Plasma enhanced chemical vapor deposition coating technology provides a green alternative for bonding or over molding metal components. Surface preparation of metal components prior to bonding incompatible materials may require caustic chemical etchants or other costly conversion coatings to ensure good bonding to the base metal substrate. By depositing a thin polymerized coating, it is possible to create a tie or interface layer which permits direct bonding or over molding to the metal surface. Plasma polymerized films can be deposited directly onto a plasma pre-cleaned substrate without exposure to the atmosphere. This continuous process provides excellent adhesion to the base substrate.