CN112414931A - Test method for corrosion resistance of galvanized steel sheet under simulated environment - Google Patents
Test method for corrosion resistance of galvanized steel sheet under simulated environment Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 132
- 230000007797 corrosion Effects 0.000 title claims abstract description 132
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 71
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 71
- 238000010998 test method Methods 0.000 title claims description 14
- 238000012360 testing method Methods 0.000 claims abstract description 195
- 238000000034 method Methods 0.000 claims abstract description 45
- 238000001035 drying Methods 0.000 claims abstract description 23
- 238000009736 wetting Methods 0.000 claims abstract description 5
- 239000012266 salt solution Substances 0.000 claims description 47
- 150000008043 acidic salts Chemical class 0.000 claims description 24
- 239000002253 acid Substances 0.000 claims description 23
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 16
- 239000003960 organic solvent Substances 0.000 claims description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M sodium chloride Inorganic materials [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 10
- 239000011780 sodium chloride Substances 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 230000001133 acceleration Effects 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 12
- 239000007921 spray Substances 0.000 description 8
- 239000011701 zinc Substances 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 230000008859 change Effects 0.000 description 7
- 229910052725 zinc Inorganic materials 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000001764 infiltration Methods 0.000 description 5
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- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005536 corrosion prevention Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000000692 Student's t-test Methods 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- G01N17/002—Test chambers
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- G—PHYSICS
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- 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
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Abstract
The invention relates to the technical field of metal corrosion, and provides a method for testing corrosion resistance of a galvanized steel sheet by simulating an environment, which comprises the following steps: s1: stage A: simulating a high-low temperature humidity alternating environment with temperature and humidity changes day and night to perform a corrosion resistance test; s2: and (B) stage: simulating alternate wetting and drying environments in rainy seasons and non-rainy seasons to perform a corrosion resistance test; s3: after the galvanized steel sheet samples are subjected to the A-stage test and the B-stage test of S1 and S2 in an alternating cycle test, the samples are cleaned and dried, and then the corrosion resistance is evaluated. The method provided by the invention is aimed at the climatic characteristics of high temperature, high humidity, humidity and much rain in the south, considers the influence of the environment on atmospheric corrosion, effectively simulates the corrosion environment of the galvanized steel in the high temperature and high humidity environment in the south, and has higher accuracy, acceleration and repeatability.
Description
Technical Field
The invention relates to the technical field of metal corrosion, in particular to a method for testing corrosion resistance of a galvanized steel sheet by simulating an environment.
Background
The average temperature of southern areas in China, particularly provinces such as Guangdong, Guangxi, Guizhou and the like all the year round is more than 20 ℃, the areas are humid and rainy, and with the modern development, the influence on the atmospheric environment in the aspects of industrial emission, automobile exhaust and the like is increasingly large, so that the corrosion condition of metal materials of power grid equipment is more serious. The transmission line towers in China are mostly subjected to hot galvanizing anticorrosion treatment, and as an economical, efficient and highly industrialized surface protection technology, atmospheric corrosion of a hot-dip galvanized layer is ubiquitous and has more influence factors; therefore, the research on atmospheric corrosion protection of galvanized steel increasingly draws more attention and attention of researchers.
The corrosion problem under the atmospheric environment is a long-term process, so when the corrosion data or the corrosion characteristics of metal materials are researched, an indoor accelerated corrosion test method is usually adopted, the test process can be accelerated, the corrosion data and the mechanism of the materials can be obtained more quickly, and the salt spray test (GB/T19355.1 guidelines for corrosion prevention of zinc-coated steel structures and the 1 st part of the recommendation: basic principles of design and corrosion prevention) which is usually adopted cannot be used for accurately testing the corrosion of the zinc-coated steel under the atmospheric environment, and the corrosion mechanism is not suitable; without proper dry/wet cycle, the zinc layer can not form an oxide layer, the oxide layer is lacked, the metal zinc is continuously corroded, and the predicted service life of the obtained zinc coating is very low, thereby influencing the test result of hot galvanizing accelerated corrosion.
Chinese patent application No. CN2014103366132 discloses a corrosion simulation method and a corrosion resistance evaluation method for a galvanized steel coating in an industrial atmospheric environment, and spray liquid for simulating an industrial atmospheric corrosion medium comprises: NaHSO310.41g/L, NaCl 0.585g/L and the balance of distilled water; and (3) simulating the industrial atmospheric corrosion process by adopting spray/drying cycle corrosion. The method can be used for simulating the industrial atmospheric corrosion process, has the simulative property, the acceleration property and the reproducibility, can be used for quickly evaluating the corrosion resistance of the zinc coating in the industrial atmospheric environment, and provides a basis for reasonably selecting the galvanization protection and predicting the protection life of the galvanization protection. However, the corrosion simulation method of the present invention is not suitable for evaluating the corrosion performance of galvanized steel sheets in a normal atmospheric environment.
Disclosure of Invention
The invention aims to provide a method for testing the corrosion resistance of a galvanized steel sheet in a simulated environment, which aims at the climatic characteristics of high temperature, high humidity and much rain in the south, considers the influence of the environment on atmospheric corrosion, effectively simulates the corrosion environment of the galvanized steel in the high temperature and high humidity environment in the south, and has higher accuracy, acceleration and repeatability.
The embodiment of the invention is realized by the following technical scheme:
a test method for simulating the corrosion resistance of an environment to a galvanized steel sheet comprises the following steps:
s1: stage A: simulating a high-low temperature humidity alternating environment with temperature and humidity changes day and night to perform a corrosion resistance test;
s2: and (B) stage: simulating alternate wetting and drying environments in rainy seasons and non-rainy seasons to perform a corrosion resistance test;
s3: after the galvanized steel sheet samples are subjected to the A-stage test and the B-stage test of S1 and S2 in an alternating cycle test, the samples are cleaned and dried, and then the corrosion resistance is evaluated.
Further, the low-temperature environment stage in step S1 is: the temperature is 0-10 ℃, and the humidity is 70-80 RH%; the high-temperature environment stage is as follows: the temperature is 40-50 ℃, and the humidity is 40-50 RH%.
Further, in the step S1, a test period is 10-16 hours, wherein the low-temperature environment stage test is 4-6 hours, the high-temperature environment stage test is 6-10 hours, and the low-temperature environment stage test and the high-temperature environment stage test are completed in sequence, and the stage a test is completed after one test period.
Further, in step S2, the rainy season environment is simulated by using an acidic salt solution, which includes: NaHSO with concentration of 1.5-2.0 g/L3NaCl with the mass fraction of 5-7%, and the pH value of the acidic salt solution is 1.5-5; the temperature of the acid salt solution is 10-25 ℃.
In the test process, the influence of industry on atmospheric environmental pollution is fully considered, and the galvanized steel sheet is exposed to SO2In an industrial environment, SO2Will be gradually adsorbed by a thin liquid film on the surface of the galvanized steel sheet to form sulfite (HSO)3-) Promoting the corrosion of the material; therefore, the invention adds NaHSO in the test3To simulate SO2The influence of (c).
Further, the drying temperature for simulating the non-rainy season environment in the step S2 is 35-50 ℃, and the humidity is 40-50 RH%.
Further, in the step S2, a test period is 10-16 hours, wherein the test period is 5-8 hours after the test period is immersed in the acidic salt solution to simulate the rainy season environment, and 5-8 hours after the test period is simulated for the non-rainy season environment, and the test period of simulating the rainy season environment and the test period of simulating the non-rainy season environment are sequentially completed, so that the stage B test is completed.
Further, the A-stage test and the B-stage test in the step S3 are performed for 20-40 times in an alternating cycle.
Further, the uppermost end of the galvanized steel sheet sample in the step S2 should be located at least 10mm below the surface of the acidic salt solution.
Further, in the step S3, the surface of the galvanized steel sheet sample is cleaned by using an organic solvent, wherein the organic solvent is analytically pure acetone or alcohol; after the surface of a galvanized steel sheet sample is cleaned and dried, corrosion observation, corrosion rate calculation, corrosion microscopic morphology observation and corrosion product detection are carried out to evaluate the corrosion resistance.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
1. the invention adopts high-low temperature and humidity alternating circulation and combines infiltration-drying circulation to simulate the high-temperature and high-humidity and environment-polluted atmospheric environment in the south; through the A stage: a high-low temperature humidity alternating test for simulating the temperature and humidity change of day and night; simulating alternate wetting and drying tests in rainy season and non-rainy season through a stage B; the alternating cycle test of the A stage and the B stage is used for simulating the alternating daily atmospheric environment, and the test method has the simulation property, the acceleration property and the repeatability so as to be suitable for evaluating the corrosion resistance of the galvanized steel sheet in the southern atmospheric environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic representation of a sample C, D provided in test example 2 of the present invention after completion of the test by the method of example 1;
FIG. 2 is a Scanning Electron Microscope (SEM) image of a sample C, D provided in test example 4 of the present invention after completion of the test by the method of example 3;
fig. 3 is an XRD analysis pattern of sample C, D provided in experimental example 5 of the present invention after completion of the test by the method of example 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by manufacturers, and are conventional hardware tools available through commercial purchase.
The following describes a method for testing corrosion resistance of a galvanized steel sheet in a simulated environment and a preparation method thereof.
Example 1
A test method for simulating the corrosion resistance of an environment to a galvanized steel sheet comprises the following steps:
s1: stage A: the high-low temperature humidity alternating environment for simulating the temperature and humidity change of day and night comprises the following low-temperature environment stages: the temperature is 5 ℃, and the humidity is 72 RH%; the high-temperature environment stage is as follows: the temperature is 46 ℃, and the humidity is 47 RH%; one test period is 10h, wherein the low-temperature environment stage test is 5h, the high-temperature environment stage test is 5h, and the low-temperature environment stage test and the high-temperature environment stage test are completed in sequence, namely the A-stage test is completed in one test period;
s2: and (B) stage: simulating alternate infiltration and drying environments in rainy seasons and non-rainy seasons, simulating the environment in rainy seasons by using an acid salt solution, wherein the uppermost end of the galvanized steel sheet sample is at least 10mm below the liquid level of the acid salt solution; the acidic salt solution comprises: NaHSO with concentration of 1.5g/L3NaCl with the mass fraction of 7 percent and the pH value of the acid salt solution of 5; the temperature of the acid salt solution is 10 ℃; the drying temperature of the simulated non-rainy season environment is 35 ℃, and the humidity is 50 RH%; one test period is 16h, the test is immersed in the acidic salt solution to simulate the rainy season environment test for 8h, the non-rainy season environment test for 8h, and the simulated rainy season environment test and the simulated non-rainy season environment test are sequentially completed, namely the B-stage test is completed in one test period;
s3: after the galvanized steel sheet sample is subjected to the A-stage test and the B-stage test of S1 and S2 for 20 times of alternate circulation tests, cleaning the surface of the galvanized steel sheet sample by using an organic solvent, wherein the organic solvent is analytically pure acetone or alcohol; after the surface of a galvanized steel sheet sample is cleaned and dried, corrosion observation, corrosion rate calculation, corrosion microscopic morphology observation and corrosion product detection are carried out to evaluate the corrosion resistance.
Example 2
A test method for simulating the corrosion resistance of an environment to a galvanized steel sheet comprises the following steps:
s1: stage A: the high-low temperature humidity alternating environment for simulating the temperature and humidity change of day and night comprises the following low-temperature environment stages: the temperature is 0 ℃, and the humidity is 75 RH%; the high-temperature environment stage is as follows: the temperature is 40 ℃, and the humidity is 50 RH%; one test period is 12h, wherein the low-temperature environment stage test is 6h, the high-temperature environment stage test is 6h, and the low-temperature environment stage test and the high-temperature environment stage test are completed in sequence, namely the A-stage test is completed in one test period;
s2: and (B) stage: simulating alternate infiltration and drying environments in rainy seasons and non-rainy seasons, simulating the environment in rainy seasons by using an acid salt solution, wherein the uppermost end of the galvanized steel sheet sample is at least 10mm below the liquid level of the acid salt solution; the acidic salt solution comprises: NaHSO with concentration of 1.8g/L36.5 percent of NaCl by mass and 3 of pH value of the acidic salt solution; the temperature of the acid salt solution is 12 ℃; the drying temperature of the simulated non-rainy season environment is 36 ℃, and the humidity is 48 RH%; one test period is 10 hours, wherein the test is immersed in the acidic salt solution to simulate the rainy season environment test for 5 hours, the non-rainy season environment test for 5 hours, and the simulated rainy season environment test and the simulated non-rainy season environment test are sequentially completed, namely the B-stage test is completed in one test period;
s3: after the galvanized steel sheet sample is subjected to the A-stage test and the B-stage test of S1 and S2 for 40 times of alternate circulation tests, cleaning the surface of the galvanized steel sheet sample by using an organic solvent, wherein the organic solvent is analytically pure acetone or alcohol; after the surface of a galvanized steel sheet sample is cleaned and dried, corrosion observation, corrosion rate calculation, corrosion microscopic morphology observation and corrosion product detection are carried out to evaluate the corrosion resistance.
Example 3
A test method for simulating the corrosion resistance of an environment to a galvanized steel sheet comprises the following steps:
s1: stage A: the high-low temperature humidity alternating environment for simulating the temperature and humidity change of day and night comprises the following low-temperature environment stages: the temperature is 2 ℃, and the humidity is 80 RH%; the high-temperature environment stage is as follows: the temperature is 44 ℃, and the humidity is 45 RH%; one test period is 12h, wherein the low-temperature environment stage test is 5h, the high-temperature environment stage test is 7h, and the low-temperature environment stage test and the high-temperature environment stage test are completed in sequence, namely the A-stage test is completed;
s2: and (B) stage: simulating alternate wetting and drying environment in rainy season and non-rainy season, and simulating environment in rainy season by using acidic salt solutionThe uppermost end of the galvanized steel sheet sample is at least 10mm below the liquid level of the acidic salt solution; the acidic salt solution comprises: NaHSO with concentration of 1.7g/L3NaCl with the mass fraction of 6 percent and the pH value of the acid salt solution of 2; the temperature of the acid salt solution is 22 ℃; the drying temperature of the simulated non-rainy season environment is 40 ℃, and the humidity is 45 RH%; one test period is 12 hours, wherein the test is immersed in the acidic salt solution to simulate the rainy season environment for 6 hours, the non-rainy season environment for 6 hours is simulated, and the simulated rainy season environment test and the simulated non-rainy season environment test are completed in sequence, namely the B-stage test is completed in one test period;
s3: after the galvanized steel sheet sample is subjected to the A-stage test and the B-stage test of S1 and S2 for 40 times of alternate circulation tests, cleaning the surface of the galvanized steel sheet sample by using an organic solvent, wherein the organic solvent is analytically pure acetone or alcohol; after the surface of a galvanized steel sheet sample is cleaned and dried, corrosion observation, corrosion rate calculation, corrosion microscopic morphology observation and corrosion product detection are carried out to evaluate the corrosion resistance.
Example 4
A test method for simulating the corrosion resistance of an environment to a galvanized steel sheet comprises the following steps:
s1: stage A: the high-low temperature humidity alternating environment for simulating the temperature and humidity change of day and night comprises the following low-temperature environment stages: the temperature is 4 ℃, and the humidity is 76 RH%; the high-temperature environment stage is as follows: the temperature is 42 ℃, and the humidity is 43 RH%; one test period is 13h, wherein the low-temperature environment stage test is 5h, the high-temperature environment stage test is 8h, and the low-temperature environment stage test and the high-temperature environment stage test are completed in sequence, namely the A-stage test is completed;
s2: and (B) stage: simulating alternate infiltration and drying environments in rainy seasons and non-rainy seasons, simulating the environment in rainy seasons by using an acid salt solution, wherein the uppermost end of the galvanized steel sheet sample is at least 10mm below the liquid level of the acid salt solution; the acidic salt solution comprises: NaHSO with concentration of 1.9g/L3NaCl with the mass fraction of 5.5 percent and the pH value of the acid salt solution is 4; the temperature of the acid salt solution is 20 ℃; the drying temperature of the simulated non-rainy season environment is 45 ℃, and the humidity is 42 RH%; one test period was 14 hours, in which immersion in acidic salt solution simulates rainy season environmentThe test is carried out for 7h, the non-rainy season environment test is simulated for 7h, and the B-stage test is completed after one test period of the simulated rainy season environment test and the simulated non-rainy season environment test is completed in sequence;
s3: after the galvanized steel sheet sample is subjected to the A-stage test and the B-stage test of S1 and S2 for 30 times of alternate circulation tests, cleaning the surface of the galvanized steel sheet sample by using an organic solvent, wherein the organic solvent is analytically pure acetone or alcohol; after the surface of a galvanized steel sheet sample is cleaned and dried, corrosion observation, corrosion rate calculation, corrosion microscopic morphology observation and corrosion product detection are carried out to evaluate the corrosion resistance.
Example 5
A test method for simulating the corrosion resistance of an environment to a galvanized steel sheet comprises the following steps:
s1: stage A: the high-low temperature humidity alternating environment for simulating the temperature and humidity change of day and night comprises the following low-temperature environment stages: the temperature is 10 ℃, and the humidity is 78 RH%; the high-temperature environment stage is as follows: the temperature is 50 ℃, and the humidity is 40 RH%; one test period is 12h, wherein the low-temperature environment stage test is 6h, the high-temperature environment stage test is 6h, and the low-temperature environment stage test and the high-temperature environment stage test are completed in sequence, namely the A-stage test is completed in one test period;
s2: and (B) stage: simulating alternate infiltration and drying environments in rainy seasons and non-rainy seasons, simulating the environment in rainy seasons by using an acid salt solution, wherein the uppermost end of the galvanized steel sheet sample is at least 10mm below the liquid level of the acid salt solution; the acidic salt solution comprises: NaHSO with concentration of 2.0g/L3NaCl with the mass fraction of 5 percent and the pH value of the acid salt solution is 1.5; the temperature of the acid salt solution is 15 ℃; the drying temperature of the simulated non-rainy season environment is 48 ℃, and the humidity is 41 RH%; one test period is 12 hours, wherein the test is immersed in the acidic salt solution to simulate the rainy season environment for 6 hours, the non-rainy season environment for 6 hours is simulated, and the simulated rainy season environment test and the simulated non-rainy season environment test are completed in sequence, namely the B-stage test is completed in one test period;
s3: after the galvanized steel sheet sample is subjected to the A-stage test and the B-stage test of S1 and S2 for 20 times of alternate circulation tests, cleaning the surface of the galvanized steel sheet sample by using an organic solvent, wherein the organic solvent is analytically pure acetone or alcohol; after the surface of a galvanized steel sheet sample is cleaned and dried, corrosion observation, corrosion rate calculation, corrosion microscopic morphology observation and corrosion product detection are carried out to evaluate the corrosion resistance.
Example 6
A test method for simulating the corrosion resistance of an environment to a galvanized steel sheet comprises the following steps:
s1: stage A: the high-low temperature humidity alternating environment for simulating the temperature and humidity change of day and night comprises the following low-temperature environment stages: the temperature is 8 ℃, and the humidity is 70 RH%; the high-temperature environment stage is as follows: the temperature is 47 ℃, and the humidity is 49 RH%; one test period is 14h, wherein the low-temperature environment stage test is 5h, the high-temperature environment stage test is 9h, and the low-temperature environment stage test and the high-temperature environment stage test are completed in sequence, namely the A-stage test is completed;
s2: and (B) stage: simulating alternate infiltration and drying environments in rainy seasons and non-rainy seasons, simulating the environment in rainy seasons by using an acid salt solution, wherein the uppermost end of the galvanized steel sheet sample is at least 10mm below the liquid level of the acid salt solution; the acidic salt solution comprises: NaHSO with concentration of 1.6g/L3NaCl with the mass fraction of 5.8 percent and the pH value of the acid salt solution is 1.8; the temperature of the acid salt solution is 25 ℃; the drying temperature of the simulated non-rainy season environment is 50 ℃, and the humidity is 40 RH%; one test period is 14h, wherein the test is immersed in the acidic salt solution to simulate the rainy season environment for 6h, the non-rainy season environment for 8h, and the simulated rainy season environment test and the simulated non-rainy season environment test are sequentially completed, namely the B-stage test is completed in one test period;
s3: after the galvanized steel sheet sample is subjected to the A-stage test and the B-stage test of S1 and S2 for 30 times of alternate circulation tests, cleaning the surface of the galvanized steel sheet sample by using an organic solvent, wherein the organic solvent is analytically pure acetone or alcohol; after the surface of a galvanized steel sheet sample is cleaned and dried, corrosion observation, corrosion rate calculation, corrosion microscopic morphology observation and corrosion product detection are carried out to evaluate the corrosion resistance.
Comparative example 1
The comparative example provides a test method for simulating the corrosion resistance of an environment to a galvanized steel sheet, which comprises the following steps:
soaking the sample in a salt spray box for a salt spray test; NaHSO in salt solution3The concentration was 1.8g/L, the pH was 2 and the temperature was 25 ℃.
Comparative example 2
The comparative example provides a test method for simulating the corrosion resistance of an environment to a galvanized steel sheet, which comprises the following steps:
the sample is subjected to a spray and dry alternation test; wherein the spray liquid is: NaHSO310.41g/L, NaCl 0.585g/L and the balance of distilled water; wherein the temperature of spraying and drying is 35 deg.C, the relative humidity during spraying is 100%, and the relative humidity during drying is below 20%. The cycle time is 12h, wherein the spraying process is 4h, and the drying process is 8 h.
Preparation of galvanized steel sheet test samples:
respectively taking a sample A, a sample B, a sample C and a sample D which have the same size and are provided by a factory A, a factory B, a factory C and a factory D; different batches of sample E and sample F were provided from the first plant.
Test example 1
The surfaces of the test pieces of the zinciferous coated steel sheets after the completion of the test were observed by passing the test pieces A, B through example 5, 240h by the method test of comparative example 1, and 20 cycle periods by the method test of comparative example 1, and the results are shown in table 1.
TABLE 1 corrosiveness of galvanized Steel sheet
As can be seen from Table 1, the test time of the test example is 240h, the corrosion resistance of the galvanized steel sheet can be more accurately and rapidly tested by adopting the method of combining high-temperature and low-temperature circulation with dry-wet circulation, and the corrosion resistance of the sample A can be judged to be stronger than that of the sample B; the method has better simulation, acceleration and corrosion.
Test example 2
The test pieces C, D were all tested by the method of example 1, and the surface of the tested galvanized steel sheet was observed and photographed, and the results are shown in fig. 1.
As can be seen from fig. 1, sample C had completely lost the silvery-white metallic luster, but each corrosion spot was small; the sample D has serious corrosion phenomenon, and large corrosion points appear; the corrosion resistance of the sample C can be judged to be stronger than that of the sample D; the method of combining high-temperature and low-temperature circulation with dry-wet circulation has obvious corrosion acceleration effect and is easy to observe and compare and analyze.
Test example 3
The samples A to F are tested by the methods of the embodiments 1 to 6 and are sequentially marked as A1 to F6; test 480h by the method of comparative example 1, 40 cycle cycles by the method of comparative example 1, in that order noted A7-F8; calculating the corrosion rate of the corrosion points on the surface of the galvanized steel sheet sample after the test is finished; the calculation formula is as follows:
in the formula:
v-sample corrosion rate, μm/a;
Δ W-weight loss of sample, g;
rho-metal material density, g.cm-3；
A-area of sample, cm2；
t-test period, h.
The calculated corrosion rates for the respective samples are shown in table 2.
TABLE 2 Corrosion Rate (mm/a)
As can be seen from Table 2, the corrosion rate of the sample B, D is high, and the corrosion resistance can be judged by testing the corrosion rate of each sample by adopting a method of combining high-temperature and low-temperature circulation with dry-wet circulation according to the invention as follows: f is more than A, more than E, more than C, more than D, and more than B, while the salt spray method is only adopted in the comparative example 1, and the dry-wet alternation method is only adopted in the comparative example 2; the methods of comparative example 1 and comparative example 2 are used for testing samples and testing corrosion rate, the accuracy is not high, and the corrosion resistance of each sample is not easy to judge; the method of combining the high-temperature and low-temperature circulation with the dry-wet circulation has high accuracy and repeatability, and can easily judge the corrosion resistance of different samples.
Test example 4
The test specimens C, D were all tested by the method of example 3, and the surface morphology of the zinc coating was observed by a Scanning Electron Microscope (SEM) on the surface of the test specimen C, D; the results are shown in FIG. 2.
As can be seen from fig. 2, the surface of the sample C generates less corrosion products, and the surface of the corrosion product layer is more uniform and flat; a large amount of corrosion products are generated on the surface of the sample D, the corrosion products are compact, the corrosion products are needle-shaped, are gathered together and densely connected into a piece, and are distributed in an irregular shape, and the surface of the corrosion product layer is uneven and flat. The corrosion resistance of the sample C can be judged to be stronger than that of the sample D; the method of combining high-temperature and low-temperature circulation with dry-wet circulation has obvious corrosion acceleration effect and is easy to observe and compare and analyze.
Test example 5
All the samples C, D were tested by the method of example 3, and the corrosive substance generated on the surface of the sample C, D was analyzed by XRD; the results are shown in FIG. 3.
As can be seen from FIG. 3, the main corrosion product of the surface of sample C, D is NaZn4(SO4)Cl(OH)6·6H2O and Zn5(OH)8Cl2·H2And O. The diffraction peaks of these two corrosion products are very sharp and prominent, corresponding well to the three strong peaks in the standard spectrum. The invention adopts high-temperature low-temperature circulationThe method combined with the dry-wet cycle can obtain corrosion products similar to those actually exposed to the atmospheric environment. The method of the invention adopting high temperature and low temperature circulation combined with dry and wet circulation is proved to have higher accuracy and repeatability.
In conclusion, the method of combining high-temperature and low-temperature circulation with dry-wet circulation has high accuracy and repeatability, and can accurately and quickly test the corrosivity of the galvanized steel sheet; and the accelerated corrosion effect is obvious, and the observation and comparative analysis are easy.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A test method for simulating the corrosion resistance of an environment to a galvanized steel sheet is characterized by comprising the following steps:
s1: stage A: simulating a high-low temperature humidity alternating environment with temperature and humidity changes day and night to perform a corrosion resistance test;
s2: and (B) stage: simulating alternate wetting and drying environments in rainy seasons and non-rainy seasons to perform a corrosion resistance test;
s3: after the galvanized steel sheet samples are subjected to the A-stage test and the B-stage test of S1 and S2 in an alternating cycle test, the samples are cleaned and dried, and then the corrosion resistance is evaluated.
2. The method for testing the corrosion resistance of the galvanized steel sheet in the simulated environment according to claim 1, wherein the low-temperature environment stage in the step S1 is as follows: the temperature is 0-10 ℃, and the humidity is 70-80 RH%; the high-temperature environment stage is as follows: the temperature is 40-50 ℃, and the humidity is 40-50 RH%.
3. The method for testing the corrosion resistance of the galvanized steel sheet in the simulated environment according to claim 1, wherein in the step S1, a test period is 10-16 h, wherein a low-temperature environment phase test is 4-6 h, a high-temperature environment phase test is 6-10 h, and the A-phase test is completed after the low-temperature environment phase test and the high-temperature environment phase test are completed in sequence by one test period.
4. The method for testing corrosion resistance of a galvanized steel sheet according to the simulated environment of claim 1, wherein in the step S2, an acidic salt solution is used for simulating the rainy season environment, and the acidic salt solution comprises: NaHSO with concentration of 1.5-2.0 g/L3NaCl with the mass fraction of 5-7%, and the pH value of the acidic salt solution is 1.5-5; the temperature of the acid salt solution is 10-25 ℃.
5. The method for testing corrosion resistance of a galvanized steel sheet according to claim 1, wherein the drying temperature of the simulated non-rainy season environment in the step S2 is 35-50 ℃, and the humidity is 40-50 RH%.
6. The method for testing corrosion resistance of a galvanized steel sheet according to claim 1, wherein in step S2, a test period is 10-16 h, the test period is 5-8 h after the test is immersed in an acidic salt solution to simulate a rainy season environment, 5-8 h after the test is simulated for a non-rainy season environment, and the B-stage test is completed after the test period of the test period is completed.
7. The method for testing the corrosion resistance of the galvanized steel sheet in the simulated environment according to claim 1, wherein the A-stage test and the B-stage test in the step S3 are performed for 20-40 times in an alternating cycle.
8. The method for testing corrosion resistance of a galvanized steel sheet according to the simulated environment of claim 1, wherein the uppermost end of the galvanized steel sheet sample in the step S2 is at least 10mm below the liquid level of the acidic salt solution.
9. The method for testing corrosion resistance of a galvanized steel sheet according to claim 1, wherein in step S3, the surface of the galvanized steel sheet sample is cleaned by using an organic solvent, wherein the organic solvent is analytically pure acetone or alcohol; after the surface of a galvanized steel sheet sample is cleaned and dried, corrosion observation, corrosion rate calculation, corrosion microscopic morphology observation and corrosion product detection are carried out to evaluate the corrosion resistance.
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