电化学阻抗法研究土壤模拟溶液中CFRP/碳钢体系的腐蚀行为  

CORROSIN BEHAVIOR OF CFRP/CARBON STEEL SYSTEM IN A SIMULATED SOIL SOLUTION STUDIED BY ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

作　　者：熊文兵[1] 陈迎锋[1] 路民旭[1] 

机构地区：[1]北京科技大学腐蚀与防护中心,北京100083

出　　处：《腐蚀与防护》2007年第10期503-508,共6页Corrosion & Protection

摘　　要：采用电化学阻抗法(EIS)研究了碳纤维增强树脂基复合材料(CFRP)/碳钢体系在两种土壤模拟溶液中的腐蚀行为。测得的阻抗谱能清楚地反映CFRP/碳钢体系的腐蚀行为。浸泡早期,腐蚀介质的扩散速度小于界面的反应速度,阻抗谱表现出一定的扩散特征;随后阻抗谱为两个半圆;浸泡中后期,界面处形成腐蚀产物膜,阻抗谱表现出明显的Warburg扩散特征,并开始出现第三个时间常数。形貌分析的结果表明碱性腐蚀介质对CFRP的破坏性比酸性腐蚀介质要大,另外碱性介质容易引起体系中碳钢的局部腐蚀,而酸性介质则使碳钢发生均匀腐蚀。Electrochemical impedance spectroscopy （EIS） was employed to study the corrosion behaviour of the carbon fiber reinforced polymer （CFRP）/Carbon Steel system in a simulated soil solution. It was confirmed that the EIS could distinctly reflect the corrosion behaviour of this system. In the early time of immersion, the diffusion speed was less than the speed of the corrosion reaction at the interface and the EIS plots put up somewhat diffusion character. Then characteristic EIS plots with two undistinguishable loops were observed. In the middle and last part of the immersion period, the third time constant and a Warburg diffusion character appeared. Microscopic examination of the sample surface revealed that the alkaline medium was more destructive to the CFRP than the acidic medium. The alkaline medium led to a local corrosion on the surface of the carbon steel, but the acidic medium would result in a general corrosion.

关 键 词：EIS 碳钢 复合材料 腐蚀行为 

分 类 号：TG172[金属学及工艺—金属表面处理]