Chemistry: analytical and immunological testing – Process or composition for determination of physical state... – Corrosion resistance or power
Patent
1987-01-09
1989-01-24
Richman, Barry S.
Chemistry: analytical and immunological testing
Process or composition for determination of physical state...
Corrosion resistance or power
422 53, 201 1, 324 65CR, G01N 1700, G01N 3100, G01R 2702
Patent
active
048001651
ABSTRACT:
A method of detecting the rate of corrosion of an existing steel structure installed in a corrosive environment is disclosed. The method includes treating a measurement surface of the member so that an AC impedance of the measurement surface, when electrochemically measured at a predetermined high frequency range of potential variation applied to the measured surface, takes a first valve within a predetermined range; and second value of the impedance is then electrochemically measured at a low frequency range of potential variation applied thereto. The difference between the first and second values is calculated to detect the corrosion-reaction resistance of the surface and the rate of corrosion is determined on the basis of the detected corrosion-reaction resistance and according to a pre-calculated relation between the rate of corrosion and the corrosion-reaction resistance.
REFERENCES:
patent: 4238298 (1980-12-01), Tsuru et al.
patent: 4667150 (1987-05-01), Hausler et al.
Zen et al., Technical Note of The Port and Harbor Research Institute Ministry of Transportation, Japan, Mar. 1982, p. 5.
Ito Satoshi
Kihira Hiroshi
Matsuoka Kazumi
Oka Tomoki
Alfandary-Alexander Lyle
Nippon Steel Corporation
Richman Barry S.
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