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采用物理混合的方法在Q235碳钢表面制备一种环氧树脂基导电复合涂层。结果表明,E51环氧树脂清漆涂层存在大量的微泡,严重影响涂层的防护性能。导电复合涂层的微泡数量显著降低,经2000 h盐水浸泡和盐雾腐蚀实验结果表明,涂层未出现起泡、剥落等破坏,涂层下的Q235碳钢未发生腐蚀。电化学交流阻抗表明,随着浸泡时间的延长E51清漆涂层的阻抗急剧降低,而复合涂层的阻抗随着浸泡时间的延长而增大,表现出一定的自修复功能。复合涂层的电阻率和附着力分别为103Ω·cm数量级和9.12 MPa。
A physical mixing method was used to prepare an epoxy resin based conductive composite coating on Q235 carbon steel. The results show that there are a lot of microbubbles in E51 epoxy varnish coating, which seriously affect the protective performance of the coating. The number of microbubbles in the conductive composite coating decreased significantly. After salt water immersion and salt spray corrosion tests for 2000 h, the coating did not show any foaming and spalling failure, and the Q235 carbon steel under the coating did not corrode. Electrochemical impedance spectroscopy showed that with the immersion time E51 varnish coating resistance decreased sharply, while the composite coating impedance with the immersion time increases, showing some self-healing function. The resistivity and adhesion of the composite coatings were on the order of 103 Ω · cm and 9.12 MPa, respectively.