EP-4738372-A1 - CONSTRUCTION METHOD FOR CORROSION-RESISTANCE DEGREE-MECHANICAL PROPERTY ANALYSIS MODEL OF METAL MATERIAL, AND USE THEREOF

EP4738372A1EP 4738372 A1EP4738372 A1EP 4738372A1EP-4738372-A1

Abstract

This application relates to a method for constructing a corrosion resistance-mechanical property analysis model for a metallic material and an application thereof. The method for constructing the analysis model includes: using a metallic material as a test object, acquiring a corrosion performance test experimental dataset at different equivalent corrosion time points under a corrosion test condition, and a mechanical property test experimental dataset at different corrosion degrees corresponding to the different equivalent corrosion time points; and establishing empirical relational expressions describing variations of a corrosion parameter and a mechanical parameter with equivalent corrosion time.

Inventors

JIA, Jun
WANG, QING
WANG, XIANG
LIN, Zhiquan
FENG, KAI
DU, Shangzhe

Assignees

Contemporary Amperex Technology Co., Limited
Shanghai Jiao Tong University

Dates

Publication Date: 20260506
Application Date: 20240904

Claims (20)

A method for constructing a corrosion resistance-mechanical property analysis model for a metallic material, comprising the following steps: using a metallic material as a test object, acquiring test values of a corrosion parameter at different equivalent corrosion time points under a corrosion test condition to obtain a corrosion performance test experimental dataset, and acquiring test values of a mechanical parameter at different corrosion degrees corresponding to the different equivalent corrosion time points to obtain a mechanical property test experimental dataset; wherein the corrosion test condition is used to simulate a target service environment of the metallic material; and the corrosion parameter comprises at least one of a corrosion degree and a corrosion rate; and establishing, based on the corrosion performance test experimental dataset, a first set of empirical relational expressions describing variation of the corrosion parameter with equivalent corrosion time, and establishing, based on the mechanical property test experimental dataset, a second set of empirical relational expressions describing variation of the mechanical parameter with equivalent corrosion time.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to claim 1, wherein the mechanical parameter comprises at least one of a tensile strength at break and an elongation at break.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to claim 1 or 2, wherein the mechanical parameter comprises a yield strength.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to any one of claims 1 to 3, wherein at least one of the following characteristics is met: the metallic material is an aluminum alloy material; or the metallic material is a metallic structural component, optionally an aluminum alloy structural component.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to any one of claims 1 to 4, wherein at least one of the following characteristics is met: the metallic material is any one of battery casing materials; optionally, the battery casing materials comprise a fuel cell casing material; optionally, the battery casing materials comprise a lithium battery casing material; or the metallic material comprises at least a portion of a structural component of a battery casing; optionally, the battery casing structural component comprises at least a portion of a structural component of a fuel cell casing; optionally, the battery casing structural component comprises at least a portion of a structural component of a lithium battery casing.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to any one of claims 1 to 5, wherein the corrosion performance test experimental dataset comprises at least a corrosion performance test experimental dataset under a salt spray corrosion test condition; optionally, the salt spray corrosion test condition comprises at least one of the following salt spray conditions: one or more of NaCl aqueous solution salt spray condition, acetic acid salt spray condition, copper-accelerated acetic acid salt spray condition, and alternating salt spray corrosion condition; optionally, the salt spray corrosion test condition comprises a NaCl aqueous solution salt spray condition; optionally, the NaCl aqueous solution salt spray condition comprises the following parameter: a simulated salt spray condition with a 3wt% to 6wt% NaCl aqueous solution at 34°C-36°C.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to any one of claims 1 to 6, wherein the establishing, based on the corrosion performance test experimental dataset, a first set of empirical relational expressions describing variation of the corrosion parameter with equivalent corrosion time comprises: for each type of corrosion parameter in the corrosion parameter, performing segmented fitting based on the corresponding corrosion performance test experimental dataset, and for each fitting interval, with the corresponding corrosion parameter as a dependent variable and the equivalent corrosion time as an independent variable, performing fitting in the form of a power function or a linear function to construct an empirical relational expression between each type of corrosion parameter and equivalent corrosion time for each fitting interval, thereby obtaining the first set of empirical relational expressions.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to claim 7, wherein in the first set of empirical relational expressions, a fitting form of the power function is y1 = A·x B , and a fitting form of the linear function is y1 = a + b·x; wherein x is the equivalent corrosion time, y1 is the corrosion parameter, A is a positive number, B is a negative number, b is a positive number, and a is a real number; optionally, a is a negative number.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to claim 8, wherein A is a real number selected from 0.01 to 1.00, B is a real number selected from -0.3 to -0.8, b is a real number selected from 0.001 to 0.05, and a is a real number selected from 0.02 to -0.8; optionally, a is a real number selected from -0.001 to -0.8, further optionally, a is a real number selected from -0.001 to -0.5; optionally, b is a real number selected from 0.001 to 0.02, further optionally, b is a real number selected from 0.001 to 0.01.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to any one of claims 1 to 9, wherein the corrosion performance test experimental dataset comprises at least one of a corrosion performance test experimental dataset under an electrochemical corrosion test condition and a corrosion performance test experimental dataset under an immersion corrosion test condition; optionally, a corrosion parameter in the corrosion performance test experimental dataset under the electrochemical corrosion test condition comprises at least one of a self-corrosion potential or a self-corrosion current; optionally, a corrosion parameter in the corrosion performance test experimental dataset under the immersion corrosion test condition comprises at least one of a corrosion degree and a corrosion rate.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to any one of claims 1 to 10, wherein the establishing, based on the mechanical property test experimental dataset, a second set of empirical relational expressions describing variation of the mechanical parameter with equivalent corrosion time comprises: for each type of mechanical parameter in the mechanical parameter, performing segmented fitting based on the corresponding mechanical property test experimental dataset, and for each fitting interval, with the corresponding mechanical parameter as a dependent variable and the equivalent corrosion time as an independent variable, performing fitting in the form of a power function or a linear function to construct an empirical relational expression between each type of mechanical parameter and the equivalent corrosion time, thereby obtaining the second set of empirical relational expressions.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to claim 11, wherein in the second set of empirical relational expressions, a fitting form of the power function is y2 = M·x N , and a fitting form of the linear function is y2 = m + n·x; wherein x is the equivalent corrosion time, y2 is the mechanical parameter, M is a positive number, N is a negative number, n is a negative number, and m is a positive number.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to claim 12, wherein M is a real number selected from 1 to 250, N is a real number selected from -0.01 to -1, n is a real number selected from -0.05 to -5, and m is a real number selected from 1 to 300; optionally, N is a real number selected from -0.01 to -0.5, further optionally, N is a real number selected from -0.01 to -0.2; optionally, n is a real number selected from -1 to -3; optionally, n is a real number selected from - 0.5 to -1.5; optionally, n is a real number selected from -0.05 to - 0.5.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to any one of claims 1 to 13, further comprising the following step: establishing a third set of empirical relational expressions between equivalent corrosion time under the corrosion test condition and service time in the target service environment.
The method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to any one of claims 1 to 14, comprising the following step: establishing a fourth set of empirical relational expressions between a corrosion rate and equivalent corrosion time under the corrosion test condition, wherein the first set of empirical relational expressions comprises the fourth set of empirical relational expressions.
A method for analyzing service life of a metallic material, wherein the metallic material is as defined in any one of claims 1 to 3; and the method for analyzing service life of a metallic material comprises: determining a mechanical parameter related to a failure behavior of the metallic material based on a target service environment of the metallic material, determining a corrosion test condition capable of simulating the target service environment, and acquiring a test value of a corrosion degree of the metallic material under the corrosion test condition; and obtaining a service life parameter of the metallic material under the corrosion test condition based on the test value of the corrosion degree, an effective state threshold of the mechanical parameter, and a corrosion resistance-mechanical property analysis model for the metallic material; wherein the corrosion resistance-mechanical property analysis model for the metallic material comprises at least the following relational expressions: a first set of empirical relational expressions describing variation of a corrosion parameter characterizing the corrosion degree with equivalent corrosion time, and a second set of empirical relational expressions describing variation of the mechanical parameter with equivalent corrosion time.
The method for analyzing service life of a metallic material according to claim 16, wherein the service life parameter comprises at least the equivalent corrosion time.
The method for analyzing service life of a metallic material according to claim 16 or 17, wherein the obtaining a service life parameter of the metallic material under the corrosion test condition based on the test value of the corrosion degree, an effective state threshold of the mechanical parameter, and a corrosion resistance-mechanical property analysis model for the metallic material comprises: obtaining remaining service time of the metallic material based on the test value of the corrosion degree, the effective state threshold of the mechanical parameter, the corrosion resistance-mechanical property analysis model for the metallic material, and a third set of empirical relational expressions between the equivalent corrosion time under the corrosion test condition and the service time in the target service environment.
The method for analyzing service life of a metallic material according to any one of claims 16 to 18, wherein the mechanical parameter comprise at least two types, and the mechanical parameters are sorted in descending order by degrees of response to failure of the metallic material, and the corrosion resistance-mechanical property analysis model for the metallic material is obtained based on the mechanical parameter ranked first.
The method for analyzing service life of a metallic material according to any one of claims 16 to 19, wherein the corrosion resistance-mechanical property analysis model for a metallic material is constructed according to the method for constructing a corrosion resistance-mechanical property analysis model for a metallic material according to any one of claims 1 to 15.

Description

RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. CN2023116080448, filed on November 27, 2023 and entitled "METHOD FOR CONSTRUCTING CORROSION RESISTANCE-MECHANICAL PROPERTY ANALYSIS MODEL FOR METALLIC MATERIAL AND APPLICATION THEREOF", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the technical field of corrosion resistance testing and analysis of metallic materials and the technical field of battery technology, further relates to a method for constructing a corrosion resistance-mechanical property analysis model for a metallic material and an application thereof, and still further, relates to a method for constructing a corrosion resistance-mechanical property analysis model for metallic materials, a method and an apparatus for analyzing a service life of a metallic material, a method and an apparatus for analyzing a mechanical property of a metallic material, a computer device, a computer-readable storage medium, and an electric apparatus. BACKGROUND The statements herein merely provide background information related to this application and do not necessarily constitute prior art. The design and development of battery casing materials require high structural strength and corrosion resistance, which are critical to the safe operation of batteries and electric apparatuses as a whole. Taking fuel cell casing materials as an example, current research on the corrosion behavior and mechanisms of fuel cell casing materials usually focuses only on the electrochemical corrosion behavior of fuel cell casing materials or corrosion rates in different corrosive media, making it difficult to provide effective guidance for the design and development of fuel cell casing materials. SUMMARY According to various implementations and embodiments of this application, this application provides a method for constructing a corrosion resistance-mechanical property analysis model for a metallic material, a method and an apparatus for analyzing service life of a metallic material, a method and an apparatus for analyzing a mechanical property of a metallic material, a computer device, a computer-readable storage medium, and an electric apparatus. The corrosion resistance-mechanical property analysis model for a metallic material can be effectively used for predicting mechanical properties and evaluating service life of the metallic material. The metallic material involved may include, but is not limited to, an aluminum alloy material, and may also include, but is not limited to, a battery casing material. According to a first aspect, this application provides a method for constructing a corrosion resistance-mechanical property analysis model for a metallic material. In some embodiments, the method for constructing the analysis model includes the following steps: using a metallic material as a test object, acquiring a corrosion performance test experimental dataset at different equivalent corrosion time points under a corrosion test condition, and a mechanical property test experimental dataset at different corrosion degrees corresponding to the different equivalent corrosion time points; and establishing empirical relational expressions describing variations of a corrosion parameter and a mechanical parameter with equivalent corrosion time. Further, the corrosion test condition may be used to simulate a target service environment. In some embodiments, a method for constructing a corrosion resistance-mechanical property analysis model for a metallic material is provided, including the following steps: using a metallic material as a test object, acquiring test values of a corrosion parameter at different equivalent corrosion time points under a corrosion test condition to obtain a corrosion performance test experimental dataset, and acquiring test values of a mechanical parameter at different corrosion degrees corresponding to the different equivalent corrosion time points to obtain a mechanical property test experimental dataset; where the corrosion test condition is used to simulate a target service environment of the metallic material; and the corrosion parameter includes at least one of a corrosion degree and a corrosion rate; andestablishing, based on the corrosion performance test experimental dataset, a first set of empirical relational expressions describing variation of the corrosion parameter with equivalent corrosion time, and establishing, based on the mechanical property test experimental dataset, a second set of empirical relational expressions describing variation of the mechanical parameter with equivalent corrosion time. Using the metallic material as the test object, the target service environment of the metallic material is simulated using the corrosion test condition, to obtain the corrosion performance test experimental dataset at different equivalent corrosion time points and the mechanical property test experimental dat