CN112461910A - Method for testing transition potential of amorphous strip passive film by constant current method - Google Patents

Method for testing transition potential of amorphous strip passive film by constant current method Download PDF

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CN112461910A
CN112461910A CN202011077799.6A CN202011077799A CN112461910A CN 112461910 A CN112461910 A CN 112461910A CN 202011077799 A CN202011077799 A CN 202011077799A CN 112461910 A CN112461910 A CN 112461910A
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potential
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constant current
amorphous strip
transition
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CN112461910B (en
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王伟民
张昊
闫芝成
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Shandong University
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    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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Abstract

The invention relates to the technical field of amorphous strip passivation film transition potential, in particular to a method for testing the transition potential of an amorphous strip passivation film by using a constant current method, which comprises the following steps: placing the amorphous strip in a three-electrode workstation, testing a TAFEL curve to obtain a passivation platform, and selecting a potential value point from the passivation platform; and testing the selected potential value points according to a constant current method to obtain the transition potential of the amorphous strip. The invention enlarges the application field of the iron-based alloy and the amorphous material, can apply the amorphous to more practical production, plays a larger role of the amorphous alloy and has larger application prospect.

Description

Method for testing transition potential of amorphous strip passive film by constant current method
Technical Field
The invention relates to the technical field of testing the change of an amorphous strip passivation film, in particular to a method for testing the transition potential of the amorphous strip passivation film by using a constant current method.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
Amorphous alloys refer to metals and alloys in which the internal atomic arrangement is short-range ordered and long-range disordered, while having the characteristics of metals and glasses, and are also known as metallic glasses or glassy alloys. The amorphous alloy is considered to have good wear resistance and corrosion resistance due to the absence of defects in microstructure such as grain boundaries, uniformity of chemical composition, and absence of precipitates. The iron-based metal glass has the advantages of unique mechanical property, excellent soft magnetic property, excellent corrosion resistance and low cost. Nowadays, energy conservation and emission reduction are promoted in various industries in the world, and iron-based metal glass is widely applied as a green functional material, so that the corrosion resistance of the iron-based metal glass is more urgent to research.
The electrochemical test is used as a powerful tool for researching the corrosion resistance of the amorphous strip and is widely applied to detecting the passivation film of the strip. Amorphous strips with good corrosion resistance can show long passivation plateaus on the TAFEL curve, which is why passivation films are produced, but there are few ways to verify when passivation films are produced and when they are broken.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a method for testing the transition potential of an amorphous strip passivation film by using a constant current method.
To solve the above technical problem, one or more of the following embodiments of the present invention provide the following technical solutions:
a method for testing the transition potential of an amorphous strip passivation film by using a constant current method comprises the following steps:
placing the amorphous strip in a three-electrode workstation, testing a TAFEL curve to obtain a passivation platform, and selecting a potential value point from the passivation platform;
and testing the selected potential value points according to a constant current method to obtain the transition potential of the amorphous strip.
Compared with the prior art, one or more technical schemes of the invention have the following beneficial effects:
(1) the method of the invention can detect when the amorphous strip is generated and when the passivation film is damaged, namely the transition potential.
(2) The conversion potential of the amorphous alloy is found, the constant current of the amorphous alloy can be treated to the maximum corrosion resistance degree, the service life of the amorphous alloy is prolonged, the application fields of the iron-based alloy and the amorphous material are further expanded, the amorphous alloy can be applied to more practical production, the larger effect of the amorphous alloy is exerted, and the amorphous alloy has a larger application prospect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 shows Fe prepared in example 1 of the present invention87-xB13Nbx(a) x ═ 0, (b) x ═ 7, and (c) x ═ 10) band fracture micrographs.
FIG. 2 shows Fe prepared in example 1 of the present invention87-xB13Nbx(x ═ 0,7, and 10) potentiodynamic polarization profiles of amorphous strips in degassed alkaline solutions.
FIG. 3 shows Fe in example 1 of the present invention87-xB13Nbx(x ═ 0,7, and 10) graphs of amorphous strips tested by the galvanostatic method; wherein the left side is a constant potential diagram and the right side is an open circuit potential diagram.
FIG. 4 is an analysis of the data of FIG. 3 in example 1 of the present invention; wherein (a) and (b) are constant potential initial value and ending value respectively, (c) and (d) are open circuit potential initial value and ending value respectively, (E) is difference value of constant potential initial value and ending value, (f) is difference value of open circuit potential initial value and ending value, and arrow represents transition potential Etrans。
FIG. 5 shows Fe in example 1 of the present invention87-xB13Nbx(x ═ 0 and 7) micrographs of amorphous bands before and after the potential transition after galvanostatic testing; wherein (a) is x-0 before the transition, (b) is x-0 after the transition, (c) is x-7 before the transition, and (d) is x-7 after the transition.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
A method for testing the transition potential of an amorphous strip passivation film by using a constant current method comprises the following steps:
placing the amorphous strip in a three-electrode workstation, testing a TAFEL curve to obtain a passivation platform, and selecting a potential value point from the passivation platform;
and testing the selected potential value points according to a constant current method to obtain the transition potential of the amorphous strip.
In some embodiments, the number of potential points is 5-9, and further 7. The selection principle of potential value points is as follows: potential value points are selected on the passivation platform according to the TAFEL curve, and one point is selected every 0.1V from the beginning to the end of the passivation platform.
In some embodiments, each potential value point corresponds to the test of 600-.
In some embodiments, the test temperature is 20-35 ℃.
In some embodiments, after the transition potential is tested, a step of performing a microtopography analysis is further included.
In some embodiments, the amorphous ribbon is an iron-based amorphous ribbon.
Further, the iron-based amorphous strip is Fe87-xB13Nbx(x ═ 0,7, and 10).
Further, the Fe-based amorphous strip is Fe87-xB13NbxThe potential value point of (x ═ 0,7 and 10) was-0.6VSCE、-0.5VSCE、-0.4VSCE、-0.3VSCE、-0.2VSCE、-0.1VSCEAnd 0VSCE。
The invention will now be further described with reference to the accompanying drawings and detailed description.
In the following examples, types of furnaces: vacuum melting furnace (Ebmund Buehler, MAM-1). Copper roller melt-spun machine type: vacuum melt-spun machine (SKY, SD 500). Electrochemical workstation type: three electrode workstation (CHI 660E).
Example 1
A method for obtaining a transition potential by a constant current method, comprising the steps of:
step 1, weighing pure iron (>99.5 wt.%), Fe-B and Fe-Nb according to corresponding atomic ratios, mixing, and putting into a resistance furnace for melting.
Step 2, adding Fe87-xB13NbxThree kinds of (x is 0,7 and 10) alloy ingots are respectively placed in a quartz tube and heated and melted in an induction coil, and the molten alloy ingots are melted into liquid Fe when the rotating speed of a copper roller is 4000r/min87-xB13Nbx(x ═ 0,7, and 10) alloy was sprayed onto a copper roll, thereby obtaining Fe87-xB13Nbx(x ═ 0,7, and 10) three amorphous stripes.
And 3, placing the strip in a three-electrode workstation to test the TAFEL curve to obtain a passivation platform, and selecting potential value points from the passivation platform.
And 4, testing according to the selected potential value points by a constant current method, wherein each point corresponds to 600-second constant potential and 400-second open-circuit potential, and further conversion potential is obtained.
And 5, selecting points before and after the potential is changed, testing by a constant current method, and then carrying out microscopic morphology analysis.
Example 2
A method for obtaining a transition potential by a constant current method, comprising the steps of:
step 1, weighing pure iron (>99.5 wt.%), Fe-B and Fe-Nb according to corresponding atomic ratios, mixing, and putting into a resistance furnace for melting.
Step 2, adding Fe87-xB13NbxThree kinds of (x is 0,7 and 10) alloy ingots are respectively placed in a quartz tube and heated and melted in an induction coil, and the melted alloy ingots are melted into liquid Fe when the rotating speed of a copper roller is 3800r/min87-xB13Nbx(x ═ 0,7, and 10) alloy was sprayed onto a copper roll, thereby obtaining Fe87-xB13Nbx(x ═ 0,7, and 10) three amorphous stripes.
And 3, placing the strip in a three-electrode workstation to test the TAFEL curve to obtain a passivation platform, and selecting potential value points from the passivation platform.
And 4, testing according to the selected potential value points by a constant current method, wherein each point corresponds to 600-second constant potential and 400-second open-circuit potential, and further conversion potential is obtained.
And 5, selecting points before and after the potential is changed, testing by a constant current method, and then carrying out microscopic morphology analysis.
Example 3
A method for obtaining a transition potential by a constant current method, comprising the steps of:
step 1, weighing pure iron (>99.5 wt.%), Fe-B and Fe-Nb according to corresponding atomic ratios, mixing, and putting into a resistance furnace for melting.
Step 2, adding Fe87-xB13NbxThree kinds of (x is 0,7 and 10) alloy ingots are respectively placed in a quartz tube and heated and melted in an induction coil, and when the rotating speed of a copper roller is 3600r/min, the three kinds of alloy ingots are melted into liquid Fe87-xB13Nbx(x ═ 0,7, and 10) alloy was sprayed onto a copper roll, thereby obtaining Fe87-xB13Nbx(x ═ 0,7, and 10) three amorphous stripes.
And 3, placing the strip in a three-electrode workstation to test the TAFEL curve to obtain a passivation platform, and selecting potential value points from the passivation platform.
And 4, testing according to the selected potential value points by a constant current method, wherein each point corresponds to 600-second constant potential and 400-second open-circuit potential, and further conversion potential is obtained.
And 5, selecting points before and after the potential is changed, testing by a constant current method, and then carrying out microscopic morphology analysis.
And (3) performance testing:
the results of the observation and testing of the respective products prepared in example 1 are shown in FIGS. 1-5, in which:
FIG. 1 is Fe prepared87-xB13Nbx(a) x ═ 0, (b) x ═ 7, and (c) x ═ 10) band fracture micrographs, as can be seen: all three strips are ductile fractures and belong to amorphous strips.
FIG. 2 shows Fe prepared87-xB13Nbx(x ═ 0,7, and 10) potentiodynamic polarization plots of amorphous bands in degassed alkaline solutions, as can be seen from the plots: all three strips have long passivation platforms and good corrosion resistance.
FIG. 3 is Fe87-xB13Nbx(x is 0,7 and 10) a graph of the amorphous strip tested by a constant potential-open circuit potential method; wherein, the left side is a constant potential diagram, and the right side is an open-circuit potential diagram, and the diagram shows that: the curve of constant potential and open circuit potential of the strip with x being 0 is-0.6VSCEand-0.5-0VSCEThe obvious difference is that the constant potential and open circuit potential curve of the strip with x being 7 is between-0.6 and-0.5VSCEand-0.4-0VSCEThe obvious difference is that the constant potential and open circuit potential curve of the strip with x being 10 is between-0.6 and-0.4VSCEand-0.3-0VSCEThere are obvious differences.
FIG. 4 is an analysis of the data of FIG. 3; wherein (a) and (b) are constant potential initial value and ending value respectively, (c) and (d) are open circuit potential initial value and ending value respectively, (E) is difference value of constant potential initial value and ending value, (f) is difference value of open circuit potential initial value and ending value, and arrow represents transition potential EtransAs can be seen from the figure: the band transition potential of x-0 occurs at-0.6VSCEand-0.5VSCEThe band transition potential of x-7 between is-0.5VSCEand-0.4VSCEIn between, the band transition potential of x-10 appears at-0.4VSCEand-0.3VSCEThere between.
FIG. 5 is Fe87-xB13Nbx(x ═ 0 and 7) constant potential-open circuit potential method of amorphous bands before and after potential transitionA post-test microscopic topography; where (a) is the x-0 strip before the transition, (b) is the x-0 strip after the transition, (c) is the x-7 strip before the transition, (d) is the x-7 strip after the transition, as can be seen from the figure: the surface of the strip with x being 0 and 7 is smooth before the potential is converted, obvious pitting pits appear after the potential is converted, and the reliability of the conversion potential is further proved by testing the amorphous strip by a constant current method.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for testing the transition potential of an amorphous strip passivation film by using a constant current method is characterized in that: the method comprises the following steps:
placing the amorphous strip in a three-electrode workstation, testing a TAFEL curve to obtain a passivation platform, and selecting a potential value point from the passivation platform;
and testing the selected potential value points according to a constant current method to obtain the transition potential of the amorphous strip.
2. The method for testing the transition potential of the amorphous strip passivation film by the constant current method according to claim 1, wherein: the number of potential points is 5-9.
3. The method for testing the transition potential of the amorphous strip passivation film by the constant current method according to claim 2, wherein: the number of potential points is 7.
4. The method for testing the transition potential of the amorphous strip passivation film by the constant current method according to claim 1, wherein: and testing 600-1200 second constant potential and 400-1000 second open circuit potential at each potential value point correspondingly to obtain the transition potential.
5. The method for testing the transition potential of the amorphous strip passivation film by the constant current method according to claim 4, wherein: and correspondingly testing the constant potential for 600 seconds and the open-circuit potential for 400 seconds at each potential value point to further obtain the conversion potential.
6. The method for testing the transition potential of the amorphous strip passivation film by the constant current method according to claim 1, wherein: the test temperature was 20-35 ℃.
7. The method for testing the transition potential of the amorphous strip passivation film by the constant current method according to claim 1, wherein: after the transformation potential is tested, the method also comprises the step of carrying out microscopic morphology analysis.
8. The method for testing the transition potential of the amorphous strip passivation film by the constant current method according to claim 1, wherein: the amorphous strip is an iron-based amorphous strip.
9. The method for testing the transition potential of the amorphous strip passivation film by the constant current method according to claim 8, wherein: the iron-based amorphous strip is Fe87-xB13NbxAnd x is 0,7 or 10.
10. The method for testing the transition potential of the amorphous strip passivation film by the constant current method according to claim 9, wherein: the iron-based amorphous strip is Fe87-xB13NbxX is 0,7 or 10, and the potential point is-0.6VSCE、-0.5VSCE、-0.4VSCE、-0.3VSCE、-0.2VSCE、-0.1VSCEAnd 0VSCE。
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102243205A (en) * 2011-04-25 2011-11-16 河南科技大学 Method for rapidly measuring corrosion result of aluminum anode alloy
CN107607606A (en) * 2017-08-09 2018-01-19 东北石油大学 The structural steel trade mark sorts electrochemical method and device
CN110361428A (en) * 2019-08-27 2019-10-22 国网重庆市电力公司电力科学研究院 A kind of characterizing method of anodic coating steel strand wires etch state
CN110541129A (en) * 2019-04-12 2019-12-06 中国科学院金属研究所 method for improving pitting corrosion resistance of aluminum-based amorphous alloy by adopting low-concentration corrosion inhibitor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102243205A (en) * 2011-04-25 2011-11-16 河南科技大学 Method for rapidly measuring corrosion result of aluminum anode alloy
CN107607606A (en) * 2017-08-09 2018-01-19 东北石油大学 The structural steel trade mark sorts electrochemical method and device
CN110541129A (en) * 2019-04-12 2019-12-06 中国科学院金属研究所 method for improving pitting corrosion resistance of aluminum-based amorphous alloy by adopting low-concentration corrosion inhibitor
CN110361428A (en) * 2019-08-27 2019-10-22 国网重庆市电力公司电力科学研究院 A kind of characterizing method of anodic coating steel strand wires etch state

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