The invention concerns a (metal/rubber) composite comprising a rubber matrix reinforced with a metal body adhering to the rubber matrix via an adhesive intermediate phase; the rubber matrix is based on diene elastomer; the metal is carbon steel whereof the carbon content ranges between 0.35 % and 1.2 %; to constitute the adhesive intermediate phase, the steel carbon is coated with a metal layer bearing aluminium oxides-hydroxides, itself coated with an organosilane film providing, as coupling agent, the bond between the aluminium oxides-hydroxides and the rubber matrix. The invention also concerns articles or semi-finished products made of rubber reinforced with or consisting of said composite, in particular tyres.