CN109612919B - Method for detecting galvanic couple type atmospheric corrosion sensor - Google Patents
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- 238000005260 corrosion Methods 0.000 title claims abstract description 327
- 230000007797 corrosion Effects 0.000 title claims abstract description 327
- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000008859 change Effects 0.000 claims abstract description 31
- 238000009413 insulation Methods 0.000 claims abstract description 23
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 22
- 229910052725 zinc Inorganic materials 0.000 claims description 22
- 239000011701 zinc Substances 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 18
- 230000004044 response Effects 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 239000010405 anode material Substances 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 230000008569 process Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 3
- 239000010406 cathode material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a method for detecting a galvanic atmospheric corrosion sensor, which comprises the following steps: step 1): measuring the insulation resistance value between the cathode and the anode of the galvanic couple type atmospheric corrosion sensor, preliminarily judging whether the galvanic couple type atmospheric corrosion sensor is effective or not based on the insulation resistance value, and if the galvanic couple type atmospheric corrosion sensor is preliminarily judged to be effective, continuing to perform the following step 2); step 2): detecting and recording the corrosion current value of the couple atmospheric corrosion sensor under the conditions of room temperature and various humidities, judging whether the detected corrosion current value is in a preset range, and if so, continuing to perform the following step 3); and step 3): and detecting and analyzing the change of the corrosion current value of the galvanic couple type atmospheric corrosion sensor along with the change of humidity.
Description
Technical Field
The invention belongs to the technical field of sensor detection methods, and particularly relates to a method for detecting a galvanic couple type atmospheric corrosion sensor.
Background
The galvanic couple type atmospheric corrosion sensor takes the atmosphere as a corrosion medium according to the difference of corrosion potentials of cathode and anode materials, realizes the detection of atmospheric corrosion by detecting the corrosion current between the cathode and the anode, and solves the problems of long atmospheric corrosion period, large workload, discontinuous data and the like in the traditional exposed sample detection.
The structural form, the cathode material and the anode material of the couple atmospheric corrosion sensor can be selected in various ways, and the sensitivity, the precision and the consistency of the sensor have great influence on the detection result. At present, relevant corrosion sensors at home and abroad do not have unified specifications and detection methods, and can be evaluated only by comparing with long-term test results of outdoor exposed corrosion samples, so that the evaluation period is long, and the requirements of the sensor batch production process are difficult to meet. The corrosion sensor is required to be sensitive to atmospheric environment change, high in precision and good in consistency, only the corrosion sensor meeting the three points can accurately evaluate atmospheric corrosion, and evaluations made in different regions are comparable.
Disclosure of Invention
In order to solve the problems, the invention provides a detection method of a galvanic couple type atmospheric corrosion sensor, which can be used for screening the galvanic couple type atmospheric corrosion sensor and quickly evaluating the quality of the galvanic couple type atmospheric corrosion sensor.
The method for detecting the galvanic couple type atmospheric corrosion sensor comprises the following steps: step 1): measuring the insulation resistance value between the cathode and the anode of the galvanic couple type atmospheric corrosion sensor, preliminarily judging whether the galvanic couple type atmospheric corrosion sensor is effective or not based on the insulation resistance value, and if the galvanic couple type atmospheric corrosion sensor is preliminarily judged to be effective, continuing to perform the following step 2); step 2): detecting and recording the corrosion current value of the couple atmospheric corrosion sensor under the conditions of room temperature and various humidities, judging whether the detected corrosion current value is in a preset range, and if so, continuing to perform the following step 3); and step 3): and detecting and analyzing the change of the corrosion current value of the galvanic couple type atmospheric corrosion sensor along with the change of humidity.
Preferably, in step 1), the insulation resistance value is measured using a multimeter under conditions of room temperature and a relative humidity of 10% to 50%.
Preferably, when the anode of the galvanic atmospheric corrosion sensor is made of zinc, if the insulation resistance value is measured to be greater than or equal to 1K Ω in step 1), the galvanic atmospheric corrosion sensor is preliminarily judged to be effective.
Preferably, when the anode of the couple atmospheric corrosion sensor is made of zinc, if the insulation resistance value is measured to be 80M Ω under the conditions of 25 ℃ and 30% RH in step 1), the couple atmospheric corrosion sensor is preliminarily judged to be effective.
Preferably, in step 2), the galvanic atmospheric corrosion sensor is connected to an electrochemical workstation or a picoampere meter with the accuracy of 0.01nA or more, so that the corrosion current value of the galvanic atmospheric corrosion sensor can be continuously and accurately detected and recorded.
Preferably, in the step 2), the method comprises the following steps: step 2 a): detecting whether the corrosion current density value is in a first preset range or not under the conditions of 25 ℃ and 10% -50% RH, if so, continuing to perform the following step 2b), otherwise, judging that the galvanic atmospheric corrosion sensor is unqualified; step 2 b): detecting whether the corrosion current density value is in a second preset range or not under the conditions of 25 ℃ and 50% RH +/-3% RH, if so, continuing to perform the following step 2c), otherwise, judging that the galvanic couple type atmospheric corrosion sensor is unqualified; step 2 c): detecting whether the corrosion current density value is in a third preset range or not under the conditions of 25 ℃ and 80% RH +/-3% RH, if so, continuing to perform the following step 2d), otherwise, judging that the galvanic couple atmospheric corrosion sensor is unqualified; and step 2 d): and (3) detecting whether the corrosion current density value is in a fourth preset range or not under the conditions of 25 ℃ and 98% RH +/-3% RH, if so, continuing to perform the step 3), and otherwise, judging that the galvanic atmospheric corrosion sensor is unqualified.
Preferably, when the anode of said galvanic atmospheric corrosion sensor is made of zinc, said first predetermined range is 0.1nA/cm2Hereinafter, the second predetermined range is 0.1 to 1nA/cm2And the third predetermined range is 5-20nA/cm2The fourth predetermined range is 300-800nA/cm2。
Preferably, when the positive of said galvanic atmospheric corrosion sensorWhen the pole is made of aluminum, said first predetermined range is 0.02nA/cm2Hereinafter, the second predetermined range is 0.02 to 0.2nA/cm2And the third predetermined range is 1 to 3nA/cm2And the fourth predetermined range is 50-130nA/cm2。
Preferably, when the anode of said galvanic atmospheric corrosion sensor is made of copper, said first predetermined range is 0.05nA/cm2Hereinafter, the second predetermined range is 0.05 to 1nA/cm2And the third predetermined range is 2-10nA/cm2The fourth predetermined range is 200-600nA/cm2。
Preferably, when the anode of said galvanic atmospheric corrosion sensor is made of steel, said first predetermined range is 3nA/cm2Hereinafter, the second predetermined range is 3 to 25nA/cm2The third predetermined range is 100-500nA/cm2The fourth predetermined range is 6000-2。
Preferably, when the anode of the couple atmospheric corrosion sensor is made of zinc, if in step 2b) of step 2), a corrosion current density value of 0.5nA/cm is detected at 25 ℃ and 50% RH + -3% RH2And continuing to carry out the step 2c), otherwise, judging that the galvanic couple type atmospheric corrosion sensor is unqualified.
Preferably, when the anode of the couple atmospheric corrosion sensor is made of zinc, if in step 2c) of step 2), a corrosion current density value of 10nA/cm is detected at 25 ℃ and 80% RH + -3% RH2And D), continuing to carry out the step 2d), otherwise, judging that the galvanic couple type atmospheric corrosion sensor is unqualified.
Preferably, when the anode of the couple atmospheric corrosion sensor is made of zinc, if in step 2d) of step 2), a corrosion current density value of 400nA/cm is detected at 25 ℃ and 98% RH + -3% RH2And continuing to carry out the step 3), otherwise, judging that the galvanic couple type atmospheric corrosion sensor is unqualified.
Preferably, in the step 2), the corrosion current value density of the couple atmospheric corrosion sensor is detected in a temperature and humidity alternating box, and the temperature and humidity alternating box can provide various required temperature and humidity conditions.
Preferably, the precision of the temperature and humidity alternating box for controlling the humidity is within 5 percent, and the precision of the temperature control is +/-1.5 ℃.
Preferably, in step 3), the detected change of the corrosion current value of the couple atmospheric corrosion sensor with the humidity change includes whether the corrosion current value increases with the humidity increase or decreases with the humidity decrease and whether the response of the corrosion current value to the humidity change is timely.
Preferably, in the step 3), a high-precision temperature and humidity sensor is placed in close proximity to the galvanic couple type atmospheric corrosion sensor, the humidity detection is synchronously performed while the corrosion current value of the galvanic couple type atmospheric corrosion sensor is detected, and the corrosion current value of the galvanic couple type atmospheric corrosion sensor is analyzed and judged according to the detected corrosion current value and humidity, wherein the corrosion current value and the humidity are in a relationship of: lg i ═ a + (b × RH) at 25 ℃, where i is the current in nA; a and b are constants associated with the material used for the anode of the couple atmospheric corrosion sensor, and a and b correspond to those shown in the following table when the material used for the anode is zinc, aluminum, copper or steel,
| material of | a | b |
| Zinc | -1.650 | 0.0333 |
| Aluminium | -4.125 | 0.0625 |
| Copper (Cu) | -4.377 | 0.0644 |
| Steel | -0.659 | 0.0392 |
(ii) a RH is the percentage of relative humidity.
Preferably, when the anode material of the galvanic couple type atmospheric corrosion sensor is zinc and the response time of the corrosion current to the humidity change is not more than 1s, the galvanic couple type atmospheric corrosion sensor is judged to be in time in response to the humidity change, and the galvanic couple type atmospheric corrosion sensor is judged to be qualified.
The invention has the beneficial effects that: the quality of the galvanic couple type atmospheric corrosion sensor can be rapidly detected in batches under the same controlled condition, the sensitivity, the precision and the consistency of the corrosion sensor are ensured, the accuracy and the credibility of the result when the galvanic couple type atmospheric corrosion sensor is used for detecting the atmospheric corrosion are further ensured, and the comparability requirements of corrosion evaluation results in different regions are met.
Drawings
FIG. 1 is a flow chart of a method of detecting a galvanic atmospheric corrosion sensor in accordance with an embodiment of the present invention.
FIG. 2 is a graph of data obtained from an atmospheric corrosion sensor in accordance with an embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
The method for detecting the galvanic couple type atmospheric corrosion sensor comprises the following steps: step S1: measuring the insulation resistance value between the cathode and the anode of the galvanic couple type atmospheric corrosion sensor, preliminarily judging whether the galvanic couple type atmospheric corrosion sensor is effective or not based on the insulation resistance value, and if the galvanic couple type atmospheric corrosion sensor is preliminarily judged to be effective, continuing to perform the following step S2; step S2: detecting and recording the corrosion current value of the couple atmospheric corrosion sensor under the conditions of room temperature and various humidities, judging whether the detected corrosion current value is in a preset range, and if so, continuing to perform the following step S3; and step S3: and detecting the corrosion current of the couple atmospheric corrosion sensor changing along with the humidity change.
A flow chart of a method for detecting a galvanic atmospheric corrosion sensor in accordance with an embodiment of the present invention is shown in fig. 1. Wherein, in step S1, the insulation resistance value between the cathode and the anode of the couple atmospheric corrosion sensor is measured by using a multimeter under the conditions of room temperature and 10% -50% of relative humidity. In step S1, if the insulation resistance value between the cathode and the anode of the galvanic couple atmospheric corrosion sensor is greater than or equal to 1K Ω, the galvanic couple atmospheric corrosion sensor is preliminarily determined to be effective. Preferably, in step S1, if the insulation resistance value between the cathode and the anode of the galvanic atmospheric corrosion sensor is 80M Ω at 25 ℃ and 30% RH, the galvanic atmospheric corrosion sensor is preliminarily judged to be effective.
In step S2, the galvanic atmospheric corrosion sensor is connected to an electrochemical workstation or a picoammeter with an accuracy of 0.01nA or more, so that the corrosion current value of the galvanic atmospheric corrosion sensor can be continuously and accurately detected and recorded.
As shown in fig. 1, step S2 further includes steps S2a, S2b, S2c and S2d, wherein:
at step S2 a: detecting whether the corrosion current density value is in a first preset range or not under the conditions of 25 ℃ and 10% -50% RH, if so, continuing to perform the following step S2b, otherwise, judging that the galvanic couple type atmospheric corrosion sensor is unqualified;
step S2 b: detecting whether the corrosion current density value is in a second preset range or not under the conditions of 25 ℃ and 50% RH +/-3% RH, if so, continuing to perform the following step S2c, otherwise, judging that the galvanic atmospheric corrosion sensor is unqualified;
step S2 c: detecting whether the corrosion current density value is in a third preset range or not under the conditions of 25 ℃ and 80% RH +/-3% RH, if so, continuing to perform the following step S2d, otherwise, judging that the galvanic atmospheric corrosion sensor is unqualified;
step S2 d: and detecting whether the corrosion current density value is in a fourth preset range or not under the conditions of 25 ℃ and 98% RH +/-3% RH, if so, continuing to perform the step S3, otherwise, judging that the galvanic atmospheric corrosion sensor is unqualified.
When the anode of the galvanic atmospheric corrosion sensor is made of zinc, the first predetermined range is 0.1nA/cm2Hereinafter, the above-mentioned second predetermined range is 0.1 to 1nA/cm2The third predetermined range is 5 to 20nA/cm2The fourth predetermined range is 300-800nA/cm2。
When the anode of the galvanic atmospheric corrosion sensor is made of aluminum, the first predetermined range is 0.02nA/cm2Hereinafter, the above-mentioned second predetermined range is 0.02 to 0.2nA/cm2The third predetermined range is 1 to 3nA/cm2The fourth predetermined range is 50 to 130nA/cm2。
Preferably, in step S2b of step S2, if the corrosion current density value is detected as the first predetermined value under the conditions of 25 ℃ and 50% RH ± 3% RH, the step S2c is continued, otherwise the galvanic atmospheric corrosion sensor is determined to be not qualified.
Preferably, in step S2c of step S2, under the conditions of 25 ℃ and 80% RH ± 3% RH, if the corrosion current density value is detected to be the second predetermined value, step S2d is continued, otherwise the galvanic atmospheric corrosion sensor is determined to be not qualified.
Preferably, in step S2d of step S2, under the conditions of 25 ℃ and 98% RH ± 3% RH, if the corrosion current density value is detected to be a third predetermined value, the process proceeds to step S3, otherwise, the galvanic atmospheric corrosion sensor is determined to be unqualified.
Preferably, in step S2, the galvanic couple atmospheric corrosion sensor is subjected to corrosion current value density detection in an alternating temperature and humidity box, which can provide various temperature and humidity conditions as required. Preferably, the control precision of the temperature and humidity alternating box to humidity is within 5%, and the control precision to temperature is +/-1.5 ℃.
Preferably, in step S3, the detected changes of the corrosion current value of the couple atmospheric corrosion sensor with changes in humidity include whether the corrosion current value increases with increases in humidity or decreases with decreases in humidity and whether the corrosion current value responds to changes in humidity in time.
In the step S3, a high-precision temperature and humidity sensor is placed in close proximity to the galvanic atmospheric corrosion sensor, the corrosion current value of the galvanic atmospheric corrosion sensor is detected, and simultaneously the humidity is synchronously detected by the high-precision temperature and humidity sensor, and the change of the corrosion current value with the change of the humidity is analyzed and judged based on the detected corrosion current value and the detected humidity. The corrosion current value as a function of humidity at 25 ℃ is: lg i ═ a + (b × RH), where i is the current in nA; a and b are constants associated with the material used for the anode of the galvanic atmospheric corrosion sensor, and a and b are shown in table 1 below when the material used for the anode is zinc, aluminum, copper or steel; RH is the percentage of relative humidity.
TABLE 1
| Material of | a | b |
| Zinc | -1.650 | 0.0333 |
| Aluminium | -4.125 | 0.0625 |
| Copper (Cu) | -4.377 | 0.0644 |
| Steel | -0.659 | 0.0392 |
In the step 3), when the response time of the corrosion current value of the couple atmospheric corrosion sensor to the humidity change is not more than 1s, judging that the response of the couple atmospheric corrosion sensor to the humidity change is timely, and further judging that the couple atmospheric corrosion sensor is qualified.
In order to rapidly perform batch detection on the couple atmospheric corrosion sensor, the detection method of the present application is preferably implemented in a temperature and humidity alternating box which can provide stable and consistent temperature and humidity conditions.
Fig. 1 shows a detailed process for detecting the couple atmospheric corrosion sensor under the humidity condition provided by an alternating temperature and humidity box.
As shown in fig. 1, first, the insulation resistance value of the couple atmospheric corrosion sensor to be detected is detected, and whether the couple atmospheric corrosion sensor is effective or not is preliminarily determined based on the detected insulation resistance value. Insulation resistance between the anode and cathode of the galvanic atmospheric corrosion sensor was measured using a multimeter in a laboratory environment, i.e., at 25 ℃ and 30% RH. Specifically, the anode of the multimeter is connected with the anode of the couple type atmospheric corrosion sensor, the other pole of the multimeter is connected with the cathode of the couple type atmospheric corrosion sensor, and the detected insulation resistance value is 80M omega.
And then, detecting the corrosion current of the couple atmospheric corrosion sensor in a temperature and humidity alternating box under different humidity conditions. The temperature and humidity alternating test box can generate different temperature and humidity environments and is used for changing atmospheric corrosivity. Because the relative humidity has a large influence on the atmospheric corrosivity, the temperature in the temperature and humidity alternating box is stabilized at 25 ℃, and the atmospheric corrosivity is changed by adjusting the humidity. The humiture alternating box generally provides humidity condition through shallow water dish, steam or water spray's mode, and the state that humidity is inhomogeneous may exist in the box, and galvanic couple type atmospheric corrosion sensor is extremely sensitive to the humidity in the environment, and the humiture precision of alternating test case is 5% in addition, so place the high accuracy humiture sensor that the precision can reach 1% in the position of being close to galvanic couple type atmospheric corrosion sensor.
And (3) placing a couple atmospheric corrosion sensor to be detected in the temperature and humidity alternating box, connecting lead wires of two poles of the couple atmospheric corrosion sensor with a high-precision current detection device with the precision of more than 0.01nA, such as an electrochemical workstation or a picoammeter, and starting to detect the corrosion current after the temperature and humidity alternating box is started and operates stably for more than 1h, preferably 2 h. The electrochemical workstation suitable for this application preferably has high quality, high stability, high resolution, high sampling rate, can be used directly for steady-state current measurement on the ultramicroelectrode, and is connected with a micro-current amplifier and a shielding box, and can measure a current of 1pA or less.
Next, adjusting the internal space of the temperature and humidity alternating box to ensure that the humidity is 10% -50% RH, detecting the corrosion current density value of the galvanic couple type atmospheric corrosion sensor after the temperature and the humidity are stably maintained for half an hour, and if the corrosion current density value is detected to be 0.1nA/cm2And continuing the method to the next step, otherwise, judging that the galvanic couple type atmospheric corrosion sensor is unqualified, and ending the detection process.
Next, adjusting the humidity of the inner space of the temperature and humidity alternating box to 50% RH +/-3% RH, after the temperature and the humidity are stably maintained for half an hour, detecting the corrosion current density value of the galvanic couple type atmospheric corrosion sensor by using an electrochemical workstation or a picoampere meter, and if the corrosion current density value is detectedUntil the corrosion current density value is 0.1-1nA/cm2If so, the method continues to the next step, otherwise, the galvanic atmospheric corrosion sensor is judged to be unqualified, and the detection process is ended.
Next, adjusting the humidity of the inner space of the temperature and humidity alternating box to 80% RH +/-3% RH, after the temperature and the humidity are stably maintained for half an hour, detecting the corrosion current density value of the galvanic couple type atmospheric corrosion sensor by using an electrochemical workstation or a picoampere meter, and if the corrosion current density value is detected to be 5-20nA/cm2And if not, judging that the galvanic couple type atmospheric corrosion sensor is unqualified, and ending the detection process.
Then, the humidity of the inner space of the temperature and humidity alternating box is adjusted to 98% RH +/-3% RH, after the temperature and the humidity are stably maintained for half an hour, the corrosion current density value of the galvanic couple type atmospheric corrosion sensor is detected by using an electrochemical workstation or a picoammeter, and if the corrosion current density value is detected to be 300 plus 800nA/cm2And if not, judging that the galvanic couple type atmospheric corrosion sensor is unqualified, and ending the detection process.
As mentioned above, the high-precision temperature and humidity sensor is placed in the temperature and humidity alternating box and in the position close to the couple type atmospheric corrosion sensor to be detected, so that the humidity data of the environment where the couple type atmospheric corrosion sensor is located can be monitored and recorded by the high-precision temperature and humidity sensor while the corrosion current value of the couple type atmospheric corrosion sensor is detected and recorded. Based on the detected and recorded corrosion current value data of the couple atmospheric corrosion sensor and the humidity data monitored and recorded by the high-precision temperature and humidity sensor, the condition that the corrosion current of the couple atmospheric corrosion sensor changes along with the humidity change and the response condition of the corrosion current to the humidity change can be analyzed and judged. Theoretically, the corrosion current value of a qualified couple atmospheric corrosion sensor increases along with the increase of humidity and decreases along with the decrease of humidity, the follow-up property is good, and the response speed is preferably not more than 1 s.
The technical solution of the present application is further described below by two specific examples.
Example 1
In this embodiment, the anode of the galvanic atmospheric corrosion sensor is made of metallic zinc and the cathode is made of metallic platinum. The galvanic couple type atmospheric corrosion sensor is structurally in an interval mode that cathodes and anodes are alternately arranged, and the cathodes and the anodes are respectively provided with leads. The electrode area is 10cm2。
First, the insulation resistance between the anode and the cathode of the couple atmospheric corrosion sensor was measured at 25 ℃ and 30% RH using a multimeter. The anode of the multimeter is connected with the anode of the couple atmospheric corrosion sensor, the other pole of the multimeter is connected with the cathode of the couple atmospheric corrosion sensor, and the couple atmospheric corrosion sensor is preliminarily judged to be effective when the resistance value is detected to be 80 MOmega.
Next, in the temperature and humidity alternating box described above, corrosion current detection is performed on the couple atmospheric corrosion sensor preliminarily judged to be effective. And (3) putting the couple atmospheric corrosion sensor to be detected into a temperature and humidity alternating box, connecting leads of two poles of the couple atmospheric corrosion sensor with an electrochemical workstation with the precision of more than 0.01nA, and simultaneously placing a high-precision temperature and humidity sensor at a position close to the couple atmospheric corrosion sensor. And starting to detect the corrosion current after the temperature and humidity alternating box is started and operates stably for 2 h.
Then, the corrosion current value of the galvanic couple type atmospheric corrosion sensor at 25 ℃ and 10% -50% RH is detected. Adjusting the internal space of the temperature and humidity alternating box to ensure that the humidity is 10-50% RH, detecting the corrosion current density value of the galvanic couple type atmospheric corrosion sensor after the temperature and the humidity are stably maintained for half an hour, and detecting that the corrosion current density value is 0.1nA/cm2The method then proceeds to the next step.
Then, the humidity of the inner space of the temperature and humidity alternating box is adjusted to 50% RH +/-3% RH, after the temperature and the humidity are stably maintained for half an hour, the corrosion current density value of the galvanic couple type atmospheric corrosion sensor is detected by using an electrochemical workstation, and the corrosion current density value is detected to be 0.5nA/cm2The method continues to the next step。
And then, adjusting the humidity of the inner space of the temperature and humidity alternating box to 80% RH +/-3% RH, after the temperature and the humidity are stably maintained for half an hour, detecting the corrosion current density value of the galvanic couple type atmospheric corrosion sensor by using an electrochemical workstation, and detecting that the corrosion current density value is 10nA/cm2The method continues to the next step.
Then, adjusting the humidity of the inner space of the temperature and humidity alternating box to 98% RH +/-3% RH, after the temperature and the humidity are stably maintained for half an hour, detecting the corrosion current density value of the galvanic couple type atmospheric corrosion sensor by using an electrochemical workstation or a picoampere meter, and detecting that the corrosion current density value is 400nA/cm2The method continues to the next step.
When the corrosion current is detected under the above conditions, the temperature and humidity sensor placed in the inner space of the temperature and humidity alternating box synchronously detects and records the humidity. And analyzing and judging the condition that the corrosion current of the galvanic couple type atmospheric corrosion sensor changes along with the humidity change and the response condition of the corrosion current to the humidity change based on the detected and recorded corrosion current value data of the galvanic couple type atmospheric corrosion sensor and the humidity data monitored and recorded by the high-precision temperature and humidity sensor.
The results shown in fig. 2 indicate that the corrosion current of the couple atmospheric corrosion sensor detected in the present embodiment increases with the increase of humidity, the follow-up performance is good, and the response time of the corrosion current to the humidity change in the test process does not exceed 1 s. At a relative humidity of 50%, a corrosion current value of 5nA was detected, and a corresponding corrosion current density value was 0.5nA/cm2The corrosion current density value at a relative humidity of 80% is 10nA/cm2The corrosion current density value at the relative humidity of 98 percent is 400nA/cm2And detecting that the corrosion current density value is in a preset range under each humidity condition, so that the galvanic couple type atmospheric corrosion sensor is judged to be qualified.
Example 2
In this embodiment, the anode of the galvanic atmospheric corrosion sensor is made of metallic aluminum and the cathode is made of metallic aluminumIs made of metallic gold. The galvanic couple type atmospheric corrosion sensor is structurally in an interval mode that cathodes and anodes are alternately arranged, and the cathodes and the anodes are respectively provided with leads. The electrode area is 10cm2。
First, the insulation resistance between the anode and the cathode of the couple type atmospheric corrosion sensor was measured at 25 ℃ and 30% RH using a multimeter. The anode of the multimeter is connected with the anode of the couple atmospheric corrosion sensor, the other pole of the multimeter is connected with the cathode of the couple atmospheric corrosion sensor, the resistance value is detected to be 20 MOmega, and the couple atmospheric corrosion sensor is preliminarily judged to be effective.
Next, in the temperature and humidity alternating box described above, corrosion current detection is performed on the couple atmospheric corrosion sensor preliminarily judged to be effective. And (3) putting the couple atmospheric corrosion sensor to be detected into a temperature and humidity alternating box, connecting leads of two poles of the couple atmospheric corrosion sensor with an electrochemical workstation with the precision of more than 0.01nA, and simultaneously placing a high-precision temperature and humidity sensor at a position close to the couple atmospheric corrosion sensor. And starting to detect the corrosion current after the temperature and humidity alternating box is started and operates stably for 2 h.
And detecting the corrosion current of the galvanic couple type atmospheric corrosion sensor at 25 ℃ and 10-50% RH. Adjusting the internal space of the temperature and humidity alternating box to enable the humidity to be 10% -50% RH, and detecting the corrosion current density value of the galvanic couple type atmospheric corrosion sensor after the temperature and the humidity are stably maintained for half an hour. The detected corrosion current density value is 0.02nA/cm2The method then proceeds to the next step.
Then, the humidity of the inner space of the temperature and humidity alternating box is adjusted to 50% RH +/-3% RH, after the temperature and the humidity are stably maintained for half an hour, the corrosion current density value of the galvanic couple type atmospheric corrosion sensor is detected by using an electrochemical workstation, and the corrosion current density value is detected to be 0.1nA/cm2The method continues to the next step.
Then, the humidity of the inner space of the temperature and humidity alternating box is adjusted to 80% RH +/-3% RH, and after the temperature and the humidity are stably maintained for half an hour, electricity is detected by using an electrochemical workstationThe corrosion current density value of the even atmospheric corrosion sensor is 2nA/cm2The method continues to the next step.
Then, adjusting the humidity of the inner space of the temperature and humidity alternating box to 98% RH +/-3% RH, after the temperature and the humidity are stably maintained for half an hour, detecting the corrosion current density value of the galvanic couple type atmospheric corrosion sensor by using an electrochemical workstation or a picoampere meter, and detecting that the corrosion current density value is 80nA/cm2The method continues to the next step.
When the corrosion current is detected under the above conditions, the temperature and humidity sensor placed in the inner space of the temperature and humidity alternating box synchronously detects and records the humidity. And analyzing and judging the condition that the corrosion current of the galvanic couple type atmospheric corrosion sensor changes along with the humidity change and the response condition of the corrosion current to the humidity change based on the detected and recorded corrosion current value data of the galvanic couple type atmospheric corrosion sensor and the humidity data monitored and recorded by the high-precision temperature and humidity sensor. The corrosion current of the couple atmospheric corrosion sensor detected in the embodiment is increased along with the increase of humidity, the follow-up property is good, and the response time of the corrosion current to the humidity change in the test process is not more than 1 s. The current density value detected under each relative humidity condition is in a preset range, so that the galvanic couple type atmospheric corrosion sensor is judged to be qualified.
While the embodiments of the present invention have been illustrated and described in detail in the drawings and described above, it will be understood by those skilled in the art that the embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader better understand the spirit of the present invention and is not intended to limit the scope of the present invention, but rather, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (16)
1. A method for detecting a galvanic atmospheric corrosion sensor, the method comprising:
step 1): measuring the insulation resistance value between the cathode and the anode of the galvanic couple type atmospheric corrosion sensor by using a universal meter, preliminarily judging whether the galvanic couple type atmospheric corrosion sensor is effective or not based on the insulation resistance value, and if the galvanic couple type atmospheric corrosion sensor is preliminarily judged to be effective, continuing to perform the following step 2);
step 2): detecting and recording the corrosion current value of the couple atmospheric corrosion sensor under the conditions of room temperature and various humidities, judging whether the detected corrosion current value is in a preset range, and if so, continuing to perform the following step 3); the step 2 comprises the following steps:
step 2 a): detecting whether the corrosion current density value is in a first preset range or not under the conditions of 25 ℃ and 10% -50% RH, if so, continuing to perform the following step 2b), otherwise, judging that the galvanic atmospheric corrosion sensor is unqualified;
step 2 b): detecting whether the corrosion current density value is in a second preset range or not under the conditions of 25 ℃ and 50% RH +/-3% RH, if so, continuing to perform the following step 2c), otherwise, judging that the galvanic couple type atmospheric corrosion sensor is unqualified;
step 2 c): detecting whether the corrosion current density value is in a third preset range or not under the conditions of 25 ℃ and 80% RH +/-3% RH, if so, continuing to perform the following step 2d), otherwise, judging that the galvanic couple atmospheric corrosion sensor is unqualified;
step 2 d): detecting whether the corrosion current density value is in a fourth preset range or not under the conditions of 25 ℃ and 98% RH +/-3% RH, if so, continuing to perform the step 3), otherwise, judging that the galvanic atmospheric corrosion sensor is unqualified; and
step 3): detecting and analyzing the change condition of the corrosion current value of the galvanic couple type atmospheric corrosion sensor along with the change of humidity; the method comprises the following steps of placing a high-precision temperature and humidity sensor close to the couple atmospheric corrosion sensor, synchronously detecting the corrosion current value of the couple atmospheric corrosion sensor and simultaneously detecting the humidity, and analyzing and judging the change condition of the corrosion current value of the couple atmospheric corrosion sensor along with the change of the humidity based on the detected corrosion current value and the humidity, wherein the relation between the corrosion current value and the humidity is as follows:
at the temperature of 25 ℃, the temperature of the mixture is controlled,
lg i＝a+(b×RH)
wherein i is current in nA; a and b are constants related to the anode material of the couple atmospheric corrosion sensor, and a and b are shown in the following table when the anode material is zinc, aluminum, copper or steel,
RH is the percentage of relative humidity.
2. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: in step 1), the insulation resistance value is measured using a multimeter at room temperature under conditions of a relative humidity of 10% to 50%.
3. A method for detecting a galvanic atmospheric corrosion sensor according to claim 2, wherein: when the anode of the galvanic couple type atmospheric corrosion sensor is made of zinc, if the insulation resistance value is measured to be greater than or equal to 1K Ω in the step 1), the galvanic couple type atmospheric corrosion sensor is preliminarily judged to be effective.
4. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: when the anode of the couple atmospheric corrosion sensor is made of zinc, if the insulation resistance value is 80 MOmega measured under the conditions of 25 ℃ and 30% RH in the step 1), the couple atmospheric corrosion sensor is preliminarily judged to be effective.
5. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: in step 2), the galvanic atmospheric corrosion sensor is connected to an electrochemical workstation or a picoampere meter with the accuracy of more than 0.01nA, so that the corrosion current value of the galvanic atmospheric corrosion sensor can be continuously and accurately detected and recorded.
6. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: when the anode of the couple atmospheric corrosion sensor is made of zinc, the first predetermined range is 0.1nA/cm2Hereinafter, the second predetermined range is 0.1 to 1nA/cm2And the third predetermined range is 5-20nA/cm2The fourth predetermined range is 300-800nA/cm2。
7. A method according to claim 1 for detecting galvanic atmospheric corrosionA method of a sensor, characterized by: when the anode of the galvanic atmospheric corrosion sensor is made of aluminum, the first predetermined range is 0.02nA/cm2Hereinafter, the second predetermined range is 0.02 to 0.2nA/cm2And the third predetermined range is 1 to 3nA/cm2And the fourth predetermined range is 50-130nA/cm2。
8. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: when the anode of the galvanic atmospheric corrosion sensor is made of copper, the first predetermined range is 0.05nA/cm2Hereinafter, the second predetermined range is 0.05 to 1nA/cm2And the third predetermined range is 2-10nA/cm2The fourth predetermined range is 200-600nA/cm2。
9. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: when the anode of the couple atmospheric corrosion sensor is made of steel, the first predetermined range is 3nA/cm2Hereinafter, the second predetermined range is 3 to 25nA/cm2The third predetermined range is 100-500nA/cm2The fourth predetermined range is 6000-2。
10. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: when the anode of the couple atmospheric corrosion sensor is made of zinc, if in step 2b) of step 2), a corrosion current density value of 0.5nA/cm is detected at 25 ℃ and 50% RH + -3% RH2And continuing to carry out the step 2c), otherwise, judging that the galvanic couple type atmospheric corrosion sensor is unqualified.
11. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: when the anode of the couple atmospheric corrosion sensor is made of zinc, if in step 2c) of step 2), 80% RH + -3% at 25 deg.CUnder the condition of RH, the corrosion current density value is detected to be 10nA/cm2And D), continuing to carry out the step 2d), otherwise, judging that the galvanic couple type atmospheric corrosion sensor is unqualified.
12. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: when the anode of the couple atmospheric corrosion sensor is made of zinc, if in the step 2d) of the step 2), a corrosion current density value of 400nA/cm is detected under the conditions of 25 ℃ and 98% RH +/-3% RH2And continuing to carry out the step 3), otherwise, judging that the galvanic couple type atmospheric corrosion sensor is unqualified.
13. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: in the step 2), carrying out corrosion current value density detection on the couple atmospheric corrosion sensor in a temperature and humidity alternating box, wherein the temperature and humidity alternating box can provide various required temperature and humidity conditions.
14. A method for detecting a galvanic atmospheric corrosion sensor according to claim 13, wherein: the precision of the temperature and humidity alternating box to humidity control is within 5%, and the precision to temperature control is +/-1.5 ℃.
15. A method for detecting a galvanic atmospheric corrosion sensor according to claim 1, wherein: the condition that the corrosion current value of the couple atmospheric corrosion sensor changes along with the change of humidity comprises whether the corrosion current value increases along with the increase of humidity or decreases along with the decrease of humidity and whether the response of the corrosion current to the change of humidity is timely.
16. A method for detecting a galvanic atmospheric corrosion sensor according to claim 15, wherein: when the anode material of the galvanic couple type atmospheric corrosion sensor is zinc and the response time of the corrosion current to the humidity change is not more than 1s, judging that the response of the galvanic couple type atmospheric corrosion sensor to the humidity change is in time, and further judging that the galvanic couple type atmospheric corrosion sensor is qualified.
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