“…Thus, incorporation of foreign atoms into DLC coatings has been shown to have the potential to improve the corrosion resistance of these coatings. 15,16 However, there were many aspects restricting the improvement of corrosion resistance of DLC coatings in corrosive media. Defects such as nanopores are direct paths allowing the penetration of water, environmental oxygen and ions, and corrosive media, which would lead to the electrochemical dissolution of the substrate.…”