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Environmental friendly coatings for aerospace industry applications
Natural Sciences & Environment Journal (NSEJ), Volume 2, Sep 2017

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The main reason for preventing the use of chromium in surface coatings is their high ambient impact in their applications. This work aims at creation and investigation of new anticorrosion environmental friendly coating system without chromium addition. The hybrid organic-inorganic sol-gel coating was prepared by TEOS (tetraethoxysilane), titanium alcoxides and additives which provide corrosion protection for magnesium alloy. The coating exhibits excellent adhesion to the substrate and prevents corrosion attack in 5 mM sodium chloride solution for 9 days of standard immersion test. The morphology and the structure of the sol-gel coatings were characterized with SEM/EDS, TEM and AFM techniques. Corrosion behaviour of substrates treated with sol-gel derived coatings was tested by Electrochemical Impedance Spectroscopy. Different composition of sol-gel systems show enhanced protection of magnesium alloy.

Author(s): A.F. Galio, J. Kettl, I.L. Muller
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