Corrosion resistance detection method for copper alloy wire

Abstract

The invention discloses a copper alloy wire corrosion resistance detection method, and relates to the technical field of copper alloy wire corrosion resistance detection, and the method comprises the following steps: preparing a salt solution; preparing a polymorphic sample; arranging an anti-corrosion pipeline; performing test operation; checking the corrosion degree; and judging the corrosion grade. According to the method for detecting the corrosion resistance of the copper alloy wire, a replaceable anti-corrosion film sleeve is arranged, so that a salt solution flows along the interior of the anti-corrosion film sleeve and does not make contact with the inner wall of a pipeline, and therefore the inner wall of the pipeline is prevented from being corroded; and the anti-corrosion film sleeve is regularly replaced or the damaged anti-corrosion film sleeve is replaced in time so as to ensure that the inner wall of the pipeline is not damaged for a long time, and during replacement operation, the motor is used for driving the winding disc to rotate so that the anti-corrosion film sleeve can automatically stretch, penetrate or automatically retract and retreat in the pipeline, so that the replacement and installation difficulty of the anti-corrosion film sleeve is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of copper alloy wire corrosion resistance detection, and in particular to a copper alloy wire corrosion resistance detection method. Background Art

[0002] The corrosion resistance test of copper alloy wire is an important part to ensure its long-term stable use in a specific environment. According to the application environment and expected corrosion type of the copper alloy wire, select the appropriate corrosion resistance test method, such as salt spray test, immersion test, etc. Among them, the salt spray test is to place the sample in a salt spray chamber and conduct the test according to the temperature, salt solution concentration and spray rate specified in the standard to simulate the marine environment or saline environment, and evaluate the corrosion resistance of the wire under salt spray conditions.

[0003] The existing copper alloy wire corrosion resistance test requires the delivery of salt solution through a pipeline during the salt spray test. Even if the inner wall of the pipeline is treated with a special anti-corrosion coating, the anti-corrosion coating is at risk of falling off and cracking after long-term use, resulting in direct contact between the salt solution and the inner wall of the pipeline, thereby damaging the pipeline. Replacing the entire pipeline or repairing the coating is troublesome.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a method for detecting the corrosion resistance of copper alloy wire is proposed. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method for detecting the corrosion resistance of a copper alloy wire, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented by the following technical scheme: a method for detecting the corrosion resistance of a copper alloy wire, the method comprising the following steps:

[0007] Step 1: Prepare a salt solution. The salt solution is sodium chloride and deionized water or distilled water. The concentration of the salt solution is 5% by mass, that is, 50 grams of sodium chloride is added to every liter of water. The specific configuration of the salt solution is as follows: dissolve sodium chloride in deionized water, stir evenly, use a pH meter to measure the pH value of the solution, and adjust it according to the required pH value;

[0008] Step 2: Multi-state sample preparation: Use a hanging device to hang multiple wire samples, keep each sample in its state and place them in a salt spray chamber. Prior to this, the salt spray chamber is preheated and inspected and debugged.

[0009] Step 3: Anti-corrosion pipeline installation: a replaceable anti-corrosion film sleeve is installed on the inner wall of the pipeline that needs to transmit the salt solution. The salt solution flows inside the pipeline along the inside of the anti-corrosion film sleeve until it reaches the inside of the salt spray chamber and is sprayed out from the nozzle in atomization;

[0010] Step 4: Test operation: set the test time according to the requirements or purpose, keep the nozzle spraying during the test, and check the operating parameters of the salt spray chamber regularly;

[0011] Step 5: Corrosion inspection. After the test, take out the sample and clean it according to the requirements. After cleaning, carefully observe the surface of the sample to record the corrosion morphology and calculate the corrosion rate. The calculation method adopts the weight loss method, that is, the corrosion rate is calculated based on the weight difference before and after corrosion, the surface area of ​​the sample and the corrosion time. The formula is as follows:

[0012] CR=(W1-W2)÷(A×T×ρ)

[0013] Before calculating the corrosion rate, it is necessary to ensure that the corrosion products have been completely removed;

[0014] Step 6: Determine the corrosion grade. Refer to standards such as GB / T 6461-2002 for rating of samples of metals and other inorganic coatings after corrosion tests. You can also grade the samples according to the area and degree of corrosion, or you can evaluate them according to specific product standards or industry standards.

[0015] Furthermore, in step 1, the pH value of the salt solution is between 6.5 and 7.2, and is adjusted by adding dilute hydrochloric acid or sodium hydroxide solution.

[0016] Furthermore, in step 2, the states of the plurality of wire samples are respectively a relaxed state, a tight state, and a taut state, wherein the relaxed state means that the wire is not straightened, the tight state means that the wire is in a straightened state, and the taut state means that the wire is in a straightened state and the tension is greater than that in the tight state.

[0017] Furthermore, in step 2, the wire sample is hung or placed in the test box at an angle of 15°-30° to the vertical direction, and the samples do not touch or drip each other, and the sample position needs to avoid the direct spray area of ​​the nozzle.

[0018] Furthermore, in step 4, the test time includes but is not limited to 24h, 48h, 96h, 168h, 500h and 1000h.

[0019] Furthermore, in step 4, the operating parameters of the salt spray chamber include but are not limited to parameters such as temperature data, spray volume, and salt solution concentration, and when a parameter abnormality occurs, an alarm is triggered and handled according to the emergency treatment plan, and the abnormal situation is recorded.

[0020] Furthermore, in step five, the corrosion morphology includes pitting corrosion, uniform corrosion, exfoliation corrosion, etc., corrosion area, and corrosion depth.

[0021] Furthermore, in step five, CR is the corrosion rate, W1 is the weight of the sample before corrosion, W2 is the weight of the sample after corrosion, A is the surface area of ​​the sample, T is the corrosion time, and ρ is the material density.

[0022] Furthermore, in step three, the anti-corrosion pipeline is provided including a salt spray box, a sleeve sleeve is provided on the back of the salt spray box, and the end of the sleeve sleeve is connected to a membrane sleeve end via a flange, the membrane sleeve end is connected to a pipeline via a flange, and an anti-corrosion film sleeve is passed through the interior of the pipeline.

[0023] Furthermore, a driving motor is arranged on the back of the salt spray box below the sleeve, and the end of the driving motor is connected to a driving shaft, a first winding drum is arranged in the middle of the driving shaft, and a wire rope is wound around the surface of the first winding drum, the wire rope runs through the inside of the pipeline, and a second winding drum is arranged at one end of the wire rope away from the first winding drum, and a hook is arranged on the surface of the wire rope.

[0024] The present invention provides a method for detecting the corrosion resistance of a copper alloy wire, which has the following beneficial effects:

[0025] 1. The method for detecting the corrosion resistance of copper alloy wire is provided with a replaceable anti-corrosion film sleeve so that the salt solution flows along the inside of the anti-corrosion film sleeve without contacting the inner wall of the pipeline, thereby preventing the inner wall of the pipeline from being corroded. The anti-corrosion film sleeve is replaced regularly or the damaged anti-corrosion film sleeve is replaced in time to ensure that the inner wall of the pipeline is not damaged for a long time. During the replacement operation, the motor is used to drive the winding reel to rotate to realize the automatic extension and insertion or automatic contraction and withdrawal of the anti-corrosion film sleeve inside the pipeline, thereby greatly reducing the difficulty of replacing and installing the anti-corrosion film sleeve.

[0026] 2. The method for testing the corrosion resistance of copper alloy wires is to set three wire samples in a relaxed state, a tight state, and a taut state, and conduct a salt spray test on them in the same testing environment. After the test, the corrosion conditions of the wire samples themselves in different states can be simultaneously obtained through judgment, thereby providing the best use state for the subsequent use of the wire to extend the service life of the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a process of a method for detecting corrosion resistance of a copper alloy wire according to the present invention;

[0028] Figure 2 A schematic diagram of the front structure of a salt spray box for a method for testing the corrosion resistance of a copper alloy wire according to the present invention;

[0029] Figure 3 A schematic diagram of the back structure of a salt spray box for a method for testing the corrosion resistance of a copper alloy wire according to the present invention;

[0030] Figure 4 It is a schematic diagram of the connection structure of the sleeve tube sleeve and the membrane sleeve end head of a method for detecting the corrosion resistance of a copper alloy wire in the present invention;

[0031] Figure 5 It is a schematic diagram of the explosion structure of a method for detecting the corrosion resistance of a copper alloy wire according to the present invention;

[0032] Figure 6 The present invention is a schematic diagram of a wire rope structure of a method for detecting corrosion resistance of a copper alloy wire.

[0033] In the figure: 1. Salt spray chamber; 2. Socket sleeve; 3. Membrane sleeve end; 4. Pipeline; 5. Anti-corrosion membrane sleeve; 6. Drive motor; 7. Drive shaft; 8. First reel; 9. Wire rope; 10. Second reel; 11. Hook. DETAILED DESCRIPTION

[0034] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] like Figure 1-Figure 6 As shown, the present invention provides a technical solution: a method for detecting the corrosion resistance of a copper alloy wire, the method for detecting the corrosion resistance of a copper alloy wire comprising the following steps:

[0036] Step 1: Prepare a salt solution. The salt solution is sodium chloride and deionized water or distilled water. The concentration of the salt solution is 5% by mass fraction, that is, 50 grams of sodium chloride is added to every 1 liter of water. The specific configuration of the salt solution is as follows: dissolve sodium chloride in deionized water and stir evenly. Use a pH meter to measure the pH value of the solution and adjust it according to the required pH value. The pH value of the salt solution is between 6.5 and 7.2, which is adjusted by adding dilute hydrochloric acid or sodium hydroxide solution;

[0037] Step 2: Multi-state sample preparation, use a suspension device to suspend multiple wire samples, keep each sample state and place them in the salt spray chamber, and before that, the salt spray chamber is preheated and inspected and debugged, the states of multiple wire samples are relaxed state, tight state, and taut state, where the relaxed state means that the wire is not straightened, the tight state means that the wire is in a straightened state, and the taut state means that the wire is in a straightened state and the tension is greater than the tension in the tight state, and the wire samples are suspended or placed in the test chamber at an angle of 15°-30° to the vertical direction, and the samples do not touch or drip each other, and the sample position needs to avoid the direct spray area of ​​the nozzle;

[0038] Step 3: Anti-corrosion pipeline installation: a replaceable anti-corrosion film sleeve is installed on the inner wall of the pipeline that needs to transmit the salt solution. The salt solution flows inside the pipeline along the inside of the anti-corrosion film sleeve until it reaches the inside of the salt spray chamber and is sprayed out from the nozzle in atomization;

[0039] Step 4: Test operation. Set the test time according to the requirements or purpose. The nozzle will continue to spray during the test, and the operating parameters of the salt spray box will be checked regularly. The test time includes but is not limited to 24h, 48h, 96h, 168h, 500h and 1000h. The operating parameters of the salt spray box include but are not limited to temperature data, spray volume, salt solution concentration and other parameters. When abnormal parameters occur, trigger an alarm and handle them according to the emergency treatment plan, and record the abnormal situation at the same time.

[0040] Step 5: Corrosion inspection. After the test, take out the sample and clean it according to the requirements. After cleaning, carefully observe the surface of the sample to record the corrosion morphology, which includes pitting corrosion, uniform corrosion, exfoliation corrosion, etc., corrosion area, corrosion depth, and calculate the corrosion rate. The calculation method adopts the weight loss method, that is, the corrosion rate is calculated based on the weight difference before and after corrosion, the surface area of ​​the sample and the corrosion time. The formula is as follows:

[0041] CR=(W1-W2)÷(A×T×ρ)

[0042] CR is the corrosion rate, W1 is the weight of the sample before corrosion, W2 is the weight of the sample after corrosion, A is the surface area of ​​the sample, T is the corrosion time, and ρ is the material density;

[0043] Before calculating the corrosion rate, it is necessary to ensure that the corrosion products have been completely removed;

[0044] Step 6: Determine the corrosion grade. Refer to standards such as GB / T 6461-2002 for rating of samples of metals and other inorganic coatings after corrosion tests. You can also grade the samples according to the area and degree of corrosion, or you can evaluate them according to specific product standards or industry standards.

[0045] like Figure 2-Figure 6 As shown, in step three, the anti-corrosion pipeline is provided with a salt spray box 1, a sleeve tube sleeve 2 is provided on the back of the salt spray box 1, and the end of the sleeve tube sleeve 2 is connected to a membrane sleeve end 3 through a flange, the membrane sleeve end 3 is connected to a pipeline 4 through a flange, and an anti-corrosion membrane sleeve 5 is penetrated inside the pipeline 4, a driving motor 6 is provided on the back of the salt spray box 1 below the sleeve tube sleeve 2, and the end of the driving motor 6 is connected to a driving shaft 7, a first winding drum 8 is provided in the middle of the driving shaft 7, and a wire rope 9 is wound on the surface of the first winding drum 8, the wire rope 9 runs through the interior of the pipeline 4, and a second winding drum 10 is provided at one end of the wire rope 9 away from the first winding drum 8, and a hook 11 is provided on the surface of the wire rope 9;

[0046] The specific operation is as follows: a limiting groove is provided at the bottom of the inner wall of the pipe 4 to accommodate the passage of the wire rope 9, which is not shown in the figure, and the length of the pipe 4 shown in the figure is a reference length, and the actual length is based on the actual layout. The inside of the limiting groove is provided with steering wheels at each corner according to the pipe 4 and the direction of the wire rope 9 to change the direction of the wire rope 9. The anti-corrosion film sleeve 5 is installed inside the sleeve pipe sleeve 2, and the installation steps are as follows: a hole is opened on the end surface of the anti-corrosion film sleeve 5 and it is compressed and placed inside the pipe 4, and then the hook 11 is passed through the hole on the end surface of the anti-corrosion film sleeve 5 to achieve hooking. The end of the anti-corrosion film sleeve 5 away from the hook 11 is manually fastened to the film sleeve end 3 and connected to the end of the pipe 4 through a flange, and then the driving motor 6 is started to make the driving shaft 7 carry the first winding drum 8 to rotate, and a motor is also provided on the side of the second winding drum 10 to drive it to rotate. When the first winding drum 8 rotates, the wire rope 9 is wound, and at the same time, the second winding drum 10 is rotated under force to release the wire rope. 9, the wire rope 9 is therefore transmitted along the inner limit groove at the bottom of the inner wall of the pipe 4, thereby carrying one end of the anti-corrosion film sleeve 5 along the inner wall of the pipe 4 through the hook 11, so that the anti-corrosion film sleeve 5 can be stretched until the hooked end of the anti-corrosion film sleeve 5 moves to the position of the first winding drum 8. After the hooked end of the anti-corrosion film sleeve 5 moves into place, the film sleeve end head 3 is manually tightened at this end and connected to the flange at the end of the pipe 4, and the film sleeve end head 3 at one end of the pipe 4 close to the first winding drum 8 is respectively connected to the sleeve pipe sleeve 2 through the flange, and the sleeve pipe sleeve 2 is connected to the nozzle inside the salt spray box 1 through the pipeline, wherein after the anti-corrosion film sleeve 5 moves into place, the hook 11 is manually removed and rotated to make its side stick to the inner wall of the pipe 4, and when the film sleeve end head 3 is tightened, the hole position is covered to prevent the hole position from being exposed and causing solution leakage, and when the film sleeve end head 3 is connected to the end of the pipe 4 through the flange, a groove is provided at the bottom of the flange for the wire rope 9 to pass through;

[0047] Similarly, when the anti-corrosion film sleeve 5 needs to be replaced, it is only necessary to remove the film sleeve end 3 in turn, use the hook 11 to hook the hole position of the anti-corrosion film sleeve 5, and reversely drive the second winding drum 10 and the first winding drum 8 to rotate, so that the wire rope 9 moves in the opposite direction to compress the anti-corrosion film sleeve 5 so that it withdraws from the outer end of the pipeline 4, and then replace the new anti-corrosion film sleeve 5 and repeat the above operation to replace it;

[0048] Therefore, based on the above description, when the salt solution is injected into the nozzle inside the salt spray box 1 for atomization and spraying, the salt solution flows along the inside of the anti-corrosion film sleeve 5 without contacting the inner wall of the pipeline 4, thereby preventing the inner wall of the pipeline 4 from being corroded, and the anti-corrosion film sleeve 5 is replaced regularly or the damaged anti-corrosion film sleeve 5 is replaced in time to ensure that the inner wall of the pipeline 4 is not damaged for a long time, and the replacement operation is simple and convenient.

[0049] In summary, when the copper alloy wire corrosion resistance detection method is used, the salt solution is firstly sodium chloride and deionized water or distilled water. The specific configuration of the salt solution is as follows: sodium chloride is dissolved in deionized water, stirred evenly, and the pH value of the solution is measured using a pH meter, and adjusted according to the required pH value;

[0050] A plurality of wire samples are suspended by a suspension device, and each sample is kept in a state and placed in a salt spray chamber. Prior to this, the salt spray chamber is preheated and inspected and debugged. The states of the plurality of wire samples are respectively a relaxed state, a tight state, and a taut state;

[0051] A replaceable anti-corrosion film sleeve is installed on the inner wall of the pipeline that needs to transmit the salt solution. The salt solution flows inside the pipeline along the inside of the anti-corrosion film sleeve until it reaches the inside of the salt spray chamber and is sprayed out from the nozzle in atomization;

[0052] The test time is set according to the requirements or purpose. The nozzle sprays continuously during the test, and the operating parameters of the salt spray box are checked regularly. After the test, the sample is taken out and cleaned according to the requirements. After cleaning, the surface of the sample is carefully observed to record the corrosion morphology, which includes pitting corrosion, uniform corrosion, exfoliation corrosion, etc., corrosion area, corrosion depth, and corrosion rate calculation. The calculation method adopts the weight loss method, that is, the corrosion rate is calculated based on the weight difference before and after corrosion, the surface area of ​​the sample and the corrosion time. The formula is as follows:

[0053] CR=(W1-W2)÷(A×T×ρ)

[0054] CR is the corrosion rate, W1 is the weight of the sample before corrosion, W2 is the weight of the sample after corrosion, A is the surface area of ​​the sample, T is the corrosion time, and ρ is the material density;

[0055] Corrosion grade determination, refer to standards such as GB / T 6461-2002 metal and other inorganic coatings after corrosion test sample rating, can also be graded according to the area and degree of corrosion, can also be assessed according to specific product standards or industry standards;

[0056] Based on the above description, the present invention sets three wire samples in a relaxed state, a tight state, and a taut state, and conducts a salt spray test on them in the same testing environment. Therefore, after the test, the corrosion conditions of the wire samples themselves in different states can be simultaneously obtained through judgment, thereby providing the best usage state for the subsequent use of the wire to extend the service life of the wire.

[0057] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A method for detecting the corrosion resistance of a copper alloy wire, characterized in that: The method for detecting the corrosion resistance of a copper alloy wire comprises the following steps: Step 1: Prepare a salt solution. The salt solution is sodium chloride and deionized water or distilled water. The concentration of the salt solution is 5% by mass, that is, 50 grams of sodium chloride is added to every liter of water. The specific configuration of the salt solution is as follows: dissolve sodium chloride in deionized water, stir evenly, use a pH meter to measure the pH value of the solution, and adjust it according to the required pH value; Step 2: Multi-state sample preparation: Use a hanging device to hang multiple wire samples, keep each sample in its state and place them in a salt spray chamber. Prior to this, the salt spray chamber is preheated and inspected and debugged. Step 3: Anti-corrosion pipeline installation: a replaceable anti-corrosion film sleeve is installed on the inner wall of the pipeline that needs to transmit the salt solution. The salt solution flows inside the pipeline along the inside of the anti-corrosion film sleeve until it reaches the inside of the salt spray chamber and is sprayed out from the nozzle in atomization; Step 4: Test operation: set the test time according to the requirements or purpose, keep the nozzle spraying during the test, and check the operating parameters of the salt spray chamber regularly; Step 5: Corrosion inspection. After the test, take out the sample and clean it according to the requirements. After cleaning, carefully observe the surface of the sample to record the corrosion morphology and calculate the corrosion rate. The calculation method adopts the weight loss method, that is, the corrosion rate is calculated based on the weight difference before and after corrosion, the surface area of ​​the sample and the corrosion time. The formula is as follows: CR=(W1-W2)÷(A×T×ρ) Before calculating the corrosion rate, it is necessary to ensure that the corrosion products have been completely removed; Step 6: Determine the corrosion grade. Refer to standards such as GB / T 6461-2002 for rating of samples of metals and other inorganic coatings after corrosion tests. You can also grade the samples according to the area and degree of corrosion, or you can evaluate them according to specific product standards or industry standards.

2. A method for detecting corrosion resistance of a copper alloy wire according to claim 1, characterized in that: In the step 1, the pH value of the salt solution is between 6.5 and 7.2, which is adjusted by adding dilute hydrochloric acid or sodium hydroxide solution.

3. A method for detecting corrosion resistance of a copper alloy wire according to claim 1, characterized in that: In step 2, the states of the plurality of wire samples are respectively a relaxed state, a tight state, and a taut state, wherein the relaxed state means that the wire is not straightened, the tight state means that the wire is in a straightened state, and the taut state means that the wire is in a straightened state and the tension is greater than that in the relaxed state.

4. A method for detecting corrosion resistance of a copper alloy wire according to claim 1, characterized in that: In the step 2, the wire sample is hung or placed in the test box at an angle of 15°-30° to the vertical direction, and the samples do not touch or drip each other, and the sample position needs to avoid the direct spray area of ​​the nozzle.

5. A method for detecting corrosion resistance of a copper alloy wire according to claim 1, characterized in that: In step 4, the test time includes but is not limited to 24h, 48h, 96h, 168h, 500h and 1000h.

6. A method for detecting corrosion resistance of a copper alloy wire according to claim 1, characterized in that: In step 4, the operating parameters of the salt spray chamber include but are not limited to parameters such as temperature data, spray volume, and salt solution concentration. When an abnormal parameter occurs, an alarm is triggered and handled according to the emergency treatment plan, and the abnormal situation is recorded at the same time.

7. A method for detecting corrosion resistance of a copper alloy wire according to claim 1, characterized in that: In the step 5, the corrosion morphology includes pitting corrosion, uniform corrosion, exfoliation corrosion, etc., corrosion area, and corrosion depth.

8. A method for detecting corrosion resistance of a copper alloy wire according to claim 1, characterized in that: In the step 5, CR is the corrosion rate, W1 is the weight of the sample before corrosion, W2 is the weight of the sample after corrosion, A is the surface area of ​​the sample, T is the corrosion time, and ρ is the material density.

9. A method for detecting corrosion resistance of a copper alloy wire according to claim 1, characterized in that: In the step three, the anti-corrosion pipeline is provided with a salt spray box (1), a sleeve tube sleeve (2) is provided on the back of the salt spray box (1), and the end of the sleeve tube sleeve (2) is connected to a membrane sleeve end (3) via a flange, the membrane sleeve end (3) is connected to a pipeline (4) via a flange, and an anti-corrosion membrane sleeve (5) is inserted into the interior of the pipeline (4).

10. A method for detecting corrosion resistance of a copper alloy wire according to claim 9, characterized in that: A driving motor (6) is arranged on the back of the salt spray chamber (1) below the sleeve tube (2), and the end of the driving motor (6) is connected to a driving shaft (7), a first winding disc (8) is arranged in the middle of the driving shaft (7), and a wire rope (9) is wound around the surface of the first winding disc (8), the wire rope (9) passes through the interior of the pipeline (4), and a second winding disc (10) is arranged at one end of the wire rope (9) away from the first winding disc (8), and a hook (11) is arranged on the surface of the wire rope (9).

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