【摘要】 采用化学转化处理法在6063铝合金表面制备获得淡黄色的钛/锆/钼转化膜,通过浸泡法并借助电化学工作站考察了钛/锆/钼转化膜的耐蚀性,采用划痕法结合扫描电子显微镜（SEM）研究了钛/锆/钼转化膜的自愈性。转化液的组成为:2 g/L H₂TiF₆,2 g/L H₂ZrF₆,2 g/L有机酸着色剂,3 g/L Na₂MoO₄。结果表明,在pH=3.0、温度为35℃、时间为5 min的工艺条件下能够在6063铝合金表面获得淡黄色、致密且耐蚀性良好的膜层,膜层微观表面均匀分布着白色颗粒和裂纹。人工划痕的钛/锆/钼转化膜在3.5%NaCl盐雾氛围中随着浸泡时间的延长划痕逐渐愈合,形成新的膜层,这表明制得的膜层具有自愈性。当在中性盐雾中的腐蚀时间超过5 d后,划痕处附近膜层中的氧化剂不断被消耗,迁移至划痕处发生络合的物质逐渐减少,膜层自愈性能退化,膜层被腐蚀。更多还原

【Abstract】 Ayellowish titanium/zirconium/molybdenum conversion coating（TZMCC） was successfully prepared on the 6063 aluminum alloy by the chemical conversion treatment. The corrosion resistance of TZMCC was investigated by immersion method and electrochemical workstation. The self-healing property of the coating was characterized by means of scarification and scanning electron microscope（SEM）. The compositions of the conversion solution are 2 g/L of H₂TiF₆, 2 g/L of H₂ZrF₆, 2 g/L of organic acid colorants, 3 g/L of Na₂MoO₄. The results showed that a yellowish and compact TZMCC with several uniform cracks and good corrosion resistance was obtained under pH=3.0, at 35 ℃ for 5 min. The artificial scratch on the TZMCC was gradually healed with the increase of the soaking time in the atmosphere of 3.5% NaCl solution, indicating that the TZMCC has self-healing performance. When the corrosion time of the neutral salt spray was more than 5 d, the oxidizing agent in the coating near the scratch was constantly consumed, and the complex compounds transferred to the scratch was gradually reduced, the self-healing power of the coating was decreased and the TZMCC was corroded.更多还原