Corrosion protecting layer system, corrosion protected bearing component and method for protecting a bearing component against corrosion

Patent metadata

Field	Value
Publication number	US-11713398-B2
Application number	US-201515124863-A
Country	US
Kind code	B2
Filing date	Feb 24, 2015
Priority date	Mar 10, 2014
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

A corrosion-protecting layer system, e.g., for a bearing component used in a wind turbine, includes a base layer that contains polyurethane, zinc, and vinylphosphonic acid or silane. An intermediate layer is formed on the base layer and contains polyurethane and zinc. A top layer is formed on the intermediate layer and contains polyurethane and micaceous iron oxide. A sealing layer is formed on the top layer and contains polyurethane.

First claim

The invention claimed is:

1. A method for protecting a bearing component against corrosion, comprising:
applying and curing a first varnish based on polyurethane into which a first quantity of zinc particles have been mixed and into which either vinylphosphonic acid or silane has been mixed, to form a base layer on a surface region of the bearing component, applying and curing a second varnish based on polyurethane, to which a second quantity of zinc particles have been added, to form an intermediate layer on the base layer,
applying and curing a third varnish based on polyurethane, to which micaceous iron oxide has been added, to form a top layer on the intermediate layer, and
applying and curing a fourth varnish based on polyurethane to form a sealing layer on the top layer,
wherein, to form the intermediate layer, the second varnish is applied in a plurality of partial layers, and/or to form the top layer, the third varnish is applied in a plurality of partial layers.

2. A coating that protects against corrosion, comprising:
a base layer formed by curing a first mixture containing polyurethane, a first quantity of zinc particles, and at least one adhesion promoter selected from the group consisting of a vinylphosphonic acid and a silane,
an intermediate layer adhered to the base layer, the intermediate layer being formed by applying a second mixture containing polyurethane and a second quantity of zinc particles to the cured base layer and then curing the intermediate layer,
a top layer adhered to the intermediate layer, the top layer being formed by applying a third mixture containing polyurethane and micaceous iron oxide to the cured intermediate layer and then curing the top layer, and
a sealing layer adhered to the top layer, the sealing layer being formed by applying a fourth mixture containing polyurethane to the cured top layer and then curing the sealing layer,
wherein the intermediate layer and/or the top layer are formed from a plurality of partial layers.

3. The method according to claim 1 , wherein a reactively-crosslinking, one-component varnish is used as the first varnish, as the second varnish, as the third varnish, and as the fourth varnish.

4. The method according to claim 1 , wherein the fourth varnish contains no pigments or particulate additives.

5. The method according to claim 1 ,
wherein the first quantity of zinc particles comprises 60-90 vol % of the base layer.

6. A bearing ring formed of steel having the coating according to claim 2 adhered to at least one steel surface of the bearing ring.

7. The coating according to claim 2 , wherein the adhesion promotor is the silane.

8. A bearing component having the coating according to claim 2 formed on at least one surface region of the bearing component which surface region is not abrasively blasted.

9. A bearing having the bearing component according to claim 8 .

10. A bearing ring formed of steel having the coating according to claim 2 adhered to at least one steel surface of the bearing ring.

11. The coating according to claim 2 , wherein the adhesion promotor is the vinylphosphonic acid.

12. The coating according to claim 2 , wherein the sealing layer contains no pigments or particulate additives.

13. The coating according to claim 2 ,
wherein the first quantity of zinc particles comprises 60-90 vol % of the base layer.

14. The coating according to claim 2 ,
wherein a thickness of the coating is at least 300 μm.

15. The coating according to claim 2 ,
wherein a thickness of the coating is about 400 μm.

16. The coating according to claim 2 ,
wherein a thickness of the coating is no more than 600 μm.

Assignees

• Skf Ab

Inventors

• Von Schleinitz Thilo

Classifications

• C09D5/106 Primary

  containing Zn · CPC title

• C08G18/307

  Atmospheric humidity · CPC title

• C08G18/76

  aromatic · CPC title

• C09D175/04 Primary

  Polyurethanes · CPC title

• F16C33/201

  Composition of the plastic · CPC title