碳纤维复合材料-钢电偶腐蚀研究

Study of Galvanic Corrosion between Steel and Carbon Fiber Composite

目的研究碳纤维复合材料与船体钢的电偶腐蚀行为。方法采用T700碳纤维复合材料-10CrNiCu钢电偶对在3.5%NaCl溶液中的浸泡实验、电化学试验及实验后的腐蚀形貌分析,对比测定了电偶对中10CrNiCu钢的腐蚀速度,分析了电偶对的腐蚀行为。结果碳纤维与10CrNiCu钢的开路电位差高达850 mV以上,当它们连接形成电偶对时,碳纤维对10CrNiCu钢有很强的电偶效应。当碳纤维的面积与钢的面积比为1∶1时,可使10CrNiCu钢的腐蚀速度至少增大约1.5倍。结论碳纤维单独在3.5%NaCl溶液中的电位基本是氧去极化的平衡电位,当碳纤维复合板与钢连接形成腐蚀电池时,显著促进了氧去极化反应,从而显著促进了钢的腐蚀。

To investigate the galvanic corrosion behavior of galvanic couple between steel and carbon fiber composite,10CrNiCu steel and T700 carbon fiber composite were used.The immersion test and electrochemical test in 3.5%NaCl solution of the galvanic couple samples were carried out,and the corrosion morphology of the samples after test were analyzed.The cor-rosion rates of 10CrNiCu steel in galvanic couple together with its self-corrosion were measured,and the corrosion behavior of galvanic couple was analyzed.The open-circuit potential difference between carbon fiber and 10CrNiCu steel is higher than 850 mV.While the couple between steel and carbon fiber was formed,the strong galvanic action arose from carbon fiber.While the area ratio of steel and carbon fiber was 1:1,the corrosion rate of 10CrNiCu steel increased to over 1.5 times.The potential of carbon fiber alone in 3.5%NaCl solution is about the equilibrium potential of the oxygen reduction reaction.While the galvanic element between steel and carbon fiber composite is formed,the corrosion of steel can be accelerated significantly because the oxygen reduction reaction is promoted significantly.