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采用钛酸盐和锆酸盐为主盐,开发了一种应用于2024铝合金表面的无铬钛锆转化膜。通过扫描电镜(SEM)、能谱分析(EDS)、中性盐雾实验、动电位极化曲线和电化学阻抗谱对转化膜的表面形貌、成分及耐蚀性能进行了表征和分析。结果表明:制备的无铬钛锆转化膜由微米级的微小颗粒组成,膜层均匀平整,无明显缺陷;无铬钛锆转化处理后的2024铝合金,经中性盐雾168 h,无明显腐蚀产物产生;钛锆转化膜具有较低的腐蚀电流和一定的钝化能力,可有效的提高铝合金的耐蚀性能。
Using titanate and zirconate as the main salts, a chromium-free titanium-zirconium conversion coating has been developed for use on 2024 aluminum alloy surfaces. The surface morphology, composition and corrosion resistance of the conversion coating were characterized and analyzed by SEM, EDS, neutral salt spray, potentiodynamic polarization curve and electrochemical impedance spectroscopy. The results show that the prepared chromium-free titanium-zirconium conversion coating consists of micro-sized fine particles with even film formation without any obvious defects. 2024 aluminum alloy treated with chromium-free titanium-zirconium conversion has no obvious Corrosion products; titanium zirconium conversion film has a lower corrosion current and passivation capacity, which can effectively improve the corrosion resistance of aluminum alloys.