-w-p-siccompositecoatinginh2so4andh3po4solutioisgapandintergranularcorrosion，andinhclandfecl3solutioispointandintergranularcorrosion.
resultsofhardneandwearresistanceofthecompositecoatingsshowthatthehardneofthecoatingsincreaseswithincreasingheattreatmenttemperature，anditreachespeakvalueat400oc.butitdecreaseswithincreasingheattreatmenttemperaturecontinually.besides，thehardneofthecoatingbyverticalhangingbetweencathodeandanodeismuchhigherthanthatofonebyparallelhangingbetweencathodeandanode.theabrasionrateofthecompositesishighestatas-deposited，whileitdecreaseswiththeriseoftemperature，itcutsdownlowestat400oc.buttheabrasionrateincreaseswithcontinuingraisingheattreatmenttemperature.thewearresistanceofthecoatingisraisedwithincreasingthephohoruscontentinthedeposit.thehardneandwearresistanceofthecompositeincreasewithexteionofheattreatedtimeat400oc，andtheyreachtheirpeakvaluesat3hoursreectively.however，thehardneandwearresistanceofthecoatingdecreasewiththeriseoftheheattreatedtime.thehardneandwearresistanceofthere-ni-w-p-siccompositecoatingincreasewiththeriseofsicandsodiumtungstateconcentratiointhebathreectively，whilethehardneandwearresistanceofthere-ni-w-p-siccoatingdecreasewithincreasingsodiumhypophohateconcentrationinthebath.
microstructureofelectrodepositedre-ni-w-p-siccompositecoatingwasstudied，andresultsshowthatthere-ni-w-p-siccompositecoatingisamorphousas-deposited.whilethecoatingchangesintothecrystalandni3pphasesprecipitatewhenheattreatedtemperatureisraisedto200oc；thecrystalp

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