The　work　aims　to　improve　the　corrosion　resistance　of　aluminum　alloys　based　on　good　electrical　conductivity.　A　layer　of　Ni-P　alloy　was　electroless　plated　on　the　surface　of　aluminum.　The　effects　of　coating　thickness　on　the　corrosion　resistance　and　electrical　conductivity　of　the　samples　were　investigated.　Corrosion　resistance　of　aluminum　alloys　with　and　without　Ni-P　coatings　in　simulated　tunnel　seepage　environment　was　analyzed　by　electrochemical　test　and　immersion　test.　When　the　thickness　of　the　electroless　Ni-P　coating　was　11.6　μm,　the　coating　was　dense　without　pinholes　and　the　surface　was　smooth,　with　uniform　distribution　of　the　cauliflower-like　nodules　and　the　sample　had　the　best　electrical　and　corrosion　resistance.　The　resistivity　of　the　sample　increased　as　the　coating　thickness　increased.　When　the　thickness　of　the　coating　was　11.6　μm,　the　measured　volume　resistivity　of　the　sample　was　3.01×10–8　Ω·m.　The　impedance　value　of　the　sample　in　3.5wt%　NaCl　solution　increased　first　and　then　decreased　with　the　increase　of　the　thickness　of　the　coating.　The　sample　had　the　best　corrosion　resistance　when　the　coating　thickness　was　11.6　μm.　In　the　corrosion　medium　of　pH=2,　3.5wt%　NaCl　and　pH=12,　the　self-corrosion　current　density　of　the　samples　after　electroless　nickel　plating　was　reduced　by　30%,　60%　and　5　orders　of　magnitude,　respectively,　relative　to　the　aluminum　matrix.　The　Ni-P　coating　with　a　thickness　of　11.6　μm　can　give　the　aluminum　alloy　the　best　corrosion　resistance　in　each　simulated　environment　while　ensuring　good　electrical　conductivity.　©　2020,　Chongqing　Wujiu　Periodicals　Press.　All　rights　reserved.