| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for evaluating water vapor permeability, capable of accurately and rapidly carrying out evaluating a slight amount of water vapor permeation, measuring moisture permeability and evaluating the in-plane distribution of structural defects, causing the water vapor permeation, which cannot be carried out by conventional methods, by using a simple test piece on which metallic corrosion is applied. SOLUTION: In the method for evaluating the water vapor permeability, a metallic corrosion test piece is kept under a humidity environment, which is made up by forming a corrosive metal capable of being corroded, in reaction to moisture, on one surface side of a solid substrate composed of a material having water vapor permeability to be evaluated. Then, an image of the metallic corrosion test piece is photographed, where a portion of the corrosive metal is corroded by water vapor permeating through the solid substrate; a corrosion state of the metal reacting to the moisture is evaluated, by using an image processing means which processes the photographed image; and the water vapor permeability of the solid substrate is evaluated from the shape, distribution and/or area of corroded regions. COPYRIGHT: (C)2005,JPO&NCIPI
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