CN105277598A - Testing device and testing method for thickness of oxide film of copper rod for electrician - Google Patents

Abstract

The invention provides a device for testing the oxide film thickness of a copper rod for electricians, which includes a DC current source, a data recording and processing system, and an electrolytic cell containing an electrolyte, and the electrolytic cell is provided with a copper rod made of a copper rod for electricians. A cathode and an anode made of inert metal, the lower end of the cathode and the lower end of the anode are immersed in the electrolyte, the two ends of the direct current source are respectively connected to the cathode and the anode, and the cathode is connected to the data recording and processing system connected. The test device is used to detect the thickness of the oxide film on the surface of the electrical copper rod. The test operation is very convenient and fast, and can accurately measure the thickness of the oxide film, so the measurement accuracy is high. A strong case.

Description

Copper Rod Oxide Film Thickness Test Device and Test Method for Electrician

technical field

The invention relates to the field of detection of oxide film thickness on the surface of copper rods for electricians, in particular to an oxide film thickness tester and method for copper rods for electricians.

Background technique

Copper rods for electricians refer to round copper rods that meet the GB3952 standard, which have a relatively high copper content and are used for drawing wires and cables and enameled wires. Copper rods for electricians have been stacked in the air in the early stage of the production process, so the copper rods will oxidize with the oxygen in the air, and then form an oxide film on the surface of the copper rods. The composition of the oxide film is copper oxide and Cuprous oxide. Practical research shows that the thickness of the oxide film will have varying degrees of influence on the surface quality of the copper rod and the subsequent processing performance of the copper rod. If the thickness of the oxide film is too large, the surface of the copper rod will be blackened, which will seriously affect the surface quality of the copper rod. It will adversely affect the subsequent processing of copper rods such as wire drawing, tinning, and painting. Therefore, it is very necessary to measure the thickness of the oxide film on the surface of the copper rod before the copper rod enters production.

At present, the existing methods for measuring the oxide film thickness of copper rods for electrical purposes in China generally judge the thickness of the oxide film by measuring the weight of copper powder after twisting the copper rods for electrical purposes. However, this measurement method cannot be direct and accurate. The thickness of the oxide film can only be qualitatively determined by the amount of copper powder, the test accuracy is very low, and the result is inaccurate, so it cannot be effectively used for the measurement of the oxide film thickness. At the same time, this method is cumbersome to operate, and it is necessary to wrap the two ends of the copper rod to be tested with adhesive tape. However, during the measurement process, the adhesive tape needs to be pressed tightly by the fixture, which is easy to crack, thereby scratching the surface of the copper rod, and easily causing copper powder. The increase of the amount will affect the measurement accuracy of the oxide film thickness.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a copper rod oxide film thickness testing device for electricians that is easy to operate and has high measurement accuracy.

In order to achieve the above object, the present invention provides a copper rod oxide film thickness testing device for electricians, including a DC current source, a data recording and processing system, and an electrolytic cell containing an electrolyte. A cathode made of a copper rod and an anode made of an inert metal, the lower end of the cathode and the lower end of the anode are immersed in the electrolyte, the two ends of the direct current source are respectively connected with the cathode and the anode, and the cathode Connected to the data record processing system.

Further, a fuel gauge is also included, the fuel gauge is respectively connected with the DC current source and the data recording and processing system, and is used for measuring the magnitude of the current output by the DC current source and transmitting the magnitude of the current to the data recording and processing system.

Preferably, the electrolytic cell is also provided with a reference electrode immersed in the electrolyte, and the reference electrode is connected with the data recording and processing system.

As mentioned above, the copper rod oxide film thickness testing device for electrician related to the present invention has the following beneficial effects:

The test device is used to detect the thickness of the oxide film on the surface of the electrical copper rod. The test operation is very convenient and fast, and can accurately measure the thickness of the oxide film, so the measurement accuracy is high. A strong case.

Another object of the present invention is to provide a method for measuring the oxide film thickness of copper rods for electricians, which is easy to operate and has high measurement accuracy.

In order to achieve the above object, the present invention provides a method for testing the oxide film thickness of copper rods for electricians, which comprises the following steps in turn:

1), cut a section of copper rod from the straightened electrician copper rod as a copper rod sample;

2), the copper rod sample is loaded into the electrolytic cell as the cathode, and an anode made of an inert metal is also provided in the electrolytic cell, and the lower end of the cathode and the lower end of the anode are immersed in the electrolyte contained in the electrolytic cell middle;

3), connecting the anode and the cathode to both ends of a direct current source, and simultaneously connecting the cathode to a data recording and processing system;

4), connect the DC current source, start the test, then the data recording processing system automatically records the reduction reaction time t1 of the cuprous oxide on the surface of the cathode and the reduction reaction time t2 of the copper oxide;

5), the thickness T1 of cuprous oxide is $T1=\frac{I*t1*m1}{S*d1*f*\mathrm{no}},$ The thickness T2 of copper oxide is $T1=\frac{I*t2*m2}{S*d2*f*\mathrm{no}};$

In the above formula: I is the current value (A);

M1, M2 are respectively the molecular weight (g/mol) of cuprous oxide and cupric oxide;

S is the area of the cathode immersed in the electrolyte (cm ² );

d1 and d2 are the densities (g/cm ³ ) of cuprous oxide and copper oxide respectively;

F is Faraday's constant, F=96500C/mol;

n is a hydrogen equivalent, n=2;

6) The thickness of the oxide film on the copper rod for electrician is T=T1+T2.

Preferably, the electrolyte is 0.1 mol sodium carbonate solution.

Further, the material of the anode is platinum wire.

Preferably, the length of the cathode is 150-300 mm, and the length of the cathode immersed in the electrolyte is at least 100 mm.

Further, the step 1) also includes the following steps: filing the lower end of the copper rod sample, and simultaneously removing the protective wax coating and residual emulsion on the surface of the copper rod sample.

As mentioned above, the copper rod oxide film thickness testing method for electrician related to the present invention has the following beneficial effects:

This test method is used to detect the thickness of the oxide film on the surface of the electrical copper rod. The test operation steps of the test method are very convenient and fast, and can accurately measure the thickness value of the oxide film, so the measurement accuracy is high. Provide a strong basis for subsequent processing.

Description of drawings

Fig. 1 is the structural representation of the copper rod oxide film thickness testing device for electrician in the present invention.

Fig. 2 is a reaction time chart of the cathode in the present invention.

Component designation description

1 DC current source

2 Data recording and processing system

3 electrolyzer

4 cathodes

5 anodes

6 fuel gauge

7 reference electrode

detailed description

The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention. Limiting conditions, so there is no technical substantive meaning, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect and purpose of the present invention, should still fall within the scope of the present invention. The disclosed technical content must be within the scope covered. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any substantial change in the technical content.

As shown in Fig. 1, the present invention provides a kind of copper rod oxide film thickness testing device for electrician, comprises direct current source 1, data recording and processing system 2, and the electrolyzer 3 that is filled with electrolyte solution, in the electrolyzer 3 A cathode 4 made of a copper rod for electricians and an anode 5 made of an inert metal are provided, the lower ends of the cathode 4 and the anode 5 are immersed in the electrolyte, and the two ends of the direct current source 1 are respectively It is connected with the cathode 4 and the anode 5, and the cathode 4 is connected with the data recording and processing system 2.

The present invention also provides a method for testing the oxide film thickness of a copper rod for electricians, which comprises the following steps in sequence:

1), cut a section of copper rod from the straightened electrician copper rod as a copper rod sample;

2), the copper rod sample is packed in the electrolytic cell 3 as negative electrode 4, is also provided with an anode 5 made of inert metal in this electrolytic cell 3, the lower end of described negative electrode 4 and the lower end of anode 5 all immerse and hold in In the electrolyte in the electrolytic cell 3; in the present embodiment, the material of the anode 5 is platinum wire;

3), the anode 5 and the cathode 4 are respectively connected to the two ends of a direct current source 1, and the cathode 4 is connected to a data recording and processing system 2 at the same time;

4), connect the DC current source 1, start the test, then the data recording and processing system 2 automatically records the reduction reaction time t1 of the cuprous oxide on the surface of the cathode 4 and the reduction reaction time t2 of the copper oxide;

5), the thickness T1 of cuprous oxide is $T1=\frac{I*t1*m1}{S*d1*f*\mathrm{no}},$ The thickness T2 of copper oxide is $T1=\frac{I*t2*m2}{S*d2*f*\mathrm{no}};$

In the above formula: I is the current value (A);

M1, M2 are respectively the molecular weight (g/mol) of cuprous oxide and cupric oxide;

S is the area (cm ² ) of the cathode 4 immersed in the electrolyte;

d1 and d2 are the densities (g/cm ³ ) of cuprous oxide and copper oxide respectively, d1=6.0g/cm ³ , d2=6.4g/cm ³ ;

F is Faraday's constant, F=96500C/mol;

n is hydrogen equivalent, is a constant, n=2;

6) The thickness of the oxide film on the copper rod for electrician is T=T1+T2.

The above testing device and testing method adopt the electrolytic method to test the thickness of the oxide film on the surface of the copper rod for electrical use, and the oxide film is composed of cuprous oxide and copper oxide. During the test, a certain length of copper rod sample cut from the electrical copper rod to be tested is used as the cathode 4, and after the DC current source 1 is connected to start the test, after the electrolyte is electrolyzed, hydrogen is generated at the cathode 4 ions; due to the difference in potential, hydrogen ions undergo electrolytic reduction reactions with cuprous oxide and copper oxide in sequence, and the reaction chemical formulas are: Cu ₂ O+2H ⁺ ＝2Cu+H ₂ O; CuO+2H ⁺ ＝Cu+H ₂ O; when cuprous oxide and copper oxide are all electrolytically reduced, then the surface of the cathode 4 begins to produce bubbles, which are hydrogen, which indicates that the experiment is over, and the direct current source 1 can be turned off. During the whole test process, the data recording and processing system 2 automatically records the voltage and the corresponding reaction time during the whole test; the curve of voltage---response time is as shown in Figure 2, as can be seen from Figure 2: cuprous oxide Cu ₂ O The reaction speed is faster, and the curve corresponding to the time t1 at which the reaction of cuprous _oxide Cu2O ends forms the first inflection point, which is also the starting reaction time of copper oxide CuO; the curve forms after the reaction of copper oxide CuO for a period of time t2 The second inflection point, the second inflection point is the time when the copper oxide CuO reaction ends, after which bubbles begin to be generated on the surface of the cathode 4, and the slope of the voltage-reaction time curve slows down. The data recording and processing system 2 obtains the reaction time t1 of cuprous oxide and the reaction time t2 of cuprous oxide by capturing the inflection point of the curve of voltage---response time, and then calculates the reaction time t2 of cuprous oxide according to the formula in step 5) respectively. The thickness T1 and the thickness T2 of copper oxide, and finally the thickness T1 of cuprous oxide and the thickness T2 of copper oxide can be added to obtain the thickness T of the oxide film on the surface of the copper rod for electrical use. The units of T1, T2 and T are all for cm.

It can be seen that, when the test device and test method involved in the present invention detect the thickness of the oxide film on the surface of the electrical copper rod, the test operation steps are very convenient and fast, and the thickness value of the oxide film can be accurately measured, so the measurement accuracy is high. , to provide a strong basis for the subsequent processing of copper rods for electricians.

Further, as shown in FIG. 1 , it also includes a coulometer 6, which is connected to the DC current source 1 and the data recording and processing system 2 respectively. The magnitude of the current output by the source 1, and transmit the magnitude of the current to the data recording and processing system 2. Before the test, the original parameters of the copper rod sample (ie M1, M2, S, d1, d2, F, n) are input into the data recording and processing system 2, and the data recording and processing system 2 automatically captures the reaction time t1 during the experiment and t2, while the electricity meter 6 transmits the size of the current value I to the data recording and processing system 2, so the data recording and processing system 2 can automatically calculate and display the measurement result value of the oxide film thickness after internal programming, thereby realizing automatic measurement and automation Calculation, improve test efficiency and calculation accuracy.

Preferably, as shown in FIG. 1 , a reference electrode 7 immersed in the electrolyte is also provided in the electrolytic cell 3 , and the reference electrode 7 is connected to the data recording and processing system 2 . The reference electrode 7 is used to find the potential balance and ensure the zero adjustment of the test device before starting the experiment, so as to improve the measurement accuracy of the oxide film thickness and greatly reduce the error.

Preferably, in this embodiment, the electrolyte is a 0.1 mol sodium carbonate solution, and the carbonate ions in the sodium carbonate solution are weak acid ions, which can undergo hydrolysis reaction with water: Na ₂ CO ₃ +H ₂ O== NaOH+NaHCO ₃ ; HCO3 ^- = H ⁺ +CO ₃ ^2- in NaHCO ₃ after electrification provides H ⁺ for reaction.

Further, the length of the cathode 4 is 150-300 mm, and the length of the cathode 4 immersed in the electrolyte is at least 100 mm. In addition, the step 1) also includes the following steps: file the lower end of the copper rod sample with a file or other means, and clean the copper rod sample carefully with alcohol or other organic solvents to remove the protective wax coating on the surface of the copper rod sample. Layer and residual emulsion, and then put the copper rod sample as the cathode 4 into the electrolytic cell 3 to improve the measurement accuracy and reduce the measurement error caused by impurities on the surface of the copper rod sample.

To sum up, the present invention effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims (8)

1. a copper rod oxide film thickness testing device for electrician, it is characterized in that: comprise direct current source, data recording and processing system and the electrolyzer that is filled with electrolyte, be provided with in the described electrolyzer by copper rod for electrician The cathode and the anode made of inert metal, the lower end of the cathode and the lower end of the anode are immersed in the electrolyte, the two ends of the direct current source are respectively connected with the cathode and the anode, and the cathode and the data Records processing systems are connected. 2. The copper rod oxide film thickness testing device for electricians according to claim 1, characterized in that: it also includes a galvanometer, which is respectively connected with a DC current source and a data recording and processing system for measuring DC current The magnitude of the current output by the source, and transmit the magnitude of the current to the data recording and processing system. 3. The copper rod oxide film thickness testing device for electricians according to claim 1, characterized in that: a reference electrode immersed in the electrolyte is also provided in the electrolytic cell, and the reference electrode is connected with the data recording and processing system. connect. 4. a copper rod oxide film thickness test method for electrician, is characterized in that: comprises the following steps successively: 1), cut a section of copper rod from the straightened electrician copper rod as a copper rod sample; 2), the copper rod sample is loaded into the electrolytic cell as the cathode, and an anode made of an inert metal is also provided in the electrolytic cell, and the lower end of the cathode and the lower end of the anode are immersed in the electrolyte contained in the electrolytic cell middle; 3), connecting the anode and the cathode to both ends of a direct current source, and simultaneously connecting the cathode to a data recording and processing system; 4), connect the DC current source, start the test, then the data recording processing system automatically records the reduction reaction time t1 of the cuprous oxide on the surface of the cathode and the reduction reaction time t2 of the copper oxide; 5), the thickness T1 of cuprous oxide is $T1=\frac{I*t1*m1}{S*d1*f*\mathrm{no}},$ The thickness T2 of copper oxide is $T1=\frac{I*t2*m2}{S*d2*f*\mathrm{no}};$ In the above formula: I is the current value (A); M1, M2 are respectively the molecular weight (g/mol) of cuprous oxide and cupric oxide; S is the area of the cathode immersed in the electrolyte (cm ² ); d1 and d2 are the densities (g/cm ³ ) of cuprous oxide and copper oxide respectively; F is Faraday's constant, F=96500C/mol; n is a hydrogen equivalent, n=2; 6) The thickness of the oxide film on the copper rod for electrician is T=T1+T2. 5. The method for testing the oxide film thickness of an electric copper rod according to claim 4, characterized in that: the electrolyte is a 0.1mol sodium carbonate solution. 6. The method for measuring the oxide film thickness of an electrical copper rod according to claim 4, characterized in that: the anode is made of platinum wire. 7. The method for measuring the oxide film thickness of an electric copper rod according to claim 4, characterized in that: the length of the cathode is 150-300 mm, and the length of the cathode immersed in the electrolyte is at least 100 mm. 8. The copper rod oxide film thickness testing method for electricians according to claim 4, characterized in that: said step 1) also includes the steps of: filing the lower end of the copper rod sample flat, and removing the protection of the copper rod sample surface simultaneously Wax coating and residual emulsion.