Metal corrosion-resisting testing device

Abstract

The invention discloses a test device for metal corrosion resistance, which includes a container for putting an electrolyte solution inside, and a DC power supply is installed, a part of the test piece for measuring corrosion immersed in the container maintains a certain distance from the test piece for measuring corrosion , a part of the corresponding electrode immersed in the container, and the test piece for measuring corrosion is connected to the corresponding electrode to form an anode and a cathode. On the accumulator, its electrolyte solution is 5% saline, the test piece is aluminum, and the corresponding electrode is copper, and the ion movement is generated between the aluminum reference copper electrode and the aluminum through the capillary to set the reference potential. The beneficial effect of the present invention is that in the electrolytic solution with conductivity, the metal material and the corresponding electrode are immersed, and the metal material and the electrode are connected to the anode and cathode supplied by the power supply to give a certain voltage, and the current accumulator is used to accumulate the current , using the change in potential difference between metals to measure the degree of corrosion of the metal.

Description

technical field [0001] The invention relates to a metal corrosion resistance measuring device, in particular to a metal surface forming protective film and a corresponding electrode in a NaCl electrolyte solution, when DC voltage is applied, the conductivity change of the electrolyte solution is detected and the metal corrosion degree can be measured. . Background technique [0002] Metal has good advantages in strength and processing performance, so it is mostly used in mechanical parts and electronic parts, but it also has the disadvantage of low corrosion resistance, so many researchers are studying corrosion-resistant metals and covering their surfaces with a layer of corrosion-resistant Research on the corrosion protective film, but for the corrosion resistance measurement of the protective film formed on the corrosion-resistant metal surface, the method of observing the changes of the metal surface by spraying 5% salt water on the test piece for a long time is mainly u...

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Problems solved by technology

[0002] Metal has good advantages in strength and processing performance, so it is mostly used in mechanical parts and electronic parts, but it also has the disadvantage of low corrosion resistance, so many researchers are studying corrosion-resistant metals and covering their surfaces with a layer of corrosion-resistant Research on the corrosion protective film, but for the corrosion resistance measurement of the protective film formed on the corrosion-resistant metal surface, the method of observing the changes of the metal surface by spraying 5% salt water on the test piece for a long time is mainly used. The traditional corrosion resistance test method cannot use numerical values ​​to express the corrosion degree of the test piece, and the deviation is large depending on the user, and it is difficult to judge the quality of the test piece with similar corrosion

In order to make up for this problem, the electrochemical impedance spectroscopy judged by the DC potentiometer or the frequency response signal obtained by adding the AC signal is used in the quantitative evaluation of the corrosion resistance, but the equipment investment is high, and it is still Requires certain professional knowledge

In particular, in heat exchangers installed in home appliances such as air conditioners and refrigerators, the heat release needle and the refrigerant pipe are in contact with each other, and the material of the heat release needle is mainly aluminum (Al) and the main material of the refrigerant pipe is copper (Cu). Therefore, Potential difference corrosion is caused by the potential difference between two metals, and the prediction and evaluation method of the corrosion degree has not yet been

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