| LI Ming,CNENG Cong-gao,LI Min-wei.The Influence of Annealing Temperature on Microstructure of LF6M Aluminum Alloy Substrates and Anodic Oxide Films[J],39(6):33-35,86 |
| The Influence of Annealing Temperature on Microstructure of LF6M Aluminum Alloy Substrates and Anodic Oxide Films |
| Received:August 10, 2010 Revised:December 10, 2010 |
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| DOI： |
| KeyWord:LF6M aluminum alloy annealing temperature anodic oxide β-particles |
| Author | Institution |
| LI Ming |
China Aero-Polytechnology Establishment, Beijing , China |
| CNENG Cong-gao |
China Aero-Polytechnology Establishment, Beijing , China |
| LI Min-wei |
China Aero-Polytechnology Establishment, Beijing , China |
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| Abstract: |
| LF6M aluminum alloys annealed at 220℃ were retreated at 320℃. The influence of annealing temperature on microstructure of LF6M aluminum alloy substrates and anodic oxide coatings formed in sulfuric acid solution was studied. The anodic behavior of LF6M alloys in sulfuric acid solution was researched using potentiodynamic polarization curves.β-phase particles concentrated in grain boundaries of LF6M alloys annealed at 220℃, but distributed equably in grains and boundaries for alloys treated at320℃.β-phase particles dissoluted preferentially during anodic oxidation and cavities formedin the films on both annealing condition.For LF6Malloys annealed at220℃, larger cavities were caused by preferential dissolution ofβ-phase particles along grain boundaries,which lead to the decline of the oxide films'corrosion resistance. However, retreatment at 320 ℃ could restrain the formation of larger cavities in the oxide films. |
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