Optical corrosion meter

Zero resistance ammeter of metallic alloys in aqueous solutions

“…These observations of Fig. 4a and b are in agreement with interferograms documented on metallic electrodes in aqueous solutions, elsewhere [2]. It is worth mentioning that each fringe in Fig.…”

“…One of the disadvantages of using electronic instruments for the measurement of electrochemical properties is the invasive nature of those instruments to the electrochemical systems of the metallic electrodes in aqueous solutions. In recent work published elsewhere [1][2][3][4][5], it has been shown that laser optical interferometry can be used as an optical transducer to characterize the electromagnetic field, i.e., phase and amplitude of the reflected light waves of a surface of a metallic electrode moving further away from the light source, which develops as a result of the electron conduction in metallic electrodes in aqueous solutions due to the anodic reaction, corrosion processes, between the electrodes and the aqueous solutions. The characterization of such electromagnetic field (phase and amplitude of the reflected light waves of a surface) and a mathematical correlation of the electromagnetic field to any electrochemical properties, i.e., corrosion current density [1,2], double layer capacitance [3], alternating current impedance [4], and electrical resistance [5], would lead to the measurement of the electrochemical properties by optical interferometry, by the non-invasive method.…”

DL capacitance–emission spectroscopy of determining the electrochemical behavior of anodized aluminum in aqueous solutions

“…It is worth mentioning that each fringe in Fig. 2 (dark line) accounts to an orthogonal displacement equivalent to 0.3 mm according to mathematical models reported elsewhere [7,8]. In other words, holographic interferometry can be used as a powerful tool, interferometric microscope, in the field of electrochemistry.…”

“…The camera is HC-300 Thermoplastic Recorder made by Newport Corporation. For more details on the procedures of the experiment, the reader is encouraged to refer to literature elsewhere [8]. During each experiment, the holographic interferograms were recorded as a function of time, in which each test lasted for less than 60 min.…”

“…The cathodic and anodic current densities were measured electromagnetically by the optical transducer, rather than electronically by one of the classical methods, i.e., an Ammeter, of measuring the flow of the electronic current in a conductor. In addition, the optical transducer was applied to measure uniform corrosion and localized corrosion on metal surfaces and on substrates covered by organic coatings or under crevice assemblies [8][9][10][11][12][13][14]. The optical transducer was also used to document adsorption and desorption phenomena of chemical species on metal surfaces in aqueous solutions [12].…”