Abstract: This invention relates to a process for making a composition for the cathodic protection of metallic surfaces against corrosion and of the type comprising a binding agent and a filler in the state of particles, said filler being based on a metal more anodic than the metal to be protected, such as zinc, and on a substitute material. According to the invention, the process consists in preparing particles formed from said substitute material chosen to be electrically conductive and capable of behaving in cathodic manner with respect to the anodic metal, and provoking, by any appropriate means such as mechanical grinding, chemical coating or electro-plating, the deposit of a layer of the anodic metal on the surface of said particles of the substitute material thus forming coated cores, so that, for each core of substitute material, the thickness of the coating of anodic metal is substantially less than the diameter of the core.