Patent ID: 8377531

Claim:
A method for protecting a tank, container, pipeline, semi-closed system or closed system comprising the steps of: (A) placing a vapor phase corrosion inhibiting device in a lid, cap, cover, or hatch in communication with a tank, container, pipeline, semi-closed system or closed system; wherein the vapor phase corrosion inhibiting device comprises; a capsule having at least one sealable enclosure therein; at least one biodegradable polymer layer which contains therein at least one vapor phase corrosion inhibitor, which is located within the sealable enclosure of the capsule; and at least one degradable layer which contains no vapor phase corrosion inhibitor_therein which is located within the sealable enclosure of the capsule; wherein the at least one degradable layer which contains at least one vapor phase corrosion inhibitor and the at least one degradable layer which contains no vapor phase corrosion inhibitor are formed in alternating layers with the proviso that at least one degradable layer which contains no vapor phase corrosion inhibitor is the outermost layer within the corrosion inhibiting device; and (B) closing car sealing the tank, container, pipeline, semi-closed system or closed system.