| Cl~-浓度对SiC_P/Al复合材料电化学腐蚀行为的影响 |
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| 引用本文： | 崔霞,周贤良,欧阳德来,宋龙飞,刘阳,陈凌.Cl~-浓度对SiC_P/Al复合材料电化学腐蚀行为的影响[J].复合材料学报,2016,33(11):2569-2575. |
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| 作者姓名： | 崔霞 周贤良 欧阳德来 宋龙飞 刘阳 陈凌 |
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| 作者单位： | 1. 南京航空航天大学 材料科学与技术学院, 南京 210016;
2. 南昌航空大学 材料科学与工程学院, 南昌 330063 |
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| 基金项目： | 国家自然科学基金(51262023)，江西省金属材料微结构调控重点实验室开放基金(JW201323001) |
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| 摘 要： | 采用浸泡模拟实验方法、电化学极化和电化学阻抗谱测试技术,研究了Cl~-浓度对SiC_P/Al复合材料电化学腐蚀行为的影响。结果表明:SiC_P/Al复合材料在Cl~-介质下钝化现象不明显,腐蚀过程主要为点蚀腐蚀。随Cl~-浓度增加,SiC_P/Al复合材料腐蚀速率增加,点蚀电位降低,且复合材料的腐蚀过程机制表现为由单纯电荷传递过程机制向电荷传递过程与腐蚀产物扩散共同作用的混合机制转变。电化学阻抗谱随Cl~-浓度增加呈现出2种类型:单一容抗弧类型、高频区容抗弧和低频区一条与实轴呈45°直线(经典Warburg阻抗)组合的复合类型。
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| 关 键 词： | Cl-浓度 极化 阻抗 腐蚀 SiCP/Al复合材料 |
| 收稿时间： | 2015-11-02 |
Effect of Cl-concentration on electrochemical corrosion behavior of SiCp/Al composites |
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| CUI Xia,ZHOU Xianliang,OUYANG Delai,SONG Longfei,LIU Yang,CHEN Ling.Effect of Cl-concentration on electrochemical corrosion behavior of SiCp/Al composites[J].Acta Materiae Compositae Sinica,2016,33(11):2569-2575. |
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| Authors: | CUI Xia ZHOU Xianliang OUYANG Delai SONG Longfei LIU Yang CHEN Ling |
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| Affiliation: | 1. School of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China |
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| Abstract: | The effect of Cl- concentration on the electrochemical corrosion behavior of SiCP/Al composites was inverstigated by using immersion test, electrochemical polarization and electrochemical impedance spectroscopy test technique. The results show that passivation is not obvious of SiCP/Al composites in Cl- medium and the corrosion process is mainly pitting corrosion. With increasing of Cl- concentration, the corrosion rate of SiCP/Al composites increases, the pitting potential decreases, and the corrosion mechanism of the composites presents the characteristics of transfering from a unique charge transfer process mechanism to a mixed mechanism control of charge transfer process and corrosion production diffusion. Electrochemical impedance spectroscopy exhibits two type with increasing of Cl- concentration:a unique capacitance arcs type and a mixed type including a capacitance arcs in high frequency region and a straight line with the real axis of 45° (classics Warburg resistance) in low frequency. |
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| Keywords: | Cl-concentration polarization impedance corrosion SiCP/Al composite |
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