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Binode polarization curve method for measuring electrochemical characteristic and corrosion resistance of metal

A technology of corrosion resistance and polarization curve, applied in the field of electrochemistry

Inactive Publication Date: 2007-04-25
华宏勋
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  • Application Information

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Problems solved by technology

In addition, the standard specifies the use of forward scanning and reverse scanning in the measurement, but the range of potential scanning specified in ASTM G108 is limited to the active area of ​​the metal

Method used

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  • Binode polarization curve method for measuring electrochemical characteristic and corrosion resistance of metal
  • Binode polarization curve method for measuring electrochemical characteristic and corrosion resistance of metal
  • Binode polarization curve method for measuring electrochemical characteristic and corrosion resistance of metal

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Embodiment Construction

[0034] The concrete test steps of the present invention are as follows:

[0035] (1) Instruments and equipment:

[0036] The instruments and equipment required for measurement include the electrolytic cell used for the test of electronic equipment, and the measurement equipment is shown in Figure 1. A potentiostat capable of scanning is required for potentiodynamic measurements. It must be able to automatically scan between two preset potentials at a constant speed. At the same time, the potential and current were continuously recorded using an X-Y recorder. In addition, a logarithmic converter is required to convert the current value into a logarithmic value. Some potentiostats have the ability to convert the measured current value into a logarithm and output it as a potential. This allows the measurement results to be recorded directly with the X-Y recorder.

[0037](1.1.) Potentiostat: The performance of the potentiostat used in the measurement must be such that the fl...

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Abstract

A method of binode polarization curve which is used to test the metallographic electrochemistry property and the corrosion resisting property is disclosed, The metal sample to be measured is immersed into the aqueous solution, the open-circuit potential that is the corrosion potential Ecorr of the sample is recorded, then the forward scan from the activating area to the inactivating area of the metal sample can be done beginning with the corrosion potential, the density of current which goes by the sample is be recorded at the same time; the scanning direction of electric potential is changed when the electric potential reaches the assigned value Et, the backward scan from the inactivating area to the activating area of the metal sample is started, a new corrosion potential E'corr is obtained, the anode polarization curve F of the forward scan and the anode polarization curve B of the backward scan that metal sample is in aqueous solution are run with the logarithm of electric potential and current density measured. The invention can make the measured results have perfect correlation with the true causticity of metal to gain one times information more than current technology. It will be the very effective tools for research of the metallographic electrochemistry property and the corrosion resisting property of metal in aqueous solution.

Description

technical field [0001] The invention relates to an electrochemical technique for measuring the properties and corrosion resistance of metals in aqueous solution, in particular to a dual anode polarization curve method for measuring the electrochemical properties and corrosion resistance of metals. Background technique [0002] At present, there are two standard methods for measuring the electrochemical properties and corrosion resistance of metals, one is ASTM Designation: G5-94, "Standsrd Reference Test Method for Making Potentiostatic and Potendynamic Anodic Polarization Measurements", (Annual Book of ASTM Standards, Vol. 03.02), which is a potentiostatic anodic polarization measurement method standardized by the American Society for Testing and Materials. The principle of this measurement method is to change the potential of the metal under test in an aqueous solution in a forward sweep under anodic polarization, while simultaneously recording the current flowing through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02G01N27/26
Inventor 华宏勋
Owner 华宏勋
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