A test device and quantitative evaluation method for realizing stress-wear-corrosion coupling environment

Abstract

The present application relates to a kind of test device and quantitative evaluation method for realizing stress-wear-corrosion coupling environment, belong to material failure analysis field, including stress loading mechanism for stress loading to sample, for the corrosion mechanism of electrochemical corrosion test to sample and for the wear mechanism of wear to sample.The wear, stress, corrosion coupling test device of the present application, can establish wear, stress, corrosion coupling test process, can be closer to actual service condition under research the service behavior of various metal materials and metal matrix composite, obtain the key behavior data under the coupling of multiple factors, quantitative analysis wear, corrosion, wear-corrosion interaction, stress-wear interaction, stress-corrosion interaction, reveal the key environmental factor and material damage mechanism under the coupling of wear, stress, corrosion, provide basis for building material service behavior evaluation method.

Description

Technical Field

[0001] This invention belongs to the field of material failure analysis, specifically relating to a testing device and quantitative evaluation method for realizing a stress-wear-corrosion coupled environment. It can not only test the damage behavior of metallic materials under stress-wear-corrosion coupled environment, but also quantitatively analyze the effects of different environmental factors on the damage of metallic materials. Background Technology

[0002] When marine engineering equipment operates in seawater environments, its critical moving components (such as the buoyancy adjustment system of deep-sea submersibles, seawater hydraulic transmission systems, submarine stern shafts and their sliding support bearings, and underwater robotic arms) not only suffer from corrosion caused by the seawater environment but also bear the effects of wear loads and static tensile loads, leading to multi-factor coupled damage caused by stress-corrosion-wear interactions. Currently, research on the properties of metallic materials used in marine engineering equipment focuses only on the interaction mechanisms of single or two environments, such as wear, corrosion, fatigue, stress corrosion cracking, and corrosive wear. There is a lack of experimental equipment and evaluation methods for the service behavior of metallic materials under the coupled stress-wear-corrosion environment.

[0003] Chinese Patent Publication No. CN 103926146 A discloses a method and apparatus for evaluating stress corrosion resistance of small samples under constant load. This method and apparatus can be used to determine the stress corrosion cracking characteristics of thin-walled tubes and small-sized components for which standard samples cannot be machined. Based on the test results, the suitability of the component material can be determined, thus enabling material selection and suitability evaluation for thin-walled tubes and small-sized components. Chinese Patent Publication No. CN 107478528 A discloses a testing method for corrosion wear, primarily targeting dynamic corrosion wear life testing under wear and corrosion conditions. It proposes a test method simulating corrosion wear service conditions, which can be used to measure electrochemical corrosion wear in dynamic corrosion wear, effectively illustrating the quantitative study of corrosion during the wear process. Therefore, there are currently many testing methods available for evaluating the performance of materials under the interaction of single or two environmental factors, including wear tests, corrosion tests, fatigue tests, stress corrosion C-ring tests or slow tensile tests, and corrosion wear tests. Some of these evaluation methods already have published patents and national standards.

[0004] In recent years, Chinese Patent Publication No. CN 110940605 A disclosed a test device for the coupled effects of wear, stress, and corrosion on heat transfer tubes and a method for evaluating the service behavior of heat transfer tubes. This device can establish a test process for the coupled effects of wear, stress, and corrosion, allowing for the study of the service behavior of heat transfer tubes under conditions closer to actual service conditions. It can obtain key behavioral data under the coupled effects of multiple factors, reveal the failure mechanism of heat transfer tubes under the coupled effects of wear, stress, and corrosion, and provide a foundation for constructing a method for evaluating the service behavior of heat transfer tubes. However, this test device and evaluation method cannot simultaneously monitor parameters related to wear resistance and corrosion resistance, such as friction coefficient, current, and potential, and cannot quantitatively measure key environmental factors in a multi-factor coupled environment. Therefore, it is necessary to invent a test device for realizing a stress-wear-corrosion coupled environment and a method for quantitatively measuring environmental factors. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a testing device and quantitative evaluation method for realizing a stress-wear-corrosion coupled environment.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A testing device for realizing a stress-wear-corrosion coupled environment includes a stress loading mechanism for stressing a sample, a corrosion mechanism for electrochemical corrosion testing of the sample, and a wear mechanism for wearing the sample. The stress loading mechanism applies stress to the sample through spring deformation. The corrosion mechanism includes a corrosion chamber with an opening at the top, which facilitates the addition of electrolyte and allows for adjustment of the Cl content in the electrolyte. - The concentration and pH value alter the corrosive environment, and secondly, facilitate the reciprocating motion of the friction components of the wear mechanism; the wear mechanism uses a friction and wear testing machine to wear the sample, applying different wear loads and wear frequencies. The material can be any metal or metal-based composite material.

[0008] Preferably, the stress loading mechanism includes a support frame, screws, loading bolts, loading nuts and rectangular compression springs. The screws and loading bolts are provided with reserved grooves at the ends connected to the specimen. The specimen has reserved circular holes at both ends. The two ends of the specimen are respectively inserted into the reserved grooves of the screws and loading bolts and connected by pins.

[0009] A rectangular compression spring is positioned between the support frame and the loading nut. Different sizes of rectangular compression springs are selected for different applied stresses. By tightening the loading nut, the rectangular compression spring deforms. The deformation is measured based on the displacement distance of the loading nut, and the applied stress value can be determined according to Hooke's Law.

[0010] Preferably, to ensure that the specimen does not twist during stress loading, the loading bolts and loading nuts are machined into hexagonal shapes, and hexagonal holes are provided on the support frame. During installation, the screws and loading bolts pass through the hexagonal holes to achieve a fixed connection between their ends and the two ends of the specimen.

[0011] Preferably, during the chemical corrosion test, the surface of the sample other than the test surface is insulated and sealed with a rubber plug; through holes are provided on both sides of the corrosion chamber, and rubber plugs are placed in the through holes. The rubber plugs are cut into cuboids to facilitate the two ends of the sample to pass through the rubber plugs, and the sample and the edge of the rubber plug are sealed with sealant.

[0012] The corrosion chamber sidewall is provided with a reserved hole for inserting a reference electrode and a counter electrode. This invention is achieved through a three-electrode system, which includes a working electrode (the sample itself), a reference electrode, and a counter electrode (auxiliary electrode).

[0013] Preferably, a pad of appropriate height is provided at the bottom of the corrosion chamber to ensure the wear process can proceed and reduce the wear load on both ends of the corrosion chamber. The pad is made of non-conductive material, preferably plastic.

[0014] More preferably, the friction and wear testing machine includes a grinding ball and a clamping mechanism. The grinding ball and clamping mechanism includes a grinding ball, a spring chuck (ER chuck), and a sleeve. The grinding ball is installed in the spring chuck, and the grinding ball is fixed by tightening the sleeve. The grinding ball contacts the sample and is driven by a servo motor to perform left and right reciprocating motion to achieve wear on the sample.

[0015] Further preferably, the number of testing devices is multiple, preferably three, to facilitate the setting up of control experiments.

[0016] A further optimized process is as follows:

[0017] Insulate both ends of the processed sample with insulating tape, then install it in the corrosion chamber. Before installation, place a pad under the sample and seal both ends with rubber plugs to prevent electrolyte leakage. Insert the reference electrode and counter electrode into the reserved holes on the side wall of the corrosion chamber, and then fix the screws and loading bolts to the support frame. Insert both ends of the sample into the reserved slots of the screws and loading bolts. Fix the rectangular compression spring and loading nut to the loading bolts in sequence. Install the cylindrical pin, inserting the pin into the reserved circular holes of the screws and sample. The diameter of the circular hole is the same as the cylindrical diameter of the pin.

[0018] The three sets of testing devices operate on the same principle. The purpose of setting up three sets is to establish a control experiment, which can be conducted sequentially. The reference electrode and the counter electrode are installed sequentially in the corrosion chambers of the three sets of testing devices. The prepared corrosion solution is injected into the corrosion chamber. Wear load and wear frequency are set in the wear testing machine. The grinding ball (spherical Si3N4 ceramic ball) is moved downward through the wear testing machine to contact the sample, and a downward load is applied. The relative reciprocating sliding between the grinding ball and the sample achieves wear. Thus, the sample is subjected to the stress caused by the loading bolt, the corrosion caused by the environmental medium in the corrosion chamber, and the wear caused by the reciprocating sliding of the grinding ball, resulting in damage under the stress-wear-corrosion coupling effect.

[0019] A quantitative evaluation method for the above-mentioned test apparatus for realizing a stress-wear-corrosion coupled environment is provided. The evaluation method is based on the stress, wear, and corrosion coupled effect test constructed by the test apparatus of this invention. It supplements the influence of stress on wear and corrosion with the corrosion-wear model (ASTM G119-09), quantifying the roles of six key environmental factors—wear, corrosion, corrosion-on-wear, wear-on-corrosion, stress-on-corrosion, and stress-on-wear—in the coupled environment, including:

[0020] (1) The total material loss rate T during wear corrosion was calculated using the corrosion wear model (ASTM G119-09). W+C Wear rate without corrosion W0, corrosion rate without wear C0, effect of corrosion on wear rate ΔW C The effect of wear on corrosion rate ΔC W ;

[0021] (2) Calculate the total material loss rate T under stress-wear-corrosion coupling. S+W+C The effect of stress on wear corrosion ΔT S The effect of stress on corrosion ΔC S The effect of stress on wear ΔW S .

[0022] Preferably, the wear-corrosion interaction in step (1) adopts the following formula:

[0023] T W+C =W0+C0+ΔC W +ΔW C

[0024] in,

[0025]

[0026]

[0027]

[0028] ΔW C =T W+C -(W0+C0+ΔC W )

[0029] In the formula, V W+C The surface wear volume during corrosion wear, in mm. 3 V0 represents the surface wear volume during pure wear, in mm. 3 A represents the exposed area of ​​the sample in the corrosive solution, in mm. 2 t is the coupling time, in hours; K1 is a constant 3.27 × 10⁻⁶. -3 mm·g·(μA·cm·yr)⁻¹;i C i represents the corrosion current during pure corrosion, in μA·cm². W+C ρ is the corrosion current during corrosion wear, μA·cm2; EW is the equivalent mass of the sample, and ρ is the density of the sample, g·cm-3;

[0030] If ΔC W >0 indicates that wear accelerates corrosion; if ΔC W <0 indicates that wear has an inhibitory effect on corrosion; if ΔW C >0 indicates that corrosion accelerates wear; if ΔW C <0 indicates that corrosion has an inhibitory effect on wear.

[0031] Preferably, the wear-corrosion interaction in step (2) adopts the following formula:

[0032] T S+W+C =T W+C +ΔT S

[0033] In the formula,

[0034]

[0035]

[0036] The effect of stress on wear corrosion ΔT S It can also be divided into the effect of stress on wear ΔC S The effect of stress on corrosion ΔW S ;

[0037]

[0038] ΔW S =ΔT S -ΔC S

[0039] In the formula, V S+W+C The surface wear volume under stress-corrosion-wear coupling is expressed in mm. 3 i S+W+C The corrosion current under stress-corrosion-wear coupling is expressed in μA·cm. 2 ;

[0040] If ΔC S A value greater than 0 indicates that stress accelerates corrosion. If ΔC > 0, it means that stress has an accelerating effect on corrosion. S <0 indicates that stress has an inhibitory effect on corrosion; if ΔW S >0 indicates that stress accelerates wear; if ΔW S <0 indicates that stress has an inhibitory effect on wear.

[0041] For any details not covered in this invention, please refer to the prior art.

[0042] The beneficial effects of this invention are as follows:

[0043] The wear, stress, and corrosion coupling test apparatus of this invention can establish a wear, stress, and corrosion coupling test process, enabling the study of the service behavior of various metallic materials and metal matrix composites under conditions closer to actual service conditions. It can obtain key behavioral data under the coupling effect of multiple factors, quantitatively analyze the effects of wear, corrosion, wear-corrosion interaction, stress-wear interaction, and stress-corrosion interaction, reveal the key environmental factors and material damage mechanisms under the coupling effect of wear, stress, and corrosion, and provide a foundation for constructing a material service behavior evaluation method. Attached Figure Description

[0044] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0045] Figure 1 This is a partial cross-sectional view of the testing device for realizing the stress-wear-corrosion coupled environment of the present invention;

[0046] Figure 2 This is a top view of the testing device for realizing a stress-wear-corrosion coupled environment according to the present invention;

[0047] Figure 3 The potentiodynamic polarization curves and corrosion current densities of titanium alloy samples under three environments: corrosion, corrosion-wear, and corrosion-wear-stress are shown. (a) is the potentiodynamic polarization curve, and (b) is the corrosion current density.

[0048] Figure 4The wear track morphology of titanium alloy samples under three environments: corrosion, corrosion-wear, and corrosion-wear-stress. Among them, (a) is the wear track morphology under the corrosion environment, (b) is the wear track morphology under the corrosion-wear environment, and (c) is the wear track morphology under the corrosion-wear-stress environment.

[0049] Figure 5 The wear volume of the titanium alloy sample under three environments: wear, corrosion-wear, and corrosion-wear-stress.

[0050] In the figure, 1. Support frame; 2. Screw; 3. Pin; 4. Corrosion chamber; 5. Reference electrode; 6. Grinding ball and clamping mechanism; 7. Counter electrode; 8. Rectangular compression spring; 9. Loading nut; 10. Loading bolt; 11. Rubber stopper; 12. Pad; 13. Sample. Detailed implementation method:

[0051] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. However, this is not the only description; all aspects not described in detail herein are based on conventional techniques in the art.

[0052] Example 1

[0053] A testing device that realizes a stress-wear-corrosion coupled environment, such as Figures 1-2 As shown, it includes a stress loading mechanism for applying stress to the sample, a corrosion mechanism for conducting electrochemical corrosion tests on the sample, and a wear mechanism for wearing the sample. The stress loading mechanism applies stress to the sample through spring deformation; the corrosion mechanism includes a corrosion chamber 4 with an opening at the top, which facilitates the addition of electrolyte through the opening and allows for adjustment of the Cl content in the electrolyte. - The concentration and pH value alter the corrosive environment, and secondly, facilitate the reciprocating motion of the friction components in the wear mechanism. The wear mechanism uses a friction and wear testing machine to wear the sample, applying different wear loads and frequencies. The material can be any metal or a metal-based composite material.

[0054] The stress loading mechanism includes a support frame 1, screws 2, loading bolts 10, loading nuts 9 and a rectangular compression spring 8. The screws 2 and loading bolts 9 are provided with reserved grooves at the ends connected to the specimen 13. The specimen has reserved circular holes at both ends. The two ends of the specimen are inserted into the reserved grooves of the screws 2 and loading bolts 10 respectively and connected by pins 3.

[0055] A rectangular compression spring 8 is positioned between the support frame 1 and the loading nut 9. Different specifications of rectangular compression springs are selected for different applied stresses. By tightening the loading nut 9, the rectangular compression spring 8 deforms. The deformation is measured based on the displacement distance of the loading nut, and the applied stress value can be determined according to Hooke's Law.

[0056] To ensure that the specimen does not twist during stress loading, the loading bolts and loading nuts are machined into hexagonal shapes, and hexagonal holes are provided on the support frame 1. During installation, the screws 2 and loading bolts 10 pass through the hexagonal holes to achieve a fixed connection between their ends and the two ends of the specimen.

[0057] During the chemical corrosion test, except for the test surface, the other sample surfaces are insulated and sealed with rubber plugs 11. Through holes are provided on both sides of the corrosion chamber 4, and rubber plugs 11 are placed in the through holes. The rubber plugs 11 are cut into cuboids to facilitate the two ends of the sample to pass through the rubber plugs. The sample and the edge of the rubber plug are sealed with sealant.

[0058] The corrosion chamber 4 has a reserved hole on its side wall for inserting the reference electrode 5 and the counter electrode 7. This invention is achieved through a three-electrode system, which includes a working electrode (the sample itself), a reference electrode, and a counter electrode (auxiliary electrode).

[0059] A pad 12 of appropriate height is provided at the bottom of the corrosion chamber 4 to ensure the wear process proceeds and reduce the wear load on both ends of the corrosion chamber. The pad 12 is made of non-conductive material, preferably plastic.

[0060] In a further preferred embodiment, the friction and wear testing machine includes a grinding ball and a clamping mechanism 6. The grinding ball and clamping mechanism includes a grinding ball, a spring chuck (ER chuck), and a sleeve. The grinding ball is installed in the spring chuck, and the grinding ball is fixed by tightening the sleeve. The grinding ball contacts the sample and is driven by a servo motor to perform left and right reciprocating motion to achieve wear on the sample.

[0061] Further preferably, the number of testing devices is multiple, preferably three, to facilitate the setting up of control experiments.

[0062] A further optimized process is as follows:

[0063] Insulate both ends of the processed sample 13 with insulating tape, and then install it in the corrosion chamber 4. Before installation, place a pad 12 under the sample and seal both ends with rubber plugs 11 to prevent electrolyte leakage. Insert the reference electrode 5 and the counter electrode 7 into the reserved holes on the side wall of the corrosion chamber 4. Then fix the screw 2 and the loading bolt 9 on the support frame 1. Insert both ends of the sample into the reserved slots of the screw and the loading bolt. Fix the rectangular compression spring 8 and the loading nut 9 on the loading bolt 10 in sequence. Install the cylindrical pin 3. Insert the pin 3 into the reserved circular hole of the screw and the sample. The diameter of the circular hole is the same as the cylindrical diameter of the pin.

[0064] The three sets of testing devices operate on the same principle. The purpose of setting up three sets is to establish a control experiment, which can be conducted sequentially. The reference electrode and the counter electrode are installed sequentially in the corrosion chambers of the three sets of testing devices. The prepared corrosion solution is injected into the corrosion chamber. Wear load and wear frequency are set in the wear testing machine. The grinding ball (spherical Si3N4 ceramic ball) is moved downward through the wear testing machine to contact the sample, and a downward load is applied. The relative reciprocating sliding between the grinding ball and the sample achieves wear. Thus, the sample is subjected to the stress caused by the loading bolt, the corrosion caused by the environmental medium in the corrosion chamber, and the wear caused by the reciprocating sliding of the grinding ball, resulting in damage under the stress-wear-corrosion coupling effect.

[0065] Example 2

[0066] A quantitative evaluation method for a test device that realizes a stress-wear-corrosion coupled environment is provided. This embodiment is a test device and test method for the failure behavior of titanium-based composite material (laser additive manufacturing Ti6Al4V+2BN) under multi-factor coupling (stress-wear-corrosion). The test device includes a stress loading mechanism for stress loading the sample, a corrosion mechanism for electrochemical corrosion testing of the sample, and a wear mechanism for wear testing the sample.

[0067] In this embodiment, a constant load of 300 MPa was applied to the titanium alloy sample for 20 days; a wear load of 30 N was applied, with a wear frequency of 1 Hz and a sliding distance of 4 mm; the corrosive environment was 3.5 wt.% NaCl. The exposed area of ​​the sample was 6 mm². 2 The experiment lasted for 0.5 hours at room temperature. The experimental apparatus was assembled according to Example 1.

[0068] During the experiment, an electrochemical workstation was used to record the corrosion current i under the effects of corrosion, wear-corrosion coupling, and stress-wear-corrosion coupling. C i W+C i S+W+C Potentiodynamic polarization curves and corrosion current densities are as follows: Figure 3 As shown; after the test, the sample was removed from the corrosive environment, and the surface wear volume V0 and V2 were analyzed using a three-dimensional topology analyzer. W+C V S+W+C (like Figure 4 and Figure 5 ). will i C i W+C i S+W+C V0, V W+C V S+W+C K1(3.27×10 -3 mm·g·(μA·cm·yr) -1EW(11.98), ρ(4.89g·cm⁻¹) -3 Substitute these values ​​into the following formulas to quantitatively analyze the wear rate W0, corrosion rate C0, and the effect of corrosion on the wear rate ΔW. C The effect of wear on corrosion rate ΔC W The effect of stress on corrosion rate ΔC S The effect of stress on the wear rate ΔW S .

[0069]

[0070]

[0071]

[0072]

[0073]

[0074] ΔW C =T W+C -(W0+C0+ΔC W )=876584-(876508+0.20+50.55)=25.25μm·yr -1 ;

[0075] ΔT S =T S+W+C -T W+C =870884-876584=-5700μm·yr -1 ;

[0076]

[0077] ΔW S =ΔT S -ΔC S =-5700-109.29=-5809.29μm·yr -1 ;

[0078] The above results indicate that wear accelerates corrosion, and corrosion accelerates wear; stress accelerates corrosion, and stress inhibits wear.

[0079] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A quantitative evaluation method based on a testing device that realizes a stress-wear-corrosion coupled environment, the quantitative evaluation method being based on a stress, wear, and corrosion coupled effect test constructed by the testing device, characterized in that, The testing device includes a stress loading mechanism for applying stress to the sample, a corrosion mechanism for conducting electrochemical corrosion tests on the sample, and a wear mechanism for abrading the sample. The stress loading mechanism applies stress to the sample through spring deformation. The corrosion mechanism includes a corrosion chamber with an opening at the top to facilitate the addition of electrolyte and the reciprocating motion of the grinding balls in the wear mechanism. The wear mechanism abrades the sample using a friction and wear testing machine. The stress loading mechanism includes a support frame, screws, loading bolts, loading nuts, and a rectangular compression spring. The screws and loading bolts are provided with reserved grooves at the ends connected to the specimen. The specimen has reserved circular holes at both ends. The two ends of the specimen are inserted into the reserved grooves of the screws and loading bolts, respectively, and connected by pins. A rectangular compression spring is placed between the support frame and the loading nut. Different specifications of rectangular compression springs are selected for different applied stresses. The rectangular compression spring is deformed by tightening the loading nut. The friction and wear testing machine includes a grinding ball and a clamping mechanism. The grinding ball and clamping mechanism includes a grinding ball, a spring chuck, and a sleeve. The grinding ball is installed in the spring chuck, and the grinding ball is fixed by tightening the sleeve. The grinding ball contacts the sample and is driven by a servo motor to perform left and right reciprocating motion to wear the sample. The process of the experiment is as follows: Insulate both ends of the processed sample with insulating tape, then install it in the corrosion chamber. Before installation, place a pad under the sample and seal both ends of the sample with rubber plugs to prevent electrolyte leakage. Insert the reference electrode and counter electrode into the reserved holes on the side wall of the corrosion chamber, and then fix the screws and loading bolts to the support frame. Insert both ends of the sample into the reserved slots of the screws and loading bolts. Fix the rectangular compression spring and loading nut to the loading bolts in sequence. Install the pins, inserting the pins into the reserved circular holes of the screws and sample. The diameter of the circular holes is the same as the cylindrical diameter of the pins. Three sets of testing devices were set up, all operating on the same principle. The purpose of setting up three sets was to conduct a control experiment, which was carried out sequentially. The reference electrode and the counter electrode were installed in the corrosion chamber of each of the three testing devices in turn. The sample served as the working electrode, and the prepared corrosion solution was injected into the corrosion chamber. Wear load and wear frequency were set in the wear testing machine, and the grinding ball was moved downward through the wear testing machine to contact the sample, applying a downward load. The relative reciprocating sliding between the grinding ball and the sample achieved wear. Thus, the sample was subjected to the stress caused by the loading bolt, the corrosion caused by the environmental medium in the corrosion chamber, and the wear caused by the reciprocating sliding of the grinding ball, resulting in damage under the stress-wear-corrosion coupling effect. The quantitative evaluation method includes: (1) The total material loss rate during wear corrosion was calculated using a corrosion wear model. Wear rate without corrosion Corrosion rate without wear The effect of corrosion on wear rate The effect of wear on corrosion rate ; (2) Calculate the total loss rate of the material under the coupled stress-wear-corrosion action. The effect of stress on wear corrosion The effect of stress on corrosion The effect of stress on wear ; The wear-corrosion interaction in step (1) is expressed by the following formula: ； in, ; ； ； ； ； In the formula, V W+C The surface wear volume during corrosion wear, in mm. 3 V0 represents the surface wear volume during pure wear, in mm. 3 A represents the exposed area of ​​the sample in the corrosive solution, in mm. 2 t is the coupling time, in hours; K1 is a constant, 3.27 × 10⁻⁶. -3 mm•g•(μA•cm•yr) -1 i C The corrosion current during pure corrosion is expressed in μA•cm. 2 i W+C The corrosion current during corrosion wear is expressed in μA•cm. 2 EW is the equivalent mass of the sample, and ρ is the density of the sample, in g·cm³. -3 ; like This indicates that wear accelerates corrosion; if This indicates that wear has an inhibitory effect on corrosion; if This indicates that corrosion accelerates wear; if This indicates that corrosion has an inhibitory effect on wear; The stress-wear-corrosion interaction in step (2) is expressed by the following formula: ； In the formula, ; ； ； The effect of stress on wear corrosion It is further divided into the effect of stress on wear. The effect of stress on corrosion ; ； ； In the formula, V S+W+C The surface wear volume under stress-corrosion-wear coupling is expressed in mm. 3 ; The corrosion current under stress-corrosion-wear coupling is expressed in μA·cm. 2 ; like This indicates that stress accelerates corrosion. This indicates that stress has an inhibitory effect on corrosion; if This indicates that stress accelerates wear; if This indicates that stress has an inhibitory effect on wear.

2. The quantitative evaluation method based on a test device realizing a stress-wear-corrosion coupled environment as described in claim 1, characterized in that, The support frame is provided with hexagonal holes, and the screws and loading nuts are hexagonal in shape. During installation, the screws and loading bolts pass through the hexagonal holes to achieve a fixed connection between their ends and the two ends of the sample.

3. The quantitative evaluation method based on a test device realizing a stress-wear-corrosion coupled environment as described in claim 2, characterized in that, During the chemical corrosion test, except for the test surface, the other sample surfaces are insulated and sealed with the rubber plugs. Through holes are provided on both sides of the corrosion chamber, and the rubber plugs are placed in the through holes. The two ends of the sample pass through the rubber plugs, and the sample and the edge of the rubber plugs are sealed with sealant. The bottom of the corrosion chamber is provided with the pad to reduce the wear load on both ends of the corrosion chamber. The pad is made of non-conductive material.

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