(南京航空航天大学 材料科学与技术学院，南京 211106)
摘 要: 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。
关键字: ZrO2;锌铝涂层;纳米复合涂层;耐蚀性
（College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China）
Abstract:The waterborne Zn-Al coating was prepared with Zn-Al alloy powder and Zn-Al nanocomposite coating was prepared through adding ZrO2 to the as-prepared coating. 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 ZrO2 nanoparticles 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 is the best when the addition of ZrO2 is 5% of the mass of Zn-Al alloy powder, and the corrosion current density decreases to 2.156×10-6 A/cm2. The ZrO2 nanoparticles filling the gap between the Zn-Al particles improve the compactness and anti-penetrant efficiency of Zn-Al coating. The additions of ZrO2 nanoparticles prevent the pitting corrosion and micro crack in the coating and prolong the protective time of coating.
Key words: ZrO2; Zn-Al coating; nanocomposite coating; corrosion resistance
