Described herein is a composite coating on a substrate including a parylene layer deposited on a substrate surface of a substrate, a metal oxide layer covering the parylene layer, and a metal oxide, parylene hybrid layer formed between the metal oxide layer and the parylene layer.

A coating including a plurality of indicator oxide nanoparticles, a binder, and a wetting agent. A sulfidation corrosion mitigation coating including: a sulfidation corrosion mitigation material, a binder, and a plurality of indicator oxide nanoparticles. An article including a metal alloy substrate having the sulfidation corrosion mitigation coating thereon is also provided. The sulfidation corrosion mitigation coating can include a first indicator layer containing indicator oxide nanoparticles disposed on the surface of the metal alloy substrate. Methods for inspection of an article having a coating containing a plurality of indicator oxide nanoparticles is also provided.

A coating including a plurality of indicator oxide nanoparticles, a binder, and a wetting agent. A sulfidation corrosion mitigation coating including: a sulfidation corrosion mitigation material, a binder, and a plurality of indicator oxide nanoparticles. An article including a metal alloy substrate having the sulfidation corrosion mitigation coating thereon is also provided. The sulfidation corrosion mitigation coating can include a first indicator layer containing indicator oxide nanoparticles disposed on the surface of the metal alloy substrate. Methods for inspection of an article having a coating containing a plurality of indicator oxide nanoparticles is also provided.

A functional film 1 according to an embodiment includes: a substrate (10) containing an acetyl cellulose resin; a primer layer (20) containing a filler (40) and disposed on the substrate (10); and a functional layer (30) containing the filler (40) and disposed on the primer layer (20). The substrate (10) has a permeation layer (12) formed by permeation of the resin contained in the primer layer (20) into part of the substrate (10). The permeation layer (12) has a thickness of 0.1 m or more and 3.5 m or less. The primer layer (20) has a thickness of 0.1 m or more and 1.0 m or less. The filler (40) is silica particles having an average particle size of 20 nm or more and 80 nm or less. The filler (40) in the primer layer (20) has a density of or more and or less of the density of the filler (40) in the functional layer (30). The primer layer (20) and the functional layer (30) each contain a resin. The resin component of the primer layer (20) is the same as the resin component of the functional layer 30.

A structural member 10 includes a base material 100 and a protective film 200 covering a surface 110 of the base material 100. When, in a cross-section of the protective film 200 cut perpendicularly to the surface 110, a proportion of pores per unit area is defined as porosity, the porosity in a first portion 201 that is a portion of the cross-section is lower than the porosity in a second portion 202 that is a portion of the cross-section closer to the base material 100 side thereof than the first portion 201.