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. 2018 Jan 26;11(2):197. doi: 10.3390/ma11020197

Table 2.

A summary of the types of coating materials.

Type of Layer	Key Features	Examples
Inert Layers	Low porosity	SiO₂ [1], ZrO₂ [5,43], Al₂O₃ [43], TiO₂ [43]
	Substrate adhesion
	Reduced roughness
Gradient Layers	Low porosity	Oxide matrices with GPTMS [6]/VETO [49]/PMMA [37] doped by corrosion inhibitors [7,8,46,49], nanostructures [1,6,12,45] or nanocontainers [37]
	Crack resistance
	Inhibition of corrosion
Surface Layers	Low porosity	ZrO₂ [1,10], SiO₂-GPTMS-VETO doped by cerium nitrate [49]
Surface Layers	Mechanical resistance	ZrO₂ [1,10], SiO₂-GPTMS-VETO doped by cerium nitrate [49]