Device and method for monitoring corrosive environment

A method for monitoring corrosive environment based on a corrosion level of a metal film disposed inside at least one passage structure that is configured to control intrusion of a corrosive substance present in the environment into the at least one passage structure,

• the method comprising the steps of:
• measuring an electric resistance value of the metal film, wherein the electric resistance value varies depending on expansion of a corroded region of the metal film generated by the corrosive substance intruding from an opening of the passage structure;
• and
• quantifying the corrosion level of the environment based on the electric resistance value thus measured, wherein
• the metal film includes an exposed portion that is exposed to the atmosphere, the exposed portion having a rectangular shape, and
• the metal film also includes an unexposed portion that is unexposed to the atmosphere, the unexposed portion being disposed around an outer perimeter of the rectangular shape and being in direct contact with at least three different sides of the rectangular shape.