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目前,国内鲜见导电涂层在红壤中腐蚀行为的研究报道。在高黏度的丙烯酸树脂涂料中加入溶剂、分散剂、消泡剂、增稠剂、镍粉等,制备了防腐蚀导电涂料,并在Q235钢表面制备导电涂层。通过表面接触电阻分析镍粉含量与涂层导电性的关系。将不同镍粉含量的涂层浸泡在红壤溶液中,采用电化学阻抗谱、Tafel极化曲线和光学显微镜等方法,研究了镍粉含量对导电涂层耐腐蚀性能的影响。向红壤中加入不同浓度Fe_2(SO_4)_3,研究了Fe_2(SO_4)_3含量对导电涂层耐蚀性能的影响。结果表明:镍粉含量越高,涂层的导电性越好,耐腐蚀性越差;红壤溶液中,Fe_2(SO_4)_3的含量越高,涂层的阻抗越小,耐腐蚀性越差,Fe_2(SO_4)_3会加速腐蚀反应的进行。
At present, there are few reports on corrosion behaviors of conductive coatings in red soils. Add solvent, dispersant, defoamer, thickener and nickel powder to high viscosity acrylic resin paint to prepare anticorrosive conductive coating and prepare conductive coating on Q235 steel surface. The relationship between nickel content and coating conductivity was analyzed by surface contact resistance. The coatings with different nickel content were immersed in red soil solution. The effects of nickel powder content on the corrosion resistance of conductive coatings were studied by electrochemical impedance spectroscopy, Tafel polarization curve and optical microscope. Different concentrations of Fe_2 (SO_4) _3 were added to the red soils to study the effect of Fe_2 (SO_4) _3 on corrosion resistance of the conductive coatings. The results show that the higher the nickel powder content is, the better the conductivity of the coating is and the worse the corrosion resistance. In the red soil solution, the higher the content of Fe_2 (SO_4) _3 and the smaller the resistance of the coating, the worse the corrosion resistance, Fe 2 (SO 4) 3 accelerated the corrosion reaction.