# US 11,906,419 B2 · Corrosiveness prediction device and method

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- Number: US 11,906,419 B2
- Document ID: US11906419B2
- Status: Granted
- Kind: B2
- Application number: 17/604,833
- Filed: 2019-05-10
- Published: 2022-06-23
- Granted: 2024-02-20
- Earliest claimed: 2019-05-10
- Assignees: Nippon Telegraph and Telephone Corporation
- Applicants: Nippon Telegraph and Telephone Corporation
- Inventors: Shingo Mineta; Shota Oki; Mamoru Mizunuma; Masayuki Tsuda
- Web page: https://patentgrep.com/patent/US11906419B2

## CPC

- G01N 17/02: Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
- G01N 17/002: {Test chambers}
- G01N 17/006: {of metals}
- G01N 27/26: by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N 33/20: Metals
- G01N 33/24: Earth materials (G01N33/42 takes precedence)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A corrosion prediction device that predicts corrosion indicating the degree to which a metal will corrode in an environment, the device including a storage unit which stores a soil sample that simulates the environment and an electrode unit and has a function of repeatedly performing water supply and drainage with respect to the soil sample; the electrode unit including at least one type of metal pieces; a measurement unit that measures, based on change in water content in the environment in one cycle, a corrosion rate of the metal pieces or a value proportional to the corrosion rate of the metal pieces during the change; a calculation unit that integrates the corrosion rate or a value proportional to the corrosion rate over time and calculates an amount of corrosion or a value proportional to the amount of corrosion; and a prediction unit that determines a constant value of K of the power law and a constant value of n of the power law using a difference between the amounts of corrosion or the values proportional to the amounts of corrosion in different periods.

## Claims

### Claim 1

A corrosion prediction device that predicts corrosion indicating the degree to which a metal will corrode in an environment, the device comprising:
a storage unit which stores a soil sample that simulates the environment and an electrode unit and has a function of repeatedly performing water supply and drainage with respect to the soil sample;
the electrode unit including at least one type of metal;
a measurement unit that measures, based on change in water content in the environment in one cycle, a corrosion rate of the metal or a value proportional to the corrosion rate of the metal during the change;
a calculation unit that integrates the corrosion rate or a value proportional to the corrosion rate over time and calculates an amount of corrosion or a value proportional to the amount of corrosion; and
a prediction unit that determines, based on the amount of corrosion or the value proportional to the amount of corrosion and rainfall information for a predetermined period, a constant value of K of a power law and a constant value of n of the power law using a difference between the amounts of corrosion or the values proportional to the amounts of corrosion in different periods.

### Claim 2 (depends on 1)

The corrosion prediction device according to claim 1, wherein the storage unit has an environment function unit that simulates the environment to be evaluated.

### Claim 3

A corrosion predicting method executed by a corrosion prediction device that predicts corrosion indicating the degree to which a metal will corrode in an environment, the method comprising:
a measurement step in which, based on change in water content in one cycle in an environment in which at least one type of metal is disposed, a corrosion rate of the metal or a value proportional to the corrosion rate of the metal during the change is measured;
a calculation step in which the corrosion rate or a value proportional to the corrosion rate measured in the measurement step is integrated over time, and an amount of corrosion or a value proportional to the amount of corrosion is calculated; and
a prediction step in which, based on the amount of corrosion or the value proportional to the amount of corrosion and rainfall information for a predetermined period, a constant value of K of a power law is determined, and a constant value of n of the power law is determined using a difference between the amounts of corrosion or the values proportional to the amounts of corrosion in different periods.