Earth bolt containing surface treatment layer and method of surface treatment of earth bolt

Patent metadata

Field	Value
Publication number	US-9771965-B2
Application number	US-201414482540-A
Country	US
Kind code	B2
Filing date	Sep 10, 2014
Priority date	Dec 19, 2013
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

An earth bolt with a surface treatment layer are a method of surface treatment of the earth bolt are provided. The surface treatment includes a tin-zinc plated layer, a colored chromate film layer and a silicate coating layer. Since the earth bolt with the surface treatment layer has improved electro-conductivity and anti-rusting property, it may protect electrical/electronic components fitted to a vehicle from electromagnetic shock and remove noise therefrom, thereby improving reliability of a vehicle body.

First claim

What is claimed is:

1. An earth bolt with a surface treatment layer including a plated layer, comprising:
a tin-zinc plated layer;
a colored chromate film layer; and
a silicate coating layer,
wherein the tin-zinc plated layer is formed by plating with a plating solution containing tin of about 70 wt % or greater based on the total weight of the tin-zinc plating solution.

2. The earth bolt with the surface treatment layer according to claim 1 , wherein the surface treatment layer has a sequentially laminated structure of a tin-zinc plated layer, a colored chromate film layer and a silicate coating layer from the surface of the earth bolt.

3. The earth bolt with the surface treatment layer according to claim 1 , wherein the tin-zinc plated layer has a thickness of about 8 to 12 μm.

4. The earth bolt with the surface treatment layer according to claim 1 , wherein the colored chromate film layer has a thickness of about 1 μm or less.

5. The earth bolt with the surface treatment layer according to claim 1 , wherein the silicate coating layer has a thickness of about 1 μm or less.

6. A method for the surface treatment of an earth bolt, comprising:
plating an earth bolt with a plating solution containing tin of about 70 wt % or greater based on the total weight of the tin-zinc plating solution, to form a tin-zinc plated layer;
forming a film on the tin-zinc plated layer using a solution including chromic acid or dichromate, to form a colored chromate film layer; and
applying a silicate solution on the colored chromate film layer, to form a silicate coating layer.

7. The method for the surface treatment according to claim 6 , wherein the tin-zinc plated layer has a thickness of about 8 to 12 μm.

8. The method for the surface treatment according to claim 6 , wherein the colored chromate film layer has a thickness of about 1 μm or less.

9. The method for the surface treatment according to claim 6 , wherein the silicate coating layer has a thickness of about 1 μm or less.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Sim Gyu Man

Classifications

• F16B33/06

  Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure {or fretting (corrosion preventing means F16B33/008; settable coatings for locking threaded members F16B39/225; deformable coatings for locking threaded members F16B39/34)} · CPC title

• C23C22/24

  containing hexavalent chromium compounds · CPC title

• C25D3/60

  containing more than 50% by weight of tin · CPC title

• B32B9/00

  Layered products comprising a {layer of a} particular substance not covered by groups B32B11/00 - B32B29/00 · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title