Aluminum alloy exterior coating for underground ductile iron pipe
AssigneeMcWane, Inc.
InventorW. Harry Smith
Life of this patent
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Abstract
A corrosion resistance treatment for ductile iron pipe placed in corrosive environments provides a corrosion resistant coating from an aluminum-silicon alloy which is applied by thermal spraying or arc spraying onto the material. The alloy contains 88% aluminum and 12% silicon by weight. The aluminum provides corrosion resistance due to cathodic action and protects the pipe even when the coating is damaged. The silicon in the alloy provides greater strength to the otherwise malleable aluminum coating to resist damage to the coating during shipping, handling and installation.
Claims15
A method for providing corrosion protection and resistance to gouging for materials in a corrosive environment in the ground, said method comprising the steps of:
- a) providing an aluminum-silicon alloy having between about 5 and 15 percent silicon;
- b) providing a metallic pipe to be protected on which said aluminum-silicon alloy is to be applied;
- c) applying said aluminum-silicon alloy on said pipe to be protected from corrosion and gouging;
- d) applying a layer of bituminous material over the aluminum-silicon alloy;
- and
- e) placing the aluminum-silicon alloy protected pipe in a corrosive environment in the ground.
A method for providing corrosion protection and resistance to gouging for materials in a corrosive environment, said method comprising the steps of:
- a) providing an alloy consisting essentially of aluminum and silicon, the silicon being between 5 and 15 percent of the alloy;
- b) providing a metallic material to be protected on which said aluminum-silicon alloy is to be applied;
- c) applying said aluminum-silicon alloy on said material to be protected;
- and
- d) placing the aluminum-silicon alloy protected material underground.
A method for providing corrosion and gouging protection for materials in a corrosive environment, said method comprising the steps of:
- a) providing an alloy consisting essentially of aluminum and silicon, the aluminum being between 85 and 95 percent of the alloy;
- b) providing an iron pipe to be protected on which said aluminum-silicon alloy is to be applied;
- c) arc spraying said aluminum-silicon alloy on said iron pipe to be protected;
- and
- d) placing the aluminum-silicon alloy protected iron pipe underground.
A method for providing corrosion protection and gouging resistance for materials in a corrosive environment, said method comprising the steps of:
- a) providing an aluminum-silicon alloy having between 85 and 95 percent aluminum and between 5 and 15 percent silicon;
- b) providing an iron pipe to be protected on which said aluminum-silicon alloy is to be applied;
- c) thermal spraying said aluminum-silicon alloy on said iron pipe to be protected so as to anodize the aluminum-silicon alloy;
- and
- d) placing the aluminum-silicon alloy protected iron pipe underground.
Dependencies are inferred from the claim text.