Parylene-in-Oil Hydrophobic Coating

A method of producing a coating that bestows corrosion-resistance to a surface, the method comprising:

• providing a surface to be protected;
• applying a film of liquid oil to the surface, the film having a thickness less-than-or-equal-to 10 microns (μm);
• depositing, by chemical vapor deposition (CVD) in a vacuum chamber, parylene over the oil film, the deposited parylene growing dendrites from the surface, at the bottom of the oil film, through the oil to a top of the oil film;
• and
• laying, by further CVD, a solid layer of parylene on top of the oil film and dendrites, the solid layer integrally connecting with the dendrites.

A method of producing a fluid-repellant, biofouling-resistant surface, the method comprising:

• providing a device having a conformal coating of parylene;
• applying a film of liquid oil to a surface of the coating, the film having a thickness less-than-or-equal-to 10 microns (μm);
• growing, by chemical vapor deposition (CVD) in a vacuum chamber, parylene dendrites from the surface, through the oil, to a top of the film;
• forming, by further CVD, a solid layer of parylene on top of the oil film, the solid layer integrally connected with the dendrites;
• and
• treating, with oxygen plasma, the solid layer sufficient to ablate the solid layer away and expose tops of the parylene dendrites.