CN113390775B - Method for detecting macroscopic corrosion resistance of coating of cold-rolled electroplated tin steel plate - Google Patents
Method for detecting macroscopic corrosion resistance of coating of cold-rolled electroplated tin steel plate Download PDFInfo
- Publication number
- CN113390775B CN113390775B CN202010178702.4A CN202010178702A CN113390775B CN 113390775 B CN113390775 B CN 113390775B CN 202010178702 A CN202010178702 A CN 202010178702A CN 113390775 B CN113390775 B CN 113390775B
- Authority
- CN
- China
- Prior art keywords
- sample
- cold
- water
- steel plate
- corrosion resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Pathology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention disclosesA method for detecting the macroscopic corrosion resistance of a plating layer of a cold-rolled electroplated tin steel plate mainly solves the technical problem that the macroscopic corrosion resistance of the plating layer of the existing cold-rolled electroplated tin steel plate cannot be accurately detected. The invention discloses a method for detecting macroscopic corrosion resistance of a coating of a cold-rolled electrolytic tin-plated steel plate, which comprises the following steps: 1) Preparing a sample; 2) Soaking the sample in water, and 3) heating the sample, wherein the heating treatment is divided into two stages, the first stage is used for heating the water and the sample from room temperature to 40-60 ℃, and keeping the temperature for 15-90min; in the second stage, heating the water and the sample to over 90 ℃ and preserving the heat for 40-300min; then taking out the sample from the water; drying the sample; 4) Calculating the macroscopic corrosion resistance of the test sample, wherein the number of rust points is 20/dm higher than that of the adjacent area 2 Is a macroscopic corrosion-prone region. The method has the advantages of simple operation, low cost, high resolution, good reproducibility and high detection precision.
Description
Technical Field
The invention relates to a method for detecting corrosion resistance of a cold-rolled electroplated tin steel plate, in particular to a method for detecting macroscopic corrosion resistance of a plating layer of a cold-rolled electroplated tin steel plate, and belongs to the field of corrosion resistance performance test of steel materials.
Background
The cold-rolled electroplated tin steel plate is an important component of the packaging industry of food, beverage and the like, and in the performance detection of the tin plate, three methods related to corrosion resistance evaluation are mainly provided, namely a porosity method (PHG), an iron dissolution method (ISV) and an alloy coupling current (ATC), wherein the ISV and the ATC mainly aim at 5.6g/m 2 The above thick tin products, PHG mainly aims at 2.8g/m 2 The three methods can well evaluate the corrosion active sites such as microscopic pores, exposed iron and the like on the surface of the product, but the corrosion resistance difference of the whole plate surface or the large-size range cannot be detected due to the sampling size (phi is less than or equal to 50 mm) and the position limitation and the combination of the corrosion medium difference.
In addition, accelerated corrosion methods such as damp heat and salt spray can represent material surface corrosion active sites with slightly larger sizes, but because the oxygen content in an environment medium cannot be controlled, micro-oxygen or oxygen-free environment after the tinned sheet material is packaged cannot be realized, and the obtained test result is usually completely different from actual data. In addition, the existing scanning Kelvin probe and electrochemical microscope have smaller sample detection size, and are not suitable for monitoring large-scale production process.
In conclusion, the macroscopic corrosion resistance detection method capable of rapidly simulating the micro-oxygen environment of tin plate packaging and realizing the large-size sample is very urgent for guiding field production, and meanwhile, the method can be directly applied to the contact damage detection of the surface and a roller system in the tin plate production and processing process, and the scratch and the invisible corrosion-prone area of the material in the width direction or the length direction can be identified.
Disclosure of Invention
The invention aims to provide a method for detecting the macroscopic corrosion resistance of a coating of a cold-rolled electroplated tin steel plate, which is used for representing and identifying the scratch and corrosion weak point areas on the surface of a large-size tin plate, and the result is used for guiding the control and adjustment of the channel precision in the field production process and improving the yield.
The technical idea of the invention is that the tin plate is placed in a water environment, the oxygen content and the corrosion speed are controlled by temperature, the corrosion evolution process of the strip steel in a packaging environment is simulated, the occurrence of corrosion on the surface of the tin plate is cultivated and accelerated, and the scratching and the invisible corrosion-prone area of the material in the width direction or the length direction are identified by utilizing the relative difference of the number of corrosion points. The method breaks through the size limitation of the existing method, the result is more consistent with the corrosion rule of the tin plate in the packaging environment, and the method can directly guide the field production.
The invention adopts the technical scheme that the method for detecting the macroscopic corrosion resistance of the coating of the cold-rolled electroplated tin steel plate comprises the following steps:
1) Preparing a sample, cutting a rectangular sample on a cold-rolled electrotinning steel plate to be detected, wherein the length of the sample is 100-1300mm, the width of the sample is 50-400mm, coiling the sample into a cylindrical shape, fixing the layers of the sample by using insulating clips, insulating tapes or clamping grooves, and keeping the distance between the layers of the sample to be detected to be 5-50mm;
2) Soaking the sample in water, and soaking the sample in room-temperature water, wherein the water conductivity is less than 100 mu s/m, the water submerges the top of the sample by more than 30mm, the test distance is more than 5mm from the bottom of the heating vessel, and the sample is not in direct contact with the heating vessel;
3) Heating the sample, wherein the heating treatment is divided into two stages, the first stage is used for heating the water and the sample, heating the water and the sample from room temperature to 40-60 ℃, and preserving heat for 15-90min; in the second stage, heating the water and the sample, and keeping the temperature above 90 ℃ for 40-300min; then the sample was taken out of the water; drying the sample;
4) Calculating the macroscopic corrosion resistance of the sample, and observing rust spots on the surface of the sample by naked eyes, wherein the number of the rust spots is 20/dm higher than that of adjacent areas 2 The area of the steel plate is a macroscopic corrosion-prone area, and the macroscopic corrosion resistance of the coating of the cold-rolled electroplated tin steel plate is unqualified; on the contrary, no macroscopic corrosion-prone area exists on the surface of the test sample, and the macroscopic corrosion resistance of the coating of the cold-rolled electroplated tin steel plate is qualified.
When the cold-rolled electroplated tin steel plate has a macroscopic corrosion-prone area, which indicates scratch and invisible corrosion-prone areas in the width direction or the length direction of the cold-rolled electroplated tin steel plate, the equipment and the production process of a production line of the cold-rolled electroplated tin steel plate need to be adjusted and eliminated until the macroscopic corrosion-prone area does not exist on the surface of the cold-rolled electroplated tin steel plate.
Furthermore, the tin plating amount of the single-side plating layer of the cold-rolled electrolytic tin-plated steel plate is 0.7-5.6g/m 2 The uniformity and the good effect of the corrosion resistance of the surface of the cold-rolled electroplated tin steel plate are achieved.
Furthermore, in the step 2) of the invention, the concentration of sodium sulfite which is an oxygen scavenger and is added into the water at room temperature is lower than 10g/L, and the content of dissolved oxygen in the water is controlled to be lower than 5mg/L, so that the effect is good.
The invention is based on the following studies by the applicant: the cold-rolled electroplated tin steel plate has polarity reversal characteristics under different oxygen concentrations, the solubility of oxygen in water is controlled through temperature, the environmental atmosphere of the tin plate in a packaging environment is simulated, the occurrence of corrosion on the surface of the tin plate is cultured and accelerated, the relative difference of the number of rust points is utilized to identify the scraping and invisible corrosion-prone area of the material in the width direction or the length direction, and further the evaluation of the macroscopic corrosion weakness of the tin plate is realized.
Compared with the prior art, the invention has the following positive effects:
1. the method is not limited by the size of a sample of a conventional accelerated corrosion test, has mild corrosion environment and moderate corrosion speed, has data results which are more consistent with the corrosion rule of the tin plate in the tin plate packaging environment, and has the advantages of simple operation, low cost, high resolution, good reproducibility and high detection precision.
2. The method can obviously identify the influence of the production process on the surface processing of the tin plate, particularly the channel invisible micro scratch caused by the roller system, and the result can directly guide the on-site production and the optimization management of the process section.
Drawings
FIG. 1 is a graph showing the distribution of macroscopic corrosion weak points of the tin-plated sheet of the sample of example 1.
FIG. 2 is a scanning electron micrograph of corrosion rust spots after testing the sample of example 1.
FIG. 3 is a graph of the macroscopic corrosion weakness of the tin plate of the sample of example 2.
FIG. 4 is a graph showing the distribution of macroscopic corrosion weak points of the tin-plated sheet of the sample of example 3.
FIG. 5 is a graph showing the distribution of macroscopic corrosion weak points of the tin-plated sheet of the sample of example 4.
Detailed Description
The invention is further illustrated below with reference to examples 1 to 4.
In the embodiment of the invention, when the sample is prepared, the sample is cut out from the cold-rolled electroplated tin steel plate to be detected along the width direction, and the sizes of the samples in the embodiments 1 to 4 are respectively as follows: 812mm × 250mm;860mm × 250mm;834mm × 250mm;836mm × 250mm.
Referring to fig. 1-4, a method for detecting the macroscopic corrosion resistance of a coating of a cold-rolled electroplated tin steel plate comprises the following steps:
1) Preparing a sample, cutting a rectangular sample on a cold-rolled electrolytic tinning steel plate to be tested along the width direction, coiling the sample into a cylindrical shape, fixing the sample layers by using an insulating adhesive tape, and setting the distance between the sample layers to be 10mm;
2) Soaking the sample in water, immersing the sample in room-temperature water, wherein the water submerges 50mm above the top of the sample, the test distance is 15mm from the bottom of a heating vessel, the water conductivity is 46 mu s/m, the dissolved oxygen in the initial water is 4.3mg/L, and the sample is not in direct contact with the heating vessel;
3) Heating the sample, wherein the heating treatment is divided into two stages, the first stage is used for heating the water and the sample, heating the water and the sample from room temperature to 40-60 ℃, and preserving heat for 15-90min; in the second stage, heating the water and the sample to over 90 ℃ and preserving the heat for 40-300min; then taking out the sample from the water; drying the sample;
4) Calculating the macroscopic corrosion resistance of the test sample, and observing the rust spots on the surface of the test sample by naked eyes, wherein the number of the rust spots is 20 per dm higher than that of the adjacent area 2 The area (2) is a macroscopic corrosion-prone area, in examples 1 to 4, a macroscopic corrosion weak point area appears in the middle, and the macroscopic corrosion resistance of the coating of the cold-rolled electroplated tin steel plate is unqualified.
Referring to FIGS. 1 and 2, in example 1, the number of rusted spots in the central 110mm region in the width direction of the tin-plated plate is 60/dm higher than that in the adjacent region 2 And the area is a macroscopic corrosion-prone area, and the macroscopic corrosion resistance of the coating of the cold-rolled electroplated tin steel plate is unqualified. FIG. 2 is a scanning electron micrograph of rust spots in the macroscopic corrosion-prone region of FIG. 1, which indicates to a technician that defects in the corresponding equipment and processes of the production line can be eliminated or eliminated.
Examples 2-4 test results referring to FIGS. 3, 4 and 5, the number of spots of macroscopic corrosion weak points is 60/dm higher than that of adjacent areas 2 The positions of the macroscopic corrosion-prone areas are 180mm, 130mm and 200mm in the middle of the tin plate in the width direction, the positions of the corrosion weak point areas are opposite to the Working Side (WS) and are biased to the Driving Side (DS), and the macroscopic corrosion resistance of the coating of the cold-rolled electroplated tin steel plate is unqualified.
TABLE 1 temperature parameters for samples of inventive examples
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (4)
1. A method for detecting the macroscopic corrosion resistance of a coating of a cold-rolled electroplated tin steel plate is characterized by comprising the following steps:
1) Preparing a sample, cutting a rectangular sample on a cold-rolled electrotinning steel plate to be detected, wherein the length of the sample is 100-1300mm, the width of the sample is 50-400mm, coiling the sample into a cylindrical shape, fixing the layers of the sample by using insulating clips, insulating tapes or clamping grooves, and keeping the distance between the layers of the sample to be detected to be 5-50mm;
2) Soaking the sample in water, and soaking the sample in room-temperature water, wherein the water conductivity is less than 100 mu s/m, the water submerges over 30mm of the top of the sample, the test distance is over 5mm from the bottom of a heating vessel, and the sample is not in direct contact with the heating vessel;
3) Heating the sample, wherein the heating process is divided into two stages, the first stage is used for heating water and the sample, heating the water and the sample from room temperature to 40-60 ℃, and preserving heat for 15-90min; in the second stage, heating the water and the sample to over 90 ℃ and preserving the heat for 40-300min; then taking out the sample from the water; drying the sample;
4) Calculating the macroscopic corrosion resistance of the test sample, and observing the rust spots on the surface of the test sample by naked eyes, wherein the number of the rust spots is 20 per dm higher than that of the adjacent area 2 The area of (2) is a macroscopic corrosion-prone area, and the macroscopic corrosion resistance of the coating of the cold-rolled electroplated tin steel plate is unqualified; on the contrary, no macroscopic corrosion-prone area exists on the surface of the test sample, and the macroscopic corrosion resistance of the coating of the cold-rolled electroplated tin steel plate is qualified.
2. The method for detecting the macroscopic corrosion resistance of the coating of the cold-rolled electrolytic tinned steel plate according to claim 1, wherein the tinning amount of the single-side coating of the cold-rolled electrolytic tinned steel plate is 0.7-5.6g/m 2 。
3. The method for detecting the macroscopic corrosion resistance of the coating of the cold-rolled electroplated tin steel plate as claimed in claim 1, wherein in the step 2), the content of dissolved oxygen in water is controlled to be lower than 5mg/L.
4. The method for detecting the macroscopic corrosion resistance of the coating of the cold-rolled electroplated tin steel plate as claimed in claim 1, wherein in the step 2), the concentration of sodium sulfite serving as an oxygen scavenger added into water at room temperature is lower than 10g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010178702.4A CN113390775B (en) | 2020-03-14 | 2020-03-14 | Method for detecting macroscopic corrosion resistance of coating of cold-rolled electroplated tin steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010178702.4A CN113390775B (en) | 2020-03-14 | 2020-03-14 | Method for detecting macroscopic corrosion resistance of coating of cold-rolled electroplated tin steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113390775A CN113390775A (en) | 2021-09-14 |
| CN113390775B true CN113390775B (en) | 2023-01-20 |
Family
ID=77616201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010178702.4A Active CN113390775B (en) | 2020-03-14 | 2020-03-14 | Method for detecting macroscopic corrosion resistance of coating of cold-rolled electroplated tin steel plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113390775B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115201099A (en) * | 2022-08-29 | 2022-10-18 | 中国海洋大学 | Method for detecting density of corrosion active inclusions in low-alloy marine steel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203448A (en) * | 2014-06-27 | 2015-12-30 | 宝山钢铁股份有限公司 | Testing device and method for simulating solar water heater inner barrel accelerated corrosion |
| CN106896052B (en) * | 2017-01-25 | 2019-08-16 | 北京航空航天大学 | A kind of aluminium alloy seawater accelerated corrosion test method |
| CN107141933A (en) * | 2017-05-17 | 2017-09-08 | 郑州人造金刚石及制品工程技术研究中心有限公司 | Polyurethane fan blade coating of the alkene containing nanometer diamond and preparation method thereof |
-
2020
- 2020-03-14 CN CN202010178702.4A patent/CN113390775B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113390775A (en) | 2021-09-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Pang et al. | On the localised corrosion of carbon steel induced by the in-situ local damage of porous corrosion products | |
| CN110411934B (en) | Rapid assessment and prediction method for corrosion grade of aluminum alloy | |
| CN113390775B (en) | Method for detecting macroscopic corrosion resistance of coating of cold-rolled electroplated tin steel plate | |
| Armstrong et al. | Impedance studies of poly ethylmethacrylate coatings formed upon tin-free steel | |
| Guadagnini et al. | The use of scanning electrochemical microscopy for the characterisation of patinas on copper alloys | |
| CN113484396B (en) | Corrosion monitoring device and method for coupling four-probe potential drop measurement and tow electrode | |
| CN111141661A (en) | Method for evaluating galvanic corrosion of mechanical connection structure of dissimilar metal plates in automobile | |
| CN109579746A (en) | A method of detection cold rolling electroplating tin steel plate passivating film | |
| Xia et al. | The corrosion behavior of lacquered tinplate in functional beverage | |
| CN104913962A (en) | Manufacturing device and manufacturing method of partially-corroded steel test piece | |
| CN110763874A (en) | Method and device for researching metal stress corrosion dynamic process by monitoring pitting corrosion | |
| CN108414404B (en) | Method for detecting and judging wettability of porous metal material | |
| CN109580464B (en) | Method for detecting and evaluating coating quality of power grid equipment | |
| CN115575272A (en) | Aluminum alloy conductor material corrosion characteristic identification and service performance test and evaluation method | |
| CN107515190A (en) | A kind of method of microcell electrochemistry evaluation steel spot corrosion probability | |
| CN102680380B (en) | Method for quickly detecting corrosion resistance of stainless steel BA (bright annealed) plate | |
| CN112782257B (en) | Method for detecting component content of passive film of cold-rolled electroplated tin steel plate | |
| CN114609028A (en) | Portable device and method for in-situ detection of corrosion resistance of organic coating | |
| CN105445178B (en) | One kind is for evaluating the active test fluid of surface of steel plate and method for fast measuring | |
| CN110927016B (en) | Method for predicting coating and rolling problems of lithium ion battery | |
| CN114518320A (en) | Accelerated corrosion liquid and method for rapidly detecting corrosion resistance of paint film | |
| JPH05322831A (en) | Test piece | |
| Ambrož et al. | Automation of Metallographic Sample Etching Process | |
| CN109357805A (en) | A kind of detection method of nickel aminosulfonic bath system internal stress | |
| CN113514390A (en) | Method for testing adhesive force of electrophoretic paint film of automobile plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |