CN112285008B - Method for evaluating filiform corrosion resistance of finish turning surface of aluminum wheel - Google Patents
Method for evaluating filiform corrosion resistance of finish turning surface of aluminum wheel Download PDFInfo
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- CN112285008B CN112285008B CN202011122622.3A CN202011122622A CN112285008B CN 112285008 B CN112285008 B CN 112285008B CN 202011122622 A CN202011122622 A CN 202011122622A CN 112285008 B CN112285008 B CN 112285008B
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- 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
Abstract
The invention discloses a method for evaluating filiform corrosion resistance of an aluminum wheel finish turning surface, belonging to automobile surface preventionThe technical field of protection. It comprises the following steps: 1) Stone impact test; 2) Neutral salt spray test; 3) First measuring the expansion etching width K of the finish turning surface of the aluminum wheel 1 The method comprises the steps of carrying out a first treatment on the surface of the 4) Copper accelerated acetate salt spray test; 5) Measuring the corrosion width K of the finish turning surface of the aluminum wheel for the second time 2 . Through the evaluation method designed by the invention and the combination of after-sales researches, when the thickness of the paint film at the edge of the finish turning surface of the aluminum wheel is more than or equal to 30 mu m, the evaluation method designed by the invention obtains the expansion width K of the finish turning surface of the aluminum wheel 1 And K 2 All are smaller than or equal to 1.5mm, and the filiform corrosion phenomenon of the finish turning surface of the aluminum wheel is not found after sale, so the evaluation method designed by the invention has better guiding suggestion on the production and after sale of the aluminum wheel.
Description
Technical Field
The invention relates to an evaluation method of paint performance on the surface of an automobile wheel, belongs to the technical field of automobile surface protection, and particularly relates to a method for evaluating filiform corrosion resistance of a finish turning surface of an aluminum wheel.
Background
Because of the light weight requirement of the vehicle, almost all of the passenger car wheels in China at present adopt aluminum alloy hubs, and because of attractive appearance and performance requirements, part of hub spoke surfaces of the aluminum wheels adopt a finish turning and varnish coating technology, and other areas adopt full paint coatings. However, the finish surface of aluminum wheels is susceptible to quality problems of filiform corrosion after sale, which has become one of the main problems of retrospective sales and customer complaints in recent years.
The method for evaluating the corrosion resistance of the paint coating of the aluminum wheel adopted at present by the domestic main machine factory is as follows: (1) Carrying out a cross-over and acid salt spray test on the finish turning paint coating; (2) And (5) carrying out stone impact and short-time salt spray tests on the paint sample plate coated along with the line. The operation modes can rapidly evaluate the paint coating performance of the aluminum wheel, but have a plurality of defects, such as experiments are carried out on paint templates, the paint process is evaluated, the actual use working conditions of the after-market wheel are greatly different, the paint templates have no coating non-uniformity caused by part modeling problems, the test results obtained by adopting the evaluation method are not typical, and therefore, the filiform corrosion resistance of the finish turning aluminum wheel edge coating under the actual working conditions cannot be effectively evaluated.
At present, the corrosion test of the actual working condition of the whole vehicle road is considered as the most effective evaluation method, but the method has long period, high cost and lag nodes, can not effectively evaluate the quality risk of the part in the development stage, and can not provide constructive guidance for actual production.
In view of the foregoing, in view of environmental protection, efficiency, cost, and the like, and in view of practical production, there is a need to develop a new method for rapidly and effectively evaluating the filiform corrosion resistance of a wheel edge coating by using an enhanced corrosion environment simulation technique.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a method for evaluating the filiform corrosion resistance of the finish turning surface of an aluminum wheel, which can simulate the state that the wheel is beaten by stones in actual running and can be used for reinforcing the corrosion through a test box, so that the filiform corrosion resistance of a coating is rapidly evaluated, and a better guiding suggestion is provided for the production and after-sale of the aluminum wheel.
In order to achieve the technical aim, the invention discloses a method for evaluating the filiform corrosion resistance of an aluminum wheel finish turning surface, which comprises the following steps:
1) Stone impact test:
adopting a stone impact instrument to spray iron shot particles with the total mass of 500 g+/-2 g to an aluminum wheel finish turning surface, wherein a nozzle of the stone impact instrument is attached to the aluminum wheel finish turning surface, and the spraying pressure of the stone impact instrument is controlled to be between 0.95 and 1.05 bar; spraying for 8-10 s;
removing residual scrap iron and paint on the finish turning surface of the aluminum wheel after the stone impact test by using an adhesive tape, and continuing washing and airing;
2) Neutral salt spray test:
placing the aluminum wheel treated in the step 1) into a neutral salt fog box for 1000h of uninterrupted salt fog test, and controlling the pH value of NaCl solution in the neutral salt fog box to be 6.0-7.5 and the temperature to be 33-37 ℃; washing with water and airing after the test is finished;
3) First measuring the expansion etching width K of the finish turning surface of the aluminum wheel 1 : measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel processed in the step 2), and calculating the expansion width K 1 When K is 1 Judging that the preamble process of the aluminum wheel is unqualified when the diameter is more than 1.5 mm; when K is 1 Continuing the following steps until the thickness is less than or equal to 1.5 mm;
4) Copper accelerated acetate spray test:
placing the aluminum wheel treated in the step 1) into a copper acceleration acetic acid salt fog box for 72 hours of uninterrupted salt fog test, and controlling the pH value of NaCl solution in the copper acceleration acetic acid salt fog box to be 2.9-3.1 and the temperature to be 48-52 ℃;
washing with water and airing after the test is finished; standing in an environment box for a period of time, and controlling the relative humidity in the environment box to be 48-52% and the temperature to be 23-26 ℃;
5) Measuring the corrosion width K of the finish turning surface of the aluminum wheel for the second time 2 : measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel after the treatment in the step 4), and calculating the expansion width K 2 When K is 2 More than 1.5mm, judging that the preamble process of the aluminum wheel is unqualified, and when K is 2 And (5) continuing the following steps.
Further, in the step 1), the iron shot particles are particles with the average diameter controlled to be 4-5 mm after quenching treatment, and the Rockwell hardness of the particles is 61-65.
Further, in the step 1), the cleaning treatment comprises the steps of sticking the adhesive tape on the finish turning surface of the aluminum wheel after the stone impact test, tearing off the adhesive tape at an angle of 60 degrees with the finish turning surface of the aluminum wheel, wherein the adhesive tape meets 600-750 g/cm when measured according to the NF EN 1939 standard.
Further, in the step 1), deionized water is used for washing the finish turning surface of the aluminum wheel after the stone impact test, the washing pressure is 80-110 bar, the temperature is 20-50 ℃, the conductivity of the washed deionized water is less than or equal to 20 mu s/cm, and the washed aluminum wheel is dried at normal temperature.
Further, in the step 2), the mass percentage concentration of the NaCl solution in the neutral salt fog box is 4.5-5.5%, copper and nickel are not contained, and the total impurity is not more than 0.2%.
Further, in the step 2), deionized water with the conductivity less than or equal to 20 mu s/cm is used for continuously flushing for 10min, the flushing pressure is 80-110 bar, the temperature is 20-50 ℃, and then the water is dried at normal temperature.
Further, in the step 4), the mass percentage concentration of the NaCl solution in the copper acceleration acetate fog box is 4.5-5.5%, copper and nickel are not contained, the total impurity is not more than 0.4%, and the concentration of the cupric chloride in the NaCl solution is 0.24-0.28 g/L.
Further, in the step 4), deionized water with the conductivity less than or equal to 20 mu s/cm is adopted for 10min, the flushing pressure is 80-110 bar, the temperature is 20-50 ℃, and then the water is dried at normal temperature.
Further, in step 3), the etching width K 1 The calculation process of (2) is as follows:
measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel, and selecting the longest expansion line for measurement as d 1 The length of the original stone striking pit is d 2 Then K is 1 ＝(d 1 -d 2 )；
In step 3), the etching width K 2 The calculation process of (2) is as follows:
measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel, and selecting the longest expansion line for measurement as d 3 The length of the original stone striking pit is d 2 Then K is 2 ＝(d 3 -d 2 )。
Further, the stone hammer instrument comprises a feed inlet, a feed pipe and a spraying pipe communicated with the feed pipe, a vibrating table is further arranged at the joint of the feed pipe and the spraying pipe, one end of the spraying pipe is connected with a gas pipe, a pneumatic valve is further arranged at the joint of the spraying pipe and the gas pipe, the other end of the spraying pipe is connected with a nozzle, and a collecting hopper is arranged at the bottom end of the nozzle.
The beneficial effects are that:
the evaluation method designed by the invention can simulate the state of the wheel bearing the impact of stones in actual running, rapidly evaluate the filiform corrosion resistance of the coating by a method of reinforcing corrosion of a test box, and provide better guiding advice for the production and after-sale of the aluminum wheel on the basis of reducing the evaluation period.
Drawings
FIG. 1 is a schematic diagram of a stone impact instrument used in the present invention;
FIG. 2 is a schematic view of the damage level after stone impact of the finish turning surface of the aluminum wheel;
FIG. 3 is a schematic diagram of the measurement of the edge filiform corrosion expansion width of the finish turning surface of an aluminum wheel.
Wherein, each part numbers in fig. 1 are as follows:
feed inlet 1, inlet pipe 2, spout material pipe 3, shaking table 4, gas-supply pipe 5, pneumatic valve 6, nozzle 7, collecting hopper 8, handle 9.
Detailed Description
The invention discloses a method for evaluating filiform corrosion resistance of a finish turning surface of an aluminum wheel, wherein the aluminum wheel is in a final processing state with the finish turning surface and a full coating, and has no auxiliary parts such as a wheel cover, a valve core, an outer tire, a balance weight and the like. The aluminum wheel was subjected to the following test:
it comprises the following steps:
1) Stone impact test: the hand-held stone hammer instrument shown in fig. 1 is adopted to carry out stone hammer test on the aluminum wheel finish turning surface, and comprises a feed inlet 1, a feed pipe 2 and a spraying pipe 3 communicated with the feed pipe 2, wherein a vibrating table 4 is further arranged at the joint of the feed pipe 2 and the spraying pipe 3, one end of the spraying pipe 3 is connected with a gas pipe 5, a pneumatic valve 6 is further arranged at the joint of the spraying pipe 3 and the gas pipe 5, the other end of the spraying pipe 3 is connected with a nozzle 7, a collecting hopper 8 is arranged at the bottom end of the nozzle 7, the specific shape of the nozzle 7 is designed according to different spoke shapes of the aluminum wheel, and the nozzles with various shapes are all in the protection scope of the invention. At the same time, in order to facilitate the holding of the stone impact instrument, the invention also selects to arrange a handle 9 on the spraying pipe 3.
The working process of the handheld stone hammer comprises the following steps: 1. connecting the gas pipe to the compressed air while the air pressure valve is kept in a closed state; 2. pouring the iron pellets into a feed inlet to uniformly stack the iron pellets on a platform at the lower end of a feed pipe; 3. the stone hammer is held by hand and the nozzle is tightly attached to the surface of the finish turning surface of the spoke; 4. adjusting the air pressure valve to a required pressure value; 5. beginning to spray the iron shot; 6. recovering the iron shot after the spraying is finished; 7. closing the pressure valve; 8. the compressed air is turned off. The hand-held stone hammer instrument designed by the invention can truly simulate the state of the wheel bearing stone striking in actual running, and is convenient to operate.
Since the injection pressure controlled by the air pressure valve 6 of the hand-held stone hammer has an influence on the operation speed of the injected material, and the operation speed of the injected material can simulate the state that the wheel is hit by stones in actual running, the injection pressure controlled by the air pressure valve 6 is preferably 0.95-1.05 bar, and the pressure of compressed air introduced by the air pipe 5 is preferably 6-10 bar.
The invention also preferably adopts the iron shot particles with the average diameter controlled to be 4-5 mm after quenching treatment, the Rockwell hardness of the particles is 61-65, and the total mass is 500 g+/-2 g.
After the stone impact test, the aluminum wheel finish turning surface has a damage level schematic diagram shown in fig. 2, wherein the damage degree of fig. 2a is 5%, the damage degree of fig. 2b is 10%, the damage degree of fig. 2c is 15%, and the damage degree of fig. 2d is 20%; and the invention preferably simulates the most common urban and suburban road conditions, and the damage level corresponding to the vehicle speed of 60-80 km/h is shown in figure 2 b.
In order to successfully carry out subsequent tests, the invention selects to carry out cleaning treatment on the aluminum wheel finish turning surface after the stone impact test so as to remove residual scrap iron and paint on the aluminum wheel finish turning surface, and specifically comprises the steps of sticking an adhesive tape on the aluminum wheel finish turning surface after the stone impact test, tearing off the adhesive tape at an angle of 60 degrees with the aluminum wheel finish turning surface, wherein the adhesive tape meets 600-750 g/cm when measured according to NF EN 1939 standard. And then continuously using deionized water to wash the finish turning surface of the aluminum wheel after the stone impact test, wherein the washing pressure is 80-110 bar, the temperature is 20-50 ℃, the electric conductivity of the washed deionized water is less than or equal to 20 mu s/cm, and the washed aluminum wheel is dried at normal temperature. The cleaning method can effectively remove the residual aluminum scraps in the stone-hit pit, and meanwhile, the deionized water is used, so that impurity elements such as Ca which influence the subsequent salt spray corrosion test cannot be introduced 2+ 、Cl - 、SO 4 2- Root plasma.
2) Neutral salt spray test: placing the aluminum wheel treated in the step 1) into a neutral salt fog box for 1000h of uninterrupted salt fog test, and controlling the pH value of NaCl solution in the neutral salt fog box to be between 6.0 and 7.5 and the temperature to be between 33 and 37 ℃;
washing with water and airing after the test is finished;
specifically, each component such as salt solution, spray chamber, heating device, spraying equipment, salt fog collector is equipped with in the neutral salt fog case, and their function and operating parameter requirement are as follows:
salt solution: the NaCl solution with the mass percentage concentration of 4.5-5.5% is prepared by selecting deionized water with the conductivity less than or equal to 20 mu s/cm at the temperature of (20+/-2) ℃ to prepare anhydrous sodium chloride, wherein the total impurities in the anhydrous sodium chloride are not more than 0.2%, copper and nickel are not required to be contained, or the content of each element is less than 10 mg/kg, and the pH value of the homogenized NaCl solution is between 6.0 and 7.5.
Spray chamber: the material of which the device is first constructed and the location where the device can be contacted with the saline solution should be inert to the saline solution. At the same time, the minimum volume of the spray chamber is 0.4m 3 The size of the spray chamber must be such that the pooling of solution within a 10cm diameter horizontal area is limited to 1-2 mL/h.
Heating device: the spray chamber temperature was maintained at a steady level of 33-37 c using a suitable heating device such as a saturated tower heater, and the spray chamber temperature was checked and recorded daily.
Spraying equipment: a compressed air supply system is provided and the injection pressure is between 0.8 and 1.6bar, said compressed air being filtered before entering the atomizer and then humidified by means of an air saturation column at 44-48 ℃.
Salt fog collector: a measuring cylinder with the specification of 100mL is selected to be matched with a funnel with the diameter of 10cm, and the open surface area of the funnel is about 80cm 2 Both must be made of inert material, and the funnel must not be covered above and parallel to the surface of the test sample as much as possible, and at least two salt spray collectors are placed in the spray chamber and the collection amount is tracked daily.
The neutral salt spray test conditions designed by the invention are strict, the corrosion condition of the surface of the finish turning surface of the aluminum wheel can be well evaluated, and meanwhile, samples with different edge paint film thicknesses, such as 10 mu m, 20 mu m, 30 mu m, 40 mu m and 50 mu m, are found after the test method is adopted: the storage state of the neutral salt fog for 1000 hours is a critical state of filiform corrosion expansion in an intensified environment, after the time of the neutral salt fog exceeds 1000 hours, the expansion of the filiform corrosion tends to be unstable, and the test data does not have obvious reference value.
After the neutral salt spray test is completed, the aluminum wheel is taken out, and is continuously washed for 10min by deionized water with the conductivity less than or equal to 20 mu s/cm, the washing pressure is 80-110 bar, the temperature is 20-50 ℃, and then the aluminum wheel is dried at normal temperature.
3) First measuring the expansion etching width K of the finish turning surface of the aluminum wheel 1 : the width of the etch-back K is shown in FIG. 3 1 The calculation process is as follows:
measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel, and selecting the longest expansion line for measurement as d 1 The length of the original stone striking pit is d 2 Then K is 1＝ d 1 -d 2 。
When K is 1 If the diameter is more than 1.5mm, directly judging that the product is unqualified; when K is less than or equal to 1.5mm, continuing the following steps;
4) Copper accelerated acetate spray test: placing the aluminum wheel treated in the step 1) into a copper acceleration acetic acid salt fog box for 72 hours of uninterrupted salt fog test, and controlling the pH value of NaCl solution in the copper acceleration acetic acid salt fog box to be 2.9-3.1 and the temperature to be 48-52 ℃; washing with water and airing after the test is finished; standing in an environment box for a period of time, and controlling the relative humidity in the environment box to be 48-52% and the temperature to be 23-26 ℃;
wherein, each part such as salt solution, spray chamber, heating device, spraying equipment, salt fog collector are equipped with in the copper acceleration acetic acid salt fog case, and their function and operating parameter requirement are as follows:
salt solution: the NaCl solution with the mass percentage concentration of 4.5-5.5% is deionized at the temperature of (20+/-2) ℃ and the conductivity is less than or equal to 20 mu s/cm to prepare anhydrous sodium chloride, wherein the total impurities in the anhydrous sodium chloride are not more than 0.4%, copper and nickel are not required, or the content of each element is not more than 10 mg/kg. Adding proper amount of cupric chloride dihydrate into the prepared NaCl solution, and the concentration after dissolution is 0.24-0.28 g/L. And finally adding a proper amount of glacial acetic acid into the NaCl solution to ensure that the pH value of the NaCl solution is between 2.9 and 3.1.
Spray chamber: the materials comprising the device and the locations where the device can contact the saline solution should be inert to the solution. And the minimum volume of the spray chamber is 0.2m 3 Preferably greater than 0.4m 3 . The size of the spray chamber must be such that the pooling of a 10cm diameter horizontal area of solution is limited to 1mL/h to 2mL/h.
Heating device: the spray chamber temperature was maintained at 50 c 2c steadily using a suitable heating device, such as saturated tower heating, and the spray chamber temperature was checked and recorded daily.
Spraying equipment: the composition of the material is as follows: a clean air supply system with controlled pressure and humidity; a container containing a solution to be atomized and one or more atomizers of a corrosion resistant material. Compressed air is provided for the atomizer through a filter capable of removing any solid matters or oil agents, the pressure is 70-170 KPa, and the air is heated and humidified through an air saturation tower at 53-57 ℃ before entering the atomizer.
Salt fog collector: a measuring cylinder of 100mL specification, with a diameter of 10cm and an open surface area of about 80cm 2 Both of which must be made of inert material, are not shielded above the funnel and are as parallel as possible to the surface of the test sample, at least two collectors are placed in the spray chamber and the collection is tracked daily.
After the copper accelerated acetate salt spray test is finished, taking out the aluminum wheel, adopting deionized water with the conductivity less than or equal to 20 mu s/cm for 10min, flushing at 80-110 bar and at 20-50 ℃, and then airing at normal temperature.
And placing the dried aluminum wheels in an environment box for standing for 4 weeks. The environmental chamber should be a minimum volume of 0.5m 3 The sealed chamber of the device is kept in the atmosphere, the relative humidity is 48-52%, and the temperature is 23-26 ℃. The temperature and humidity of the environmental chamber should be monitored every day. This stepThe static treatment is completed in an environment box, CASS acid corrosion is only the first step, and due to the short time, corrosion starting points can only be generated in scratched areas, and in the static process, corrosion can be further expanded due to the fact that a large amount of corrosion medium is still contained in an acid corrosion pit, and the corrosion resistance of finish paint can be evaluated after the stage is completed.
The copper acceleration acetate fog test conditions designed by the invention are strict, the corrosion condition of the surface of the finish turning surface of the aluminum wheel can be well evaluated, and meanwhile, samples with different edge paint film thicknesses, such as 10 mu m, 20 mu m, 30 mu m, 40 mu m and 50 mu m, are found after the test method is adopted: the storage state of the copper accelerated acetate fog for 72h is a critical state of filiform corrosion expansion in a reinforced environment, and after the storage state exceeds 72h, the filiform corrosion expansion tends to be unstable, and the test data does not have obvious reference value.
5) Measuring the corrosion width K of the finish turning surface of the aluminum wheel for the second time 2 ：
Measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel after the treatment in the step 4), and calculating the expansion width K 2 Measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel, and selecting the longest expansion line for measurement as d 3 The length of the original stone striking pit is d 2 Then K is 1＝ d 3 -d 2 。
When K is 2 1.5mm, which indicates that the precursor production process of the aluminum wheel is unqualified, when K 2 And less than or equal to 1.5mm, which indicates that the prior production process of the aluminum wheel is qualified.
In order to further verify the effectiveness of the evaluation method, the invention also counts the filiform corrosion condition of a large number of aluminum wheel finish turning surfaces fed back after sale, and when the thickness of a paint film at the edge of the aluminum wheel finish turning surface is more than or equal to 30 mu m, the evaluation method designed by the invention obtains the corrosion width K of the aluminum wheel finish turning surface 1 And K 2 All are smaller than or equal to 1.5mm, and the filiform corrosion phenomenon of the finish turning surface of the aluminum wheel is not found after sale, so the evaluation method designed by the invention has better guiding suggestion on the production and after sale of the aluminum wheel.
Examples
In order to further explain that the evaluation method designed by the invention has guiding significance for actual aluminum wheel production, the embodiment explores the aluminum wheel finish turning surface simulation stone impact and salt spray tests with different edge paint film thicknesses, and the obtained corrosion conditions are shown in table 1;
TABLE 1 corrosion conditions of finish turning surfaces of aluminum wheels with different paint film thicknesses
As can be seen from the above embodiments, the evaluation method designed by the present invention is closely related to the actual production of the aluminum wheel, and the accuracy of the final evaluation result is good.
Claims (9)
1. A method for evaluating filiform corrosion resistance of a finish turning surface of an aluminum wheel, characterized by: it comprises the following steps:
1) Stone impact test: adopting a stone impact instrument to spray iron shot particles with the total mass of 500 g+/-2 g to an aluminum wheel finish turning surface, wherein a nozzle of the stone impact instrument is attached to the aluminum wheel finish turning surface, and the spraying pressure of the stone impact instrument is controlled to be between 0.95 and 1.05 bar; spraying for 8-10 s;
removing residual scrap iron and paint on the finish turning surface of the aluminum wheel after the stone impact test by using an adhesive tape, and continuing washing and airing;
2) Neutral salt spray test: placing the aluminum wheel treated in the step 1) into a neutral salt fog box for 1000h of uninterrupted salt fog test, and controlling the pH value of NaCl solution in the neutral salt fog box to be 6.0-7.5 and the temperature to be 33-37 ℃; washing with water and airing after the test is finished;
3) First measuring the expansion etching width K of the finish turning surface of the aluminum wheel 1 : measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel processed in the step 2), and calculating the expansion width K 1 When K is 1 Judging that the preamble process of the aluminum wheel is unqualified when the diameter is more than 1.5 mm; when K is 1 Continuing the following steps until the thickness is less than or equal to 1.5 mm;
in step 3), the etching width K 1 The calculation process of (2) is as follows:
measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel, and selecting the longest expansion line for measurement as d 1 Original (1)The length of the initial stone striking pit is d 2 Then K is 1 ＝(d 1 -d 2 )；
4) Copper accelerated acetate spray test: placing the aluminum wheel treated in the step 1) into a copper acceleration acetic acid salt fog box for 72 hours of uninterrupted salt fog test, and controlling the pH value of NaCl solution in the copper acceleration acetic acid salt fog box to be 2.9-3.1 and the temperature to be 48-52 ℃;
washing with water and airing after the test is finished; standing in an environment box for a period of time, and controlling the relative humidity in the environment box to be 48-52% and the temperature to be 23-26 ℃;
5) Measuring the corrosion width K of the finish turning surface of the aluminum wheel for the second time 2 : measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel after the treatment in the step 4), and calculating the expansion width K 2 When K is 2 More than 1.5mm, judging that the preamble process of the aluminum wheel is unqualified, and when K is 2 The diameter is less than or equal to 1.5mm, which indicates that the preamble production process of the aluminum wheel is qualified; in step 5), the etching width K 2 The calculation process of (2) is as follows:
measuring the edge filiform corrosion expansion width of the finish turning surface of the aluminum wheel, and selecting the longest expansion line for measurement as d 3 The length of the original stone striking pit is d 2 Then K is 2 ＝(d 3 -d 2 )。
2. The method for evaluating filiform corrosion resistance of an aluminum wheel finish turning surface according to claim 1, wherein: in the step 1), the iron shot particles are particles with the average diameter controlled to be 4-5 mm after quenching treatment, and the Rockwell hardness of the particles is 61-65.
3. The method for evaluating filiform corrosion resistance of an aluminum wheel finish turning surface according to claim 2, wherein: in the step 1), the cleaning treatment comprises the steps of sticking the adhesive tape on the finish turning surface of the aluminum wheel after the stone impact test, tearing off the adhesive tape at an angle of 60 degrees with the finish turning surface of the aluminum wheel, and meeting 600-750 g/cm when the adhesive tape is measured according to NF EN 1939 standard.
4. A method for evaluating filiform corrosion resistance of an aluminum wheel finish turning surface according to any one of claims 1 to 3, characterized in that: in the step 1), deionized water is used for washing the finish turning surface of the aluminum wheel after the stone impact test, the washing pressure is 80-110 bar, the temperature is 20-50 ℃, the conductivity of the washed deionized water is less than or equal to 20 mu s/cm, and the washed aluminum wheel is dried at normal temperature.
5. The method for evaluating filiform corrosion resistance of an aluminum wheel finish turning surface according to claim 1, wherein: in the step 2), the mass percentage concentration of the NaCl solution in the neutral salt fog box is 4.5-5.5%, copper and nickel are not contained, and the total impurity is not more than 0.2%.
6. The method for evaluating filiform corrosion resistance of an aluminum wheel finish turning surface of claim 5, wherein: in the step 2), deionized water with the conductivity less than or equal to 20 mu s/cm is used for continuously flushing for 10min, the flushing pressure is 80-110 bar, the temperature is 20-50 ℃, and then the water is dried at normal temperature.
7. The method for evaluating filiform corrosion resistance of an aluminum wheel finish turning surface according to claim 1, wherein: in the step 4), the mass percentage concentration of the NaCl solution in the copper acceleration acetate fog box is 4.5-5.5%, copper and nickel are not contained, the total impurity is not more than 0.4%, and the concentration of the cupric chloride in the NaCl solution is 0.24-0.28 g/L.
8. The method for evaluating filiform corrosion resistance of an aluminum wheel finish turning surface of claim 7, wherein: in the step 4), deionized water with the conductivity less than or equal to 20 mu s/cm is used for continuously flushing for 10min, the flushing pressure is 80-110 bar, the temperature is 20-50 ℃, and then the water is dried at normal temperature.
9. The method for evaluating filiform corrosion resistance of an aluminum wheel finish turning surface according to claim 1, wherein: the stone hammer instrument comprises a feed inlet, a feed pipe and a spraying pipe communicated with the feed pipe, a vibrating table is further arranged at the joint of the feed pipe and the spraying pipe, one end of the spraying pipe is connected with a gas pipe, a pneumatic valve is further arranged at the joint of the spraying pipe and the gas pipe, the other end of the spraying pipe is connected with a nozzle, and a collecting hopper is arranged at the bottom end of the nozzle.
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| CN107144524A (en) * | 2017-05-22 | 2017-09-08 | 吉利汽车研究院（宁波）有限公司 | Body test cabin accelerated corrosion test method |
| CN108562532A (en) * | 2018-03-21 | 2018-09-21 | 江苏法尔胜材料分析测试有限公司 | A kind of quantitative evaluation method of steel wire coating corrosion resistance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814026A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | A kind of clad plate corrosion resisting property method for rapidly testing |
| CN105784578A (en) * | 2016-03-22 | 2016-07-20 | 全球能源互联网研究院 | Detection method for simulating accelerated corrosion of metal material in atmospheric environment |
| CN107144524A (en) * | 2017-05-22 | 2017-09-08 | 吉利汽车研究院（宁波）有限公司 | Body test cabin accelerated corrosion test method |
| CN108562532A (en) * | 2018-03-21 | 2018-09-21 | 江苏法尔胜材料分析测试有限公司 | A kind of quantitative evaluation method of steel wire coating corrosion resistance |
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