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接地网是变电站重要的安全防护设备,腐蚀是其服役中的最主要限制因素.为研究Q235接地网材料沉积NiP、DLC涂层之后的抗腐蚀性能,采用化学镀及阳极离子源物理沉积的方法在Q235基体上沉积2种涂层.采用扫描电镜以及拉曼光谱分析沉积涂层之后,分别在3.5%的NaCl溶液中测定3种材料极化曲线以及电化学阻抗谱,电化学试验之后样品采用扫描电镜对比3种材料试验后表面情况.极化曲线测试以及阻抗谱拟合分析均表明,2种涂层相对于Q235具有更小的自腐蚀电流密度,更高的电阻.同时电化学腐蚀后形貌表明Q235表面完全为腐蚀产物覆盖说明表面被完全破坏,而2种涂层的表面只是部分区域产生腐蚀坑.
Grounding network is an important safety equipment in substation and corrosion is the most important factor in the service.In order to study the corrosion resistance of Q235 grounding network material after deposition of NiP and DLC coating, the method of electroless plating and physical deposition of anode ion source Two kinds of coatings were deposited on the Q235 substrate.The polarization curves and electrochemical impedance spectra of the three materials were measured in 3.5% NaCl solution after the coatings were analyzed by scanning electron microscopy and Raman spectroscopy. The samples were taken after electrochemical test Scanning electron microscope (SEM) was used to compare the surface conditions of the three materials tested.Polarization curve analysis and impedance spectrum fitting analysis showed that the two coatings have a smaller self-corrosion current density and higher resistance than Q235.At the same time, electrochemical corrosion The morphology shows that the surface of Q235 completely covered with corrosion products shows that the surface is completely destroyed, while the surface of the two kinds of coatings only produces corrosion pits in some areas.