采用锌铝合金粉制备水性锌铝涂层，通过向涂层中添加纳米ZrO2，制备出纳米复合锌铝涂层。通过电化学测试、中性盐雾试验、扫描电镜观察、能谱分析和X射线衍射分析，研究纳米ZrO2对锌铝涂层耐蚀性能的影响。结果表明：纳米 ZrO2能增大锌铝粉活化溶解电阻，延缓锌铝合金粉的消耗，提高涂层阴极的保护周期。当纳米ZrO2的添加量为5%(质量分数)时，涂层的耐蚀性最佳，腐蚀电流密度降低至2.156×10?6 A/cm2。纳米ZrO2的添加填补了锌铝粉之间的孔隙，使涂层组织均匀致密，增强了涂层阻挡离子渗透能力，阻止涂层表面孔蚀的发生及内部微裂纹的产生，延长涂层的防护时间。
The waterborne Zn-Al coating was prepared with Zn-Al alloy powder and Zn-Al nanocomposite coating was preparedthrough addingZrO2to the as-preparedcoating. The corrosion resistance of coatings was evaluated employing electrochemical experiment, neutral salt spray test, scanning electron microscope, energy dispersive spectrometer and X-ray diffraction. The results show that the ZrO2nanoparticles can increase the active dissolution resistance and delay the consumption rate of Zn-Al powder and improve the cathodic protection period of coating. The corrosion resistance of Zn-Al nanocomposite coating isthebest when the addition of ZrO2is 5%of the mass of Zn-Al alloypowder, and the corrosion current density decreases to 2.156×10?6A/cm2. The ZrO2nanoparticles filling the gap between the Zn-Al particles improve the compactness and anti-penetrant efficiency of Zn-Al coating. The additions of ZrO2nanoparticles preventthe pitting corrosion and micro crack in the coating and prolong the protective time of coating.
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