Effect of Electroless Ni Composited Coatings on the Stress-Corrosion Cracking Chracteristics of AA7075 Alloy in 3.5% NaCl Solution
| Autor: | Chung-Sheng Chang, 張中生 |
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| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 This study used electroless plating process to prepare Ni-P composite coating on AA7075 aluminum alloy surface after anodizing treatment. The Stress-Corrosion Cracking (SCC) charactenrstics for the coating in 3.5%NaCl aqueous solution via slow strain rate test was also studied. The surface morphology, element composition and surface hardness of the coatings were analyzed by SEM, EDS and Vicker’s hardness tester. The corrosion and wear-corrosion resistance of electrolessplating Ni-P composite coating in 3.5% NaCl aqueous solution was evaluated, and also analyzed by electrochemical polarization measurement. Experimental results indicated that electrolessplating Ni/P composite coating has high hardness, good corrosion resistance, particularly owing to the anodizing treatment of aluminum alloy. The anodizing treatment of AA7075 aluminum alloy substrate efficiently improved the adhesion, surface morphology and hardness of the electroplated Ni/P composite coating. The results also indicated that the anti-SCC of the coating is potentiodynamic polarization significantly increased in 3.5% NaCl aqueous solution. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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