The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2019
Filed:
Jul. 22, 2013
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Kyoko Hombo, Tokyo, JP;
Kenya Ohashi, Tokyo, JP;
Masahiro Itoh, Tokyo, JP;
Mitsuharu Ikeda, Tokyo, JP;
Takeshi Fukuma, Kanazawa, JP;
Naritaka Kobayashi, Kanazawa, JP;
Shoichiro Ogata, Kanazawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The objective of the present invention is to provide a corrosion resistance evaluation method and evaluation device that make it possible to estimate crevice corrosion depth and pitting depth in a short period of time. A corrosion resistance evaluation method according to the present invention is characterized in that the surface potential of a metal under evaluation is measured in a state in which the metal is immersed in a usage-environment liquid, the surface potential distribution of the metal is determined, the surface potential differences in the microstructure of the metal are calculated on the basis of the surface potential distribution, and the corrosion rate of crevice corrosion and corrosion rate of pitting are predicted using the maximum surface potential difference from among the calculated surface potential differences as an evaluation index for corrosion evaluation.