Abstract: A process of producing a tubular polymeric anticorrosion film which includes extrusion of a mixture of a thermoplastic polymer with a corrosion inhibitor in a liquid phase or with a solution thereof in a plastifying agent employed in an amount exceeding the limit of compatibility with the polymer, blowing this melt into a tubular film upon cooling, application of a layer of an enamel or a varnish incompatible with the thermoplastic polymer onto the external surface of the formed tubular film before the line of crystallization, which layer has a difference of the solubility parameters in respect of said corrosion inhibitor or a solution thereof in a plastifying agent of not more than 8.