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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2019, Vol. 40 ›› Issue (11): 422967-422967.doi: 10.7527/S1000-6893.2019.22967

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Effects of pulse frequency on MAO coatings of AA7050

ZONG Yu1,2, SONG Renguo1,2, HUA Tianshun1,2, CAI Siwei1,2, WANG Chao1,2, LI Hai1,2   

  1. 1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;
    2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China
  • Received:2019-02-25 Revised:2019-03-18 Online:2019-12-03 Published:2019-08-05
  • Supported by:
    National Natural Science Foundation of China (51871031)

Abstract: The Micro-Arc Oxidation(MAO) ceramic coatings were prepared at the pulse frequencies of 50, 250, 500, 750, 1 000 Hz on the 7050 high strength aluminum alloy. To analyze the surface morphology, phase composition, corrosion resistance and wear resistance of ceramic coatings, the Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), electrochemical workstation, friction-abrasion tester were used. The results showed that when the pulse frequency was too low, the surface of MAO ceramic coating would be rough, which affected the compactness of the coating. When the pulse frequency was too high, it would be unfavorable to the growth of MAO ceramic coating, and the corrosion resistance and wear resistance of the as-prepared coatings were poor. When the pulse frequency was 250 Hz, the coating was of the best wear resistance and corrosion resistance.

Key words: 7050 high strength aluminum alloy, micro-arc oxidation, pulse frequency, ceramic coating, wear resistance, corrosion resistance

CLC Number: