Corrosion Behavior and Protection Efficiency of 2024Al and SiCp2024Al Metal Matrix Composite

Abstract

Abstract: The corrosion resistance of 2024 Al and SiC particle reinforced 2024 Al metal matrix composite (SiCp/2024Al MMC) in 3.5% NaCl solution was investigated with electrochemical method and immersion test, and the corrosion protection of sulfuric acid anodized coatings on both materials was evaluated by electrochemical impedance spectroscopy. The results showed that the SiCp/2024Al MMC is more susceptible to corrosion than its matrix alloy in 3.5% NaCl. For 2024Al, the anodized coating provides excellent corrosion resistance to 3.5% NaCl.The anodized coating on the SiCp/2024Al provides satisfactory corrosion protection, but it is not as effective as that for 2024Al because the structure of the anodized layer is affected by the SiC particulates.

Key words: 2024 Al, Metal matrix composite, Anodizing, Electrochemical impedance spectroscopy...

Chunlin HE, Changsheng LIU, Fengqin LI, Qingkui CAI, Zhiming SHI, Liqing CHEN, Jing BI. Corrosion Behavior and Protection Efficiency of 2024Al and SiCp2024Al Metal Matrix Composite[J]. J Mater Sci Technol, 2002, 18(04): 351-353.

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Corrosion Behavior and Protection Efficiency of 2024Al and SiCp2024Al Metal Matrix Composite

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