US 11,913,871 B2
Physical property evaluation method and device
Teruaki Asada, Hiroshima (JP); Tatsuya Ezaki, Hiroshima (JP); Tsutomu Shigenaga, Hiroshima (JP); and Akihide Takami, Hiroshima (JP)
Assigned to MAZDA MOTOR CORPORATION, Hiroshima (JP)
Filed by MAZDA MOTOR CORPORATION, Hiroshima (JP)
Filed on Mar. 6, 2020, as Appl. No. 16/811,380.
Claims priority of application No. 2019-107147 (JP), filed on Jun. 7, 2019; and application No. 2019-107155 (JP), filed on Jun. 7, 2019.
Prior Publication US 2020/0386667 A1, Dec. 10, 2020
Int. Cl. G01N 17/02 (2006.01); G01N 27/26 (2006.01)
CPC G01N 17/02 (2013.01) [G01N 27/26 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for evaluating a physical property of a film-shaped measurement target object by means of an electrochemical method, comprising:
a step of causing an electrolytic solution to contact a front surface of the measurement target object,
a step of arranging a first temperature adjustment section configured to adjust a front-side temperature on a front side of the measurement target object;
a step of arranging a second temperature adjustment section configured to adjust a back-side temperature on a back side of the measurement target object; and
a step of setting a set temperature of the first temperature adjustment section higher than a temperature at which condensation of moisture in the measurement target object begins, and setting a set temperature of the second temperature adjustment section lower than the temperature at which condensation of the moisture in the measurement target object begins and higher than the temperature at which condensation of liquefied water begins,
wherein the measurement target object is a coating film of a coated metal material including the coating film on a base material,
the electrolytic solution is arranged in contact with a front side of the coating film,
the second temperature adjustment section is arranged on a back side of the coating film through the base material,
the physical property is corrosion resistance of the coating film, and
a voltage is applied to between the front side and the back side of the coating film while increasing, and the corrosion resistance of the coating film is evaluated based on a voltage value upon breakdown of the coating film.