CN-122016631-A - Electrochemical corrosion and durability detection method of PET (polyethylene terephthalate) based adhesive tape in electrolyte

CN122016631ACN 122016631 ACN122016631 ACN 122016631ACN-122016631-A

Abstract

The invention relates to an electrochemical corrosion and durability detection method of a PET (polyethylene terephthalate) base adhesive tape in the field of intelligent manufacturing, which comprises the steps of obtaining initial surface morphology data of a material in an electrochemical environment, determining microstructure characteristics according to the initial surface morphology data, obtaining electric field distribution data in the electrochemical environment, determining ion migration characteristics according to the electric field distribution data, determining the initial state of material surface corrosion according to the ion migration characteristics and electrochemical impedance spectrum measurement values, obtaining corrosion morphology evolution data according to the initial state of surface corrosion, determining corrosion-dissolution associated parameters according to the corrosion morphology evolution data and concentration data of dissolution substances in the electrolyte, analyzing the dynamic relation between microscopic changes of the material surface and the concentration of dissolution substances according to the corrosion-dissolution associated parameters, and obtaining a material tolerance degradation trend, and predicting a durability evaluation result of the material in a long-term electrochemical environment according to the material tolerance degradation trend.

Inventors

DAI JINCHANG
HUANG DONGCHUN
XIE DONG
Dai Zuqiang
CHEN JUNQIANG

Assignees

东莞市欣美电子材料有限公司

Dates

Publication Date: 20260512
Application Date: 20260302

Claims (9)

1. The electrochemical corrosion and durability detection method for the PET-based adhesive tape in the electrolyte is characterized by comprising the steps of S101, S102, S103, S104, S105, and S106, wherein initial surface morphology data of a material in an electrochemical environment are obtained, microstructure characteristics are determined according to the initial surface morphology data, electric field distribution data in the electrochemical environment are obtained, ion migration characteristics are determined according to the electric field distribution data, the initial state of material surface corrosion is determined according to the ion migration characteristics and electrochemical impedance spectrum measurement values, the evolution data of the corrosion morphology are obtained according to the initial state of surface corrosion, the corrosion-dissolution correlation parameters are determined according to the evolution data of the corrosion morphology and the concentration data of dissolved matters in the electrolyte, and if the concentration distribution data of dissolved matters exceeds a preset threshold value, a correlation model of corrosion pit depth and concentration of dissolved matters is established through a regression analysis method, and the corrosion-dissolution correlation parameters are determined; S107, analyzing the dynamic relation between microscopic change of the material surface and the concentration of the dissolved matters according to the corrosion-dissolution correlation parameters to obtain a material tolerance degradation trend, and S108, predicting a durability evaluation result of the material in a long-term electrochemical environment according to the material tolerance degradation trend.
2. The electrochemical corrosion and durability detection method for the PET-based adhesive tape in the electrolyte is characterized by further comprising the steps of obtaining initial surface morphology data generated by imaging a material surface by a high-resolution scanning electron microscope, extracting microstructure characteristic values according to the initial surface morphology data, separating pore areas by an image segmentation algorithm if the characteristic values show that the surface has a pore structure, calculating the area ratio and the distribution density of the pore areas, judging the permeation risk level of the electrolyte according to the distribution density of the pore areas, and carrying out correlation analysis on the permeation risk level and the characteristic values by a support vector machine model.
3. The electrochemical corrosion and durability detection method of the PET-based adhesive tape in the electrolyte is characterized by further comprising the steps of obtaining a geometric model and material attribute parameters of a battery structure, setting according to the material attribute parameters and boundary conditions, constructing a finite element calculation grid, applying an alternating electric field with specific frequency values and amplitude parameters as an excitation source, solving a Maxwell equation set by adopting a finite element method to obtain electric field distribution data, calculating ion migration rate according to the electric field distribution data and ion type characteristics, integrating the ion migration rate data and distribution diagram, and determining a spatial distribution mode of electric field induction characteristics.
4. The method for detecting electrochemical corrosion and durability of the PET-based adhesive tape in the electrolyte according to claim 1, wherein the step S103 is further characterized by comprising the steps of obtaining an electrochemical impedance spectrum measurement value, calculating a charge transfer resistance according to the measurement value, determining a surface corrosion initial state if the charge transfer resistance is smaller than a preset threshold value, separating ion migration characteristics from the impedance spectrum, calculating a dynamic parameter according to the ion migration characteristics, and analyzing the change relation between the dynamic parameter and the corrosion initial state by adopting linear regression.
5. The electrochemical corrosion and durability detection method for the PET-based adhesive tape in the electrolyte is characterized by further comprising the steps of obtaining a surface initial state topography map obtained through atomic force microscope scanning, identifying corrosion pit areas according to the topography map, extracting depth values and area values of each corrosion pit, processing the depth values and the area values by adopting a clustering algorithm to obtain a depth set and an area set, generating a depth distribution map according to the depth set, generating an area change map according to the area set, judging that a plurality of dominant mechanisms exist in a corrosion process if the depth distribution map shows multimodal characteristics, and determining the evolution stage of surface corrosion according to the evolution data and the distribution map.
6. The electrochemical corrosion and durability detection method for the PET-based adhesive tape in the electrolyte is characterized by further comprising the steps of obtaining corrosion pit depth distribution data and electrolyte dissolved matter spectrum concentration data, establishing the correlation between data sources according to pit depth distribution form and dissolved matter concentration values, processing the pit depth data and the dissolved matter concentration data by a principal component analysis method, determining a principal component as a correlation factor if a first principal component variance contribution rate in a principal component analysis result exceeds a preset threshold value, calculating comprehensive correlation indexes of pit depth distribution and dissolved matter concentration according to the correlation factors, and judging the evolution trend of a corrosion state by using a support vector machine algorithm with the comprehensive correlation indexes as input.
7. The electrochemical corrosion and durability detection method for the PET-based adhesive tape in the electrolyte is characterized by further comprising the steps of obtaining the dissolution concentration data of the monitoring points, extracting corrosion pit depth values corresponding to the monitoring points if the dissolution concentration data exceeds a preset threshold line, taking the dissolution concentration data exceeding the threshold value as independent variables, taking the corrosion pit depth values as dependent variables to form a data point set, fitting the data point set by a regression method to obtain a correlation model, calculating residual values according to the correlation model, evaluating fitting effects, judging whether the residual values meet significance requirements, and determining a parameter set from the correlation model if the residual values meet significance requirements.
8. The electrochemical corrosion and durability detection method for the PET-based adhesive tape in the electrolyte is characterized by further comprising the steps of obtaining a time sequence surface microscopic image sequence of a material in a corrosion environment and the dissolution concentration data of corresponding time points, extracting the shape change quantity of each time point from the surface microscopic image sequence by image processing, calculating corrosion dissolution associated parameters of each time point according to the shape change quantity and the dissolution concentration values, carrying out cluster analysis on the corrosion dissolution associated parameters of all the time points by adopting a K-means clustering algorithm, judging that the material tolerance is degraded if the clustering result shows that the parameter values migrate to a high value category along with time, and generating a material tolerance degradation trend line according to cluster migration path fitting of the parameter values.
9. The electrochemical corrosion and durability detection method for the PET-based adhesive tape in the electrolyte is characterized by further comprising the steps of obtaining a material tolerance historical degradation data sequence of a material in an electrochemical environment, processing the degradation data sequence by adopting a time sequence analysis method to obtain a long-term degradation trend of material performance, establishing a prediction model of performance attenuation and time variation according to the long-term degradation trend, inputting electrochemical environment parameters into the prediction model, outputting a material performance predicted value of a future time point by the model, judging that the material fails at the corresponding time point if the material performance predicted value is lower than a preset failure threshold, and obtaining a durability assessment result of the material in the long-term electrochemical environment by integrating failure judgment at all time points.

Description

Electrochemical corrosion and durability detection method of PET (polyethylene terephthalate) based adhesive tape in electrolyte Technical Field The invention relates to the field of intelligent manufacturing, in particular to a PET adhesive tape, and specifically relates to an electrochemical corrosion and durability detection method of a PET-based adhesive tape in electrolyte. Background The field of material performance testing is important to ensure the safety and stability of high-performance equipment such as batteries, and particularly, the material tolerance detection under the electrolyte environment directly relates to the service life and the use safety of the batteries. With the rapid development of new energy technology, the durability of materials inside batteries has become a focus of industry attention. However, existing detection methods have significant drawbacks in simulating a real battery operating environment. Many methods only focus on static soaking or single environmental factors, and it is difficult to comprehensively reflect the performance degradation of materials in complex electrochemical environments. In particular, the prior art often ignores the influence of a dynamic electric field on material corrosion, and lacks correlation analysis between microscopic changes on the surface of the material and dissolved matters in electrolyte, so that a detection result deviates from an actual application scene, and the performance of the material in long-term use is difficult to accurately predict. In this field, the core challenges are focused on how to effectively simulate the complex electrochemical environment inside the battery and its dynamic impact on the materials. First, the presence of alternating electric fields in battery operation accelerates ion migration, significantly affecting the corrosion rate of the material, but existing methods have difficulty in precisely controlling and simulating the effects of such dynamic electric fields. For example, certain PET-based tapes may undergo irreversible surface corrosion in the electrolyte due to electric field-induced rapid ion migration, but conventional testing has difficulty capturing this process. Secondly, the correlation between the corrosion morphology of the material surface and the concentration of the dissolved matter in the electrolyte is not effectively quantified, so that the degradation degree of the material cannot be accurately estimated. For example, tiny corrosion pits may appear on the surface of the tape, but the depth profile of these pits is not clearly established with respect to the concentration of the dissolution, affecting the scientificity of the tolerability assessment. These two technical factors are interrelated in that the field-accelerated ion migration directly leads to an increased corrosion of the surface, whereas the change in corrosion morphology further affects the dynamic evolution of the concentration of the dissolution. Therefore, how to simulate the complex electrochemical environment of a battery and accurately quantify the correlation between the corrosion morphology of the material surface and the concentration of dissolved matters under the action of an alternating electric field becomes a key problem for improving the scientificity and the accuracy of the detection of the electrolyte tolerance of the PET-based adhesive tape. Disclosure of Invention The invention provides a method for detecting electrochemical corrosion and durability of a PET (polyethylene terephthalate) base adhesive tape in electrolyte, which mainly comprises the following steps: The method comprises the steps of obtaining initial surface morphology data of a material in an electrochemical environment, determining microstructure characteristics according to the initial surface morphology data, obtaining electric field distribution data in the electrochemical environment, determining ion migration characteristics according to the electric field distribution data, determining a material surface corrosion initial state according to the ion migration characteristics and electrochemical impedance spectrum measured values, obtaining corrosion morphology evolution data according to the surface corrosion initial state, determining corrosion-dissolution related parameters according to the corrosion morphology evolution data and dissolution concentration data in electrolyte, analyzing dynamic relations between microscopic changes of the material surface and dissolution concentration according to the corrosion-dissolution related parameters, obtaining material tolerance degradation trend, and predicting a durability evaluation result of the material in the long-term electrochemical environment according to the material tolerance degradation trend. Further, the method comprises the steps of obtaining initial surface morphology data of a material in an electrochemical environment, determining microstructure characteristics a