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为了改善水性锌铝合金涂层的耐蚀性能,在硅烷钝化液中加入玻璃粉制备了玻璃/水性锌铝涂层,采用中性盐雾试验、电化学阻抗谱、极化曲线等方法研究了玻璃粉用量对 Q235 钢表面该涂层耐蚀性能的影响,利用扫描电镜、能谱、X 射线衍射等技术分析了涂层的形貌、组成以及元素分布状况。结果表明,添加片状玻璃粉可以提高涂层的耐蚀性能。玻璃粉与金属粉以平行叠加的方式排列在锌铝合金涂层中,部分玻璃粉包覆在涂层的外围形成致密的网状结构。当玻璃粉的添加量为 20 g/L时,涂层的耐蚀性能最好,耐中性盐雾试验时间为 3 100 h,是不添加玻璃粉涂层的 5 倍。
In order to improve the corrosion resistance of aqueous zinc-aluminum alloy coating, glass / aqueous zinc-aluminum coating was prepared by adding glass powder into the silane passivation solution. The neutral salt spray test, electrochemical impedance spectroscopy and polarization curves were used to study the corrosion resistance. The effect of glass frit dosage on the corrosion resistance of Q235 steel surface was analyzed. The morphology, composition and elemental distribution of the coating were analyzed by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The results show that the addition of flake glass powder can improve the corrosion resistance of the coating. The glass powder and the metal powder are arranged in a parallel overlapping manner in the zinc-aluminum alloy coating, part of the glass powder is coated on the periphery of the coating to form a dense network structure. When the amount of glass frit is 20 g / L, the corrosion resistance of the coating is the best, the time of neutral salt spray test is 3 100 h, which is 5 times of that of the glass powder coating.