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王安东 陈跃良 卞贵学.CF8611/AC531复合材料性质及其与7B04铝合金接触腐蚀的电化学研究[J].南京航空航天大学学报,2018,50(1):91-99
CF8611/AC531复合材料性质及其与7B04铝合金接触腐蚀的电化学研究
Electrochemical Study on Property of CF8611/AC531 Composite and Its Contact Corrosion with 7B04 Aluminum Alloy
  
DOI:10.16356/j.1005-2615.2018.01.013
中文关键词:  复合材料  电化学  铝合金  偶接  腐蚀
英文关键词:composite  electrochemistry  aluminum alloy  coupling  corrosion
基金项目:
作者单位
王安东 陈跃良 卞贵学 海军航空大学青岛校区航空机械工程与指挥系青岛266041 
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中文摘要:
      设计了CF8611/AC531复合材料的正面(Front surface,FS)试件和侧面(Side surface,SS)试件及3.5%NaCl+12.5%Cu2SO4电解液,借助电化学工作站、扫描电镜和扫描振动电极等设备,开展了复合材料和7B04-T74铝合金在不同状态下的电化学测量及偶接全浸试验。在恒温35 ℃、3.5%NaCl溶液中浸泡0h和96h后,FS试件自腐蚀电位和自腐蚀电流密度分别为96和117 mV,1.742×10-7和2.213×10-7A/cm2,铝合金则分别为-870和-897 mV,2.920×10-5和3.068×10-5A/cm2。FS和SS试件在恒温35 ℃、3.5% NaCl+12.5% Cu2SO4电解液中的极化电流密度分别为3.99×10-4和1.01×10-3A/cm2,且在碳纤维裸露处均有明显Cu金属沉积;在恒温35 ℃、3.5% NaCl电解液中,FS/7B04偶对电偶电流密度均值为6.75E×10-6 A/cm2,低于SS/7B04偶对的6.2×10-5 A/cm2。结果表明:复合材料电化学性能稳定;FS试件电化学活性低于SS试件;证明了碳纤维在复合材料电化学响应中的贡献,指出了原始表面存在碳纤维裸露缺陷,由此划分了活性阴极区和惰性阴极区;接触腐蚀中铝合金的主要腐蚀形式是点蚀,并伴有少量沟状腐蚀,揭示了沟状腐蚀的发生机理和发展路径;SS试件对铝合金的电偶效应较FS试件显著,讨论了偶对中复合材料未失效的原因,指出表面阴极点及Al3+的水解可能会减弱电偶效应。
英文摘要:
      The front surface (FS) specimen and side surface (SS) specimen of CF8611/AC531 composite and the electrolyte with 3.5% NaCl+12.5% Cu2SO4 are designed. With the electrochemical workstation, scanning electron microscope, scanning vibrating electrode and other equipment, the electrochemical measurement of CF8611/AC531 composite and 7B04-T74 aluminum alloy and the immersion test of the coupling specimens are carried out. After soaking in the 35 ℃,3.5% NaCl electrolyte for 0 h and 96 h, the self-corrosion potential and self-corrosion current density of FS are 96 and 117 mV, 1.742×10-7and 2.213×10-7 A/cm2, and those of the aluminum alloy are -870 and -897 mV, 2.920×10-5 and 3.068×10-5A/cm2, respectively. The polarization current densities of FS and SS specimens in the 35 ℃, 3.5% NaCl + 12.5% Cu2SO4 electrolyte are 3.99×10-4 and 1.01×10-3A/cm2 separately, and the Cu metal is obviously deposited on the exposed carbon fiber. In the 35 ℃,3.5% NaCl electrolyte, the galvanic current density of FS/7B04 is 6.75×10-6 A/cm2 and it is less than that of SS/7B04 with 6.2×10-5 A/cm2. The results show that, the electrochemical property of the composite is stable. The electrochemical activity of FS specimen is lower than that of SS specimen. The contribution of the exposed carbon fiber in the electrochemical response of the composite is proved. There are some exposed carbon fiber defects on its original surface and it is divided into the active cathode area and the inert cathode area. The main corrosion form of the aluminum alloy in coupling specimens is pitting, accompanied by a small amount of trenching form. The occurrence mechanism and development pathway of trenching corrosion are revealed. The galvanic effect of SS specimen on the aluminum alloy is significant than that of FS specimen. No evidence of degradation of the composite is revealed and the reason is discussed. The cathode site on the surface and the hydrolysis of Al3+ could weaken the galvanic effect.
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