Corrosion sensor and production method for the same

Patent metadata

Field	Value
Publication number	US-2019391068-A1
Application number	US-201916434423-A
Country	US
Kind code	A1
Filing date	Jun 7, 2019
Priority date	Jun 13, 2018
Publication date	Dec 26, 2019
Grant date	—

Abstract

A corrosion sensor includes an inner electrode formed of a conductive material, 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 tapered outer circumferential surface is gradually reduced as it moves toward one side in an axial direction, an outer electrode formed of a conductive material, including a cylindrical portion around the axial line and of which an inner circumferential surface is tapered, wherein a diameter of the tapered inner circumferential surface is gradually reduced as it moves toward the one side in the axial direction, and the cylindrical portion is provided such that the tapered inner circumferential surface radially faces the tapered outer circumferential surface, and an insulation layer formed of an insulation material and installed in a place across which the tapered outer circumferential surface faces the tapered inner circumferential surface.

First claim

What is claimed is:

1 . A corrosion sensor, comprising:
an inner electrode formed of a conductive material, 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 tapered outer circumferential surface of the columnar portion is gradually reduced as it moves toward one side in a direction of the axial line; an outer electrode formed of a conductive material, 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 tapered inner circumferential surface of the cylindrical portion is gradually reduced as it moves toward the one side in the direction of the axial line, and the cylindrical portion is provided such that the tapered inner circumferential surface radially faces the tapered outer circumferential surface; and an insulation layer formed of an insulation material and installed in a place across which the tapered outer circumferential surface faces the tapered inner circumferential surface.

2 . The corrosion sensor according to claim 1 ,
wherein the insulation material contains at least one of a glass material and a ceramic material.

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

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, 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 the corrosion sensor further comprises a spacer bring 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 formed to be recessed from a surface of the columnar portion on the other side in the direction of the axial line, and wherein an inner circumferential surface of the recessed portion is positioned inside the tapered outer circumferential surface in a radial direction of the columnar portion.

6 . A production method for a corrosion sensor, the method comprising:
an inner electrode preparation step of preparing an inner electrode formed of a conductive material, 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 tapered outer circumferential surface of the columnar portion is gradually reduced as it moves toward one side in a direction of the axial line; an outer electrode preparation step of preparing an outer electrode formed of a conductive material, 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 tapered inner circumferential surface is gradually reduced as it moves toward the one side in the direction of the axial line, and the cylindrical portion is provided such that the tapered inner circumferential surface radially faces the tapered outer circumferential surface of the columnar portion; an insulation material coating step of coating at least one of the tapered outer circumferential surface and the tapered inner circumferential surface with an insulation material to form an insulation film; and an assembly step of assembling together the inner electrode and the outer electrode such that the tapered outer circumferential surface and the tapered inner circumferential surface face each other, after the insulation material coating step.

7 . The production method for a corrosion sensor according to claim 6 ,
wherein the insulation material contains at least one of a glass material and a ceramic material.

8 . The production method for a corrosion sensor according to claim 6 ,
wherein in the insulation material coating step, the tapered outer circumferential surface and the tapered inner circumferential surface are respectively coated with first and second insulation materials different from each other.

9 . The production method for a corrosion sensor according to claim 6 ,
wherein the inner electrode further includes an inside flange portion protruding radially outward from the columnar portion, the outer electrode further includes an outside flange portion protruding radially outward from the cylindrical portion, and in the assembly step, the inner electrode and the outer electrode are assembled together in a state where a spacer is interposed between the inside flange portion and the outside flange portion.

10 . The production method for a corrosion sensor according to claim 9 ,
wherein outer circumferential surfaces of the inside flange portion and the outside flange portion have a circular cross section perpendicular to the axial line, and have the same outer diameter, and in the assembly step, while a guiding tool is used which has a cylindrical shape, and an inner circumferential surface of which serves as a guide surface having an inner diameter corresponding to outer diameters of the outer circumferential surfaces of the inside flange portion and the outside flange portion, and at least one of the inside flange portion and the outside flange portion is guided in the axial line direction by the guide surface, the inner electrode and the outer electrode are assembled together.

11 . The production method for a corrosion sensor according to claim 6 , further comprising:
a heating step of heating the insulation material at a temperature where the insulation material is melted after the assembly step.

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