Corrosion resistance test method, corrosion resistance test apparatus, and corrosion resistance test program for coated metal material, and recording medium

A corrosion resistance test apparatus for a coated metal material including a metal base and a surface treatment film provided on the metal base, the apparatus comprising:

• one or two containers holding a water-containing material such that the water-containing material is in contact with the surface treatment film at a test target portion of the coated metal material;
• one electrode in contact with the water-containing material in the one container or two electrodes in contact with the respective water-containing materials in the two containers;
• an external circuit that electrically connects the electrode and the metal base to each other or the two electrodes to each other;
• a current supplier provided on the external circuit and configured to supply a current between the electrode serving as an anode and the metal base serving as a cathode or between one of the two electrodes serving as an anode and the other electrode serving as a cathode;
• a calculation unit that calculates a progress degree of corrosion of the coated metal material that has progressed due to the current supply;
• a correction unit that corrects the progress degree of the corrosion based on a posture of the test target portion;
• and
• an evaluation unit that evaluates corrosion resistance of the coated metal material based on a correction value for the progress degree of the corrosion, wherein
• the posture of the test target portion is represented by an inclination angle with respect to a reference posture of the test target portion, and
• the reference posture is a posture in which the test target portion is substantially in a horizontal direction in a state in which the coated metal material is arranged with the surface treatment film on an upper side, and
• the correction unit corrects the progress degree of the corrosion based on a correlation, which is experimentally obtained in advance, between the inclination angle and the progress degree of the corrosion, and on the inclination angle.

A non-transitory computer-readable recording medium in which a corrosion resistance test program is recorded, program for a corrosion resistance test of a coated metal material including a metal base and a surface treatment film provided on the metal base,

• the corrosion resistance test including:
• a preparation step of arranging one or two containers holding a water-containing material such that the water-containing material is in contact with the surface treatment film at a test target portion of the coated metal material and one electrode in contact with the water-containing material in the one container or two electrodes in contact with the respective water-containing materials in the two containers, and electrically connecting, through an external circuit, the electrode and the metal base to each other or the two electrodes to each other;
• a current supply step of supplying a current, with a current supplier provided on the external circuit, between the electrode serving as an anode and the metal base serving as a cathode or between one of the two electrodes serving as an anode and the other electrode serving as a cathode to cause corrosion of the coated metal material to progress;
• a calculation step of calculating a progress degree of the corrosion in the current supply step;
• a correction step of correcting the progress degree of the corrosion based on a posture of the test target portion;
• and
• an evaluation step of evaluating corrosion resistance of the coated metal material based on a correction value for the progress degree of the corrosion,
• the program causing a computer to execute a process of the correction step, wherein
• the posture of the test target portion is represented by an inclination angle with respect to a reference posture of the test target portion,
• the reference posture is a posture in which the test target portion is substantially in a horizontal direction in a state in which the coated metal material is arranged with the surface treatment film on an upper side,
• the inclination angle is measured in the preparation step, and
• in the correction step, the progress degree of the corrosion is corrected based on a correlation, which is experimentally obtained in advance, between the inclination angle and the progress degree of the corrosion, and on the inclination angle measured in the preparation step.