CN113866081A - Automobile radiator corrosion test evaluation method - Google Patents
Automobile radiator corrosion test evaluation method Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 296
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- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000004580 weight loss Effects 0.000 claims abstract description 15
- 150000003839 salts Chemical class 0.000 claims description 18
- 239000007921 spray Substances 0.000 claims description 16
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- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 6
- 229910021641 deionized water Inorganic materials 0.000 description 6
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
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- 235000006408 oxalic acid Nutrition 0.000 description 2
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- 238000011160 research Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
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- 239000011248 coating agent Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 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
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Abstract
The invention relates to a corrosion test evaluation method of an automobile radiator, which comprises the steps of putting an aluminum alloy radiator sample into a waiting alternation test box, a corrosion alternation test box or a damp-heat test box according to a corresponding test mode to carry out 1 cycle combination test, and repeating the cycle combination test for 10 times; evaluating the corrosion resistance and failure of the radiator according to the appearance and weight loss characteristics of an aluminum alloy radiator test sample and the air tightness after the test; and establishing an evaluation standard. The automobile radiator corrosion test evaluation method can more comprehensively consider a plurality of environmental factors of aluminum alloy corrosion, can simulate the alternating action of a plurality of loads under the actual corrosion condition of the radiator, enables the radiator to be subjected to the destructive action in the atmospheric environment as much as possible, and reflects the corrosion failure condition of the radiator in the future use through the result of the artificial accelerated cycle combination test; the test is carried out by adopting standard test equipment, the test process is controllable, the reproducibility is good, the result is real, and the test period is shorter.
Description
Technical Field
The invention belongs to the technical field of automobile tests, and particularly relates to an automobile radiator corrosion test evaluation method.
Background
The radiator is assembled at a position below the front part of the vehicle body as a part of an air conditioning system for a vehicle, and in order to better realize light weight of automobile products, the manufacturing material of the radiator is preferably aluminum alloy, and metal copper is gradually replaced as the radiator material. However, when the automobile runs, the automobile is easy to contact with corrosive media such as snow-melting agent, muddy water and the like, and if the corrosion resistance of the material used for manufacturing the radiator does not meet the requirement, the aluminum alloy radiator is rusted and leaked. In the process of analyzing the rust penetration of the radiator, the fact that the rust penetration of the radiator is caused by external reasons is found, and when the radiator works internally, condensing agents and grease are required to be non-corrosive working solution, so that the radiator cannot be corroded. In order to meet the requirements of verification of the corrosion resistance of a radiator assembly and improvement of the corrosion resistance of used materials, a manual acceleration single test such as a salt spray test (with the standard of GB/T1771) is adopted in the past, and the technology is mature and is widely applied. However, various documents and research results show that the simple salt spray test result is not consistent with the corrosion result actually exposed in the atmosphere.
At present, many research and development departments of testing apparatuses, aluminum alloy material companies, automobile companies and the like have studied and proposed artificially accelerated combination tests, such as a climate alternation test (standard PV1200) and a corrosion alternation test (standard PV 1210). The climate alternation test is a test method for simulating the action of atmospheric environment (such as humid and hot ocean environment, dry and hot desert environment, cold and low temperature environment) on the coating, strengthening factors in two aspects of temperature and humidity, evaluating the appearance and air tightness performance changes of automobile parts and examining the failure of the automobile radiator. The method is a test method for corrosion resistance failure of the aluminum alloy, and is limited in that the effects of loads such as chloride ions, condensation, extreme temperature change and the like on the failure of the radiator under the condition that the actual corrosion of the aluminum alloy radiator cannot be simulated. The corrosion alternation test is a test method for simulating the action of atmospheric environment (such as damp and hot marine environment, dry and hot desert environment, cold and low temperature environment and sub-damp and hot acid rain environment) on the radiator, evaluating the change of the appearance and the air tightness of the radiator in a salt spray test and damp and hot test alternation test mode and checking the failure of the radiator. The method is a test method for corrosion resistance failure of the automobile radiator, and is limited in that the effect of external force striking, shock cooling, shock heating and other loads on the failure of the radiator under the condition that the actual corrosion of the radiator cannot be simulated. Through years of development of test equipment, the salt spray test box, the damp-heat test box, the climate alternation test box and the corrosion alternation test box are widely applied to enterprise standard and corrosion resistance evaluation work. The various test boxes respectively give results on the corrosion resistance of the radiator, and if the corrosion result of actual exposure in the atmosphere is desired, the above various items need to be comprehensively considered.
In conclusion, if an automobile radiator corrosion test evaluation method can be developed, the actual corrosion condition of the radiator can be simulated more comprehensively, and the corrosion failure condition of the radiator in the subsequent use process is reflected by the test result, so that the method is very necessary and has wide application value.
Disclosure of Invention
The invention aims to provide an automobile radiator corrosion test evaluation method to solve the problem that the alternation of a plurality of loads under the actual corrosion condition of a simulated radiator can reflect the corrosion failure condition of the radiator in the subsequent use.
The purpose of the invention is realized by the following technical scheme:
an automobile radiator corrosion test evaluation method comprises the following steps:
A. placing an aluminum alloy radiator sample into a climate alternation test chamber, a corrosion alternation test chamber or a damp-heat test chamber according to a corresponding test mode to perform 1 cycle combination test, and repeating the cycle combination test for 6-10 times;
B. evaluation of corrosion resistance failure of the radiator: evaluating whether the quality problem of the aluminum alloy radiator is caused by the appearance and the weightlessness characteristics of the aluminum alloy radiator test sample after the test at different parts, and judging the quality risk level according to different test results; evaluating whether the air tightness meets the requirements after the radiator corrosion test;
C. establishing an evaluation standard:
on the premise that the brazing connection position is not separated and the part of a condenser pipe of the radiator is not corroded, the appearance corrosion grade is divided according to the corrosion area of an aluminum alloy radiator test sample; dividing the weight loss grades according to the quality-to-weight ratio of the samples before and after the test, wherein the weight loss caused by the plane corrosion or the groove-shaped corrosion of the radiating fins and the condensing tubes is required to be less than 10 percent; according to the corrosion form result observed by a metallographic microscope, the welding part of the radiator fin and the condenser pipe requires that the intergranular corrosion phenomenon is not allowed to occur, and after 10 cycle tests, the air tightness of the radiator is good.
Further, step a, the test patterns include six kinds, which are a climate alternation test → a moist heat test → a corrosion alternation test, a climate alternation test → a corrosion alternation test → a moist heat test, a corrosion alternation test → a climate alternation test → a moist heat test, a corrosion alternation test → a moist heat test → a corrosion alternation test, a moist heat test → a climate alternation test → a corrosion alternation test and a moist heat test → a corrosion alternation test → a climate alternation test.
Furthermore, in the 1-cycle combination test, the climate alternation test comprises the following specific steps: high temperature (80 ℃ ± 2 ℃, 80% RH) × 15.5h → (room temperature) × 0.5h → low temperature (-40 ℃ ± 2 ℃) × 7.5h → (room temperature) × 0.5h, for 1 day.
Furthermore, in the 1-cycle combination test, the specific steps of the corrosion alternation test are as follows: salt spray test × 4h → (room temperature) × 4h → moist heat test (high humidity 50 ℃ ± 2 ℃, 100% RH) × 15.5h → (room temperature) × 0.5h for 5 days.
Furthermore, in the 1-cycle combination test, the specific steps of the damp-heat test are as follows: (low humidity 35 ℃ C. + -. 3 ℃ C., 100% RH). times.120 h for 1 day.
Further, in step a, the cycle combination test is repeated for 10 times.
Further, step C, the appearance corrosion grades include Ri 0 grade, Ri 1 grade, Ri 2 grade, Ri 3 grade, Ri 4 grade and Ri 5 grade, wherein the corrosion area corresponding to Ri 0 grade is 0%, the corrosion area corresponding to Ri 1 grade is 0.05%, the corrosion area corresponding to Ri 2 grade is 0.5%, the corrosion area corresponding to Ri 3 grade is 1%, the corrosion area corresponding to Ri 4 grade is 8%, and the corrosion area corresponding to Ri 5 grade is 40-50%.
Further, in step C, the weight loss grades include an LW 0 grade, an LW 1 grade, an LW 2 grade, an LW3 grade, an LW 4 grade, and an LW 5 grade, where the mass ratio corresponding to the LW 0 grade is 0%, the mass ratio corresponding to the LW 1 grade is 0.5%, the mass ratio corresponding to the LW 2 grade is 1%, the mass ratio corresponding to the LW3 grade is 10%, the mass ratio corresponding to the LW 4 grade is 30%, and the mass ratio corresponding to the LW 5 grade is 70%.
Further, the weight loss rating requires that the reduction in wall thickness due to corrosion of the fin and condenser tube planes or channel corrosion should be no more than 20% of the measured wall thickness.
Further, in the step C, the air tightness of the radiator meets the requirement that the radiator does not leak air under the pressure of 5 bar.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention simulates the alternate action of a plurality of loads under the actual corrosion condition of the radiator, and the radiator is subjected to the destructive action in the atmospheric environment as much as possible by designing a series of tests, and the corrosion failure condition of the radiator in the future use is reflected by a test result;
2. the invention more comprehensively considers a plurality of environmental factors of aluminum alloy corrosion, especially chlorine ion corrosion factors and the natural phenomenon of day and night alternation, combines the test processes of salt spray test, damp and hot test, corrosion alternation test and the like according to a certain test sequence, and carries out the test in a circulating way, records the test result by taking the test period as a unit, and provides an artificial accelerated circulation combined test;
3. the design of the test method takes the sequence of the occurrence of each environmental factor of metal corrosion into consideration, and the test of each cycle starts from the least severe test so as to obtain more information before the metal is corroded;
4. the test is carried out by adopting standard test equipment, the test process is controllable, the reproducibility is good, the result is real, and the test period is shorter;
5. the evaluation method can comprehensively simulate the actual corrosion condition of the radiator, and the corrosion failure condition of the radiator in the subsequent use process is reflected through the test result, so that the corrosion failure of the automobile radiator is evaluated.
Detailed Description
The invention is further illustrated by the following examples:
the invention adopts a climate alternation test chamber, a corrosion alternation test chamber and a damp-heat test chamber to respectively carry out a climate alternation test, a corrosion alternation test and a damp-heat test.
The climate alternation test adopts a one-steam standard Q/CAM-64.8 climate alternation test method, which comprises the following steps: the test sample is stored for 15.5h in a climate alternation test box with the test temperature of 80 +/-2 ℃, and then stored for 0.5h under the GB/T9278 condition for state adjustment. The same sample is stored in a climate alternation test box with the temperature of minus 40 +/-2 ℃ for 7.5h, and then stored for 0.5h under the GB/T9278 condition for state adjustment, which is 1 climate alternation test period. The test aims to simulate the adaptability research of a sample under the condition of alternation of extreme climatic conditions and test whether the separation phenomenon occurs at the brazing connection part of the part under the environmental condition, so that the quality of the part is in a problem.
The corrosion alternation test adopts a one-steam standard Q/CAM-62.2 cycle corrosion alternation test method, which comprises the following steps: the salt spray test is carried out for 4h according to the test method in the salt spray test which is a corrosion test in an ISO 9227 artificial environment, after the test is finished, the test sample piece is placed in a standard environment (the temperature is 23 +/-2 ℃) or room temperature for 4h for state adjustment, and after the state adjustment is finished, the damp-heat test of high humidity test (50 +/-2 ℃, 100% RH) multiplied by 15.5h → 0.5h (room temperature) is carried out according to the DIN 50017 climate and the test method in the technical application condensation artificial climate, wherein the test period is 1 corrosion alternation test period.
Standard method of Damp-Heat test Low Damp-Heat test (low humidity 35 ℃ C. + -. 3 ℃ C., 100% RH) was carried out according to DIN 50017 climate and its technical application in the test method in condensation artificial climate for 120h, which is 1 Damp-heat test cycle.
The method is characterized in that an aluminum alloy radiator sample is used for testing, six test modes of radiator corrosion tests are provided, the test processes are combined into 1 cycle combined test according to a certain test sequence, the 1 cycle combined test comprises a test mode, the cycle combined test is repeated for 6-10 times, and the test modes of the six radiator corrosion tests are respectively as follows:
1. climate alternation test → damp heat test → corrosion alternation test → evaluation;
2. climate alternation test → corrosion alternation test → damp-heat test → evaluation;
3. corrosion alternation test → climate alternation test → damp heat test → evaluation;
4. corrosion alternation test → damp heat test → corrosion alternation test → evaluation;
5. damp and hot test → climate alternation test → corrosion alternation test → evaluation;
6. damp heat test → corrosion alternation test → climate alternation test → evaluation.
For example, the test modes include: climate alternation test → corrosion alternation test → damp heat test
Specific measures of 10-cycle test of heat radiator corrosion test:
1 cycle is defined as: high temperature (80 ℃ ± 2 ℃, 80% RH) × 15.5h → (room temperature) × 0.5h → low temperature (-40 ℃ ± 2 ℃) × 7.5h → (room temperature) × 0.5h → salt spray test × 4h → (room temperature) × 4h → damp heat test (high humidity 50 ℃ ± 2 ℃, 100% RH) × 15.5h → (room temperature) × 0.5h → damp heat test (low humidity 35 ℃ ± 3 ℃, 100% RH) × 120h for 7 days.
Wherein, in 1 cycle, the following process is completed by adopting a climate alternation test chamber: high temperature (80 ℃ ± 2 ℃, 80% RH) × 15.5h → (room temperature) × 0.5h → low temperature (-40 ℃ ± 2 ℃) × 7.5h → (room temperature) × 0.5h for 1 day. In 1 cycle, the following procedure was performed using a corrosion alternation proof box: salt spray test × 4h → (room temperature) × 4h → moist heat test (high humidity 50 ℃ ± 2 ℃, 100% RH) × 15.5h → (room temperature) × 0.5h for 5 days. In 1 cycle, a damp-heat test (low humidity 35 ℃. + -. 3 ℃, 100% RH). times.120 h was performed for 1 day using a damp-heat test chamber.
According to the method, the corrosion resistance failure of the radiator is evaluated according to the appearance failure characterization of the aluminum alloy, the weight loss failure characterization of the aluminum alloy and the air tightness test failure characterization after the corrosion test of the radiator. The specific method for evaluation is as follows:
1. aluminum alloy appearance failure characterization
The method mainly evaluates whether the appearance characteristics of the aluminum alloy radiator test sample cause the quality problem of the aluminum alloy radiator after different parts are tested, and judges the quality risk grade according to different test results, wherein the quality risk grade comprises that no brazing connection part has no separation phenomenon and the radiator condenser part is not allowed to have corrosion phenomenon.
The fin corrosion appearance was evaluated as follows: and (3) washing salt or rust attached to the surface of the sample piece after the test with deionized water, soaking the sample piece or the sample piece in 20% oxalic acid solution for a period of time if the surface is corroded seriously and cannot be washed away, washing with the deionized water, immediately drying with clean compressed air, and finishing the evaluation of the sample piece within 15 min. If the sample cannot be evaluated within 15min, the sample is immersed in room temperature deionized water or stored in a vacuum bag. The appearance corrosion evaluation was performed according to the results after the treatment, as shown in Table 1.
TABLE 1 grades of apparent tarnish
| Grade | Corrosion area% |
| Ri 0 | 0 |
| Ri 1 | 0.05 |
| Ri 2 | 0.5 |
| Ri 3 | 1 |
| Ri 4 | 8 |
| Ri 5 | 40～50 |
2. Aluminum alloy weightlessness failure characterization
The method mainly evaluates whether the weightlessness characteristics of the aluminum alloy radiator test sample after different parts of the test cause the quality problem of the aluminum alloy radiator, and judges the quality risk grade according to different test results.
The weight loss was evaluated as follows: and (3) washing salt or rust attached to the surfaces of the radiating fins of the radiator and the condenser sample after the test with deionized water, if the surface is rusted seriously and cannot be washed away, soaking the sample plate or the sample piece in 20% oxalic acid solution for a period of time, washing with deionized water, immediately drying with clean compressed air, and finishing the evaluation of the sample piece within 15 min. If the sample cannot be evaluated within 15min, the sample is immersed in room temperature deionized water or stored in a vacuum bag. Based on the results after treatment, the weight of the sample before the test was compared and evaluated as shown in Table 2.
TABLE 2 weight loss rating
3. Characterization of failure of air tightness test after corrosion test of radiator
The heat sink is resistant to intergranular corrosion, which is a kind of local corrosion, due to its corrosion failure characteristics. And corrosion spreading inward along the interface between the metal grains. Mainly due to the difference in chemical composition between the surface and the interior of the grains and the presence of grain boundary impurities or internal stresses. Intergranular corrosion destroys intergranular bonds, and greatly reduces the mechanical strength of the metal. After corrosion occurs, the surfaces of the metal and the alloy still keep certain metal luster, and the phenomenon of damage cannot be seen, but the bonding force among crystal grains is obviously weakened, the mechanical property is deteriorated, and knocking cannot be withstood, so the corrosion is dangerous, the aluminum alloy radiator has great quality hidden danger, particularly the welding part of a radiator fin and a condenser pipe is observed according to a metallographic microscope, and the phenomenon of intercrystalline corrosion is required to be not allowed.
Thus, the radiator function requirement evaluation: the appearance corrosion grade Ri 1 is realized, and the separation phenomenon at the brazing connection position is avoided; the welding position of the radiator has no corrosion or intercrystalline corrosion phenomenon; the weight loss caused by the plane corrosion or the groove-shaped corrosion of the radiating fins and the condenser tubes is less than 10 percent, and the wall thickness reduction caused by the plane corrosion or the groove-shaped corrosion is not more than 20 percent of the measured wall thickness; after the completion of the 10-cycle test, the radiator was tested for good air tightness (no air leakage at 5bar pressure).
Example 1 examination of corrosion resistance of 6-series aluminum alloy radiator
(1) Test method
Climate alternation test → humid heat test → corrosion alternation test
The climate alternation test adopts a one-steam standard Q/CAM-64.8 climate alternation test method, which comprises the following steps: the test sample is stored for 15.5h in a climate alternation test box with the test temperature of 80 +/-2 ℃, and then stored for 0.5h under the GB/T9278 condition for state adjustment. The same sample is stored in a climate alternation test box with the temperature of minus 40 +/-2 ℃ for 7.5h, and then stored for 0.5h under the GB/T9278 condition for state adjustment, which is 1 climate alternation test period.
The corrosion alternation test adopts a one-steam standard Q/CAM-62.2 cycle corrosion alternation test method, which comprises the following steps: the salt spray test is carried out for 4h according to the test method in the salt spray test which is a corrosion test in an ISO 9227 artificial environment, after the test is finished, the test sample piece is placed in a standard environment (the temperature is 23 +/-2 ℃) or room temperature for 4h for state adjustment, and after the state adjustment is finished, the damp-heat test of high humidity test (50 +/-2 ℃, 100% RH) multiplied by 15.5h → 0.5h (room temperature) is carried out according to the DIN 50017 climate and the test method in the technical application condensation artificial climate, wherein the test period is 1 corrosion alternation test period.
Standard method of Damp-Heat test Low Damp-Heat test (low humidity 35 ℃ C. + -. 3 ℃ C., 100% RH) was carried out according to DIN 50017 climate and its technical application in the test method in condensation artificial climate for 120h, which is 1 Damp-heat test cycle.
(2)10 cycle test
The 1 cycle was: high temperature (80 ℃ ± 2 ℃, 80% RH) × 15.5h → (room temperature) × 0.5h → low temperature (-40 ℃ ± 2 ℃) × 7.5h → (room temperature) × 0.5h → → damp heat test (low humidity 35 ℃ ± 3 ℃, 100% RH) × 120h → salt spray test × 4h → (room temperature) × 4h → damp heat test (high humidity 50 ℃ ± 2 ℃, 100% RH) × 15.5h → (room temperature) × 0.5h for a total of 7 days, 10 cycles for a total of 70 days.
(3) After the 10-cycle test, the radiator has good air tightness test (5bar pressure without air leakage)
Table 36 series aluminum alloy radiator appearance detection results
Table 46 series aluminium alloy radiator fin and condenser tube weightlessness detection result
TABLE 56 series aluminum alloy radiator tightness test results
TABLE 66 Final evaluation of corrosion resistance of aluminum alloy radiators
Example 2 examination of corrosion resistance of 3-series aluminum alloy radiator
(1) Test method
Climate alternation test → humid heat test → corrosion alternation test
(2)10 cycle test
The 1 cycle was: high temperature (80 ℃ ± 2 ℃, 80% RH) × 15.5h → (room temperature) × 0.5h → low temperature (-40 ℃ ± 2 ℃) × 7.5h → (room temperature) × 0.5h → → damp heat test (low humidity 35 ℃ ± 3 ℃, 100% RH) × 120h → salt spray test × 4h → (room temperature) × 4h → damp heat test (high humidity 50 ℃ ± 2 ℃, 100% RH) × 15.5h → (room temperature) × 0.5h for a total of 7 days, 10 cycles for a total of 70 days.
(3) After the 10-cycle test, the radiator has good air tightness test (5bar pressure without air leakage)
TABLE 73 series aluminum alloy radiator appearance test results
Weight loss test result of aluminum alloy radiator fin and condenser tube in meter 83 series
TABLE 93 series aluminum alloy radiator tightness test results
Final evaluation of corrosion resistance of aluminum alloy radiator in Table 103 series
Example 3 examination of corrosion resistance of 4-series aluminum alloy radiator
(1) Test method
Climate alternation test → humid heat test → corrosion alternation test
(2)10 cycle test
The 1 cycle was: high temperature (80 ℃ ± 2 ℃, 80% RH) × 15.5h → (room temperature) × 0.5h → low temperature (-40 ℃ ± 2 ℃) × 7.5h → (room temperature) × 0.5h → → damp heat test (low humidity 35 ℃ ± 3 ℃, 100% RH) × 120h → salt spray test × 4h → (room temperature) × 4h → damp heat test (high humidity 50 ℃ ± 2 ℃, 100% RH) × 15.5h → (room temperature) × 0.5h for a total of 7 days, 10 cycles for a total of 70 days.
(3) After the 10-cycle test, the radiator has good air tightness test (5bar pressure without air leakage)
Appearance test results of aluminum alloy radiator in series of Table 114
Weight loss test result of aluminum alloy radiator fin and condenser tube in series of table 124
TABLE 134 series aluminum alloy radiator tightness test results
Final evaluation of corrosion resistance of aluminum alloy radiator in Table 144 series
The invention adopts a cycle combination test method, the working time of one cycle is 1 week, and the operability is good; particularly relates to three standard test devices, namely a climate alternating test box, a corrosion alternating test box and a damp-heat test box, the test process is controllable, and the repeatability of the test result is good; the failure evaluation relates to the characterization of the internal property change of the radiator (aluminum alloy appearance failure characterization and aluminum alloy weightlessness failure characterization), and can find problems at any time and shorten the test period.
According to the method, the actual corrosion condition of the radiator can be comprehensively simulated through the automobile radiator corrosion test evaluation method, the corrosion failure condition of the radiator in the subsequent use process is reflected through the test result, and the corrosion failure of the radiator is evaluated.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in more detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The method for evaluating the corrosion test of the automobile radiator is characterized by comprising the following steps of:
A. placing an aluminum alloy radiator sample into a climate alternation test chamber, a corrosion alternation test chamber or a damp-heat test chamber according to a corresponding test mode to perform 1 cycle combination test, and repeating the cycle combination test for 6-10 times;
B. evaluation of corrosion resistance failure of the radiator: evaluating whether the quality problem of the aluminum alloy radiator is caused by the appearance and the weightlessness characteristics of the aluminum alloy radiator test sample after the test at different parts, and judging the quality risk level according to different test results; evaluating whether the air tightness meets the requirements after the radiator corrosion test;
C. establishing an evaluation standard:
on the premise that the brazing connection position is not separated and the part of a condenser pipe of the radiator is not corroded, the appearance corrosion grade is divided according to the corrosion area of an aluminum alloy radiator test sample; dividing the weight loss grades according to the mass ratio of the samples before and after the test, wherein the weight loss caused by the plane corrosion or the groove-shaped corrosion of the radiating fins and the condensing tubes is required to be less than 10 percent; according to the corrosion form result observed by a metallographic microscope, the welding part of the radiator fin and the condenser pipe requires that the intergranular corrosion phenomenon is not allowed to occur, and after 10 cycle tests, the air tightness of the radiator is good.
2. The automobile radiator corrosion test evaluation method according to claim 1, characterized in that: step A, the test modes comprise six types, namely a climate alternation test → a damp-heat test → a corrosion alternation test, a climate alternation test → a corrosion alternation test → a damp-heat test, a corrosion alternation test → a climate alternation test → a damp-heat test, a corrosion alternation test → a humidity-heat test → a corrosion alternation test, a damp-heat test → a climate alternation test → a corrosion alternation test and a damp-heat test → a corrosion alternation test → a climate alternation test.
3. The automobile radiator corrosion test evaluation method according to claim 2, characterized in that: in 1 cycle combination test, the climate alternation test comprises the following specific steps: high temperature (80 ℃ ± 2 ℃, 80% RH) × 15.5h → (room temperature) × 0.5h → low temperature (-40 ℃ ± 2 ℃) × 7.5h → (room temperature) × 0.5h for 1 day.
4. The automobile radiator corrosion test evaluation method according to claim 2, characterized in that: in the 1 cycle combination test, the specific steps of the corrosion alternation test are as follows: salt spray test × 4h → (room temperature) × 4h → moist heat test (high humidity 50 ℃ ± 2 ℃, 100% RH) × 15.5h → (room temperature) × 0.5h for 5 days.
5. The automobile radiator corrosion test evaluation method according to claim 2, characterized in that: in 1 cycle combination test, the specific steps of the damp-heat test are as follows: (low humidity 35 ℃ C. + -. 3 ℃ C., 100% RH). times.120 h for 1 day.
6. The automobile radiator corrosion test evaluation method according to claim 1, characterized in that: and step A, repeating the cycle combination test for 10 times.
7. The automobile radiator corrosion test evaluation method according to claim 1, characterized in that: and step C, the grades of the appearance corrosion comprise Ri 0 grade, Ri 1 grade, Ri 2 grade, Ri 3 grade, Ri 4 grade and Ri 5 grade, wherein the corrosion area corresponding to Ri 0 grade is 0 percent, the corrosion area corresponding to Ri 1 grade is 0.05 percent, the corrosion area corresponding to Ri 2 grade is 0.5 percent, the corrosion area corresponding to Ri 3 grade is 1 percent, the corrosion area corresponding to Ri 4 grade is 8 percent, and the corrosion area corresponding to Ri 5 grade is 40-50 percent.
8. The automobile radiator corrosion test evaluation method according to claim 1, characterized in that: and step C, the weight loss grades comprise an LW 0 grade, an LW 1 grade, an LW 2 grade, an LW3 grade, an LW 4 grade and an LW 5 grade, wherein the mass ratio corresponding to the LW 0 grade is 0%, the mass ratio corresponding to the LW 1 grade is 0.5%, the mass ratio corresponding to the LW 2 grade is 1%, the mass ratio corresponding to the LW3 grade is 10%, the mass ratio corresponding to the LW 4 grade is 30%, and the mass ratio corresponding to the LW 5 grade is 70%.
9. The automobile radiator corrosion test evaluation method according to claim 8, characterized in that: when the weight loss grade is divided, the reduction of the wall thickness caused by the plane corrosion or the groove corrosion of the radiating fins and the condensing tubes is required to be not more than 20 percent of the measured wall thickness.
10. The automobile radiator corrosion test evaluation method according to claim 1, characterized in that: and step C, the air tightness of the radiator meets the requirement that the radiator does not leak air under the pressure of 5 bar.
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