CN121521726A - Rapid and accurate quantitative evaluation method for corrosion performance of steel electrophoretic plate for vehicle body - Google Patents
Rapid and accurate quantitative evaluation method for corrosion performance of steel electrophoretic plate for vehicle bodyInfo
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- CN121521726A CN121521726A CN202511751447.7A CN202511751447A CN121521726A CN 121521726 A CN121521726 A CN 121521726A CN 202511751447 A CN202511751447 A CN 202511751447A CN 121521726 A CN121521726 A CN 121521726A
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Abstract
The invention relates to a rapid and accurate quantitative evaluation method for corrosion performance of a steel electrophoresis plate for a vehicle body, which comprises the steps of preparing and preprocessing a standardized sample, combining with cooperative control of specific chemical components, surface morphology and coating process parameters, then carrying out a short-period accelerated corrosion test, and accurately predicting 1000h long-term corrosion behavior by using an original prediction formula model based on performance detection data. The invention solves the industrial problems of long period, high cost and low efficiency of the traditional evaluation method, shortens the evaluation period of 42 days to 10 days, and improves the efficiency by more than 76%. The method can rapidly and accurately screen out the plate with the best suitability with the target coating system, is directly used for final authentication and sample delivery, provides scientific basis for optimizing the material selection of the vehicle body electrophoresis plate and improving the coating process, and has remarkable engineering application value.
Description
Technical Field
The patent application belongs to the technical field of corrosion protection of metal materials, and particularly relates to a rapid evaluation method for corrosion performance of a steel electrophoretic plate for a vehicle body based on an accelerated corrosion test and mathematical modeling, which is particularly suitable for quantitative evaluation of corrosion performance of a cold-rolled steel plate coating system in the field of automobile manufacturing.
Background
The steel electrophoresis board for the automobile body is used as an important material in the automobile manufacture, and the corrosion performance of the steel electrophoresis board is directly related to the service life, the safety and the appearance quality of the automobile. With the rapid development of the automobile industry and the increasing competition in the market, the steel electrophoretic board for the automobile body has higher requirements on the corrosion performance. The traditional corrosion performance evaluation method often has the problems of long evaluation period, complex operation, strong subjectivity of results and the like, and is difficult to meet the requirements of modern automobile manufacturing on quick and accurate evaluation.
Currently, the evaluation of corrosion performance of steel electrophoretic sheets for vehicle bodies in the market mainly depends on long-time corrosion tests under laboratory conditions, such as neutral salt spray tests (generally 1000h or more for cold-rolled sheets, hot-formed steels, etc.), cyclic salt spray tests (generally 552h or more for cold-rolled sheets, galvanized sheets, hot-formed steels, etc.), and the like. Although the traditional methods can truly simulate the corrosion environment of the steel electrophoresis board for the vehicle body in the actual use process, the traditional methods have the defects of long test period, high cost and the like.
These conventional methods have the fatal disadvantages of extremely long test period (especially neutral salt fog, usually more than 42 days), high manpower and material cost, great influence of human factors on results and poor consistency. This results in the material certification link becoming a bottleneck limiting development progress when new materials are developed, new car certification, or suppliers are switched. Engineers cannot quickly screen out the board with the best performance and the best suitability with a coating system from various candidate boards, and can only passively wait for a long test result, thereby seriously slowing down the overall research and development rhythm.
Therefore, the creative development of the method for rapidly and accurately quantitatively evaluating the corrosion performance of the steel electrophoretic plate for the vehicle body can be directly used for guiding authentication, sample feeding and material selection, and has important significance for improving the manufacturing efficiency of the automobile plate, reducing the production cost and ensuring the quality of automobile products.
Disclosure of Invention
The invention aims to provide a rapid and accurate quantitative evaluation method for corrosion performance of a steel electrophoresis board for a vehicle body, and aims to establish a quantitative relation model between the corrosion performance and corrosion conditions through statistical analysis of corrosion test data so as to realize rapid, objective and accurate evaluation of the corrosion performance of the steel electrophoresis board for the vehicle body.
In order to solve the problems, the invention adopts the following technical scheme:
A rapid and accurate quantitative evaluation method for corrosion performance of a steel electrophoresis board for a vehicle body comprises the following steps:
a. The preparation method comprises the steps of selecting a newly produced cold-rolled steel plate, wiping the surface grease of the plate by adopting alcohol before coating, coating hanging pieces on a target train rabbet coating production line, and selecting a plurality of representative samples from a steel electrophoresis plate for a train body to be evaluated;
b. And the pretreatment step is to conduct alcohol wiping and drying treatment on the surface of the electrophoresis board sample so as to remove greasy dirt, impurities and other pollutants on the surface. And (3) scribing the surface of the electrophoresis board by adopting the cutter width required by the target turning rabbet, and requiring that a paint film is just scratched to leak out of the steel substrate.
C. placing the pretreated sample in a preset corrosion environment for corrosion test, wherein the corrosion environment comprises a corrosion medium, temperature and corrosion time;
d. And performance detection, namely detecting the corrosion performance of the sample after the corrosion test is finished, wherein a detection item relates to the unilateral maximum corrosion width. After the detection, the maximum corrosion width of the surface of the electrophoresis plate sample was evaluated and recorded as xi, i, and 1,2,3, respectively.
E. And the data analysis step is that the detected data are brought into a prediction formula model, and the maximum single-side expansion width y of the plate after 1000 hours can be predicted, wherein y=alpha < 1+ > (alpha < 2 > -alpha <1 >)/(1+10 ((lgβ -x) ×γ)), and the data are expressed by alpha <1 > = 1.26494, alpha < 2 > = 3.66763, beta= 98.72110 and gamma= 2.23978.
F. And a quantitative evaluation step, namely carrying out quick and accurate quantitative evaluation on the corrosion performance of the steel electrophoresis board for the vehicle body according to the prediction formula model, and outputting a quantitative evaluation result.
Further, the method is particularly suitable for continuous annealing plates (without plating layers on the surfaces) in continuous annealing furnace internal humidification production, the chemical components of the continuous annealing plates meet the conditions that C is less than or equal to 0.003wt%, mn is 0.05-0.20wt% and Si is 0.002-0.010wt%, and the belt speed of the continuous annealing plates is 125-200 m/min during annealing.
Further, the method of the invention, wherein the sheet is particularly suitable for sheet surface roughness in the range of 0.7-1.5 μm and RPc in the range of 60-110 pieces/cm.
Further, the method of the invention, wherein the predictive formula model is particularly limited to the film treatment before coating, the film weight range is 20-35mg/m < 2 >, and the film thickness range is 15-25 mu m.
Further, the method provided by the invention is characterized in that the corrosion environment is a neutral salt spray corrosion environment, the corrosion medium is 10wt.% sodium chloride solution, the temperature is 40 ℃, and the detection time is 240 hours. Other test conditions the GB/T10125-2021 artificial atmosphere corrosion test salt spray test was performed.
The method further comprises the step of verifying the quantitative evaluation result, and the accuracy and the reliability of the prediction formula model are verified by comparing the quantitative evaluation result with a neutral salt fog detection result after the salt fog test of the GB/T10125-2021 artificial atmosphere corrosion test is carried out for 1000 hours.
The method further comprises grading the corrosion resistance of the steel electrophoresis board for the automobile body according to the quantitative evaluation result, preferably selecting the board with the highest surface quality as the board finally supplied to the customer, and providing corresponding improvement suggestions.
Due to the adoption of the technical scheme, the beneficial effects obtained by the invention are as follows:
The method can greatly shorten the detection period and remarkably reduce the test cost by establishing a standardized accelerated corrosion test flow and mathematical prediction model, can effectively improve the accuracy and repeatability of corrosion performance evaluation, and can realize the accurate prediction of long-term corrosion behavior and provide direct guidance for the improvement of a production process by a systematic quantitative analysis system, thereby comprehensively improving the quality control level and corrosion resistance evaluation efficiency of the vehicle body electrophoresis board and having wide application prospect and industrial popularization value.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
A rapid and accurate quantitative evaluation method for corrosion performance of a steel electrophoresis plate for a vehicle body, as shown in figure 1, comprises the following steps:
a. The preparation method comprises the steps of selecting a newly produced cold-rolled steel plate as a plate, wiping the surface grease of the plate by adopting alcohol before coating, coating hanging pieces on a target train rabbet coating production line, and selecting a plurality of representative electrophoresis plate samples from a steel electrophoresis plate for a train body to be evaluated;
b. The pretreatment step comprises the steps of conducting alcohol wiping and drying treatment on the surface of the electrophoresis board sample to remove greasy dirt, impurities and other pollutants on the surface, and scribing the surface of the electrophoresis board sample by adopting the cutter width required by a target train rabbet, wherein the requirement is that a paint film is just scratched to expose a steel substrate;
c. Placing the pretreated electrophoresis board sample in a preset corrosion environment for corrosion test, wherein the corrosion environment comprises a corrosion medium, temperature and corrosion time;
d. The performance detection step comprises the steps of detecting the corrosion performance of the electrophoresis board sample after the corrosion test is finished, wherein a detection item relates to a unilateral maximum corrosion width y, and after the detection is finished, evaluating the maximum corrosion width of the surface of the electrophoresis board sample, wherein the maximum corrosion width is respectively marked as x i, i can take values of 1,2 and 3;
e. The data analysis step is that the data obtained by the performance detection is brought into a prediction formula model ,y = α1 + (α2-α1)/(1 + 10^((lgβ-x) *γ)),α1=1.26494,α2=3.66763,β=98.72110,γ=2.23978, to predict the maximum single-side expansion width y and x of the plate after 1000 hours, and the maximum expansion width is x;
f. And a quantitative evaluation step, namely carrying out quick and accurate quantitative evaluation on the corrosion performance of the steel electrophoresis board for the vehicle body according to the prediction formula model, and outputting a quantitative evaluation result.
In the step a, the plate is suitable for continuous annealing plates produced by closed humidification in a continuous annealing furnace, the surface of the continuous annealing plate is free of a plating layer, the chemical components of the continuous annealing plate meet the requirements that C is less than or equal to 0.003wt%, mn is 0.05-0.20wt% and Si is 0.002-0.010wt%, and the belt speed of the continuous annealing steel plate is 125-200 m/min during annealing.
The surface roughness of the plate ranges from 0.7 to 1.5 mu m, and the RPc ranges from 60 to 110 pieces/cm.
In the step C, the corrosion environment is a neutral salt spray corrosion environment, the corrosion medium is 10wt.% sodium chloride solution, the temperature is 40 ℃, and the corrosion time is 240h.
In the step e, the prediction formula model is especially limited to a film processed before coating, wherein the film weight range is 20-35mg/m 2, and the film thickness range is 15-25 mu m.
The method further comprises a step g of,
G. and verifying the quantitative evaluation result, namely comparing the quantitative evaluation result with a neutral salt fog detection result after the salt fog test of the GB/T10125-2021 artificial atmosphere corrosion test is performed for 1000 hours so as to verify the accuracy and reliability of the prediction formula model.
The method further comprises the step of h,
H. And (3) grading the corrosion resistance, namely grading the corrosion resistance of the steel electrophoresis board for the vehicle body according to the quantitative evaluation result, preferably selecting the board with the highest surface quality as the board finally supplied to the customer, and providing corresponding improvement suggestions.
The technical scheme of the invention is further described in detail by examples.
Examples 1 to 6
Cold rolled sheet produced by a certain company is selected as a test material, test materials of example 1 and comparative example 1 are A, test materials of example 2 and comparative example 2 are B, test materials of example 3 and comparative example 3 are C for verifying the credibility of the end point value and the middle value of the parameter, test materials of example 4 and comparative example 4 are D, test materials of example 5 and comparative example 5 are E, test materials of example 6 and comparative example 6 are F for verifying the credibility of each key influencing factor.
The boards processed by the technical scheme are adopted in the embodiment 1, the embodiment 2 and the embodiment 3. Comparative example 1, comparative example 2 and comparative example 3 after neutral salt fog is carried out for 1000 hours by using a GB/T10125-2021 artificial atmosphere corrosion test salt fog test, the unilateral maximum corrosion width of the electrophoresis board is evaluated.
Example 4 to eliminate chemical control and chemical composition outside the scope of the present invention, other process flows and parameters were performed in accordance with the present technology. Example 5 is a control to eliminate the surface roughness related parameter, and the surface roughness related parameter is not within the scope of the present invention, and other process flows and parameters are performed according to the present invention. Example 6 to remove film weight and film thickness control, and film weight and film thickness parameters were not within the scope of the present invention, other process flows and parameters were performed according to the present invention. And the single-side maximum corrosion width of the electrophoresis plate is evaluated after neutral salt fog is carried out for 1000 hours by using a GB/T10125-2021 artificial atmosphere corrosion test salt fog test in comparative example 4, comparative example 5 and comparative example 6.
The rapid and accurate quantitative evaluation method for evaluating the corrosion performance of the steel electrophoresis board for the vehicle body by adopting the technical scheme comprises a sample preparation step, a pretreatment step, a corrosion test step, a performance detection step, a data analysis step and a quantitative evaluation step, and is specifically as follows:
(1) The sample preparation step comprises the step of selecting a newly produced cold-rolled steel plate, wherein the plate is particularly suitable for continuous annealing plates (without plating layers on the surfaces) in continuous annealing furnace internal humidification production, the chemical components of the plate meet the requirements of less than or equal to 0.003wt% of C, 0.05-0.20wt% of Mn and 0.002-0.010wt% of Si, and the annealing belt speed of the continuous annealing steel plate is 125-200 m/min. The sheet is particularly suitable for a sheet surface roughness range of 0.7-1.5 mu m and an RPc range of 60-110 pieces/cm. The range of RPc is a technical term, and we are familiar with the term "peak and trough number" of RPc, which is described in detail in the national standard "GBT 2523-cold rolled sheet metal (strip) surface roughness and peak number measurement method. PDF", which is called "peak number" in the standard, page 4 in PDF, page 2 in the document, and 3.4 peak numbers.
Before coating, wiping the grease on the surface of the plate by adopting alcohol, coating hanging pieces on a target train rabbet coating production line, and selecting a plurality of representative electrophoresis board samples from the steel electrophoresis board for the train body to be evaluated. The prediction model is especially limited to a film treated before coating, wherein the film weight range is 20-35mg/m 2, and the film thickness range is 15-25 mu m.
(2) And the pretreatment step is to conduct alcohol wiping and drying treatment on the surface of the electrophoresis board sample so as to remove greasy dirt, impurities and other pollutants on the surface. And (3) scribing the surface of the electrophoresis board by adopting the cutter width required by the target turning rabbet, and requiring that a paint film is just scratched to leak out of the steel substrate.
(3) And (3) placing the pretreated sample in a preset corrosion environment for corrosion test, wherein the corrosion environment comprises a corrosion medium, temperature and corrosion time. The corrosion environment is neutral salt mist corrosion environment, the corrosion medium is 10wt.% sodium chloride solution, the temperature is 40 ℃, and the corrosion time is 240h. Other experimental conditions a GB/T10125-2021 artificial atmosphere corrosion test salt spray test was performed.
(4) And the performance detection step is that after the corrosion test is finished, the corrosion performance of the electrophoresis board sample is detected, and the detection item relates to the unilateral maximum corrosion width y. After the test, the maximum corrosion width of the parallel test plate surfaces was evaluated and recorded as xi, i, 1,2,3, respectively.
(5) And a data analysis step, namely bringing data obtained by performance detection into a prediction formula model, wherein y=alpha 1 + (α2-α1)/(1+10 ((lgβ -x) ×γ)), wherein alpha 1=1.26494,α2 = 3.66763, β= 98.72110 and γ= 2.23978, and the maximum single-side corrosion width y of the plate after 1000 hours can be predicted.
(6) And a quantitative evaluation step, namely carrying out quick and accurate quantitative evaluation on the corrosion performance of the steel electrophoresis board for the vehicle body according to the quantitative relation model, and outputting a quantitative evaluation result.
In addition to this, a step g is included,
G. and verifying the quantitative evaluation result, namely comparing the quantitative evaluation result with a neutral salt fog detection result after the salt fog test of the GB/T10125-2021 artificial atmosphere corrosion test is performed for 1000 hours so as to verify the accuracy and reliability of the prediction formula model.
The method also comprises the step h of,
H. And (3) grading the corrosion resistance, namely grading the corrosion resistance of the steel electrophoresis board for the vehicle body according to the quantitative evaluation result, preferably selecting the board with the highest surface quality as the board finally supplied to the customer, and providing corresponding improvement suggestions.
1. What are the corresponding improvement suggestions?
Based on the quantitative evaluation results, the following improvement suggestions may be provided:
(1) The proposal of the plate is that if the predicted y value of a certain plate is continuously higher, the chemical composition of the plate is recommended to be adjusted (such as C, si content is reduced, mn content is optimized) or the production process is recommended (such as annealing process and surface roughness Ra and RPc values are optimized).
(2) The proposal for the coating process is that if the predicted y values of all the plates are high, the problem may be caused by the coating process. It is recommended to optimize the pre-coating treatment (e.g. adjusting film weight) or the electrophoresis process parameters (e.g. adjusting voltage, throwing power, to optimize film thickness and its uniformity).
(3) The proposal for detection and model is that if the short-term prediction result y and the long-term verification result y' are systematically deviated, the parameters (alpha 1, α2, beta, gamma) in the prediction model are calibrated and iteratively optimized to adapt to a new production line or material system.
2. How does the best quality sheet material to select?
And (3) optimizing according to the quantitative evaluation result output in the step (f), namely the predicted value of the maximum single-side expansion width y of 1000 h. And judging the plate corresponding to the electrophoresis plate sample with the smallest y value as the plate with the best suitability for the target coating system and the best surface quality.
Meanwhile, the y value needs to meet the internal quality control standard of the vehicle enterprise (for example, y is generally less than or equal to 1.5 or 2.0 mm). The preferable sequence is that a plate with the smallest y value is selected from samples meeting the quality standard, and if all the samples do not reach the standard, the plate with the smallest y value is selected as a reference for process improvement.
3. The patent is not only a detection method, but also an intelligent screening and optimizing guidance system.
The invention replaces the time-consuming long-term experiment by short-term experiment + model prediction, and finally aims to quickly and scientifically select the optimal material and provide an improvement direction, thereby saving a great deal of time and money cost.
The detection parameters of each detection item in each example are shown in table 1, the detection results of each example are shown in table 2, and the effect pair ratio is shown in table 3.
Table 1 key parameters of the examples
Table 2 results of the various examples
Table 3 effect comparison table
From tables 1-3, the method and the device are combined with a mathematical model through a standardized accelerated corrosion test, so that the efficiency, precision, consistency and effectiveness of corrosion performance evaluation of the steel electrophoresis board for the vehicle body are remarkably improved, and the experiment and time cost is saved. Particularly, the implementation effects of the embodiments 4 to 6 are not as good as the application, and the advantages, uniqueness and creativity of the control of the key factors of the technology are shown. The technology creatively provides scientific basis for coating process optimization and plate material selection, and has wide engineering application value and industry popularization prospect in research direction.
The above embodiments are only for illustrating the technical solution of the present invention and, although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention may be modified or equivalently replaced without departing from the spirit and scope of the present invention, and any modification or partial replacement thereof should be included in the scope of the claims of the present invention.
Claims (7)
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