Method for improving corrosion and wear resistance of stainless steel foil strip

Abstract

The invention discloses a method for improving corrosion and wear resistance of a stainless steel foil strip, and belongs to the technical field of metal material surface treatment. The method for improving the corrosion and wear resistance of the stainless steel foil strip comprises the following steps: preparing a micro-nano structure on the surface of the stainless steel foil strip by using a texturing roller, and then carrying out composite micro-rolling by using a flat roller to obtain the corrosion and wear resistant stainless steel foil strip. The texturing roller and the flat roller are used for preparing the micro-nano structure on the surface of the stainless steel foil strip, so that the strength and the hardness are improved, the roughness is reduced, and the corrosion and wear resistance is improved while the thickness of the stainless steel foil strip is not changed (so that the stainless steel foil strip has the advantages of wear resistance of the micro-nano structure and fine grain strengthening corrosion resistance).

Description

Technical Field

[0001] This invention relates to the field of surface treatment technology for metal materials, and in particular to a method for improving the corrosion and wear resistance of stainless steel foil strips. Background Technology

[0002] Stainless steel foil strips possess excellent corrosion resistance, thermal stability, and comprehensive mechanical properties, making them widely used in the manufacture of micro-components for micro-electromechanical systems (MEMS), medical devices, and other applications. However, when precision components made from stainless steel thin foil strips are used in aerospace and other fields, they are susceptible to wear and corrosion failure due to varying service conditions. Surface defects such as scratches and pitting can easily appear, reducing service life.

[0003] Domestic and foreign researchers have carried out a lot of work on preparing micro and nano structures on the surface of materials to improve the corrosion and wear resistance of materials. There are five main preparation methods: (1) Photolithography (including photocopying and photoetching). This method can accurately transform and transfer image information to thin layers, but it is difficult to introduce large fine grains and work hardening on the surface of materials. It is generally used in the manufacturing of integrated circuits. Its effect on improving the corrosion and wear resistance of stainless steel foil is limited. Moreover, the preparation process is complicated and the cost is high; (2) Laser processing technology can prepare high-precision micro and nano composite structures with complex structures on the surface of materials. It is currently the most widely used surface micro and nano structure processing technology. However, the thermal effect of laser processing may cause lattice thermal damage. When applied to metal foil, it is easy to cause defects on the surface or even the risk of penetration; (3) Self-assembly method is a top-down surface micro and nano structure fabrication technology. The mechanical strength of the surface micro and nano structures formed by this technology is not high. High, but easily damaged by corrosion and wear, affecting its internal integrity, and the preparation time is long and the area is small, making it unsuitable for large-scale application on stainless steel foil strips; (4) Deposition method (vapor deposition and electrochemical deposition), this method uses the physicochemical changes of the gas phase to prepare micro-nano structures on the material surface, which can form a protective coating on the surface of stainless steel materials, significantly improving corrosion resistance. However, in the service environment of corrosion and wear coupling, the bond between the deposited layer and the substrate is prone to peeling and failure, and the deposition cost is high and the deposition speed is slow, which limits its large-scale application; (5) Additive manufacturing method (3D printing method), this method is simple, flexible and high precision in manufacturing surface micro-nano structures, especially suitable for small-batch production of complex surfaces. However, due to the thermal cycle in its layer-by-layer manufacturing process, the residual stress generated inside the part can cause the part to deform or crack, making it unsuitable for preparation on stainless steel foil strips. Therefore, how to simplify the micro-nano structure preparation method, improve its strength and hardness while maintaining the precision of the micro-nano structure, reduce defects, and ensure that stainless steel foil strips continue to play a role in the service environment of corrosion and wear has become a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a method for improving the corrosion and wear resistance of stainless steel foil strips, so as to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following solution: One of the technical solutions of the present invention: a method for improving the corrosion and wear resistance of stainless steel foil strip, comprising the following steps: Micro-nano structures are prepared on the surface of stainless steel foil using a texturing roller, and then composite micro-rolling is performed using a flat roller to obtain the corrosion-resistant and wear-resistant stainless steel foil.

[0006] Furthermore, the thickness of the stainless steel foil strip ranges from 20 to 500 μm.

[0007] Furthermore, the texturing roller is made using laser texturing technology, and its surface is uniformly distributed with arc-shaped (fish-scale-like) micro-nano structures with a roughness (Sa) of 0.38~0.42μm; The roughness of the flat roller is ≤0.03μm.

[0008] Furthermore, the rolling pressure for preparing micro-nano structures on the surface of stainless steel foil strip is 5kN, the rolling speed is 0.5m / s, and the thickness ratio of the stainless steel foil strip before and after rolling is 1:1.

[0009] Furthermore, the composite micro-rolling has a lower pressure of 5kN, a rolling speed of 0.5m / s, and a thickness ratio of 1:1 for the stainless steel foil strip before and after rolling.

[0010] The second technical solution of the present invention: a corrosion-resistant and wear-resistant stainless steel foil strip prepared by the above method.

[0011] The present invention discloses the following technical effects: (1) The present invention uses a texturing roller and a flat roller to prepare micro-nano structures on the surface of stainless steel foil, thereby improving the strength and hardness of stainless steel foil, reducing roughness, and improving corrosion and wear resistance without changing the thickness of stainless steel foil (making stainless steel foil have both the wear resistance of micro-nano structures and the advantages of fine grain strengthening corrosion resistance).

[0012] (2) The method of the present invention is a cold rolling work hardening method. This method does not produce obvious plastic deformation. Therefore, the plasticity and toughness of the stainless steel foil strip will not decrease. It can improve the service performance of stainless steel precision foil strip in a corrosive and wear environment, and provide key theoretical and technical support for further improving the long-term continuous service performance of stainless steel precision foil strip under the coupled effect of corrosion and wear. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the textured roller used in Example 1; Figure 2 The surface roughness of stainless steel precision foil strip (U), corrosion-resistant and wear-resistant stainless steel foil strip (U1) prepared in Comparative Example 1, corrosion-resistant and wear-resistant stainless steel foil strip (U2) prepared in Comparative Example 2 and corrosion-resistant and wear-resistant stainless steel foil strip (U3) prepared in Example 1, wherein (a) is surface roughness Sa and (b) is surface roughness Sz. Figure 3 Comparative graphs of the performance of stainless steel precision foil strip (U), corrosion-resistant and wear-resistant stainless steel foil strip (U1) prepared in Comparative Example 1, corrosion-resistant and wear-resistant stainless steel foil strip (U2) prepared in Comparative Example 2 and corrosion-resistant and wear-resistant stainless steel foil strip (U3) prepared in Example 1, wherein (a) is a comparison graph of dry friction coefficient, (b) is a comparison graph of corrosion and wear friction coefficient, and (c) is a comparison graph of open circuit voltage. Figure 4 Microscopic images of the surface microstructure of stainless steel precision foil strip (U), corrosion-resistant and wear-resistant stainless steel foil strip (U1) prepared in Comparative Example 1, corrosion-resistant and wear-resistant stainless steel foil strip (U2) prepared in Comparative Example 2, and corrosion-resistant and wear-resistant stainless steel foil strip (U3) prepared in Example 1, wherein (a), (e) and (i) are stainless steel precision foil strip (U), (b), (f) and (j) are corrosion-resistant and wear-resistant stainless steel foil strip (U1), (c), (g) and (k) are corrosion-resistant and wear-resistant stainless steel foil strip (U2), and (d), (h) and (l) are corrosion-resistant and wear-resistant stainless steel foil strip (U3); Figure 5 The hardness comparison charts are of stainless steel precision foil strip (U), corrosion-resistant wear-resistant stainless steel foil strip (U1) prepared in Comparative Example 1, corrosion-resistant wear-resistant stainless steel foil strip (U2) prepared in Comparative Example 2, and corrosion-resistant wear-resistant stainless steel foil strip (U3) prepared in Example 1. Among them, (a) is the nano-indentation loading and unloading displacement curve, and (b) is the nano-hardness histogram. Detailed Implementation

[0015] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0016] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0017] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0018] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be apparent to those skilled in the art. This specification and embodiments are merely exemplary.

[0019] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0020] Example 1 A method for improving the corrosion and wear resistance of stainless steel foil strips: (1) Micro-nano structures were prepared on the surface of 301 stainless steel precision foil strip (U) with a thickness of 20μm by micro-rolling using a textured roller (the textured roller has a uniformly distributed arc-shaped (fish scale-like) micro-nano structure with Sa=0.4μm on its micro-surface). The rolling pressure was 5kN, the rolling speed was 0.5m / s, the surface roughness of the foil strip after a single pass of rolling was 0.1μm, and the thickness of the foil strip after rolling was 20μm.

[0021] A schematic diagram of the textured roller (i.e., the texturing roller) can be found here. Figure 1 .

[0022] (2) The stainless steel precision foil strip that has been micro-rolled by the textured roller is then micro-rolled by the flat roller (the roughness of the flat roller is 0.03μm). The pressure is 5kN and the rolling speed is 0.5m / s. After a single pass of rolling, the surface roughness of the foil strip is reduced to about 0.04μm and the thickness of the foil strip after rolling is 20μm, thus obtaining the corrosion-resistant and wear-resistant stainless steel foil strip (U3).

[0023] Comparative Example 1 A method for improving the corrosion and wear resistance of stainless steel foil strips: The surface of a 20μm thick 301 stainless steel precision foil strip was micro-rolled using a flat roll (with a surface roughness of 0.03μm). The rolling pressure was 5kN and the rolling speed was 0.5m / s. After a single pass of rolling, the surface roughness of the foil strip was approximately 0.04μm, and the thickness of the foil strip after rolling was 20μm, resulting in a corrosion-resistant and wear-resistant stainless steel foil strip (U1).

[0024] Comparative Example 2 A method for improving the corrosion and wear resistance of stainless steel foil strips: Micro-nano structures were fabricated on the surface of a 20μm thick 301 stainless steel precision foil strip using a texturing roller (the texturing roller has a uniformly distributed arc-shaped (fish-scale-like) micro-nano structure with Sa=0.4μm on its micro-surface). The rolling pressure was 5kN, the rolling speed was 0.5m / s, the surface roughness of the foil strip after a single pass was 0.1μm, and the thickness of the foil strip after rolling was 20μm, resulting in a corrosion-resistant and wear-resistant stainless steel foil strip (U2).

[0025] Example 1 The surface roughness of the stainless steel precision foil strip (U), the corrosion-resistant and wear-resistant stainless steel foil strip prepared in Comparative Example 1 (U1), the corrosion-resistant and wear-resistant stainless steel foil strip prepared in Comparative Example 2 (U2), and the corrosion-resistant and wear-resistant stainless steel foil strip prepared in Example 1 (U3) are shown in the figure. Figure 2 , Figure 2 In the figure, (a) represents the surface roughness Sa, and (b) represents the surface roughness Sz.

[0026] from Figure 2 As can be seen, after micro-rolling with flat rolls, the surface roughness of stainless steel foil strips increases slightly; after micro-rolling with textured rolls, the surface roughness of stainless steel foil strips increases significantly; after micro-rolling with a combination of flat rolls and textured rolls, the surface roughness of stainless steel foil strips decreases compared to micro-rolling with textured rolls.

[0027] Example 2 (1) Stainless steel precision foil strip (U), corrosion-resistant wear-resistant stainless steel foil strip prepared in Comparative Example 1 (U1), corrosion-resistant wear-resistant stainless steel foil strip prepared in Comparative Example 2 (U2), and corrosion-resistant wear-resistant stainless steel foil strip prepared in Example 1 (U3) were respectively placed on an MFT-5000 friction and wear testing machine for dry friction. The dry friction was carried out in a dry room temperature environment, with a downward pressure of 13N, a friction pair of 6.36mm GCr15 steel balls, a stroke of 5mm, and a test time of 1min. The experimental results are shown in the figure. Figure 3 Figure (a)

[0028] from Figure 3 As can be seen in Figure (a), the stable friction coefficient of the corrosion-resistant and wear-resistant stainless steel foil strip (U3) after composite micro-rolling is 0.3, which is 48.3% lower than that of the original stainless steel precision foil strip (U).

[0029] (2) The stainless steel precision foil strip (U), the corrosion-resistant stainless steel foil strip prepared in Comparative Example 1 (U1), the corrosion-resistant stainless steel foil strip prepared in Comparative Example 2 (U2), and the corrosion-resistant stainless steel foil strip prepared in Example 1 (U3) were respectively placed in a 1% wt NaCl solution, and then corrosion wear experiments were carried out on an MFT-5000 tribometer. A Princeton Versa STAT 3F electrochemical workstation was used, with an Ag / AgCl electrode as the reference electrode and a Pt electrode as the auxiliary electrode. The open circuit potential was measured for 30 min. The experimental results are shown in the figure. Figure 3 Figure (c) shows the results of a friction experiment. A downward pressure of 5 N was applied, the grinding pair consisted of Al2O3 ceramic balls, the stroke was 5 mm, and the test time was 3 min. The experimental results are shown in [Figure c]. Figure 3 (b) of the diagram.

[0030] from Figure 3 As can be seen in Figure (b), the stable friction coefficient of the corrosion-resistant stainless steel foil strip (U3) after composite micro-rolling is 0.4, which is 38.4% lower than that of the original stainless steel precision foil strip (U). Moreover, the surface micro-nano structure still exists after corrosion and wear, with fewer pits and shallow wear grooves.

[0031] from Figure 3 As can be seen in Figure (c), the open circuit potential of the corrosion-resistant wear-resistant stainless steel foil strip (U3) after composite micro-rolling remains relatively high before and during wear, and the corrosion tendency is the lowest.

[0032] Example 3 Microscopic images (without abrasion) of the surface microstructure of stainless steel precision foil strip (U), corrosion-resistant and wear-resistant stainless steel foil strip prepared in Comparative Example 1 (U1), corrosion-resistant and wear-resistant stainless steel foil strip prepared in Comparative Example 2 (U2), and corrosion-resistant and wear-resistant stainless steel foil strip prepared in Example 1 (U3) are shown below. Figure 4 . Figure 4 In the images, (a), (e), and (i) are microscopic images of stainless steel precision foil strip (U); (b), (f), and (j) are microscopic images of corrosion-resistant and wear-resistant stainless steel foil strip (U1); (c), (g), and (k) are microscopic images of corrosion-resistant and wear-resistant stainless steel foil strip (U2); and (d), (h), and (l) are microscopic images of corrosion-resistant and wear-resistant stainless steel foil strip (U3).

[0033] from Figure 4As can be seen, after micro-rolling with flat rolls (U1), fine peaks and valleys appear on the surface of the stainless steel foil strip along the rolling direction; after micro-rolling with textured rolls (U2), a fish-scale-like micro-nano structure is constructed on the surface of the stainless steel foil strip; after micro-rolling with a combination of flat rolls and textured rolls (U3), the peaks and valleys of the micro-nano structure on the surface of the stainless steel foil strip become shallower.

[0034] Example of effect 4 A hardness comparison chart of stainless steel precision foil strip (U), corrosion-resistant and wear-resistant stainless steel foil strip prepared in Comparative Example 1 (U1), corrosion-resistant and wear-resistant stainless steel foil strip prepared in Comparative Example 2 (U2), and corrosion-resistant and wear-resistant stainless steel foil strip prepared in Example 1 (U3) is shown in the figure. Figure 5 Among them, (a) is the nanoindentation loading and unloading displacement curve, and (b) is the nanohardness histogram.

[0035] from Figure 5 As can be seen from the data, the corrosion-resistant and wear-resistant stainless steel foil strip (U3) prepared in Example 1 has the highest hardness.

[0036] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for improving the corrosion and wear resistance of stainless steel foil strips, characterized in that, Includes the following steps: Micro-nano structures are prepared on the surface of stainless steel foil using a texturing roller, and then composite micro-rolling is performed using a flat roller to obtain the corrosion-resistant and wear-resistant stainless steel foil.

2. The method according to claim 1, characterized in that, The surface of the textured roller is uniformly distributed with arc-shaped micro / nano structures with a roughness of 0.38~0.42 μm; The roughness of the flat roller is ≤0.03 μm.

3. The method according to claim 1, characterized in that, The rolling pressure for preparing micro-nano structures on the surface of stainless steel foil strip is 5 kN, the rolling speed is 0.5 m / s, and the thickness ratio of the stainless steel foil strip before and after rolling is 1:

1. The composite micro-rolling process involves a downward pressure of 5 kN, a rolling speed of 0.5 m / s, and a thickness ratio of 1:1 between the stainless steel foil strip before and after rolling.

4. A corrosion-resistant and wear-resistant stainless steel foil strip prepared by the method according to any one of claims 1 to 3.

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