The invention relates to a method for the surface treatment of a fluid product dispensing device. The method comprises a step in which at least one surface to be treated of at least one part of the device in contact with the fluid product is subjected to ion implantation modification using multi energy and multi charged ion beams said modified surface having properties that restrict the formation of a biofilm and consequently the appearance and/or proliferation of bacteria on the modified surface. The multi charged ions are selected from among helium boron carbon nitrogen oxygen neon argon krypton and xenon and the ion implantation is performed at a depth of between 0 and 3 µm.
