Corrosion sensor and production method for the same

Patent metadata

Field	Value
Publication number	US-11262290-B2
Application number	US-201916434423-A
Country	US
Kind code	B2
Filing date	Jun 7, 2019
Priority date	Jun 13, 2018
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A corrosion sensor includes an inner electrode formed of a conductive material, the inner electrode including a columnar portion around an axial line as a center thereof and of which an outer circumferential surface is tapered, wherein a diameter of the outer circumferential surface decreases toward one side in an axial direction, an outer electrode formed of a conductive material, the outer electrode including a cylindrical portion around the axial line and of which an inner circumferential surface is tapered, wherein a diameter of the inner circumferential surface decreases toward the one side in the axial direction, and the cylindrical portion is positioned such that the inner circumferential surface radially faces the outer circumferential surface, and an insulation layer formed of an insulation material and in a position across which the outer circumferential surface faces the inner circumferential surface.

First claim

What is claimed is:

1. A corrosion sensor, comprising:
an inner electrode formed of a conductive material, the inner electrode including a columnar portion having a columnar shape around an axial line as a center thereof and of which an outer circumferential surface is tapered, wherein a diameter of the outer circumferential surface of the columnar portion decreases toward one side in a direction of the axial line;
an outer electrode formed of a conductive material, the outer electrode including a cylindrical portion having a cylindrical shape around the axial line as a center thereof and of which an inner circumferential surface is tapered, wherein a diameter of the inner circumferential surface of the cylindrical portion decreases toward the one side in the direction of the axial line, and the cylindrical portion is positioned such that the inner circumferential surface of the cylindrical portion radially faces the outer circumferential surface of the columnar portion;
an insulation layer formed of an insulation material and in a position across which the outer circumferential surface of the columnar portion faces the inner circumferential surface of the cylindrical portion,
wherein the insulation layer is in contact with the outer circumferential surface of the columnar portion and the inner circumferential surface of the cylindrical portion.

2. The corrosion sensor according to claim 1 ,
wherein the insulation material includes a glass material or a ceramic material.

3. The corrosion sensor according to claim 1 ,
wherein the insulation layer includes a first insulation layer on the outer circumferential surface of the columnar portion, and a second insulation layer on the inner circumferential surface of the cylindrical portion,
wherein the insulation material includes a first insulation material forming the first insulation layer and a second insulation material forming the second insulation layer, and
wherein the first insulation material differs from the second insulation material.

4. The corrosion sensor according to claim 1 ,
wherein the inner electrode further includes an inside flange portion protruding radially outward from the columnar portion,
wherein the outer electrode further includes an outside flange portion protruding radially outward from the cylindrical portion, and facing the inside flange portion from the one side in the direction of the axial line, and
wherein the corrosion sensor further comprises a spacer configured to be brought into contact with the inside flange portion and the outside flange portion.

5. The corrosion sensor according to claim 1 ,
wherein the columnar portion has a recessed portion which is recessed from a surface of the columnar portion on another side in the direction of the axial line, and
wherein an inner circumferential surface of the recessed portion is positioned inside the outer circumferential surface of the columnar portion in a radial direction of the columnar portion.

6. The corrosion sensor according to claim 1 ,
wherein the insulation material includes a glass material and a ceramic material.

7. A corrosion sensor, comprising:
an inner electrode formed of a conductive material, the inner electrode including a columnar portion having a columnar shape around an axial line as a center thereof and of which an outer circumferential surface is tapered, wherein a diameter of the outer circumferential surface of the columnar portion decreases toward one side in a direction of the axial line;
an outer electrode formed of a conductive material, the outer electrode including a cylindrical portion having a cylindrical shape around the axial line as a center thereof and of which an inner circumferential surface is tapered, wherein a diameter of the inner circumferential surface of the cylindrical portion decreases toward the one side in the direction of the axial line, and the cylindrical portion is positioned such that the inner circumferential surface of the cylindrical portion radially faces the outer circumferential surface of the columnar portion;
a first insulation layer formed of a first insulation material; and
a second insulation layer formed of a second insulation material,
wherein the first insulation layer is on the outer circumferential surface of the columnar portion and the second insulation layer is on the inner circumferential surface of the cylindrical portion, and
wherein the first insulation material differs from the second insulation material.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Mitsui Hiroyuki
• Koshiro Ikumasa
• Tagami Naoto

Classifications

• G01N27/02

  by investigating impedance · CPC title

• G01N17/04 Primary

  Corrosion probes · CPC title