CN113777013A - Corrosion resistance test sample piece and method for testing corrosion resistance of zinc-aluminum-magnesium coated steel - Google Patents

Corrosion resistance test sample piece and method for testing corrosion resistance of zinc-aluminum-magnesium coated steel Download PDF

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CN113777013A
CN113777013A CN202110699352.0A CN202110699352A CN113777013A CN 113777013 A CN113777013 A CN 113777013A CN 202110699352 A CN202110699352 A CN 202110699352A CN 113777013 A CN113777013 A CN 113777013A
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sample wafer
corrosion resistance
fluorocarbon
corrosion
edge sealing
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CN113777013B (en
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陈一鸣
胡宽辉
王俊霖
孙伟华
祝洪川
阎元媛
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Wuhan Iron and Steel Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/006Investigating resistance of materials to the weather, to corrosion, or to light of metals
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q

Abstract

The invention particularly relates to a corrosion resistance test sample wafer and a method for testing the corrosion resistance of zinc-aluminum-magnesium coated steel, belonging to the technical field of corrosion tests of steel materials, wherein the sample wafer comprises a sample wafer body and an edge sealing layer, the sample wafer body comprises a test area and a sealing area, the sealing area is annularly arranged in the test area, the edge sealing layer is coated on the sealing area, and the edge sealing layer comprises the following components: fluorocarbon metal paint and fluorocarbon metal paint curing agent; the sample wafer is subjected to edge sealing by the fluorocarbon metallic paint, the excellent characteristics of weather resistance and acid and alkali resistance of the sample wafer are utilized, the sample wafer is ensured to have good edge sealing in the whole corrosion test (salt spray test) period, the influence of notch corrosion on the test result is eliminated, the liquid surface horizontal characteristic of the fluorocarbon metallic paint is utilized, and the accurate calculation of the exposed area of the corrosion test coating is ensured by the alignment of the sample wafer marked lines.

Description

Corrosion resistance test sample piece and method for testing corrosion resistance of zinc-aluminum-magnesium coated steel
Technical Field
The invention belongs to the technical field of corrosion tests of steel materials, and particularly relates to a corrosion resistance test sample and a method for testing the corrosion resistance of zinc-aluminum-magnesium coated steel.
Background
The zinc-aluminum-magnesium coating is a novel metal material surface anti-corrosion material, has super-strong corrosion resistance, can adapt to various severe environments, and is further improved in corrosion resistance compared with the traditional pure zinc and aluminum-zinc coatings. At present, a steel plate adopting a zinc-aluminum-magnesium coating is widely applied to industries such as household appliances, buildings and the like.
In the process of designing and popularizing a coated steel plate product, a verification test needs to be carried out on the corrosion resistance of the coated steel plate, for example, the corrosion process of a coating is accelerated through a laboratory salt spray test or an outdoor exposure test, and then the corrosion resistance of the coating is represented through various measuring methods, wherein the most common measuring method is a gravimetric method. The method comprises the following steps of measuring the corrosion rate of a coating by a gravimetric method, comparing the weight change of a coated steel plate before and after corrosion after the coated steel plate is subjected to the action of a corrosion medium for a certain time under a certain environmental condition (such as a salt spray test), and determining the corrosion speed by the following formula:
Figure RE-GDA0003354006210000011
in the formula:
k- -corrosion rate, g/m2Hour(s)
S- -area of sample, rice2
T- -test time, hours
W0Weight of the sample piece before the test, g
W- -weight of sample piece after test, g (after removal of corrosion products)
Compared with other measuring methods, the gravimetric method has the advantages of being direct, visual, strong in anti-interference performance and the like, and can accurately measure the corrosion rate of the plating layer. The key points of the gravimetric method for measuring the corrosion resistance of the coating are eliminating the interference of edge cuts, measuring the exposed area of the coating and removing the corrosion products of the coating.
Currently, conventional solutions employ aluminum foil edge seals, manually measure the exposed area of the plating, and then clean the corrosion products with chemical reagents.
Disclosure of Invention
The applicant finds in the course of the invention that: the zinc-aluminum-magnesium plating layer has good corrosion resistance, and the test period is long through a salt spray test or an outdoor exposure test. The conventional aluminum foil edge sealing is easy to cause that the edge sealing is not tight or falls off, the measurement of the exposed area of the plating layer is not accurate, and the test result is easy to be interfered when the corrosion rate of the plating layer is measured by a gravimetric method. Meanwhile, due to the existence of magnesium element in the zinc-aluminum-magnesium coating, the corrosion product is different from that of the conventional pure zinc and aluminum-zinc coating, and the conventional chemical reagent is used for cleaning, so that the incomplete removal of the corrosion product is easily caused, and the interference on the test result is caused.
The invention aims to provide a corrosion resistance test sample piece and a method for testing the corrosion resistance of zinc-aluminum-magnesium coated steel, so as to solve the problems that the edge sealing is not tight or falls off and the measurement of the exposed area of a coating is inaccurate due to the fact that aluminum foil is adopted for edge sealing at present.
The embodiment of the invention provides a corrosion resistance test sample wafer, which comprises a sample wafer body and an edge sealing layer, wherein the sample wafer body comprises a test area and a sealing area, the sealing area is annularly arranged in the test area, the edge sealing layer is coated on the sealing area, and the edge sealing layer comprises the following components: fluorocarbon metallic paint and fluorocarbon metallic paint curing agent.
Optionally, the edge sealing layer includes a first edge sealing layer and a second edge sealing layer arranged from inside to outside; the first edge sealing layer comprises the following components: fluorocarbon metal primer and fluorocarbon metal primer curing agent; the second edge sealing layer comprises the following components: fluorocarbon metal finish paint and fluorocarbon metal finish paint curing agent.
Optionally, the ratio of the fluorocarbon metal primer to the fluorocarbon metal primer curing agent is 9-11 by volume: 1.
optionally, the ratio of the fluorocarbon metal finish paint to the fluorocarbon metal finish paint curing agent is 4-6: 1.
based on the same invention concept, the embodiment of the invention also provides a method for testing the corrosion resistance of the zinc-aluminum-magnesium coated steel, which comprises the following steps:
obtaining a sample wafer body, wherein the sample wafer body is made of zinc-aluminum-magnesium coated steel;
pre-dividing the sample wafer body into a test area and a sealing area to obtain the area of the test area;
coating the edge sealing layer on the sealing area of the sample wafer body to obtain the corrosion resistance test sample wafer;
and carrying out corrosion resistance test on the corrosion resistance test sample wafer to obtain the corrosion speed of the plating layer.
Optionally, the corrosion resistance test includes: cleaning corrosion products, wherein the cleaning corrosion products specifically comprise:
immersing the corrosion resistance test sample wafer subjected to the corrosion test into a first solution, wherein the effective component of the first solution comprises glycine;
and immersing the corrosion resistance test sample wafer soaked in the first solution into a second solution, wherein the effective components of the second solution comprise chromium trioxide and silver nitrate.
Optionally, 200g to 250g of glycine is dissolved in 1L of the first solution.
Optionally, in the second solution, 150g to 200g of chromium trioxide and 10g to 20g of silver nitrate are dissolved per 1L of the solvent.
Optionally, coating the edge sealing layer on the sealing area of the sample wafer body to obtain the corrosion resistance test sample wafer as described above, specifically including:
coating the first edge sealing layer on the sealing area of the sample wafer body;
and coating a second edge sealing layer on the first edge sealing layer.
Optionally, the composition of the first edge sealing layer includes: the fluorocarbon metal primer and the fluorocarbon metal primer curing agent are mixed according to the proportion of 9-11: 1; the second edge sealing layer comprises the following components: the fluorocarbon metal finish paint comprises fluorocarbon metal finish paint and a fluorocarbon metal finish paint curing agent, wherein the proportion of the fluorocarbon metal finish paint to the fluorocarbon metal finish paint curing agent is 4-6: 1.
one or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the corrosion resistance test sample wafer provided by the embodiment of the invention comprises a sample wafer body and an edge sealing layer, wherein the sample wafer body comprises a test area and a sealing area, the sealing area is annularly arranged in the test area, the edge sealing layer is coated on the sealing area, and the edge sealing layer comprises the following components: fluorocarbon metal paint and fluorocarbon metal paint curing agent; the sample wafer is subjected to edge sealing by the fluorocarbon metallic paint, the excellent characteristics of weather resistance and acid and alkali resistance of the sample wafer are utilized, the sample wafer is ensured to have good edge sealing in the whole corrosion test (salt spray test) period, the influence of notch corrosion on the test result is eliminated, the liquid surface horizontal characteristic of the fluorocarbon metallic paint is utilized, and the accurate calculation of the exposed area of the corrosion test coating is ensured by the alignment of the sample wafer marked lines.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic view of a coupon body and a reticle provided in an embodiment of the present invention;
FIG. 2 is a schematic view of a sample wafer edge sealing process provided in an embodiment of the present invention;
FIG. 3 is a topographical view of a coupon body after corrosion testing provided by an embodiment of the present invention;
FIG. 4 is a topographical view of a sample wafer body cleaned of corrosion products using the present method, as provided by an embodiment of the present invention;
FIG. 5 is a flow chart of a method provided by an embodiment of the present invention;
reference numerals: 1-sample, 2-sample marking, 3-painted surface and 4-container.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, 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. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the applicant finds in the course of the invention that: the zinc-aluminum-magnesium plating layer has good corrosion resistance, and the test period is long through a salt spray test or an outdoor exposure test. The conventional aluminum foil edge sealing is easy to cause that the edge sealing is not tight or falls off, the measurement of the exposed area of the plating layer is not accurate, and the test result is easy to be interfered when the corrosion rate of the plating layer is measured by a gravimetric method.
According to an exemplary embodiment of the present invention, a corrosion resistance test sample wafer is provided, the sample wafer includes a sample wafer body and an edge sealing layer, the sample wafer body includes a testing area and a sealing area, the sealing area is disposed around the testing area, the edge sealing layer covers the sealing area, and the edge sealing layer includes: fluorocarbon metallic paint and fluorocarbon metallic paint curing agent.
As an alternative embodiment, the edge sealing layer comprises a first edge sealing layer and a second edge sealing layer which are arranged from inside to outside; the first edge sealing layer comprises the following components: fluorocarbon metal primer and fluorocarbon metal primer curing agent; the second edge sealing layer comprises the following components: fluorocarbon metal finish paint and fluorocarbon metal finish paint curing agent.
As an alternative embodiment, the ratio of the fluorocarbon metal primer to the fluorocarbon metal primer curing agent is 9-11: 1. specifically, the fluorocarbon metal primer is resin fluorocarbon metal primer and corresponding primer curing agent. Controlling the proportion of the fluorocarbon metal primer to the fluorocarbon metal primer curing agent to be 9-11 according to the construction temperature: 1 to control the reasonable curing time of the paint.
As an alternative embodiment, the ratio of the fluorocarbon metal finish paint to the fluorocarbon metal finish paint curing agent is 4-6: 1. specifically, the fluorocarbon metal finish paint is resin fluorocarbon metal finish paint and a corresponding finish paint curing agent. Controlling the proportion of the fluorocarbon metal finish paint to the fluorocarbon metal finish paint curing agent to be 4-6: 1 to control the reasonable curing time of the paint.
It is to be noted that the fluorocarbon metal finish paint and the fluorocarbon metal primer paint are required to be matched for use, and the models recommended or designated by manufacturers are selected.
According to another exemplary embodiment of the present invention, there is provided a method for testing corrosion resistance of zinc-aluminum-magnesium coated steel, the method including:
s1, obtaining a sample wafer body, wherein the sample wafer body is made of zinc-aluminum-magnesium coated steel;
specifically, the zinc-aluminum-magnesium plated steel sheet is cut into pieces of a predetermined specification. And cleaning oil stains on the surface of the sample wafer by ultrasonic cleaning, and then drying by hot air to obtain a sample wafer body.
S2, pre-dividing the sample wafer body into a test area and a sealing area to obtain the area of the test area;
specifically, as shown in fig. 1, a mark line is formed on the four sides of the sample piece at a predetermined distance from the sides with a marker pen, and the area inside the mark line is denoted as S.
S3, coating the edge sealing layer on the sealing area of the sample wafer body to obtain the corrosion resistance test sample wafer;
specifically, uniformly mixing a fluorocarbon metal primer and a primer curing agent according to a certain volume ratio; as shown in fig. 2, one side of the sample wafer body is horizontally and vertically immersed into the mixture of the fluorocarbon metallic paint primer and the primer curing agent, so that the paint surface just covers the marked line, after the paint surface does not flow any more, the process is repeated, and four sides of the sample wafer body are respectively coated; and (3) placing the sample wafer body coated with the mixture of the fluorocarbon metallic paint primer and the primer curing agent for a period of time until the paint surface is completely cured.
Uniformly mixing fluorocarbon metal paint finish and a finish curing agent according to a certain volume ratio, wherein the volume ratio is 5: 1; as shown in fig. 2, one side of the sample wafer body coated with the first edge sealing layer is horizontally and vertically immersed into a mixture of fluorocarbon metallic paint finish and finish curing agent, so that the paint surface just covers the marked line, and after the paint surface does not flow any more, the process is repeated, and four sides of the sample wafer body are respectively coated; and (3) placing the sample wafer coated with the mixture of the fluorocarbon metal paint finish and the finish curing agent for a period of time until the paint surface is completely cured.
And S4, carrying out corrosion resistance test on the corrosion resistance test sample wafer to obtain the corrosion speed of the coating.
Specifically, the coated edge-sealing layer sample wafer body was weighed and the weight was recorded as W0(ii) a Putting the mixture into a salt spray test device or an outdoor exposure field for corrosion test, cleaning a coating corrosion product, weighing again, wherein the weight is W, and calculating according to a formula
Figure RE-GDA0003354006210000051
The corrosion speed K of the plating layer of the sample wafer can be calculated.
By adopting the design, the edge sealing adopts the fluorocarbon metallic paint which has excellent weather resistance and acid and alkali resistance, can ensure that the edge sealing state of the sample wafer is intact in the whole corrosion test period, eliminates the influence of notch corrosion of the sample wafer, and simultaneously adopts the immersion type coating method to ensure that the area calculation error is smaller.
The applicant finds in the course of the invention that: the corrosion products of the zinc-aluminum-magnesium coating are different from those of the conventional pure zinc and aluminum-zinc coating due to the existence of magnesium element, and mainly comprise Mg (OH)2、4MgCO3·Mg(OH)2And Zn5(CO3)2(OH)6The cleaning by using the conventional chemical reagent is easy to cause incomplete removal of corrosion products and interference on test results.
The applicant provides a method for removing corrosion products, which can effectively remove the corrosion products, and the specific method is as follows:
firstly, preparing a solution A by mixing 200-250 g of glycine (NH)2CH2COOH) was added with distilled water to prepare a 1000mL solution.
Preparing a solution B by mixing 150-200 g of chromium trioxide (CrO)3) 10-20 g silver nitrate (AgNO)3) Distilled water was added to prepare a 1000mL solution.
And thirdly, washing the aluminum-magnesium plated steel plate sample wafer with the corrosion test (salt spray test) for a time length of T with distilled water, drying the sample wafer with hot air, immersing the sample wafer into the solution A, immersing the sample wafer for 5-20 minutes at normal temperature, taking out the sample wafer, washing the surface with distilled water, brushing the surface with a soft brush, and finally drying the sample wafer with hot air.
Soaking the sample wafer treated in the step III into the solution B for 20-60 minutes at normal temperature, taking out the sample wafer, washing with distilled water, brushing the surface with a soft brush, and finally drying with hot air.
Fifthly, weighing the sample wafer treated in the step (iv), and recording the weight as W.
According to the formula
Figure RE-GDA0003354006210000061
The corrosion speed K of the plating layer of the sample wafer can be calculated.
The corrosion resistance test piece and the method for testing the corrosion resistance of the zinc-aluminum-magnesium plated steel of the present application will be described in detail with reference to examples.
Example 1
The hot dip galvanized aluminum-magnesium steel sheet with the brand number TDC51D + ZM2 is taken as an example.
First, TDC51D + ZM2 Corrosion resistance test specimen preparation
Firstly, cutting the zinc-aluminum-magnesium coated steel plate into sample pieces with a certain specification, wherein the specification is 75-150 mm. And cleaning the oil stains on the surface of the sample wafer by ultrasonic cleaning, and then drying by hot air.
Secondly, as shown in fig. 1, marking lines are made on the four sides of the sample wafer at a certain distance from the sides by using a marking pen, wherein the distance is 5mm, and the inner area of each marking line is marked as S.
Uniformly mixing the fluorocarbon metal primer and the primer curing agent according to a certain volume ratio, wherein the volume ratio is 10: 1.
and fourthly, as shown in figure 2, horizontally and vertically immersing one side of the sample into the mixture of the fluorocarbon metallic paint primer and the primer curing agent to ensure that the paint surface just covers the marked line, repeating the process after the paint surface does not flow, and respectively coating four sides of the sample.
Fifthly, placing the sample wafer coated with the mixture of the fluorocarbon metallic paint primer and the primer curing agent for a period of time until the paint surface is completely cured.
Uniformly mixing fluorocarbon metal paint finish paint and finish paint curing agent according to a certain volume ratio, wherein the volume ratio is 5: 1.
and seventhly, as shown in figure 2, horizontally and vertically immersing one side of the sample sheet in the fifth step into a mixture of the fluorocarbon metallic paint finishing coat and the finishing coat curing agent, enabling the paint surface to just cover the marked line, repeating the process after the paint surface does not flow any more, and respectively coating four sides of the sample sheet.
Placing the sample piece coated with the mixture of the fluorocarbon metal paint finish and the finish curing agent for a period of time until the paint surface is completely cured.
Ninthly, weighing the sample wafer manufactured in the step eight and recording the weight as W0
And (c) putting the sample wafer manufactured in the process into a salt spray test device or an outdoor exposure field for corrosion test.
Method for removing corrosion products of TDC51D + ZM2 coating
Preparing solution A by mixing 200g of glycine (NH)2CH2COOH) was added with distilled water to prepare a 1000mL solution.
② preparing solution B by preparing 150g of chromium trioxide (CrO)3) 10g of silver nitrate (AgNO)3) Distilled water was added to prepare a 1000mL solution.
Thirdly, washing TDC51D + ZM2 steel plate sample wafers (shown in figure 3) with corrosion test duration T by distilled water, soaking the sample wafers into the solution A after the sample wafers are dried by hot air, soaking the sample wafers for 10 minutes at normal temperature, taking the sample wafers out, washing the sample wafers by the distilled water, brushing the surface by a soft brush, and finally drying the sample wafers by the hot air.
Soaking the sample wafer treated in the step III in the solution B for 30 minutes at normal temperature, taking out the sample wafer, washing with distilled water, brushing the surface with a soft brush, and finally drying with hot air. The corrosion product removal effect is shown in fig. 4.
Fifthly, weighing the sample wafer treated by the process, and recording the weight as W.
According to the formula
Figure RE-GDA0003354006210000071
The corrosion speed K of the plating layer of the sample wafer can be calculated.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) according to the sample wafer provided by the embodiment of the invention, the edge sealing is made of fluorocarbon metallic paint, so that the weather resistance and the acid and alkali resistance are excellent, the sample wafer can be ensured to be in a good edge sealing state in the whole corrosion test period, and the influence of notch corrosion of the sample wafer is eliminated;
(2) the method provided by the embodiment of the invention adopts an immersion type coating method, utilizes the horizontal characteristic of the liquid surface of the fluorocarbon metallic paint, and can ensure that the area calculation error is smaller through the alignment of the sample wafer and the marking;
(3) the method provided by the embodiment of the invention prepares the new first solution and the second solution, and ensures that the corrosion products of the coating are completely removed and the weighing data is accurate by a step-by-step cleaning mode.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The utility model provides a corrosion resistance test sample wafer, its characterized in that, the sample wafer includes sample wafer body and banding layer, the sample wafer body includes test zone and sealing area, the sealing area ring is located the test zone, the banding layer cladding in the sealing area, the composition on banding layer includes: fluorocarbon metallic paint and fluorocarbon metallic paint curing agent.
2. The corrosion resistance test specimen according to claim 1, wherein the edge sealing layer includes a first edge sealing layer and a second edge sealing layer disposed from the inside to the outside; the first edge sealing layer comprises the following components: fluorocarbon metal primer and fluorocarbon metal primer curing agent; the second edge sealing layer comprises the following components: fluorocarbon metal finish paint and fluorocarbon metal finish paint curing agent.
3. The corrosion resistance test specimen according to claim 2, wherein the ratio of the fluorocarbon metal primer to the fluorocarbon metal primer curing agent is 9 to 11: 1.
4. the corrosion resistance test sample piece according to claim 2, wherein the ratio of the fluorocarbon metal finish paint to the fluorocarbon metal finish paint curing agent is 4-6: 1.
5. a method for testing the corrosion resistance of zinc-aluminum-magnesium coated steel is characterized by comprising the following steps:
obtaining a sample wafer body, wherein the sample wafer body is made of zinc-aluminum-magnesium coated steel;
pre-dividing the sample wafer body into a test area and a sealing area to obtain the area of the test area;
coating an edge sealing layer on the sealing area of the sample wafer body to obtain the corrosion resistance test sample wafer according to any one of claims 1 to 4;
and carrying out corrosion resistance test on the corrosion resistance test sample wafer to obtain the corrosion speed of the plating layer.
6. The method for testing the corrosion resistance of the zinc-aluminum-magnesium coated steel according to claim 5, wherein the corrosion resistance test comprises: cleaning corrosion products, wherein the cleaning corrosion products specifically comprise:
immersing the corrosion resistance test sample wafer subjected to the corrosion test into a first solution, wherein the effective component of the first solution comprises glycine;
and immersing the corrosion resistance test sample wafer soaked in the first solution into a second solution, wherein the effective components of the second solution comprise chromium trioxide and silver nitrate.
7. The method for testing corrosion resistance of zinc-aluminum-magnesium coated steel according to claim 6, wherein 200g to 250g of glycine is dissolved in 1L of the solvent in the first solution.
8. The method for testing corrosion resistance of zinc-aluminum-magnesium coated steel according to claim 6, wherein 150g to 200g of chromium trioxide and 10g to 20g of silver nitrate are dissolved in 1L of the solvent in the second solution.
9. The method for testing corrosion resistance of zinc-aluminum-magnesium coated steel according to claim 5, wherein the step of coating the sealing edge layer on the sealing area of the sample body to obtain the corrosion resistance test sample according to any one of claims 1 to 4 comprises the following steps:
coating the first edge sealing layer on the sealing area of the sample wafer body;
and coating a second edge sealing layer on the first edge sealing layer.
10. The method for testing corrosion resistance of zinc-aluminum-magnesium coated steel according to claim 9, wherein the composition of the first sealing layer comprises: the fluorocarbon metal primer and the fluorocarbon metal primer curing agent are mixed according to the proportion of 9-11: 1; the second edge sealing layer comprises the following components: the fluorocarbon metal finish paint comprises fluorocarbon metal finish paint and a fluorocarbon metal finish paint curing agent, wherein the proportion of the fluorocarbon metal finish paint to the fluorocarbon metal finish paint curing agent is 4-6: 1.
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