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    Preparation of self-healing hydrophobic coating on AA6061 alloy surface and its anti-corrosion property

    Year: 2019

    Journal: J. Alloy. Compd., Volume 774, FEB 5, page 495–501

    Authors: Zhang, Daquan; Yuan, Tinghui; Wei, Guoan; Wang, Hongxia; Gao, Lixin; Lin, Tong

    Organizations: NSFC project [21776172]; Science and Technology Commission of Shanghai Municipality [18DZ2204400]

    Keywords: Electric power transmission; Anti-corrosion; AA6061 alloy; Self-healing; Hydrophobic coating

    Hydrolyzed fluorinated alkyl silane (FAS) containing well-dispersed fluorinated-decyl polyhedral oligomeric silsesquioxane (FD-POSS) was used to form a thin coating layer on AA6061 alloy. Its performance was evaluated by the electrochemical measurements and surface analysis technology. The FD-POSS/FAS film shifted the corrosion potential (E-corr) of AA6061 alloy to a positive value, and suppressed significantly the anodic and cathodic corrosion reactions. Corrosion current density was decreased by one order of magnitude after FD-POSS/FAS coating treatment. The coating was hydrophobic with a water contact angle of 130 degrees. It was highly transparent and had excellent stability and reasonable adhesion with AA6061. The coating also showed a remarkable self-healing ability to auto-repair from both chemical and physical damages. This self-healing FD-POSS/FAS coating may provide an effective protection toward aluminum alloys for power transmission applications. (C) 2018 Elsevier B.V. All rights reserved.
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