US 12,235,204 B2
Corrosion amount estimation apparatus and corrosion amount estimation method
Shota Oki, Musashino (JP); Shingo Mineta, Musashino (JP); Mamoru Mizunuma, Musashino (JP); and Masayuki Tsuda, Musashino (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 17/777,156
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Nov. 19, 2019, PCT No. PCT/JP2019/045256
§ 371(c)(1), (2) Date May 16, 2022,
PCT Pub. No. WO2021/100117, PCT Pub. Date May 27, 2021.
Prior Publication US 2022/0390354 A1, Dec. 8, 2022
Int. Cl. G01N 17/02 (2006.01); G01N 17/00 (2006.01)
CPC G01N 17/02 (2013.01) [G01N 17/006 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A corrosion amount estimation apparatus that estimates a corrosion amount of a metal material buried in the ground, the apparatus comprising:
a soil adjustment unit that configured to dry a target soil;
a water permeability measurement unit configured to measure a water permeability of the soil after supplying water to the dried soil; and
a corrosion estimation unit configured to estimate the corrosion amount of the metal material when buried in the soil using the water permeability, wherein
the water permeability measurement unit measures a change time until a color of the soil completely changes to a color after wetting due to water absorption as the water permeability by image analysis, and
the corrosion estimation unit calculates a particle size of the soil using the change time, and estimates the corrosion amount of the metal material based on the particle size.