The Preparation and Self-healing of Titanium/Zirconium/Molybdenum Conversion Coating on 6063 Aluminum Alloy
CHEN Long1, LI Wenfang1,2, ZHU Wen2
1 School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640 2 School of Mechanical Engineering, Dong Guan University of Technology, Dongguan 523000
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.
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2019, Vol. 33 
