Enhanced Protective and Mechanical Properties of Polypyrrole Coatings Modified by Silane/CoO Nanocomposite on AZ91 Mg Alloy in Chloride Media

Effects of newly synthesized nanocomposites containing multifunctionalized silicon nitride nanoparticles: A study on structural, thermal, electrochemical, mechanical, morphological, water repellent properties for aerospace components

“…This is due to the exposure of bare AA7055 aluminum alloy surface through pores/defects in the PU coating. Hence, the EIS investigation of the PU‐BAPOD/Si 3 N 4 coated AA7055 alloy showed the superior anticorrosive behavior, even after prolonged exposure to chloride environment in comparison with PU coated AA7055 aluminum alloy 36,37 …”

“…Hence, the EIS investigation of the PU-BAPOD/Si 3 N 4 coated AA7055 alloy showed the superior anticorrosive behavior, even after prolonged exposure to chloride environment in comparison with PU coated AA7055 aluminum alloy. 36,37 The corrosive ions could easily penetrate into the aluminum alloy specimens and forms more corrosion products compared with coated specimens. Whereas, the E corr and i corr values of pure PU coated aluminum alloy at 1 day are found to be À445 mV and 6.20 μA/cm 2 .…”

Innovative Nanocomposite Coating for Aluminum Alloy in the Aircraft Manufacturing Industry with Increased Mechanical Strength, Flame Retardancy, and Corrosion Resistance

“…Enhancing the barrier properties and anti-corrosion capabilities of polymer coatings often involves adding appropriate anticorrosion fillers. [16][17][18][19][20][21][22][23][24][25] Polyurethane (PU) coatings offer several significant advantages over conventional coatings like nickel (Ni) coating, chemical conversion films, and plating metal layers: (i) Flexibility and Durability: PU coatings are highly flexible, preventing cracks and extending the life of the coating under mechanical stress; (ii) Chemical Resistance: PU coatings provide excellent resistance to chemicals, oils, and fuels, essential for aircraft exposed to various substances; (iii) Environmental Compliance: PU coatings can be formulated to meet stringent environmental regulations, reducing volatile organic compound (VOC) emissions; (iv) Weight Reduction: PU coatings add less weight to aircraft, beneficial for fuel efficiency and performance; (v) Enhanced Adhesion and Flexibility: PU coatings adhere better to various substrates and can flex without cracking, unlike some metal-based coatings; (vi) Simplified Application Process: PU coatings can often be applied using simpler and more versatile methods, reducing application time and cost. Recent research focuses on enhancing PU properties by incorporating 2D layered nanocomposites, particularly graphitic carbon nitride (GCN) and silanized tantalum nitride (TaN) nanoparticles.…”

“…However, pure polymer coatings often have micropores, leading to poor corrosion resistance as aggressive ions diffuse through these pores, degrading the coating and its protective capabilities. Enhancing the barrier properties and anti‐corrosion capabilities of polymer coatings often involves adding appropriate anti‐corrosion fillers [16–25] …”