| DAI Yi-fan,SHEN Shi-tai,LU Jie-qin,WEI Guo-ying.2024 Aluminum Alloy Anodic Oxidation in Mixed Acid[J],47(1):198-202 |
| 2024 Aluminum Alloy Anodic Oxidation in Mixed Acid |
| Received:April 10, 2017 Revised:January 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.01.031 |
| KeyWord:2024 aluminum alloy mixed acid anodic oxidation corrosion resistance hardness surface morphology |
| Author | Institution |
| DAI Yi-fan |
School of Material Science & Engineering, China Jiliang University, Hangzhou , China |
| SHEN Shi-tai |
School of Material Science & Engineering, China Jiliang University, Hangzhou , China |
| LU Jie-qin |
School of Material Science & Engineering, China Jiliang University, Hangzhou , China |
| WEI Guo-ying |
School of Material Science & Engineering, China Jiliang University, Hangzhou , China |
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| Abstract: |
| The work aims to study difference in anodized film thickness, surface morphology, corrosion resistance, etc. by anodizing 2024 aluminium alloy in mixed acid solution and preparing anodized films. The 2024 aluminium alloy was anodized in sulfuric acid - sulfosalicylic acid - lactic acid system. Changes in surface morphology, microhardness, thickness, crystal structure and corrosion resistance were observed by changing oxidation time (20~60 min) and oxidation current density (2.5~4.5 A/dm2). A series of anodized film was obtained by maintaining the oxidation time at 40 min and changing current density. The self-corrosion potential was the most positive and close to 0.0 V when current density was 3.0 A/dm2. The corrosion potential decreased as the current density increased. The corrosion potential was the most negative (-1.1 V) when the current density was 4.5 A/dm2. A series of anodized film was obtained by maintaining current density at 2.5 A/dm2 and changing oxidization time. The corrosion resistance was the best and the self-corrosion resistance was -0.6 V when the oxidization time reached 50 min. The XRD analysis showed that the anodized films were composed of γ-Al2O3 and α-Al2O3. The microhardness and thickness of the anodized films increased as the current density and oxidization time increased. The anodized layers exhibit the best corrosion resistance provided with the current density of 3.0 A/dm2 and oxidation time of 50 min. |
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