6063铝合金表面钛/锆/钼转化膜的制备及自愈性

doi:10.11896/cldb.18020008

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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.

Key words： 6063 aluminum alloy titanium/zirconium/molybdenum conversion coating corrosion resistance self-healing

Published: 16 May 2019

CLC number:

TG178

Fund:This work was financially supported by Science and Technology Planning Project of Guangdong Province of China (2017A010103033)

About author:: Long Chen is a postgraduate student. He is studying at the School of Materials Science and Engineering, South China University of Technology. He is focusing on corrosion resistance and chemical conversion coatings of magnesium and aluminum alloys.
Wenfang Li, professor, PhD supervisor, Standing Director of Conversion Film Committee of China Surface Engineering Society, Director of China Composite Material Society, Member of Composite Material Expert Group of China Mechanics Society, etc. He has been engaged in scientific research and teac-hing in the field of material science and engineering. He has applied for or authorized more than 20 patents and published nearly 200 papers in scientific and technological journals. The research directions are metal matrix composites, corrosion and protection treatment of Mg-Al alloy and strengthening and toughening of Mg-Al alloy.

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Cite this article:

CHEN Long,LI Wenfang,ZHU Wen. The Preparation and Self-healing of Titanium/Zirconium/Molybdenum Conversion Coating on 6063 Aluminum Alloy[J]. Materials Reports, 2019, 33(10): 1691-1696.

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http://www.mater-rep.com/EN/10.11896/cldb.18020008 OR http://www.mater-rep.com/EN/Y2019/V33/I10/1691

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