CN113340800A - Corrosion resistance test method for carbon steel - Google Patents
Corrosion resistance test method for carbon steel Download PDFInfo
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- CN113340800A CN113340800A CN202110644494.7A CN202110644494A CN113340800A CN 113340800 A CN113340800 A CN 113340800A CN 202110644494 A CN202110644494 A CN 202110644494A CN 113340800 A CN113340800 A CN 113340800A
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- 229910000975 Carbon steel Inorganic materials 0.000 title claims abstract description 69
- 238000005260 corrosion Methods 0.000 title claims abstract description 63
- 230000007797 corrosion Effects 0.000 title claims abstract description 63
- 239000010962 carbon steel Substances 0.000 title claims abstract description 62
- 238000010998 test method Methods 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 claims abstract description 117
- 150000003839 salts Chemical class 0.000 claims abstract description 62
- 239000007921 spray Substances 0.000 claims abstract description 55
- 238000001035 drying Methods 0.000 claims abstract description 25
- 238000001694 spray drying Methods 0.000 claims abstract description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 20
- 239000012266 salt solution Substances 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 11
- 239000011780 sodium chloride Substances 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 7
- 238000004062 sedimentation Methods 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 4
- 239000013535 sea water Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 14
- 238000004088 simulation Methods 0.000 abstract description 7
- 238000009736 wetting Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 26
- 230000008569 process Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000010219 correlation analysis Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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Abstract
The invention relates to a corrosion resistance test method of carbon steel. The corrosion resistance test method of the carbon steel adopts an intermittent salt spray test, and carries out a salt spray-drying cycle test by taking 48 hours as a period under the conditions that the temperature is 48-53 ℃ and the proportion of the wetting time is 70-80%; the salt spray time is 34-38 hours, the drying time is 10-14 hours, the intermittent salt spray test is performed for at least 6 cycles, and the total time of the test is 288-290 hours. The method for testing the corrosion performance of the carbon steel is coupled with three corrosion environment effects of high temperature, high-concentration salt spray and drying, and can better simulate the influence of temperature, alternation of wetting and drying and salt spray on the corrosion performance of the carbon steel in the marine atmospheric environment. Compared with the current MIL-STD-810G (GJB150.11A) standard, the method has higher acceleration and simulation, and can more accurately evaluate the adaptability and reliability of the carbon steel in the marine environment.
Description
Technical Field
The invention relates to the technical field of accelerated simulation tests, in particular to a corrosion resistance testing method of carbon steel in coastal areas with high temperature, high humidity and high chloride ion sedimentation amount.
Background
Carbon steel is used as the most widely used structural material, serious corrosion problems are inevitable, and in addition, the carbon steel is often used as the main material for evaluating the comparative material and the environmental corrosivity grade, so the accumulation of the corrosion data is necessary. At present, basic and systematic quantitative data are lacked, and a correlation model is difficult to establish and the adaptability, reliability and service life prediction of the metal material in the harsh marine atmosphere environment are difficult to evaluate. If the corrosion resistance of a carbon steel system can be evaluated quickly and accurately, effective protective measures can be taken for the carbon steel more pertinently, and important support is provided for the future maintenance and improvement of related products.
At present, test methods for evaluating the corrosion resistance of carbon steel mainly comprise a natural exposure test method and a laboratory simulation accelerated test method. The main disadvantages of the natural exposure test are high regionality, long test period and high cost. Most of the existing laboratory simulation accelerated test methods are complex in accelerated test operation, and carbon steel and military products (materials) are mostly detected by using standard detection methods such as GJB150.11A, GB/T10125. The detection methods belong to the universal salt spray test standard, the correlation between the result of the acceleration test and the result of the natural exposure test is poor, the acceleration multiplying power is small, the test period is relatively long, and the corrosion resistance test of the carbon steel in coastal areas is not facilitated.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for testing the corrosion resistance of carbon steel with simple operation, large acceleration multiple and good simulation for the existing detection method and application thereof.
A corrosion resistance test method of carbon steel is used for evaluating the corrosion resistance of the carbon steel in coastal areas with high temperature, high humidity and high chloride ion sedimentation amount, and is characterized in that: carrying out 6-period high-concentration salt spray-drying composite test on the sample by taking 48 hours as one period;
the salt spray test comprises a salt spray test and a drying test which are alternately carried out, the salt spray test and the drying test are respectively carried out for at least 6 times, the total time of the salt spray test is 280-290 hours, and the specific operation steps of the salt spray test are as follows: spraying 5-7% (wt.%) of salt solution to the sample at 48-53 ℃, wherein the pH value of the salt solution is 6.5-7.2, and the settling amount of the salt solution is 1.5mL/(80 cm)2·h)～ 3.0mL/(80cm2H), the time of salt spray is 34-38 hours, and the specific operation of the drying test is as follows; drying the sample subjected to the salt spray test at 48-53 ℃ for 10-14 DEG CAnd (4) hours.
Furthermore, the high-concentration salt spray-drying composite test of 1 period can simulate the field corrosion environment of the carbon steel in the coastal region for 456 to 584 days.
Furthermore, the proportion of the wetting time is 70-80%, and the time of the salt spray test is longer than that of the drying test.
Further, the salt spray test comprises 6 times of the salt spray test and 6 times of the drying test, and the specific operation of the salt spray test is as follows: spraying a salt solution with the percentage content of 7% on a sample at the temperature of 48-53 ℃, wherein the salt solution is a sodium chloride solution, the pH value of the salt solution is 6.5-7.2, and the settling amount of the salt solution is 1.5mL/(80 cm)2·h)～3.0mL/(80cm2H), wherein the salt spray time is 34-38 hours.
Further, the specific operation of the drying test is as follows: and drying the sample subjected to the salt spray test at 48-53 ℃ for 10-14 hours.
Further, the salt solution is at least one selected from the group consisting of a sodium chloride solution, test seawater and artificial seawater.
Further, the sample is mainly carbon steel material Q235 and the like, but is not limited to carbon steel.
The method for testing the corrosion resistance of the carbon steel is simple to operate, can better simulate the corrosion process of the metal material in the marine atmospheric environment, and greatly shortens the test period.
The invention has the advantages that:
according to the invention, through a high-concentration salt spray-drying alternate cycle test, the influence of different environments such as chloride ion sedimentation amount, temperature, dry-wet alternate and the like on the corrosion resistance of the carbon steel can be simulated, the process is simplified, the time is saved and the cost is reduced. Meanwhile, the result of the corrosion resistance test method for the carbon steel has good correlation with the result of a natural exposure test, the correlation coefficient expressed by the corrosion depth is 0.64, and the simulation is good; compared with a natural exposure test, the acceleration multiple of the corrosion resistance test method of the carbon steel can reach 292 times, the acceleration is obvious, and the test period is greatly shortened.
Compared with the conventional GJB150.11A standard, the acceleration multiplying factor is 3 times that of the standard. Moreover, the influence of different environmental factors on the corrosion resistance of the carbon steel can be simulated by adjusting the temperature, the concentration of the salt solution and the like of the salt spray test, and the applicability and the operability are strong.
In addition, the salt spray testing method can be automatically completed by arranging the commercial salt spray box with the salt spray-drying composite testing function in a general process sequence, the sample does not need to be transferred between the salt spray box and the drying box in the testing process, the operation is simple, and the testing process is simplified.
Drawings
FIG. 1 is a composite test procedure for corrosion resistance evaluation of carbon steel in marine areas;
fig. 2 is a graph showing the change of the etching depth with time of comparative example 1.
Fig. 3 is a graph of the etch depth as a function of time for example 1 and comparative example 2.
Detailed Description
In order to facilitate an understanding of the invention, a more complete description of the invention will now be rendered by reference to the appended drawings. It is to be understood that the described embodiments are merely illustrative of some, but not all, of the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1, an embodiment of a corrosion resistance test method for carbon steel, for evaluating corrosion resistance of carbon steel, employs a salt spray test for at least 6 cycles. The corrosion resistance testing method of the carbon steel can be applied to the accelerated corrosion of carbon steel samples under the simulated marine atmospheric environment.
The present invention will be further described with reference to the following specific examples.
Example 1
1. Test subjects: q235 carbon steel
2. Experimental arrangement: the samples were subjected to an intermittent salt spray test in a cycle of 48 hours with a wetting time ratio of 75%, and the salt spray test and the drying test were each performed 6 times.
3. The specific operation of the test:
(1) the salt spray test comprises the following specific operations: spraying salt spray on the sample at 50 ℃ for 36 hours, wherein the pH value is 6.5, the mass percentage content of the sodium chloride solution is 7%, and the sedimentation amount of the sodium chloride solution is 2.0mL/(80 cm)2·h)
(2) The specific operation of the drying test was: the 36 hour salt spray samples were dried at 50 ℃ for 12 hours.
Example 2
1. Test subjects: q235 carbon steel
2. Experimental arrangement: the samples were subjected to an intermittent salt spray test in a cycle of 48 hours with a wetting time ratio of 70%, and the salt spray test and the drying test were each performed 6 times.
3. The specific operation of the test:
(1) the salt spray test comprises the following specific operations: spraying salt spray on the sample at 48 ℃ for 34 hours, wherein the pH value is 6.7, the mass percentage content of the sodium chloride solution is 5%, and the sedimentation amount of the sodium chloride solution is 1.5mL/(80 cm)2·h)
(2) The specific operation of the drying test was: samples tested for 34 hours in the salt spray test were dried at 50 ℃ for 14 hours.
Example 3
1. Test subjects: q235 carbon steel
2. Experimental arrangement: the samples were subjected to an intermittent salt spray test in a cycle of 48 hours with a wetting time ratio of 80%, and the salt spray test and the drying test were each performed 6 times.
3. The specific operation of the test:
(1) the salt spray test comprises the following specific operations: spraying salt spray at 52 deg.C for 38 hr to obtain sodium chloride solution with pH of 7.0 and mass percent of 6%, wherein the sodium chloride solution is chlorinatedThe settling amount of the sodium solution is 3.0mL/(80 cm)2·h)
(2) The specific operation of the drying test was: the 38 hour samples of the salt spray test were dried at 52 ℃ for 10 hours.
Comparative example 1
The comparative example tests the corrosion resistance of carbon steel in a natural exposure manner, and the specific process is as follows:
1. test subjects: q235 carbon steel
2. Test site: sansha Yongxing island west sand test station
3. The test comprises the following specific operations: the samples were subjected to an atmospheric exposure test according to reference GB/T14165-2008.
Comparative example 2
The comparative example tests the corrosion resistance of carbon steel in an intermittent salt spray manner, and the specific process is as follows:
1. test subjects: q235 carbon steel
2. Test site: salt spray test box
3. The test comprises the following specific operations: the samples were subjected to an intermittent salt spray test with reference to GJB150.11 a.
Testing
(1) The corrosion depths of the carbon steels of examples 11 to 3 and comparative example 2 were measured by weight loss analysis to days 2, 4, 6, 8, 10 and 12, respectively, and the corrosion depths of the carbon steels of comparative example 1 were measured by weight loss analysis to months 3, 6, 9, 12, 24 and 48, respectively, and the detailed test results are shown in table 1. And the correlation number of the corrosion depths of the carbon steels of example 1 and comparative example 1 was calculated by a gray correlation method.
Table 1 shows the corrosion depths at different test times for the carbon steels of examples 11-3, comparative examples 1 and 2.
TABLE 1
As can be seen from Table 1, the corrosion depths of the carbon steels of examples 1 to 3, comparative example 1 and comparative example 2 were increased with the increase of the test time, which shows that the corrosion degrees of the carbon steels of examples 1 to 3, comparative example 1 and comparative example 2 were increased with the increase of the test time. Through grey correlation analysis, the obtained correlation coefficient of the corrosion depths of the carbon steel of the method of the example 1 and the method of the comparative example 1 is 0.64, which shows that the test result of the corrosion resistance test method of the carbon steel of the example 1 and the natural exposure test of the comparative example 1 has better correlation, and further shows that the test environment of the natural exposure test of the comparative example 1 can be better simulated by the example 1; meanwhile, as can be seen from table 1, the corrosion depth of the carbon steel corrosion resistance test method of example 1 in 96 hours is approximately similar to the corrosion depth of comparative example 1 in 4 years of natural exposure, and the acceleration rate can reach 292, which is 3 times of the acceleration rate of comparative example 2 relative to comparative example 1, which indicates that the acceleration and simulation of the carbon steel corrosion resistance test method of example 1 are superior to those of the corrosion resistance test of GJB150.11a, and further indicates that the test method of the carbon steel corrosion resistance of example 1 can simultaneously ensure higher acceleration rate and correlation, and can well simulate the experimental environment of the natural exposure test of comparative example 1.
Wherein, formula 1 for calculating the acceleration rate is as follows:
acceleration rate (AM) t1/t2Equation 1
In formula 1, AM represents acceleration rate, t1Test time (days) for carbon steel outdoor exposure test method; t is t2The time (days) at which the corrosion depth data obtained for the indoor accelerated test method was equal.
As can be seen from fig. 2 and 3, the carbon steels of example 1 and comparative example 1 have the same tendency of change in corrosion depth with time, indicating that the corrosion resistance test method for the carbon steel of example 1 has a good correlation with the natural exposure test of comparative example 1.
As can be seen from fig. 3, the corrosion depth of the carbon steel of example 1 is greater than that of the carbon steel of comparative example 2 at any time, indicating that the corrosion resistance test method of the carbon steel of example 1 has higher acceleration than that of the test method of comparative example 1.
In addition, the corrosion effect of the corrosion resistance test method of the carbon steel on the carbon steel has good correlation with the corrosion effect on the carbon steel in the marine atmosphere environment, and the acceleration is obvious, so that the method can be used for evaluating the corrosion resistance of the carbon steel in the marine atmosphere environment.
The above-described examples merely represent some specific embodiments of the invention and are not intended to be limiting thereof. It should be noted that, those skilled in the art can make modifications or equivalent substitutions on the above-mentioned embodiments without departing from the spirit of the present invention, and all the modifications or equivalent substitutions belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the invention should be subject to the appended claims.
Claims (7)
1. A corrosion resistance test method of carbon steel is used for evaluating the corrosion resistance of the carbon steel in coastal areas with high temperature, high humidity and high chloride ion sedimentation amount, and is characterized in that: the sample was subjected to a 6-cycle high-concentration salt spray-dry composite test in 48 hours;
the salt spray test comprises a salt spray test and a drying test which are alternately carried out, the salt spray test and the drying test are respectively carried out for at least 6 times, the total time of the salt spray test is 280-290 hours, and the specific operation steps of the salt spray test are as follows: spraying 5-7% (wt.%) of salt solution to the sample at 48-53 ℃, wherein the pH value of the salt solution is 6.5-7.2, and the settling amount of the salt solution is 1.5mL/(80 cm)2·h)～3.0mL/(80cm2H), the time of salt spray is 34-38 hours, and the specific operation of the drying test is as follows; and drying the sample subjected to the salt spray test at 48-53 ℃ for 10-14 hours.
2. A composite test method of corrosion resistance of carbon steel according to claim 1, characterized in that: the high-concentration salt spray-drying composite test of 1 period can simulate the field corrosion environment of the carbon steel in the coastal region for 456 to 584 days.
3. A corrosion resistance test method of carbon steel according to claim 1, wherein a wet time ratio is between 70% and 80%, and a time of the salt spray test is longer than a time of the dry test.
4. A corrosion resistance test method of carbon steel according to claim 1, wherein said salt spray test comprises 6 times of said salt spray test and 6 times of said drying test, and said salt spray test is specifically operated as: spraying a salt solution with the percentage content of 7% on a sample at the temperature of 48-53 ℃, wherein the salt solution is a sodium chloride solution, the pH value of the salt solution is 6.5-7.2, and the settling amount of the salt solution is 1.5mL/(80 cm)2·h)～3.0mL/(80cm2H), wherein the salt spray time is 34-38 hours.
5. A corrosion resistance test method of carbon steel according to claim 1, characterized in that the specific operation of the drying test is: and drying the sample subjected to the salt spray test at 48-53 ℃ for 10-14 hours.
6. The corrosion resistance composite test method according to claim 1, characterized in that: the salt solution is at least one selected from sodium chloride solution, seawater of test site and artificial seawater.
7. A corrosion resistance test method of carbon steel according to claim 1, characterized in that: the samples were predominantly carbon steel, but not limited to carbon steel.
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| CN113933232A (en) * | 2021-09-27 | 2022-01-14 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Material corrosion acceleration test method for simulating south sea island reef environment |
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| CN113933232A (en) * | 2021-09-27 | 2022-01-14 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Material corrosion acceleration test method for simulating south sea island reef environment |
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Application publication date: 20210903 |