Method for the anticorrosive treatment of hollow bodies, method for producing a metallic structure treated according to said method, and method for maintaining the structure
View Patent ↗The invention involves the treatment of a hollow body having a difficult-to-access surface to be preserved from corrosion by injecting a cellular foam supporting an anti-corrosion agent into the hollow body. Also involved is the production of a metal structure by assembling the structure and then applying an anti-corrosion treatment to the difficult-to-access surfaces of the structure. The invention is particularly applicable to railway wagons.
1. A method for maintaining a metal structure, comprising:
replacing a part of the metal structure,
wherein the metal structure comprises
at least one hollow body and
at least one inflammable element;
injecting a cellular foam into the hollow body,
wherein the cellular foam comprises at least one of
an anti-corrosion agent,
a fire retardant, and
a thermal insulator,
wherein the cellular foam is a non-inflammable thermal barrier,
wherein the inflammable element is separated from the part by the cellular foam; and
replacing the part directly without prior removal of the inflammable element.
2. The method according to claim 1 , wherein the cellular foam is produced by injectinq a mixture of a first component for the expansion of a second component supporting the anti-corrosion agent and the fire retardant or the thermal insulator.
3. The method according to claim 1 , wherein the cellular foam includes at least one pigment.
4. The method according to claim 1 , wherein the cellular foam supports an acoustic insulator.
5. The method according to claim 1 , wherein the cellular foam supports an impermeable elastic agent.
6. The method according to one of claims 1 , wherein the cellular foam includes a filling product.
7. The method according to claim 6 , wherein the filling product is hemp.
8. The method of maintenance according to claim 1 , wherein said part is flame cut and replaced by another part which is welded to the structure.