Processing Technology And Performance Study On The Anti-wear Anti-corrosive Coating Of Anode Oxidation Aluminium Alloy

Variety classification methods, anode oxidize mechanism, progress of anode oxidize aluminium alloy are introduced. Two kinds of aluminium alloy anodic oxidation, common anodic oxidation and hard anodic oxidation are introduced in this paper. The two kinds of anodic oxidation have different performances and different process according to applying occasion.Especially for high anti-wear and anti-corrosion of aluminium alloy film in peculiar field of china ,we study on anode oxidize aluminium alloy technics and porous aluminium alloy,then add abrasion resistance matter n-SiC or PTFE to oxidize electrolyte ,let n-SiC or PTFE deposit in the aluminium alloy film.the film get good wearable and anti-corrosive.The orthogonality experiment method has been used to optimize the technological parameters of the composite anode oxidize,addition n-SiC technological parameters show that: Temperature 20℃,n-SiC 20 mg/L, current density 2 A/dm~2,oxide general time 40 minutes ; addition PTFE technological parameter show that: Temperature 10℃,PTFE 15% of the whole volume,current density 2 A/dm2,oxide general time 40 minutes.These surfaces and interfaces of common anode oxide coating,hard anode oxide coating,addition n-SiC composite anode oxidize coating and addition PTFE composite anode oxidize coating were investigated by these instruments such as thickness measuring instrument , micro hardness instrument , metallographic microscope. SEM and EDS instrument have confirmed that SiC and PTFE had already entered into the oxidized film. After detecting those anode oxidize film performance by abrasion tester and salt fog corrosion ,the abrasion resistance detecting indicates that addition n-SiC can improve anti-wear,and addition PTFE can arriving at friction reducing,the friction coefficients can lowered to 0.13.And salt fog corrosion detecting indicates that addition n-SiC or addition PTFE can prolong corrosion resistance time: addition n-SiC composite anode oxidize can bear 207 hours , addition PTFE composite anode oxidize can bear 210 hours.