Corrosion estimation device and method

A corrosion estimation method comprising:

• a measurement step of measuring a water content of soil of a target land;
• a first processing step of estimating a damping function representing a temporal change in a ratio of an area wetted with water on a surface of a metal structure buried in the target land based the water content measured in the measurement step;
• a second processing step of estimating a rate increase function that increases an estimated corrosion rate of the metal structure, the rate increase function estimated based on the damping function and a thickness of a water film formed on the surface of the metal structure;
• and
• a third processing step of estimating a temporal change function of the estimated corrosion rate based on a product of the damping function and the rate increase function.

A corrosion estimation device comprising:

• a sensor configured to measure a water content of soil of a target land;
• a storage device comprising instructions;
• and
• one or more processors in communication with the storage device, wherein the one or more processors execute the instructions to:
• estimate a damping function representing a temporal change in a ratio of an area wetted with water on a surface of a metal structure buried in the target land based on the water content measured by the sensor;
• estimate a rate increase function that increases an estimated corrosion rate of the metal structure, the rate increase function being derived based on the damping function and a thickness of a water film on the surface of the metal structure;
• and
• estimate a temporal change function of the estimated corrosion rate based on a product of the damping function and the rate increase function.