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Corrosion protection for aerospace aluminum alloys by Modified Self-assembled NAnophase Particle (MSNAP) sol–gel

Authors
Journal
Surface and Coatings Technology
0257-8972
Publisher
Elsevier
Publication Date
Volume
201
Identifiers
DOI: 10.1016/j.surfcoat.2006.01.028
Keywords
  • Corrosion
  • Sol–Gel
  • Electrochemical Impedance Spectroscopy (Eis)
  • Salt Spray Test
Disciplines
  • Chemistry
  • Ecology
  • Geography

Abstract

Abstract The Air Force Research Laboratory is developing environmentally benign alternatives to the traditional chromated aircraft coating for aircraft corrosion protection, targeted at a 30+ year performance life cycle. The Self-assembled NAnophase Particles (SNAP) process is a new method of forming functionalized silica nanoparticles in-situ from hydrolyzed tetramethoxysilane (TMOS) and glycidoxypropyltrimethoxysilane (GPTMS) in an aqueous sol–gel process, and then cross-linking the nanoparticles to form a thin, fully dense, protective film on Al aerospace alloys. These nanostructured coatings have been shown to provide an excellent barrier to corrosion for aluminum aerospace alloys; and other applications are envisioned. Much work has been done on characterization and performance of these coatings. This paper discusses a modification of SNAP formulation with tetraethoxysilane (TEOS). Films were formulated and developed to produce a dense barrier sol–gel coating on AA2024-T3. Corrosion protection properties of the films were evaluated with potentiodynamic scan (PDS) electrochemical technique, electrochemical impedance spectroscopy (EIS) and Salt Spray test (5% NaCl).

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