This　study　investigates　the　corrosion　resistance　and　protective　mechanisms　of　laser-clad　Al2O3-doped　Inconel　625　coatings　under　high-temperature　acidic　conditions.　Inconel　625-xAl2O3　coatings　were　fabricated　via　laser　cladding　and　tested　in　high-temperature　acidic　environments　simulating　pipeline　conditions.　Corrosion　media　included　HCl,　H2SO4,　HF,　HBr　(pH=3),　and　their　1:1:1:1　mixed　acid.　High-temperature　cyclic　titration　was　employed　for　corrosion　testing,　while　XRD,　SEM,　EDS,　and　laser　confocal　microscopy　were　used　to　analyze　microstructure,　composition,　and　corrosion　products.　Results　show　that　increasing　Al2O3　content　significantly　enhances　corrosion　resistance,　reducing　rates　by　57.9　%　in　HCl　and　46.4　%　in　HF.　Al2O3　forms　a　stable　protective　layer,　acting　as　a　physical　barrier　and　inhibiting　grain　growth.　A　dual-layer　oxide　film　(Al2O3　and　Cr2O3)　effectively　blocks　corrosive　substance　diffusion,　further　enhancing　protection.　This　study　elucidates　the　pivotal　role　of　Al2O3　in　improving　the　corrosion　resistance　of　Inconel　625　coatings　and　offers　novel　insights　for　the　development　of　high-performance　protective　coatings　tailored　for　extreme　environments.