Electric cable with corrosion resistant armor

Patent metadata

Field	Value
Publication number	US-10692626-B2
Application number	US-201515775407-A
Country	US
Kind code	B2
Filing date	Nov 13, 2015
Priority date	Nov 13, 2015
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

An electric cable ( 10 ) is disclosed comprising a) at least one cable core ( 11 ) comprising at least one power transmissive insulated element ( 12 ); and b) a metallic outer armor ( 19 ) containing the cable core ( 11 ); wherein the outer armor ( 19 ) comprises a carbon steel tape ( 20 ) wound according to helical interlocked windings, the tape ( 20 ) being coated with an aluminum coating layer ( 22 ) having a thickness equal to or lower than 50 μm. Furthermore, a process for manufacturing such an electric cable is disclosed.

First claim

The invention claimed is:

1. An electric cable comprising:
a cable core comprising a power transmissive insulated element; and
a metallic outer armor containing the cable core;
wherein the outer armor comprises a carbon steel tape wound according to helical interlocked windings, the tape being coated with an aluminum coating layer comprising aluminum and having a thickness ranging from 20 μm to 45 μm, and
wherein the cable further comprises a Fe—Al—Si intermetallic compound at an interface between the steel tape and the aluminum coating layer, the intermetallic compound being included within an interface layer having a thickness of 2 μm to 7 μm and having the formula:
Al x SiFe y

wherein x is a number of 3 to 7 and y is a number of 1 to 3.

2. The electric cable according to claim 1 , comprising an Al—Fe intermetallic compound at said interface between the steel tape and the aluminum coating layer.

3. The electric cable according to claim 1 , wherein the aluminum coating layer of the carbon steel tape of the outer armor comprises silicon.

4. The electric cable according to claim 3 , wherein the aluminum coating layer comprises from 5 to 15% by weight of Si based on a total weight of the aluminum coating layer.

5. The electric cable according to claim 1 , wherein the Fe—Al—Si intermetallic compound has the formula:
Al 5.3 SiFe 1.5 .

6. The electric cable according to claim 1 , wherein the carbon steel tape has a thickness of 550 μm to 750 μm.

7. An electric cable comprising:
a cable core comprising a power transmissive insulated element; and
a metallic outer armor containing the cable core;
wherein the outer armor comprises a carbon steel tape wound according to helical interlocked windings, the tape being coated with an aluminum coating layer comprising aluminum and having a thickness ranging from 20 μm to 45 μm and wherein a Fe—Al—Si intermetallic compound exists at an interface between the steel tape and the aluminum coating layer, wherein the Fe—Al—Si intermetallic compound has the formula:
Al x SiFe y

wherein x is a number of 3 to 7 and y is a number of 1 to 3.

8. The electric cable according to claim 7 , wherein the aluminum coating layer of the carbon steel tape of the outer armor comprises silicon.

9. The electric cable according to claim 8 , wherein the aluminum coating layer comprises from 5 to 15% by weight of Si based on a total weight of the aluminum coating layer.

10. The electric cable according to claim 7 , wherein the Fe—Al—Si intermetallic compound has the formula:
Al 5.3 SiFe 1.5 .

11. The electric cable according to claim 7 , wherein the carbon steel tape has a thickness of 550 μm to 750 μm.

Assignees

• Prysmian Spa

Inventors

• Fallahmohammadi Ehsan
• Casiraghi Flavio

Classifications

• H01B7/046 Primary

  attached to objects sunk in bore holes, e.g. well drilling means, well pumps · CPC title

• H01B7/226

  Helicoidally wound metal wires or tapes · CPC title

• C23C2/38

  Wires; Tubes · CPC title

• H01B7/2806

  Protection against damage caused by corrosion · CPC title

• C23C2/12

  Aluminium or alloys based thereon · CPC title