Patent ID: 9121540
Filing Date: 2015-09-01
Classification: B05D,C09D,C23C,E21B,F16L,H01J,Y10T

Abstract:
1. A method of depositing a conformal coating comprising: creating a vacuum within an interior volume of a tubular structure, wherein said tubular structure includes an iron based internal surface and said interior volume; introducing an inert gas and optionally hydrogen and sputter cleaning said iron based internal surface; directly following said sputter cleaning supplying gas to said interior volume of said tubular structure, wherein said gas includes a plasma precursor in the gas phase; biasing said tubular structure relative to ground; forming a plasma having a density and cyclically positioning said plasma density along the length of said tubular structure; generating positive ions of said plasma precursor gas which are deposited on said internal surface; and forming a coating having a surface on said internal surface, wherein said coating exhibits a water contact angle of greater than 120° and said coating comprises 50 to 60 atomic percent carbon, 20 to 30 atomic percent oxygen and 15-25 atomic percent silicon, and said atomic percents of carbon, oxygen and silicon are present at the surface of said coating and at a depth of up to 300 Angstroms into said coating and wherein said coating mitigates the nucleation, growth and adhesion of asphaltenes waxes and gas hydrates.