Corrosion and Mechanical Properties of Diamond-like Carbon Films Deposited Inside Carbon

A new enabling technology for coating the internal surfaces of pipes with a hard, corrosion and wear resistant diamond-like-carbon (DLC) coating is described. The improvement in corrosion and wear resistance is shown based on changes in film chemistry, structure and thickness. Corrosion resistance is measured based on exposure to HCl, NaCl and H2S environments. Mechanical properties include high hardness, high adhesion, and good wear resistance in dry and wet sand slurry environments. It is suggested that this new technology enables wide spread use of DLC based coating to increase component life in applications where internal surface of pipes are exposed to corrosive and abrasive environment especially in the oil and gas industry