spray　drying　and　subsequent　vacuum　heat-treatment　with　WC,　Co　and　WB　as　raw　materials.　The　coating　was　then　fabricated　by　the　high　velocity　oxy-fuel　(HVOF)　spraying　technique.　The　cross-sectional　microstructures　of　the　coating　after　immersion　in　the　liquid　zinc　for　various　periods　were　observed　to　evaluate　the　corrosion　resistance.　The　composition,　structure　and　oxidation　resistance　of　the　coatings　were　characterized　by　X-ray　diffract　tion,　thermogravimetric/differential　thermal　analysis,　scanning　electron　microscopy　and　energy　spectrum　analysis.　WCoB　phase　had　no　chemical　reaction　with　the　molten　zinc.　Besides,　there　was　no　evidence　showing　the　diffusion　of　Zn　into　the　prepared　WC-WCoB　coating　even　when　the　coating　had　been　immersed　into　the　liquid　zinc　for　600　h.　However,　the　microcracks　were　easy　to　initiate　at　the　outer　surface　of　the　coating　due　to　the　slow　oxidation　of　oxygen　dissolved　in　the　liquid　zinc.　The　cracks　gradually　propagated　towards　the　inner　and　eventually　led　to　the　exfoliation　of　coating　materials　layer　by　layer.　After　the　immersion　in　molten　zinc　for　600　h,　the　area　without　corrosion　accounted　for　56.3%　of　the　total　area　of　the　WC-WCoB　coating.　The　addition　of　a　certain　amount　of　WB　to　the　conventional　WC-Co　coating　can　cause　the　entire　transformation　of　Co　into　the　WCoB　phase.　As　compared　to　the　currently　widely　used　WC-η　coating,　the　developed　WC-WCoB　coating　in　the　present　work　exhibits　much　higher　oxidation　resistance.　As　a　result,　the　formation　and　growth　rates　of　the　oxidation-induced　cracks　in　WC-WCoB　coating　can　be　significantly　decreased,　which　then　contributes　to　better　corrosion　resistance　to　molten　zinc　at　the　macro　level.　©　2019,　Chongqing　Wujiu　Periodicals　Press.　All　rights　reserved.