Electrical contact element

1. An electrical contact element formed of a sheet metal material, comprising:

a first region;

a second region, wherein each one of the first and second regions is coated with a first coating including a first layer containing a first material having a lower standard electrode potential than the sheet metal material, wherein the first coating includes a second layer in the first region which is absent in the second region and wherein the second layer is arranged underneath the first layer and contains a second material having a lower standard electrode potential than the first material; and

a third region separated from the first region by the second region, wherein the third region is coated with a second coating comprising a first layer containing the first material, and a second layer arranged underneath the first layer and containing the second material, a third layer made of an alloy of the third material being absent in the third region.

2. The electrical contact element according to claim 1 , wherein the second region defines a distance between the first region and the third region, the distance having a value between 1 mm and 8 mm.

3. The electrical contact element according to claim 1 , wherein the first region forms at least a part of a fastening section of the electrical contact element for mechanically fastening the electrical contact element to a wire electrical cable and the second region forms at least a part of a connecting section of the electrical contact element for electrically connecting the electrical contact element to the wire electrical cable.

4. The electrical contact element according to claim 1 , wherein the sheet metal is made of copper or an alloy thereof, the first layer is made of a material having a standard electrode potential ranking between a standard electrode potential of the sheet metal material and a standard electrode potential of the wire electrical cable material, and/or the first layer is made of tin.

5. The electrical contact element according to claim 1 , wherein the second layer forms a galvanic anode made of zinc.

6. The electrical contact element according to claim 1 , wherein a hot dip tin layer is provided between the sheet metal and the first coating.

7. The electrical contact element according to claim 1 , wherein the first coating includes an additional third layer made of an alloy of a third material and the second layer is arranged between the first layer and the third layer.

8. The electrical contact element according to claim 7 , wherein the alloy of the third layer is a copper zinc alloy containing zinc in an amount of 30% to 40% by weight.

9. An electrical contact element formed of a sheet metal material, comprising:

a first region;

a second region, wherein each one of the first and second regions is coated with a first coating including a first layer containing a first material having a lower standard electrode potential than the sheet metal material, wherein the first coating includes a second layer in the first region which is absent in the second region and wherein the second layer is arranged underneath the first layer and contains a second material having a lower standard electrode potential than the first material; and

a third region separated from the first region by the second region, wherein the third region is coated with a second coating comprising a first layer containing the first material, a second layer containing the second material and a third layer made of an alloy of the third material, wherein the second layer is arranged between the first and third layers.

10. The electrical contact element according to claim 9 , wherein the second region defines a distance between the first region and the third region, the distance having a value between 1 mm and 8 mm.

11. The electrical contact element according to claim 9 , wherein the first region forms at least a part of a fastening section of the electrical contact element for mechanically fastening the electrical contact element to a wire electrical cable and the second region forms at least a part of a connecting section of the electrical contact element for electrically connecting the electrical contact element to the wire electrical cable.

12. The electrical contact element according to claim 9 , wherein the sheet metal is made of copper or an alloy thereof, the first layer is made of a material having a standard electrode potential ranking between a standard electrode potential of the sheet metal material and a standard electrode potential of the wire electrical cable material, and/or the first layer is made of tin.

13. The electrical contact element according to claim 9 , wherein the second layer forms a galvanic anode made of zinc.

14. The electrical contact element according to claim 9 , wherein a hot dip tin layer is provided between the sheet metal and the first coating.

15. The electrical contact element according to claim 9 , wherein the first coating includes an additional third layer made of an alloy of a third material and the second layer is arranged between the first layer and the third layer.

16. The electrical contact element according to claim 15 , wherein the alloy of the third layer is a copper zinc alloy containing zinc in an amount of 30% to 40% by weight.

17. An electrical contact element formed of a sheet metal material, comprising:

a first region;

a second region, wherein each one of the first and second regions is coated with a first coating including a first layer containing a first material having a lower standard electrode potential than the sheet metal material, wherein the first coating in the first and second regions includes a second layer which contains a second material having a lower standard electrode potential than the first material and which is arranged underneath the first layer and wherein the first coating further includes a third layer in the second region which is made of an alloy of a third material and arranged between the first and second layers, and wherein the third layer arranged between the first and second layers is also present in the first region; and

a third region separated from the first region by the second region, wherein the third region is coated with a second coating comprising a first layer containing the first material, a second layer arranged between the sheet metal and the first layer and containing the second material, and optionally a third layer made of the alloy of the third material and arranged between the first and second layers.

18. An electrical contact element according to claim 17 , wherein the second region defines a distance between the first region and the third region, the distance having a value between 1 mm and 8 mm.

19. The electrical contact element according to claim 17 , wherein the first region forms at least a part of a fastening section of the electrical contact element for mechanically fastening the electrical contact element to a wire electrical cable and the second region forms at least a part of a connecting section of the electrical contact element for electrically connecting the electrical contact element to the wire electrical cable.

20. The electrical contact element according to claim 17 , wherein the sheet metal is made of copper or a copper alloy, the first layer is made of a material having a standard electrode potential ranking between a standard electrode potential of the sheet metal material and a standard electrode potential of the wire electrical cable material, and/or the first layer is made of tin.

21. The electrical contact element according to claim 17 , wherein the second layer forms a galvanic anode made of zinc.

22. The electrical contact element according to claim 17 , wherein the alloy of the third layer contains copper and zinc.

23. The electrical contact element according to claim 17 , wherein the alloy of the third layer is a copper zinc alloy containing zinc in an amount of 30% to 40% by weight.

24. The electrical contact element according to claim 17 , wherein a hot dip tin layer is provided between the sheet metal and the first coating.