Abstract: Certain configurations of coated articles that are corrosion resistant are described. In some embodiments, the article comprises a substrate and a corrosion resistant coating disposed on an entire surface or a portion of the surface of the substrate. The corrosion resistant coating can resist degradation after exposure to strong acids with a negative pH with a corrosion rate of less than 20 mils/year. The coating can also, if desired, exhibit a hardness of more than 600 Vickers hardness (HV), as measured based on the ASTM E92-17 standard.

Abstract: Hydraulic devices that include a moveable component configured to contact a functional fluid during movement of the hydraulic device are described. The hydraulic device can include a coating on a surface. The coating can include a metal or metal alloy such as, for example, a molybdenum or tungsten in combination with one or more other materials.

Abstract: Articles comprising a substrate and a coating are described. In some examples, the coating is disposed on at least one region of the surface and comprises at least one hydrophobic layer. In some instances, the hydrophobic layer comprises a composite comprising a single metallic element or metallic compound and at least one type of surface-modified inorganic particles to provide a metal-based matrix. In certain examples, the at least one type of surface-modified inorganic particles within the metal-based matrix is embedded within the metal-based matrix and is separate from the single metallic element or metallic compound in the metal-based matrix. Processes for producing the coatings and articles are also described.