Method, system, process, computer equipment and storage medium for evaluating the corrosion resistance of automobile parts in natural environments

Abstract

The present invention relates to a method, system, process, computer equipment, and storage medium for evaluating the corrosion resistance of automotive parts in natural environments. These methods, systems, processes, computer equipment, and storage media pertain to the technical field of automotive part performance evaluation, and address the issues of low efficiency and accuracy in evaluating the corrosion resistance of automotive parts in natural environments. The method comprises: obtaining mechanical performance test data from a salt spray test; obtaining mechanical performance test data from a natural simulation test; the mechanical performance test data including the current test cycle and the mechanical performance test results corresponding to the current test cycle; obtaining a mechanical performance relationship diagram between salt spray test time and natural environment corrosion resistance years based on the obtained mechanical performance test data from the salt spray test and the obtained mechanical performance test data from the natural simulation test; collecting mechanical test results of the automotive part to be evaluated, and obtaining an evaluation result of the natural environment corrosion resistance of the automotive part based on the mechanical test results and the mechanical performance relationship diagram. The present invention is suitable for evaluating the corrosion resistance of automotive parts in natural environments.

Description

Technical Field

[0001] The present application relates to the technical field of automobile parts performance evaluation, and in particular to the evaluation of the corrosion resistance of automobile parts in natural environments. Background Art

[0002] The future development trend of automobiles is safety and energy conservation. Therefore, more new materials will replace existing materials in the future. However, when promoting and applying new materials, in addition to considering whether the mechanics must meet the use requirements, it is also necessary to consider whether the corrosion resistance and aging resistance of the materials can meet the use requirements, and whether the performance of the parts materials can meet the requirements after a certain number of years. Therefore, it is necessary to conduct corrosion resistance tests on the parts materials in natural environments. However, the corrosion resistance test cycle in natural environments is too long, which seriously affects the progress of research and development. Research and development cannot wait, so there is an urgent need for a method to quickly evaluate the corrosion resistance of materials in natural environments.

[0003] A salt spray test is an environmental test that primarily uses salt spray equipment to simulate a salt spray environment to assess the corrosion resistance of products or materials. The test results are determined after a certain period of time under specified test conditions, including temperature and humidity, sodium chloride solution concentration, and pH value. Methods for determining the test results include rating, weighing, the presence of corrosive substances, and statistical analysis of corrosion data.

[0004] 1. Rating determination method

[0005] The percentage of the ratio of corrosion area to total area is divided into several levels according to a certain method, and a certain level is used as the basis for qualification judgment, which is suitable for the evaluation of flat plate samples.

[0006] 2. Weighing method

[0007] The corrosion resistance of the sample is judged by calculating the weight loss (or weight gain) of the sample before and after the corrosion test. It is suitable for assessing the corrosion resistance of a certain metal.

[0008] 3. Determination of the presence of corrosion products

[0009] It is a qualitative judgment method, which judges the sample based on whether the product produces corrosion after the salt spray corrosion test. This method is mostly used in general product standards.

[0010] 4. Statistical analysis of corrosion data

[0011] These evaluation methods only reflect the corrosion of the sample surface, but not the impact of corrosion on the sample's mechanical properties. For example, sample A exhibits uniform surface corrosion, while sample B exhibits localized pitting corrosion. While sample A appears to have severe corrosion and significant weight loss, the uniform corrosion has a minimal impact on performance. While sample B exhibits only localized pitting, the pitting creates stress concentration that can lead to material fracture, significantly impacting performance. Therefore, this salt spray corrosion test method cannot reflect the impact of corrosion on the performance of the test sample material, nor can it evaluate whether the sample material meets the intended use requirements.

[0012] Currently, only the degree of corrosion on the surface of parts after salt spray time is measured, but the impact of corrosion on the performance of parts cannot be evaluated. Therefore, there is an urgent need for an evaluation method that can quickly and accurately evaluate the corrosion resistance of materials in natural environments. Summary of the Invention

[0013] The purpose of the present invention is to solve the problems of low efficiency and low accuracy of existing methods for evaluating the corrosion resistance of automobile parts in natural environments, and to provide a method, system, process, computer equipment and storage medium for evaluating the corrosion resistance of automobile parts in natural environments.

[0014] The present invention is achieved through the following technical solutions. In one aspect, the present invention provides a method for evaluating the corrosion resistance of automobile parts in natural environments, the method comprising:

[0015] Step 1: Obtain mechanical properties test data of salt spray test;

[0016] Obtain mechanical properties test data from natural simulation tests;

[0017] The mechanical properties test data includes the current test cycle and the mechanical properties test results corresponding to the current test cycle;

[0018] Step 2: Obtain a mechanical property relationship diagram between salt spray test time and natural environment corrosion resistance years based on the mechanical property test data of the salt spray test and the mechanical property test data of the natural simulation test obtained in step 1;

[0019] Step 3: Collect mechanical test results of the automobile part to be evaluated, and obtain evaluation results of the natural environment corrosion resistance of the automobile part based on the mechanical test results and the mechanical property relationship diagram.

[0020] Furthermore, the salt spray test specifically includes:

[0021] In the set simulated salt spray test chamber, use a thin wire to hang the test sample into the salt spray test chamber, and spray the salt spray evenly onto the test sample;

[0022] The test is timed and the test samples are removed and processed according to the test cycle.

[0023] Furthermore, the natural simulation test includes one or both of a natural exposure test and a shed test.

[0024] Furthermore, the natural exposure test specifically includes:

[0025] Place the test samples facing due south and at a 45-degree angle to the ground. The test samples should not interfere with each other. Remove and process the test samples according to the test cycle.

[0026] The under-shed test specifically includes:

[0027] Place the test samples in a light-proof, rain-proof and ventilated test box. The test samples will not interfere with each other. Take out and process the test samples according to the test cycle.

[0028] Furthermore, the mechanical properties relationship diagram consists of two parts: salt spray test and natural simulation test;

[0029] In the salt spray test section, draw a graph of salt spray test time and mechanical properties;

[0030] In the natural simulation test part, a curve of natural simulation test time and mechanical properties is drawn.

[0031] Furthermore, the mechanical property tests include but are not limited to strength, elongation, impact performance, and cross-sectional shrinkage tests.

[0032] In a second aspect, the present invention provides a system for evaluating the corrosion resistance of automobile parts in natural environments, the system comprising:

[0033] Data acquisition module, used to obtain mechanical properties test data of salt spray test;

[0034] Obtain mechanical properties test data from natural simulation tests;

[0035] The mechanical properties test data includes the current test cycle and the mechanical properties test results corresponding to the current test cycle;

[0036] a relationship diagram acquisition module, configured to acquire a mechanical property relationship diagram between salt spray test time and corrosion resistance years in natural environment based on the mechanical property test data of the salt spray test and the mechanical property test data of the natural simulation test obtained by the data acquisition module;

[0037] The evaluation result acquisition module is used to collect mechanical test results of the automobile parts to be evaluated, and obtain the evaluation results of the corrosion resistance of the automobile parts in the natural environment based on the mechanical test results and the mechanical performance relationship diagram.

[0038] In a third aspect, the present invention provides a process for evaluating the corrosion resistance of automobile parts in natural environments, the process comprising:

[0039] Step 1: Prepare the test sample according to the manufacturing process of the automobile parts;

[0040] Step 2, carrying out salt spray test and natural simulation test respectively on the test sample, and setting the test cycle of salt spray test and the test cycle of natural simulation test;

[0041] The test period of the salt spray test is in hours, and the test period of the natural simulation test is in years or months;

[0042] Step 3: performing a mechanical property test on the test sample of the salt spray test according to the test cycle of the salt spray test, and inputting the mechanical property test data of the salt spray test into the above-mentioned automobile parts natural environment corrosion resistance evaluation system;

[0043] According to the test cycle of the natural simulation test, a mechanical property test is performed on the test sample of the natural simulation test, and the mechanical property test data of the natural simulation test is input into the above-mentioned automobile parts natural environment corrosion resistance evaluation system;

[0044] The above-mentioned automobile parts natural environment corrosion resistance performance evaluation system is used to obtain the evaluation results of the automobile parts natural environment corrosion resistance performance.

[0045] In a fourth aspect, the present invention provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor runs the computer program stored in the memory, the steps of a method for evaluating the natural environment corrosion resistance of automobile parts as described above are executed.

[0046] In a fifth aspect, the present invention provides a computer-readable storage medium, in which a plurality of computer instructions are stored. The plurality of computer instructions are used to enable a computer to execute a method for evaluating the natural environment corrosion resistance of automobile parts as described above.

[0047] Beneficial effects of the present invention:

[0048] The main purpose of the present invention is to establish a mechanical property relationship diagram between the salt spray test time and the corrosion resistance years in the natural environment of different materials. According to the relationship diagram, it is easy to understand the influence of the salt spray test on the performance of a certain part material, and the mechanical properties of the part material after several years can be predicted. This solves the current problem that the application of new materials requires corrosion resistance testing in the natural environment, but the corrosion resistance test cycle in the natural environment is too long and research and development cannot wait.

[0049] Compared with the existing technology, the present invention has the following advantages:

[0050] 1. The mechanical properties relationship diagram of the method of the present invention can test the influence of corrosion on the mechanical properties of the component material and predict the mechanical properties of the component material after several years;

[0051] 2. For similar materials, the mechanical properties relationship diagram only requires one grade of material to be tested for corrosion resistance under natural conditions. The mechanical properties of other grades of the same material after several years can be found out through the mechanical properties relationship diagram and salt spray test results of the material. Compared with conducting corrosion resistance tests under natural conditions for each material grade, it saves a lot of time, manpower and financial resources.

[0052] 3. The present invention uses mechanical properties to obtain a mechanical property relationship diagram between salt spray test time and corrosion resistance years in natural environment, which can improve the accuracy of evaluating the corrosion resistance of materials in natural environment, thereby improving the reliability of component materials.

[0053] The present invention is applicable to the evaluation of corrosion resistance of automobile parts in natural environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0055] Figure 1 This is the relationship diagram between the salt spray test time and the corrosion resistance years in the natural environment;

[0056] Figure 2 This is a data processing diagram for the relationship between the mechanical properties of the salt spray test time and the corrosion resistance years in the natural environment. DETAILED DESCRIPTION

[0057] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention.

[0058] Embodiment 1: A method for evaluating the corrosion resistance of automobile parts in natural environments, the method comprising:

[0059] Step 1: Obtain mechanical properties test data of salt spray test;

[0060] Obtain mechanical properties test data from natural simulation tests;

[0061] The mechanical properties test data includes the current test cycle and the mechanical properties test results corresponding to the current test cycle;

[0062] Step 2: Obtain a mechanical property relationship diagram between salt spray test time and natural environment corrosion resistance years based on the mechanical property test data of the salt spray test and the mechanical property test data of the natural simulation test obtained in step 1;

[0063] Step 3: Collect mechanical test results of the automobile part to be evaluated, and obtain evaluation results of the natural environment corrosion resistance of the automobile part based on the mechanical test results and the mechanical property relationship diagram.

[0064] In this embodiment:

[0065] First, the mechanical properties relationship diagram between the salt spray test time and the natural environment corrosion resistance years in this embodiment can test the impact of corrosion on the mechanical properties of part materials, and can predict the mechanical properties of the part materials after several years, thereby improving the reliability of automobile material performance.

[0066] Secondly, the mechanical properties relationship diagram between the salt spray test time and the corrosion resistance years in the natural environment in this embodiment means that for the same type of materials, only one brand of material needs to be subjected to the corrosion resistance test in the natural environment. The corrosion resistance test results of other brands of the same type of materials can be found out in the natural environment through the mechanical properties relationship diagram between the salt spray test time and the corrosion resistance years in the natural environment of the material and the salt spray test results. Compared with conducting corrosion resistance tests in the natural environment for each brand of material, a lot of time is saved, and manpower and financial resources are also saved.

[0067] Finally, this embodiment uses mechanical properties to obtain a mechanical property relationship diagram between salt spray test time and corrosion resistance years in natural environment, which can improve the accuracy of evaluating the corrosion resistance of materials in natural environments, thereby improving the reliability of component materials.

[0068] Embodiment 2: This embodiment further defines the method for evaluating the corrosion resistance of automobile parts in natural environments described in Embodiment 1. In this embodiment, the salt spray test is further defined, specifically including:

[0069] In the set simulated salt spray test chamber, use a thin wire to hang the test sample into the salt spray test chamber, and spray the salt spray evenly onto the test sample;

[0070] The test is timed and the test samples are removed and processed according to the test cycle.

[0071] The salt spray test in this embodiment can effectively reflect the corrosion resistance data of the test sample, and this data can provide accurate, effective and short-test-time data support for the evaluation of the corrosion resistance of automobile parts in natural environments.

[0072] Embodiment 3: This embodiment further limits the method for evaluating the corrosion resistance of automobile parts in a natural environment described in Embodiment 1. In this embodiment, the natural simulation test is further limited, specifically including:

[0073] The natural simulation test includes one or both of a natural exposure test and a shed test.

[0074] In this embodiment, the natural exposure test and the shed test are simulation tests selected according to the working environment of the parts.

[0075] Embodiment 4: This embodiment further defines the method for evaluating the corrosion resistance of automobile parts in a natural environment described in Embodiment 3. In this embodiment, the natural exposure test and the shed test are further defined, specifically including:

[0076] The natural exposure test specifically includes:

[0077] Place the test samples facing due south and at a 45-degree angle to the ground. The test samples should not interfere with each other. Remove and process the test samples according to the test cycle.

[0078] The under-shed test specifically includes:

[0079] Place the test samples in a light-proof, rain-proof and ventilated test box. The test samples will not interfere with each other. Take out and process the test samples according to the test cycle.

[0080] The natural exposure test and the shed test in this embodiment can effectively reflect the corrosion resistance data of the test samples, which can provide accurate, effective and short-test-time data support for the evaluation of the corrosion resistance of automobile parts in natural environments.

[0081] Embodiment 5: This embodiment further defines the method for evaluating the corrosion resistance of automobile parts in natural environments described in Embodiment 1. In this embodiment, the mechanical properties relationship diagram is further defined, specifically including:

[0082] The mechanical properties relationship diagram consists of two parts: salt spray test and natural simulation test;

[0083] In the salt spray test section, draw a graph of salt spray test time and mechanical properties;

[0084] In the natural simulation test part, a curve of natural simulation test time and mechanical properties is drawn.

[0085] It should be noted that, in this embodiment, the natural simulation test time and mechanical property curve includes one or both of the natural exposure test corrosion resistance year (month) limit and mechanical property curve and the shed test corrosion resistance year (month) limit and mechanical property curve.

[0086] The corrosion resistance limits of natural exposure test and shed test are simulation tests selected according to the working environment of parts. When making actual drawings, one of them can be selected according to the actual situation.

[0087] For example, a mechanical properties relationship diagram between salt spray test time and corrosion resistance in natural environments consists of an abscissa, two ordinates, and several curves. The abscissa (X) is divided into two parts: one represents the salt spray test time in hours, and the other represents the corrosion resistance in natural environments in months. The two ordinates (Y1 and Y2) represent strength and elongation, respectively. This relationship diagram consists of two parts: the salt spray test and the corrosion resistance test in natural environments.

[0088] It should be noted that the mechanical property coordinates (i.e., the vertical axis) are not limited to strength and elongation, but also include other properties such as impact resistance and cross-sectional shrinkage.

[0089] Embodiment 6: This embodiment further limits the method for evaluating the corrosion resistance of automobile parts in natural environments described in Embodiment 1. In this embodiment, the mechanical properties test is further limited, specifically including:

[0090] The mechanical property tests include but are not limited to strength, elongation, impact performance, and section shrinkage tests.

[0091] The mechanical property parameters obtained from the mechanical property test given in this embodiment can effectively and accurately evaluate the corrosion resistance of automobile parts in natural environments and are applicable to the method of this embodiment.

[0092] Embodiment 7: This embodiment is a system for evaluating the natural environment corrosion resistance of automobile parts according to the method for evaluating the natural environment corrosion resistance of automobile parts described in embodiment 1, specifically comprising:

[0093] The system comprises:

[0094] Data acquisition module, used to obtain mechanical properties test data of salt spray test;

[0095] Obtain mechanical properties test data from natural simulation tests;

[0096] The mechanical properties test data includes the current moment and the mechanical properties test results corresponding to the current moment;

[0097] a relationship diagram acquisition module, configured to acquire a mechanical property relationship diagram between salt spray test time and corrosion resistance years in natural environment based on the mechanical property test data of the salt spray test and the mechanical property test data of the natural simulation test obtained by the data acquisition module;

[0098] The evaluation result acquisition module is used to obtain the evaluation result of the corrosion resistance of automobile parts in natural environment according to the mechanical property relationship diagram.

[0099] The system of this embodiment can effectively implement and execute the method for evaluating the natural environment corrosion resistance of automobile parts described in embodiment one, thereby contributing to improving the accuracy and evaluation efficiency of the method for evaluating the natural environment corrosion resistance of automobile parts described in embodiment one.

[0100] Embodiment 8: This embodiment is based on a natural environment corrosion resistance evaluation method for automobile parts of the present invention, and includes:

[0101] Step 1: Prepare the test sample according to the manufacturing process of the automobile parts;

[0102] It should be noted that the test samples can be divided into several groups according to the salt spray test and the natural simulation test, and each group contains several test samples.

[0103] Step 2, carrying out salt spray test and natural simulation test respectively on the test sample, and setting the test cycle of salt spray test and the test cycle of natural simulation test;

[0104] The test period of the salt spray test is in hours, and the test period of the natural simulation test is in years or months;

[0105] Step 3: performing a mechanical property test on the test sample of the salt spray test according to the test cycle of the salt spray test, and inputting the mechanical property test data of the salt spray test into the above-mentioned automobile parts natural environment corrosion resistance evaluation system;

[0106] According to the test cycle of the natural simulation test, a mechanical property test is performed on the test sample of the natural simulation test, and the mechanical property test data of the natural simulation test is input into the above-mentioned automobile parts natural environment corrosion resistance evaluation system;

[0107] The above-mentioned automobile parts natural environment corrosion resistance performance evaluation system is used to obtain the evaluation results of the automobile parts natural environment corrosion resistance performance.

[0108] It should be noted that the method for obtaining mechanical properties test data specifically includes: randomly selecting a number of test samples from the test samples of the salt spray test and the natural simulation test, and obtaining the corresponding mechanical properties test results. For different tests, the average of the obtained mechanical properties test results is taken as the final mechanical properties test result to be recorded.

[0109] It should be noted that, in this embodiment, the test cycle of the salt spray test can be set to hours, and the test cycle of the natural simulation test can be set to months or years, thereby realizing the prediction of the evaluation results of the corrosion resistance of automobile parts in a long-term natural environment by using short-term salt spray test data.

[0110] In this embodiment, the test sample and the automobile parts are made with exactly the same process. If the parts have been surface treated, the test sample should also be surface treated with the same process, thereby improving the accuracy of the test data and further improving the reliability and accuracy of the evaluation of the corrosion resistance of automobile parts in natural environments.

[0111] It should be noted that, in this embodiment, a small hole can be drilled at one end of the sample close to the end face, and the sample can be hung with a thin wire. A small hole can be drilled at one end of the sample close to the end face, and the small hole can allow the thin wire to pass through, ensuring that the salt mist can be evenly sprayed on each sample.

[0112] Implementation 9: This implementation is an example of the present invention, specifically including:

[0113] Example 1: Mechanical properties relationship diagram of typical material A between salt spray test time and corrosion resistance in natural environment

[0114] 1) Step 1: Prepare test samples

[0115] According to the manufacturing process of material A, several standard mechanical property specimens are prepared, and a small hole is drilled near the end face at one end of the specimen. Note that the small hole should not affect the mechanical property test; and the specimens are divided into Group A and Group B.

[0116] 2) Step 2, test

[0117] A salt spray test was conducted on group A. According to the test requirements, the samples in group A were divided into N groups, namely N1, N2, N3...Nn groups, with 3 samples in each group. After being subjected to salt spray corrosion for t1, t2, t3...tn times, the samples were taken out, cleaned, blown dry, and recorded.

[0118] The natural exposure test was conducted on Group B. As above, the samples in Group B were divided into groups N1, N2, N3...Nn, with 3 samples in each group. The natural exposure tests were conducted for cycles of t1, t2, t3...tn respectively. After the test was completed, the samples were taken out, cleaned, blown dry, sealed and stored, and records were made.

[0119] 3) Step 3, test results

[0120] Conduct mechanical property tests on samples in groups N1, N2, N3…Nn after the salt spray test and natural exposure test. If the test results are valid, take the average value of the test results in each time period and record the test results.

[0121] 4) Step 4: Preparation of the relationship diagram between salt spray test time and corrosion resistance in natural environment

[0122] Based on the test results in 3), a graph of the salt spray test time versus mechanical properties was drawn in the salt spray test area, and a graph of the natural exposure test corrosion resistance years (months) versus mechanical properties was drawn in the natural environment corrosion resistance test area. After all curves were drawn, a graph of the mechanical properties relationship between the salt spray test time and the natural environment corrosion resistance years was completed.

[0123] Implementation 10: This implementation is the second embodiment of the present invention, and specifically includes:

[0124] Example 2: A part is required to have a service life of 3 years in a coastal exposed environment, a strength greater than 180 MPa, and an elongation greater than 3%. Figure 2 As shown in the figure, based on a service life of 3 years, the conversion months are 36 months. Therefore, the intersection of the vertical line on the X-axis at 36 months and the natural exposure test corrosion resistance and strength performance curve corresponds to a strength of 200MPa, and the intersection with the natural exposure test corrosion resistance and elongation curve corresponds to an elongation of 4%. Therefore, material A meets the design requirements and can be selected.

[0125] Furthermore, the mechanical properties relationship diagram between material A's salt spray test duration and years of corrosion resistance in natural environments shows that 232 hours of salt spray testing for material A is equivalent to three years of corrosion resistance in natural environments. For material B, which is similar to material A, if its strength is greater than 180 MPa after 232 hours of salt spray testing, it indicates that material B meets the requirements for use and does not require a three-year coastal exposure test, saving time, manpower, and material resources.

[0126] Implementation 11: This implementation is the third implementation of this embodiment, specifically including:

[0127] The primary purpose of this example is to establish a correlation between salt spray test time, corrosion resistance in natural environments, and mechanical properties of components made of different materials. This approach addresses the issue of corrosion lifespan in natural environments and the impact of the natural environment on component material properties. To achieve this, this example provides a mechanical property relationship diagram between salt spray test time and corrosion resistance in natural environments, as well as a method for plotting it.

[0128] To achieve the above objectives, this embodiment adopts the following technical solutions:

[0129] The corrosion resistance test method of the parts material of this embodiment is carried out according to the following steps:

[0130] 1) Step 1: Prepare test samples

[0131] Based on the manufacturing process of automotive parts, prepare several standard mechanical properties specimens (ensure that the mechanical properties specimens and the part manufacturing process are identical). Drill a small hole near the end face of one end of the specimen. Note that the small hole should not affect the mechanical properties test. The specimens are grouped according to the test items to be performed. In this example, they are divided into three groups: Group A, Group B, and Group C. The number of test groups can also be increased according to the test items.

[0132] 2) Step 2, test

[0133] For Group A, perform a salt spray test. Inside a pre-set simulated salt spray test chamber, use thin wires to mount the specimens inside, ensuring that the salt spray is evenly applied to each specimen. Once the specimens are mounted, begin the salt spray corrosion test and start timing. After varying corrosion test times according to the protocol, remove the specimens, clean them, air dry them, seal them, and record the results.

[0134] The natural exposure test was conducted on Group B at the Hainan test site. The effective surface of the specimens faced due south and the angle between the specimens and the ground was 45 degrees. The specimens did not interfere with each other. The test cycle was based on months. Tests of different cycles were formulated as needed. After the test was completed, the specimens were taken out, cleaned, blown dry, sealed and stored, and records were made.

[0135] The C group test was conducted under the shed test at the Hainan test site. The samples were placed in a light-shielding, rain-proof and ventilated test box. The samples did not interfere with each other. The test cycle was based on months, and tests of different cycles were formulated according to needs. After the test was completed, the samples were taken out, cleaned, blown dry, sealed and stored, and records were made.

[0136] 3) Step 3, test results

[0137] Conduct mechanical property tests on group A samples after the salt spray test, and record the mechanical property test results at different salt spray test times;

[0138] Conduct mechanical property tests on group B samples after the natural exposure test, and record the mechanical property test results under different natural exposure test corrosion resistance years (months);

[0139] Conduct mechanical property tests on the C group samples after the shed test, and record the mechanical property test results under different shed test corrosion resistance years (months);

[0140] 4) Step 4: Preparation of the relationship diagram between salt spray test time and corrosion resistance in natural environment

[0141] The mechanical properties relationship diagram between the salt spray test time and the corrosion resistance years in natural environment consists of a horizontal axis, two vertical axes and several curves. Figure 1 , where the horizontal axis (X) is divided into two parts, one part represents the salt spray test time in hours, and the other part represents the corrosion resistance limit in years (months) under natural conditions in months. The two vertical axes (Y1, Y2) represent strength and elongation respectively. The relationship diagram consists of two parts: salt spray test and corrosion resistance test under natural conditions. According to the salt spray test time and mechanical property test results, a salt spray test time and mechanical property curve is drawn in the salt spray test area, and according to the natural exposure test corrosion resistance limit and mechanical property test results, a natural exposure test corrosion resistance limit and mechanical property curve is drawn in the corrosion resistance test area under natural conditions, or a shed test corrosion resistance limit and mechanical property curve is drawn. After all the curves are drawn, the mechanical property relationship diagram between the salt spray test time and the natural environment corrosion resistance limit is completed. This chart is easy to use. For example, if you want to find out the safe service life of a certain strength of the material under natural exposure environment, you only need to find the strength on the vertical axis, draw a line parallel to the X-axis through the strength, and the natural exposure test corrosion resistance year (month) limit corresponding to the intersection of the natural exposure test corrosion resistance year (month) limit and the mechanical property curve is the safe service life of the material at this strength.

[0142] It should be noted that:

[0143] The mechanical properties test specimen in step 1 is exactly the same as the part process. If the part has been surface treated, the mechanical properties test specimen should also be surface treated with the same process.

[0144] The thin wire in step 2 is a wire made of a non-conductive organic material. The samples of different materials are hung in the salt spray test chamber using the non-conductive thin wire.

[0145] The corrosion resistance limits of the natural exposure test and the corrosion resistance limits of the shed test in step 4 are simulation tests selected based on the working environment of the parts. During actual drawing, one of them can be selected based on actual conditions.

[0146] Mechanical properties tests are carried out on samples after salt spray test and natural environment corrosion resistance years, and salt spray corrosion time and mechanical properties curves, and natural simulation test time and mechanical properties curves can be drawn respectively.

[0147] The mechanical property coordinates in the mechanical property relationship diagram of the material salt spray test time and the natural environment corrosion resistance years formulated in step 4 are not limited to strength and elongation, but also include other properties such as impact resistance and cross-sectional shrinkage.

[0148] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0149] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0150] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0151] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for evaluating the corrosion resistance of automobile parts in natural environments, characterized in that: The method comprises: Step 1: Prepare test samples. According to the manufacturing process of the test sample materials, prepare a number of standard mechanical property specimens and divide the specimens into two groups. One group of specimens is subjected to salt spray test, and the other group of specimens is subjected to natural simulation test. The specimens in the salt spray test were divided into multiple groups, and each group was subjected to salt spray corrosion for different periods of time. The specimens in the natural simulation test were divided into multiple groups, and each group was subjected to natural simulation for different periods of time. Conducting mechanical property tests on the samples after the salt spray test and the natural simulation test respectively to obtain mechanical property test data of the salt spray test and mechanical property test data of the natural simulation test; Step 2: Obtain a mechanical property relationship diagram between salt spray test time and natural environment corrosion resistance years based on the mechanical property test data of the salt spray test and the mechanical property test data of the natural simulation test obtained in step 1; Step 3: Collect mechanical test results of the automobile part to be evaluated, and obtain evaluation results of the natural environment corrosion resistance of the automobile part based on the mechanical test results and the mechanical property relationship diagram.

2. The method for evaluating the corrosion resistance of automobile parts in natural environments according to claim 1, characterized in that: The salt spray test specifically includes: In the set simulated salt spray test chamber, use a thin wire to hang the test sample into the salt spray test chamber, and spray the salt spray evenly onto the test sample; The test is timed and the test samples are removed and processed according to the test cycle.

3. The method for evaluating the corrosion resistance of automobile parts in natural environments according to claim 1, characterized in that: The natural simulation test includes one or both of a natural exposure test and a shed test.

4. The method for evaluating the corrosion resistance of automobile parts in natural environments according to claim 3, characterized in that: The natural exposure test specifically includes: Place the test samples facing due south and at a 45-degree angle to the ground. The test samples should not interfere with each other. Remove and process the test samples according to the test cycle. The under-shed test specifically includes: Place the test samples in a light-proof, rain-proof and ventilated test box. The test samples will not interfere with each other. Take out and process the test samples according to the test cycle.

5. The method for evaluating the corrosion resistance of automobile parts in natural environments according to claim 1, characterized in that: The mechanical properties relationship diagram consists of two parts: salt spray test and natural simulation test; In the salt spray test section, draw a graph of salt spray test time and mechanical properties; In the natural simulation test part, a curve of natural simulation test time and mechanical properties is drawn.

6. The method for evaluating the corrosion resistance of automobile parts in natural environments according to claim 1, characterized in that: The mechanical property tests include but are not limited to strength, elongation, impact performance, and section shrinkage tests.

7. A natural environment corrosion resistance evaluation system for automobile parts, characterized in that: The system comprises: Prepare test samples. According to the manufacturing process of the test sample materials, make a number of standard mechanical property specimens and divide the specimens into two groups. One group of specimens is subjected to salt spray test, and the other group of specimens is subjected to natural simulation test. The specimens in the salt spray test were divided into multiple groups, and each group was subjected to salt spray corrosion for different periods of time. The specimens in the natural simulation test were divided into multiple groups, and each group was subjected to natural simulation for different periods of time. The mechanical properties test is carried out on the samples after the salt spray test and the natural simulation test respectively. The data acquisition module is used to obtain the mechanical properties test data of the salt spray test and the mechanical properties test data of the natural simulation test. The mechanical properties test data includes the current test cycle and the mechanical properties test results corresponding to the current test cycle; a relationship diagram acquisition module, configured to acquire a mechanical property relationship diagram between salt spray test time and corrosion resistance years in natural environment based on the mechanical property test data of the salt spray test and the mechanical property test data of the natural simulation test obtained by the data acquisition module; The evaluation result acquisition module is used to collect the mechanical test results of the automobile parts to be evaluated, and obtain the evaluation results of the corrosion resistance of the automobile parts in the natural environment based on the mechanical test results and the mechanical performance relationship diagram.

8. A computer device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the processor runs the computer program stored in the memory, the steps of the method according to any one of claims 1 to 6 are performed.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a plurality of computer instructions, and the plurality of computer instructions are used to enable a computer to execute the method according to any one of claims 1 to 6.

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