Protective coatings for aircraft engine components

An aircraft engine component, comprising:

• a wall comprising an aluminum alloy and/or a magnesium alloy;
• and
• a protective coating at least partially covering a surface of the wall, the protective coating comprising:
• a prime layer at least partially covering the surface of the wall, the prime layer comprising a silane coupling agent and an organic titanate;
• a silicone elastomer layer at least partially covering the prime layer, the silicone elastomer layer comprising one or more filler materials dispersed in a matrix of cross-linked silicone polymers, wherein the silicone elastomer layer has a density of 0.2 g/cm3 to 0.6 g/cm3 and a Shore A hardness, when cured, of 30 to 80 according to ASTM D2240-15e1;
• and
• an abrasion resistant layer at least partially covering the silicone elastomer layer, the abrasion resistant layer comprising a fiber-reinforced elastomeric material, wherein the abrasion resistant layer has a density of 0.9 g/cm3 to about 1.4 g/cm3 and a Shore A hardness, when cured, of 40 to 90 according to ASTM D2240-15e1.