CN112285008A - 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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- CN112285008A CN112285008A CN202011122622.3A CN202011122622A CN112285008A CN 112285008 A CN112285008 A CN 112285008A CN 202011122622 A CN202011122622 A CN 202011122622A CN 112285008 A CN112285008 A CN 112285008A
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- 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 a finish turning surface of an aluminum wheel, and belongs to the technical field of automobile surface protection. It comprises the following steps: 1) carrying out stone impact test; 2) neutral salt spray test; 3) first measuring aluminum wheel finish turning surface expanding corrosion width K1(ii) a 4) Copper accelerated acetate spray test; 5) second measurement of the aluminum wheel finish turning surface expanding corrosion width K2. The evaluation method designed by the invention is combined with after-sale researches to find that when the thickness of a paint film on the edge of the finish turning surface of the aluminum wheel is more than or equal to 30 mu m, the finish turning surface of the aluminum wheel obtained by the evaluation method designed by the invention has the expanded corrosion width K1And K2The thickness of the aluminum wheel is less 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 guidance and 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 finished automobile surface of an aluminum wheel.
Background
Due to the requirement of light weight of vehicles, almost all domestic passenger vehicle wheels adopt aluminum alloy hubs at present, and due to the requirements on attractiveness and performance, the technology of finish turning and varnish coating is adopted on the spoke surfaces of part of aluminum wheel hubs, and full paint coatings are adopted in other areas. However, finished surfaces of aluminum wheels are prone to the quality problem of filiform corrosion after sale, which has become one of the major problems of after-sale return and customer complaints in recent years.
The corrosion resistance evaluation methods of the paint coating of the aluminum wheel adopted by domestic main engine plants at present are the following two modes: (1) performing a cross cutting and acid salt spray test on the finish turning paint coating; (2) and carrying out stone impact and short-time salt spray tests on the paint sample plate coated along with the line. The operation modes can quickly evaluate the paint coating performance of the aluminum wheel, but have a plurality of defects, for example, experiments are carried out on a paint sample plate, the evaluation on the paint process is carried out, the difference between the actual use working condition of the sold wheel and the actual use working condition of the sold wheel is larger, the paint sample plate has no coating nonuniformity caused by part modeling problems, so that the test result obtained by adopting the evaluation method has no typical representativeness, and the filiform corrosion resistance of the edge coating of the finish-turned aluminum wheel under the actual working condition cannot be effectively evaluated.
At present, the corrosion test of the actual working condition of the whole vehicle road is considered to be the most effective evaluation method, but the method has the advantages of long period, high cost and node lag, cannot effectively evaluate the quality risk of the part development stage, and cannot provide a constructive guidance suggestion for the actual production.
In view of the above, both from the aspects of environmental protection, efficiency, cost, and practical production, there is a need to develop a novel method for rapidly and effectively evaluating filiform corrosion resistance of the wheel edge coating by using a simulation technique of enhanced corrosion environment.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a method for evaluating filiform corrosion resistance of a finish turning surface of an aluminum wheel, which can simulate the state that the wheel bears stone impact in actual running and can rapidly evaluate the filiform corrosion resistance of a coating by a method of strengthening corrosion in a test box, thereby providing better guidance suggestions for production and after-sale of the aluminum wheel.
In order to achieve the technical purpose, the invention discloses a method for evaluating filiform corrosion resistance of a finish turning surface of an aluminum wheel, which comprises the following steps:
1) stone impact test:
spraying iron shot particles with the total mass of 500g +/-2 g to the finish turning surface of the aluminum wheel by using a stone-beating instrument, wherein a nozzle of the stone-beating instrument is attached to the finish turning surface of the aluminum wheel, and the spraying pressure of the stone-beating instrument is controlled to be 0.95-1.05 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 continuously washing and drying;
2) neutral salt spray test:
placing the aluminum wheel treated in the step 1) in a neutral salt fog box to perform an uninterrupted salt fog test for 1000h, and controlling the pH value of a NaCl solution in the neutral salt fog box to be 6.0-7.5 and the temperature to be 33-37 ℃; after the test is finished, washing and drying;
3) first measuring aluminum wheel finish turning surface expanding corrosion width K1: measuring the filiform corrosion expansion width of the edge of the finish turning surface of the aluminum wheel processed in the step 2), and calculating the expansion corrosion width K1When K is1If the thickness is more than 1.5mm, judging that the preorder process of the aluminum wheel is unqualified; when K is1Less than or equal to 1.5mm, and continuing the following steps;
4) copper accelerated acetate spray test:
placing the aluminum wheel treated in the step 1) in a copper accelerated acetate fog box for a 72-hour uninterrupted salt fog test, and controlling the pH value of a NaCl solution in the copper accelerated acetate fog box to be 2.9-3.1 and the temperature to be 48-52 ℃;
after the test is finished, washing and drying; standing the mixture 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) second measurement of the aluminum wheel finish turning surface expanding corrosion width K2: measuring the filiform corrosion expansion width of the edge of the finish turning surface of the aluminum wheel processed in the step 4), and calculating the expansion corrosion width K2When K is2Greater than 1.5mm, JuUnqualified preorder process of aluminum wheel, when K2Less than or equal to 1.5mm, and continuing the following steps.
Further, in the step 1), the iron shot particles are particles with the average diameter controlled within 4-5 mm after quenching treatment, and the Rockwell hardness of the particles is 61-65.
Further, in step 1), clear away and handle including pasting the sticky tape in the smart car face of aluminum wheel after the stone impact test to with the smart car face of aluminum wheel is the angle of 60 and tears the sticky tape off, when the sticky tape is measured according to NF EN 1939 standard, satisfy 600 ~ 750 g/cm.
Further, in the step 1), washing the finish turning surface of the aluminum wheel after the stone impact test by using deionized water at the washing pressure of 80-110 bar and the temperature of 20-50 ℃ until the conductivity of the washed deionized water is less than or equal to 20 mu s/cm, and drying the washed aluminum wheel at normal temperature.
Further, in the step 2), the mass percentage concentration of the NaCl solution in the neutral salt spray box is 4.5-5.5%, copper and nickel are not contained, and the total impurities are not more than 0.2%.
Further, in the step 2), deionized water with the conductivity of less than or equal to 20 mu s/cm is adopted for continuously washing for 10min, the washing pressure is 80-110 bar, the temperature is 20-50 ℃, and then the drying is carried out at normal temperature.
Further, in the step 4), the mass percentage concentration of a NaCl solution in the copper-accelerated acetate fog tank is 4.5-5.5%, copper and nickel are not contained, total impurities do not exceed 0.4%, and the concentration of copper chloride in the NaCl solution is 0.24-0.28 g/L.
Further, in the step 4), deionized water with the conductivity of less than or equal to 20 mu s/cm is adopted for lasting for 10min, the washing pressure is 80-110 bar, the temperature is 20-50 ℃, and then the drying is carried out at normal temperature.
Further, in step 3), the expanding etching width K1The calculation process of (2) is as follows:
measuring the filiform corrosion expanding corrosion width of the edge of the finish turning surface of the aluminum wheel, and selecting the longest expansion line to measure d1The length of the original stone pit is d2Then K is1＝(d1-d2)；
In step 3), the expanding etching width K2The calculation process of (2) is as follows:
measuring the filiform corrosion expanding corrosion width of the edge of the finish turning surface of the aluminum wheel, and selecting the longest expansion line to measure d3The length of the original stone pit is d2Then K is2＝(d3-d2)。
Furthermore, the stone impact instrument comprises a feed inlet, a feed pipe and a material spraying pipe communicated with the feed pipe, a vibration table is further arranged at the joint of the feed pipe and the material spraying pipe, one end of the material spraying pipe is connected with a gas pipe, a gas pressure valve is further arranged at the joint of the material spraying pipe and the gas pipe, the other end of the material spraying pipe is connected with a nozzle, and a material collecting hopper is arranged at the bottom end of the nozzle.
Has the advantages that:
the evaluation method designed by the invention can simulate the state that the wheel bears the stone impact in actual running, quickly evaluate the filiform corrosion resistance of the coating by a test box corrosion strengthening method, and provide better guidance suggestions for the production and after-sale of the aluminum wheel on the basis of reducing the evaluation period.
Drawings
FIG. 1 is a schematic structural view of a stone-impact instrument used in the present invention;
FIG. 2 is a schematic diagram of damage levels after stone impact on the finish turning surface of an aluminum wheel;
FIG. 3 is a schematic view of the measurement of the filiform corrosion spread-out width of the edge of the finish turning surface of the aluminum wheel.
Wherein, the numbering of each part in fig. 1 is as follows:
the device comprises a feed inlet 1, a feed pipe 2, a material spraying pipe 3, a vibration table 4, a gas transmission pipe 5, a pneumatic valve 6, a nozzle 7, a material collecting hopper 8 and a 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 is free of accessory parts such as a wheel cover, a valve core, an outer cover and a balance block. The aluminum wheel was tested as follows:
it comprises the following steps:
1) stone impact test: the hand-held stone-beating instrument shown in fig. 1 is adopted to carry out stone-beating test on the finish turning surface of the aluminum wheel, and comprises a feeding port 1, a feeding pipe 2 and a spraying pipe 3 communicated with the feeding pipe 2, wherein a vibration table 4 is further arranged at the joint of the feeding pipe 2 and the spraying pipe 3, one end of the spraying pipe 3 is connected with a gas pipe 5, a gas pressure 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, and a collecting hopper 8 is arranged at the bottom end of the nozzle 7, wherein the specific shape of the nozzle 7 needs to be designed according to different spoke models of the aluminum wheel, and the nozzles in various shapes are all within the protection scope of the invention. Meanwhile, in order to conveniently hold the stone hammer instrument, the invention also selects to arrange a handle 9 on the material spraying pipe 3.
The working process of the handheld stone-beating instrument is as follows: 1. connecting the air pipe to compressed air, and keeping the air pressure valve in a closed state; 2. pouring iron shots into the feeding hole, and uniformly stacking the iron shots on a platform at the lower end of the feeding pipe; 3. holding the stone impact instrument by hand and tightly attaching the nozzle to the surface of the finish turning surface of the spoke; 4. adjusting the air pressure valve to a required pressure value; 5. starting to spray iron shots; 6. recovering iron shots after the injection is finished; 7. closing the pressure valve; 8. the compressed air is turned off. The hand-held stone-beating instrument designed by the invention can not only truly simulate the state that the wheel bears the stone beating in the actual running process, but also has convenient operation.
Because the injection pressure controlled by the air pressure valve 6 of the hand-held stone impact instrument influences the operation speed of the injected material, and the operation speed of the injected material can simulate the state that a wheel bears stone impact 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 through the air conveying pipe 5 is 6-10 bar.
The invention also preferably selects the sprayed material as iron shot particles with the average diameter controlled between 4 mm and 5mm after quenching treatment, wherein the Rockwell hardness of the particles is 61-65, and the total mass is 500g +/-2 g.
After the stone-hit test, the damage level schematic diagram shown in fig. 2 appears on the finish turning surface of the aluminum wheel, wherein the damage degree in fig. 2a is 5%, the damage degree in fig. 2b is 10%, the damage degree in fig. 2c is 15%, and the damage degree in fig. 2d is 20%; in addition, the method preferably simulates the most common road conditions in cities and suburbs, and the damage level corresponding to the vehicle speed of 60-80 km/h is shown in figure 2 b.
In order to smoothly carry out subsequent tests, the method selects to remove residual scrap iron and paint on the finish turning surface of the aluminum wheel after the stone-hit test, and specifically comprises the steps of adhering an adhesive tape to the finish turning surface of the aluminum wheel after the stone-hit test, tearing 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. And then, continuously washing the finish turning surface of the aluminum wheel after the stone impact test by using deionized water, wherein the washing pressure is 80-110 bar, the washing temperature is 20-50 ℃, the washed aluminum wheel is washed until 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. The cleaning method can effectively remove residual aluminum scraps in the stone-hitting pit, and simultaneously, impurity elements such as Ca which influence the subsequent salt spray corrosion test cannot be introduced due to the use of deionized water2+、Cl-、SO4 2-Root plasma.
2) Neutral salt spray test: placing the aluminum wheel treated in the step 1) in a neutral salt fog box to perform an uninterrupted salt fog test for 1000h, and controlling the pH value of a NaCl solution in the neutral salt fog box to be 6.0-7.5 and the temperature to be 33-37 ℃;
after the test is finished, washing and drying;
specifically, each part 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 working parameter require 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 of less than or equal to 20 mu s/cm at the temperature of 20 +/-2 ℃ to prepare anhydrous sodium chloride, wherein the anhydrous sodium chloride contains no more than 0.2% of total impurities, and does not contain copper and nickel, or the content of each element is less than 10 mg/kg, and the pH value of the homogenized NaCl solution is 6.0-7.5.
A spray chamber: first of all, the materials constituting the apparatus and the parts of the apparatus that can come into contact with the saline solution should be inert to said saline solutionAnd (4) the nature is good. At the same time, the minimum volume of the spray chamber is 0.4m3The size of the spray chamber is required to be such that the amount of solution collected in a horizontal area of 10cm diameter is limited to 1-2 mL/h.
A heating device: heating with appropriate heating equipment such as saturation tower to maintain the temperature of the spray chamber at 33-37 deg.C, and checking the temperature of the spray chamber every day and recording.
Spraying equipment: and a compressed air supply system is configured, the injection pressure is 0.8-1.6 bar, the compressed air is filtered before entering the atomizer, and then the compressed air is humidified by an air saturation tower at 44-48 ℃.
A salt mist collector: selecting a measuring cylinder with a specification of 100mL, and matching with a funnel with a diameter of 10cm, wherein the open surface area of the funnel is about 80cm2The two must be made of inert material, the funnel must not be covered above and parallel to the surface of the experimental sample, at least two salt fog collectors are arranged in the spray chamber, and the collection amount is tracked every day.
The neutral salt spray test conditions designed by the invention are strict, the surface corrosion condition of the finish turning surface of the aluminum wheel can be better evaluated, and meanwhile, the test method is adopted for samples with different edge paint film thicknesses, such as 10 micrometers, 20 micrometers, 30 micrometers, 40 micrometers and 50 micrometers, so that the test method finds that: the storage state of the neutral salt spray for 1000h is a critical state of filiform corrosion expansion in the intensified environment, when the neutral salt spray time exceeds 1000h, the filiform corrosion expansion tends to be unstable, and the test data no longer has significant reference value.
And after the neutral salt spray test is completed, taking out the aluminum wheel, continuously washing for 10min by using deionized water with the conductivity of less than or equal to 20 mu s/cm at the washing pressure of 80-110 bar and the temperature of 20-50 ℃, and then airing at normal temperature.
3) First measuring aluminum wheel finish turning surface expanding corrosion width K1: the etch spreading width K is shown in FIG. 31The calculation process is as follows:
measuring the filiform corrosion expanding corrosion width of the edge of the finish turning surface of the aluminum wheel, and selecting the longest expansion line to measure d1The length of the original stone pit is d2Then K is1＝d1-d2。
When K is1If the thickness is more than 1.5mm, the product is directly judged to be 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) in a copper accelerated acetate fog box to perform a 72-hour uninterrupted salt fog test, and controlling the pH value of a NaCl solution in the copper accelerated acetate fog box to be 2.9-3.1 and the temperature to be 48-52 ℃; after the test is finished, washing and drying; standing the mixture 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 apparatus, salt fog collector is equipped with in the copper accelerated acetate fog incasement, their function and working parameter require as follows:
salt solution: preparing anhydrous sodium chloride by using deionized water with the conductivity of less than or equal to 20 mu s/cm at the temperature of 20 +/-2 ℃ in a NaCl solution with the mass percentage concentration of 4.5-5.5%, wherein the total impurities in the anhydrous sodium chloride are not more than 0.4%, and copper and nickel are not required to be contained, or the content of each element is not more than 10 mg/kg. And adding a proper amount of copper chloride dihydrate into the prepared NaCl solution, wherein the concentration of the dissolved copper chloride dihydrate 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.
A spray chamber: the materials of construction of the apparatus and the location of the apparatus that can come into contact with the saline solution should be inert to the solution. And the minimum volume of the spray chamber is 0.2m3Preferably greater than 0.4m3. The spray chamber is sized so that the amount of solution collected in a horizontal area of 10cm diameter is limited to 1mL/h to 2 mL/h.
A heating device: the temperature of the spray chamber was maintained at 50 ℃. + -. 2 ℃ with a suitable heating apparatus, such as a saturation column, and the temperature of the spray chamber was checked daily and recorded.
Spraying equipment: it comprises the following components: a clean air supply system controlled in pressure and humidity; a container containing the atomized solution and one or more atomizers made 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 the temperature of 53-57 ℃ before entering the atomizer.
A salt mist collector: a measuring cylinder of 100mL specification, with a diameter of 10cm and an open surface area of about 80cm2The funnel of (2) both must be made of inert material, must not be covered above the funnel and be parallel to the surface of the experimental sample as much as possible, at least two collectors are placed in the spray chamber and the collection amount is tracked daily.
And after the copper accelerated acetate spray test is finished, taking out the aluminum wheel, adopting deionized water with the conductivity of less than or equal to 20 mu s/cm for 10min, washing at the pressure of 80-110 bar and at the temperature of 20-50 ℃, and then airing at normal temperature.
And placing the dried aluminum wheel in an environmental box for standing for 4 weeks. The environmental chamber should have a minimum volume of 0.5m3The closed chamber keeps the atmospheric environment, the relative humidity is 48-52%, and the temperature is 23-26 ℃. The temperature and humidity of the environmental chamber should be monitored daily. The standing treatment of the step is completed in an environment box, the CASS acid corrosion is only the first step, the corrosion starting point can be generated only in the scratched area due to short time, the corrosion can be further expanded due to the fact that a large amount of corrosion media are still contained in the acid corrosion pit in the standing process, and the corrosion resistance of the finish turning surface paint can be evaluated after the step is completed.
The test condition of the copper accelerated acetate fog designed by the invention is strict, the surface corrosion condition of the finish turning surface of the aluminum wheel can be better evaluated, and meanwhile, the test method is adopted for sample pieces with different edge paint film thicknesses, such as 10 mu m, 20 mu m, 30 mu m, 40 mu m and 50 mu m, so that the following results are found: the storage state of the copper accelerated acetate fog for 72h is a critical state of filiform corrosion expansion under the intensified environment, and after 72h is exceeded, the filiform corrosion expansion tends to be unstable, and the test data no longer has significant reference value.
5) Second measurement of the aluminum wheel finish turning surface expanding corrosion width K2：
Measuring the filiform corrosion expansion width of the edge of the finish turning surface of the aluminum wheel processed in the step 4), and calculating the expansion corrosion width K2To the edge of the finish turning surface of the aluminum wheelEtching width is measured, and the longest extension line is selected to be measured as d3The length of the original stone pit is d2Then K is1＝d3-d2。
When K is2More than 1.5mm, which indicates that the aluminum wheel has unqualified preorder production process and is K2Less than or equal to 1.5mm, which indicates that the preorder production process of the aluminum wheel is qualified.
In order to further verify the effectiveness of the evaluation method, the method also counts the filiform corrosion condition of a large number of aluminum wheel finish turning surfaces fed back after follow-up sale, and when the thickness of a paint film on 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 extended corrosion width K of the aluminum wheel finish turning surface1And K2The thickness of the aluminum wheel is less 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 guidance and suggestion on the production and after sale of the aluminum wheel.
Examples
To further illustrate that the evaluation method designed by the present invention indeed has guiding significance for actual aluminum wheel production, the present example explores the simulation of the stone-strike and salt-fog tests on the finish turning surfaces of aluminum wheels with different edge paint film thicknesses, and the obtained corrosion conditions are shown in table 1;
TABLE 1 Fine turning surface Corrosion of aluminum wheels of different film thicknesses
The embodiment shows that the evaluation method designed by the invention is closely related to the actual production of the aluminum wheel, and the accuracy of the final evaluation result is better.
Claims (10)
1. A method for evaluating filiform corrosion resistance of a finish turning surface of an aluminum wheel is characterized by comprising the following steps: it comprises the following steps:
1) stone impact test: spraying iron shot particles with the total mass of 500g +/-2 g to the finish turning surface of the aluminum wheel by using a stone-beating instrument, wherein a nozzle of the stone-beating instrument is attached to the finish turning surface of the aluminum wheel, and the spraying pressure of the stone-beating instrument is controlled to be 0.95-1.05 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 continuously washing and drying;
2) neutral salt spray test: placing the aluminum wheel treated in the step 1) in a neutral salt fog box to perform an uninterrupted salt fog test for 1000h, and controlling the pH value of a NaCl solution in the neutral salt fog box to be 6.0-7.5 and the temperature to be 33-37 ℃; after the test is finished, washing and drying;
3) first measuring aluminum wheel finish turning surface expanding corrosion width K1: measuring the filiform corrosion expansion width of the edge of the finish turning surface of the aluminum wheel processed in the step 2), and calculating the expansion corrosion width K1When K is1If the thickness is more than 1.5mm, judging that the preorder process of the aluminum wheel is unqualified; when K is1Less than or equal to 1.5mm, and continuing the following steps;
4) copper accelerated acetate spray test: placing the aluminum wheel treated in the step 1) in a copper accelerated acetate fog box for a 72-hour uninterrupted salt fog test, and controlling the pH value of a NaCl solution in the copper accelerated acetate fog box to be 2.9-3.1 and the temperature to be 48-52 ℃;
after the test is finished, washing and drying; standing the mixture 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) second measurement of the aluminum wheel finish turning surface expanding corrosion width K2: measuring the filiform corrosion expansion width of the edge of the finish turning surface of the aluminum wheel processed in the step 4), and calculating the expansion corrosion width K2When K is2If the diameter is more than 1.5mm, judging that the preorder process of the aluminum wheel is unqualified, and when K is greater than2Less than or equal to 1.5mm, which indicates that the preorder production process of the aluminum wheel is qualified.
2. The method for evaluating filiform corrosion resistance of finish surfaces of aluminum wheels according to claim 1, wherein: in the step 1), the iron shot particles are particles with the average diameter controlled within 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 finish surfaces of aluminum wheels according to claim 2, wherein: in step 1), clear away the processing including pasting the sticky tape in the aluminium wheel finish turning face after the stone impact test to with the aluminium wheel finish turning face is 60 the angle and tears the sticky tape off, when the sticky tape is measured according to NF EN 1939 standard, satisfy 600 ~ 750 g/cm.
4. The method for evaluating filiform corrosion resistance of finish surfaces of aluminum wheels according to any one of claims 1 to 3, wherein: in the step 1), the finish turning surface of the aluminum wheel after the stone impact test is washed by deionized water at the washing pressure of 80-110 bar and the temperature of 20-50 ℃ until 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 finish surfaces of aluminum wheels according to claim 1, wherein: in the step 2), the mass percentage concentration of the NaCl solution in the neutral salt spray box is 4.5-5.5%, copper and nickel are not contained, and the total impurities are not more than 0.2%.
6. The method for evaluating filiform corrosion resistance of finish surfaces of aluminum wheels according to claim 5, wherein: in the step 2), deionized water with the conductivity of less than or equal to 20 mu s/cm is adopted for continuously washing for 10min, the washing pressure is 80-110 bar, the temperature is 20-50 ℃, and then the drying is carried out at normal temperature.
7. The method for evaluating filiform corrosion resistance of finish surfaces of aluminum wheels according to claim 1, wherein: in the step 4), the mass percentage concentration of a NaCl solution in the copper-accelerated acetate fog box is 4.5-5.5%, copper and nickel are not contained, total impurities do not exceed 0.4%, and the concentration of copper chloride in the NaCl solution is 0.24-0.28 g/L.
8. The method for evaluating filiform corrosion resistance of finish surfaces of aluminum wheels according to claim 7, wherein: and 4) continuously washing for 10min by using deionized water with the conductivity of less than or equal to 20 mu s/cm at the washing pressure of 80-110 bar and the temperature of 20-50 ℃, and then drying at normal temperature.
9. The method for evaluating filiform corrosion resistance of finish surfaces of aluminum wheels according to claim 1, wherein: in step 3), the expanding etching width K1The calculation process of (2) is as follows:
measuring the filiform corrosion expanding corrosion width of the edge of the finish turning surface of the aluminum wheel, and selecting the longest expansion line to measure d1The length of the original stone pit is d2Then K is1＝(d1-d2)；
In step 5), the expanding etching width K2The calculation process of (2) is as follows:
measuring the filiform corrosion expanding corrosion width of the edge of the finish turning surface of the aluminum wheel, and selecting the longest expansion line to measure d3The length of the original stone pit is d2Then K is2＝(d3-d2)。
10. The method for evaluating filiform corrosion resistance of finish surfaces of aluminum wheels according to claim 1, wherein: the stone impact instrument comprises a feed inlet, an inlet pipe and a material spraying pipe communicated with the inlet pipe, a vibrating table is further arranged at the joint of the inlet pipe and the material spraying pipe, one end of the material spraying pipe is connected with a gas pipe, a gas pressure valve is further arranged at the joint of the material spraying pipe and the gas pipe, the other end of the material spraying pipe is connected with a nozzle, and a material collecting hopper is arranged at the bottom end of the nozzle.
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| CN113514386A (en) * | 2021-03-16 | 2021-10-19 | 首钢集团有限公司 | Method for measuring under-film expanding corrosion width of automobile sheet coating sample |
| CN113624672A (en) * | 2021-08-16 | 2021-11-09 | 格力电器（合肥）有限公司 | High-acceleration combined type salt spray test method applied to dial switch contact |
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| 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 |
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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 |
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| CN113514386A (en) * | 2021-03-16 | 2021-10-19 | 首钢集团有限公司 | Method for measuring under-film expanding corrosion width of automobile sheet coating sample |
| CN113624672A (en) * | 2021-08-16 | 2021-11-09 | 格力电器（合肥）有限公司 | High-acceleration combined type salt spray test method applied to dial switch contact |
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