CN112268850A - Method for evaluating corrosion resistance of coated steel plate - Google Patents
Method for evaluating corrosion resistance of coated steel plate Download PDFInfo
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- CN112268850A CN112268850A CN202010976047.7A CN202010976047A CN112268850A CN 112268850 A CN112268850 A CN 112268850A CN 202010976047 A CN202010976047 A CN 202010976047A CN 112268850 A CN112268850 A CN 112268850A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 104
- 238000005260 corrosion Methods 0.000 title claims abstract description 104
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 230000005764 inhibitory process Effects 0.000 claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 16
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 14
- 230000007547 defect Effects 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003973 paint Substances 0.000 claims abstract description 9
- 238000001228 spectrum Methods 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 238000004611 spectroscopical analysis Methods 0.000 claims abstract description 4
- 238000001962 electrophoresis Methods 0.000 claims description 13
- 239000013078 crystal Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 239000011572 manganese Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 abstract description 2
- 230000009897 systematic effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 33
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 21
- 229910052725 zinc Inorganic materials 0.000 description 21
- 239000011701 zinc Substances 0.000 description 21
- 238000000576 coating method Methods 0.000 description 15
- 239000011248 coating agent Substances 0.000 description 13
- 150000003839 salts Chemical class 0.000 description 13
- 239000007921 spray Substances 0.000 description 13
- 238000011156 evaluation Methods 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 239000003929 acidic solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000013268 sustained release Methods 0.000 description 1
- 239000012730 sustained-release form Substances 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004846 x-ray emission Methods 0.000 description 1
Classifications
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- 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
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
-
- 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
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
A method for evaluating corrosion resistance of a coated steel plate belongs to the technical field of coated steel plate detection methods and is used for evaluating corrosion resistance of a coated steel plate. The technical scheme is as follows: 1. performing glow spectrum detection on the silicon-manganese element enrichment content on the surface of the steel substrate of the galvanized plate; 2. performing electron microscope detection on the surface defects of the steel substrate of the galvanized sheet; 3. detecting the Al element content of the galvanized plate along with the depth change by using a glow spectrometry; 4. performing electron microscope detection on iron and aluminum inhibition layer particles on the surface of the steel substrate of the galvanized sheet; 5. observing the cross section inhibiting layer phase of the galvanized sheet by an electron microscope; 6. detecting the quality related information of the phosphating film on the surface of the galvanized plate; 7. and detecting the related information of the electrophoretic paint film thickness on the surface of the galvanized plate. The invention has the advantages of comprehensive and systematic detection method for the coated plate, low cost and easily obtained data result, can prejudge the corrosion resistance of the coated plate according to the requirements of customers, and can carry out relevant guidance on the production of the coated plate, so that the corrosion resistance of the coated plate can meet the requirements of different customers.
Description
Technical Field
The invention relates to a method for evaluating corrosion resistance of a steel plate with a coating, and belongs to the technical field of coated steel plate detection methods.
Background
Galvanized sheets produced by a steel mill often need to be certified by an automobile factory before being sold to the automobile factory, and one certification project which is difficult to pass during certification is galvanized sheet phosphating and corrosion resistance detection after electrophoresis. The specific detection method comprises the following steps: the method comprises the steps of shearing a galvanized plate produced by a steel mill into a specified size, then carrying out phosphating and electrophoresis in a coating workshop of an automobile factory, conveying the electrophoretic test plate to a detection mechanism for sample preparation, generally marking and forking on the surface of a sample, and then carrying out salt spray test and circulating salt spray test detection on the prepared sample, wherein the salt spray test and the circulating salt spray test have long periods, and the time is generally 1 month or longer.
The period of taking data results from the beginning of receiving certification of a steel mill to sample preparation, painting of the steel mill and test plate test detection of the steel mill is generally several months, so that the steel mill generally hopes to pass the certification of the steel mill once, and the adverse effect of repeated certification on the steel mill is avoided; in addition, when the certification of the steel mill is performed, a plurality of steel mills are often performed simultaneously, and it is very important for the steel mills to ensure that the quality and the quantity of steel can meet the requirements of the steel mill within a valid period of time. Therefore, if one can predict the corrosion resistance of a coated sheet produced by a company before certification in an automobile factory, this is very important to the steel factory! Moreover, the corrosion resistance of the coating is generally difficult to pass, and it is important to find a method which can quickly evaluate the corrosion resistance of the coated plate.
The corrosion resistance of galvanized sheets after electrophoresis is influenced by a plurality of factors, which are mainly shown in steel sheet components and some information related to coatings, coating agents and processes thereof, and the like, the component systems of steel sheet substrates and coatings are usually determined, and the information related to coatings can be generally controlled by coating corrosion certification of an automobile factory.
No method for evaluating corrosion resistance of coated plates by engineers before coating corrosion tests is reported in the literature and patents at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for evaluating the corrosion resistance of a coated steel plate, which can quickly evaluate the corrosion resistance of the coated plate, so as to prejudge whether the coating of the coated plate can meet the requirements of different customers, further guide the production of the coated plate, ensure that the corrosion resistance of the coated steel plate meets the requirements of different customers, and save a large amount of manpower, material resources and financial resources.
The technical scheme for solving the technical problems is as follows:
a method for evaluating corrosion resistance of a coated steel plate comprises the following steps:
(1) performing glow spectrum detection on the silicon and manganese enrichment content of the surface of the steel substrate of the galvanized sheet, wherein the maximum silicon and manganese enrichment content is controlled within 0.5 wt.%;
(2) performing electron microscope detection on the surface defects of the steel base material of the galvanized sheet, and detecting whether the steel base material has sharp defects;
(3) detecting the Al element content of the galvanized plate along with the depth change by using a glow spectrometry method, wherein the aluminum content peak value in the iron-aluminum inhibition layer is required to be higher, and the distribution is required to be better;
(4) performing electron microscope detection on iron and aluminum inhibition layer particles on the surface of a steel substrate of the galvanized sheet, wherein the inhibition layer particles are required to be continuous, uniform and compact, and the smaller the inhibition layer particle size is, the better the inhibition layer particle size is;
(5) observing the inhibiting layer phase of the section of the galvanized sheet by an electron microscope, wherein the inhibiting layer phase is required to be well distributed continuously, uniformly and compactly;
(6) detecting the relevant information of the quality of the surface phosphating film of the galvanized sheet;
(7) and detecting the film thickness related information of the surface electrophoresis paint film of the galvanized plate.
In the method for evaluating the corrosion resistance of the coated steel plate, the peak value of the aluminum content in the iron-aluminum inhibiting layer in the step (3) is generally required to be more than or equal to 0.6wt.%, and the distribution width is generally required to be more than or equal to 2 μm.
In the method for evaluating the corrosion resistance of the coated steel plate, the particle size of the inhibition layer on the surface of the steel substrate in the step (4) is generally required to be less than 800 nm.
In the method for evaluating the corrosion resistance of the coated steel plate, the thickness of the cross-section inhibiting layer of the galvanized plate in the step (5) is about 1 μm.
In the method for evaluating the corrosion resistance of the coated steel plate, the Ra value of the surface of the phosphating film on the surface of the galvanized plate in the step (6) is 0.7-1.1, the RPc value is more than 75, the size of the crystal phase meets the requirements of an automobile factory, the general requirement is less than 10 mu m, the crystal phase is uniform, compact and continuous and has no defects, the crystal phase of the galvanized plate is generally recommended to be sheet-shaped or needle-shaped, the weight of the phosphating film meets the recommended value of the automobile factory, and the general weight range of the film is 2-6g/m2。
In the method for evaluating the corrosion resistance of the coated steel plate, the thickness of the electrophoretic paint film on the surface of the galvanized plate in the step (7) is more than 15 mu m.
The invention has the beneficial effects that:
the detection method disclosed by the invention is scientific and reasonable in design, accords with the steel detection rule, is comprehensive and systematic in the detection method of the coated plate, is low in cost, is easy to obtain data results, and has very important value for analyzing, solving and improving the corrosion resistance of the coated plate by engineering technicians.
The method is the initiative of the engineering technicians for carrying out corrosion resistance prejudgment on the coated plate before the coated plate is subjected to a coating corrosion test. By adopting the method, the corrosion resistance of the coated plate can be prejudged according to the specific requirements of customers, and relevant guidance is given to the production of the coated plate, so that the corrosion resistance of the coated plate meets the requirements of different customers, a large amount of manpower, material resources and financial resources are saved, and remarkable economic benefits can be brought to enterprises.
Detailed Description
The method for evaluating the corrosion resistance of the coated steel plate comprises the following steps:
(1) and (4) performing glow spectrum detection on the silicon-manganese element enrichment content on the surface of the steel substrate of the galvanized plate.
Dissolving a zinc layer of the galvanized sheet according to the national standard GB/T13825-2008 'weighing method for unit area mass of a hot-dip galvanized layer of a metal covering layer black metal material', and carrying out related detection on a base material after the zinc layer is just dissolved (bubbles just disappear after an acid solution reacts with zinc).
After the corrosion-inhibiting acidic solution is adopted to dissolve the zinc layer, the damage of the acidic solution to the steel substrate is basically zero. The concrete evidence is as follows: weighing the original galvanized plate on an electronic analytical balance (accurate to one ten thousandth) to obtain M1, wherein the mass of the steel substrate after the zinc layer is dissolved is M2, and continuously soaking the steel substrate in the slow-release acid solution for about 5min to obtain the steel substrate M3. All the operations must strictly comply with the national standard GB/T13825-2008 'weighing method for the unit area of the hot-dip galvanized layer of the ferrous metal material of the metal covering layer'. The parallel samples of the galvanized sheet were subjected to zinc weight detection by X-ray fluorescence spectroscopy, and the weight was M4. The results show that M4= M1-M2 and M2= M3, and the group of data proves that the sustained-release acid solution does not damage the steel substrate basically in the zinc dissolving process and after the zinc layer is dissolved when the weight of the zinc layer is detected by the national standard method.
The steel substrate after zinc dissolution is subjected to glow spectrum detection, and the standard refers to GB/T19502-2004 general Law of chemical analysis of glow discharge emission Spectroscopy method on surface. For data after detection, the enrichment content of silicon and manganese elements on the surface of the steel substrate is mainly concerned, and the maximum enrichment content of silicon and manganese is generally expected to be controlled within 0.5 wt.%.
(2) And (3) performing electron microscope detection on the surface defects of the steel base material of the galvanized plate, and detecting whether the steel base material has sharp defects.
Metallographic phase sample preparation is carried out on the cross section of the galvanized plate, observation is carried out under a scanning electron microscope, the magnification is 3000 times, and the sharp defect of the steel base material is avoided. The reason is that the sharp defect of the steel substrate easily causes the discontinuous iron-aluminum inhibition layer which is not continuous and compact enough, the iron-aluminum inhibition layer is discontinuous, iron element in steel is easy to diffuse into the zinc layer in the galvanizing process, so that the impurity iron element in the zinc layer is increased, and the impure zinc layer is easy to cause self electrochemical corrosion in the saline water environment in the salt spray or circulating salt spray process, so that the consumption of the zinc layer is accelerated.
(3) And detecting the Al element content of the galvanized plate along with the change of the depth by using a glow spectrometry.
The curve of the change of the contents of the three elements of zinc, iron and aluminum along with the depth is focused. The aluminum content value in the iron-aluminum inhibiting layer is generally high, and the distribution is wide, the aluminum content peak value in the iron-aluminum inhibiting layer is generally required to be more than or equal to 0.6wt.%, and the distribution width is generally required to be more than or equal to 2 μm. This is because the change of Al content in the zinc liquid changes the inhibiting layer in the coating, and the difference of the inhibiting layer directly affects the proceeding of the coating alloying, and further affects the electrochemical corrosion resistance of the zinc layer.
(4) And (3) carrying out electron microscope detection on iron and aluminum inhibition layer particles on the surface of the steel substrate of the galvanized sheet.
And dissolving the surface of the galvanized sheet by using dilute sulfuric acid, observing a sample in which the zinc layer is just dissolved by using an electron microscope, and observing the particle size of the inhibition layer. The particle evaluation of the inhibition layer is continuous, uniform and compact, the particle size of the inhibition layer is generally expected to be smaller as better, and the size is generally required to be less than 800 nm.
(5) And observing the cross section inhibiting layer phase of the galvanized sheet by an electron microscope.
The cross section metallographic sample preparation is carried out on the galvanized sheet, dilute sulfuric acid is adopted to erode the cross section of the galvanized sheet, and the evaluation mode aiming at the data result is that the phase distribution of the inhibition layer is continuous, uniform and compact, and the thickness of the inhibition layer is about 1 mu m.
(6) And detecting the relevant information of the quality of the surface phosphating film of the galvanized sheet.
The factors influencing the quality of the phosphating film of the galvanized sheet are mainly reflected in the 'freshness' degree of the surface of the zinc layer, the values of Ra and RPc of the surface. The "freshness" of the zinc layer surface means that the surface of the galvanized sheet has a certain amount of oil after production, and the oil on the surface is not dried before the galvanized sheet is sent to an automobile factory for coating. And secondly, the surface Ra and the surface RPc of the galvanized plate are detected by a roughness meter generally. As for the detection results, for most automobile factories, Ra values are generally recommended to be 0.7 to 1.1, and RPc is generally required to be 75 or more. However, these values are not necessarily completely accurate due to the different manufacturers of phosphating agents. For example, a galvanized sheet with Ra =0.6 and RPc =40 was phosphated and compared with a galvanized sheet with Ra =1.51 and RPc =89, and no difference was found in crystal phase morphology, crystal phase size and uniform dense continuity of the phosphated film. Therefore, it is recommended that galvanized sheets with different Ra and RPc values from home companies be preferentially subjected to phosphating certification before coating certification in an automobile factory, or that these galvanized sheets should be prepared before. Thereby obtain different galvanized sheet phosphating film electron microscope appearances, to electron microscope appearance data, evaluate like this: the size of the crystal phase meets the requirements of automobile factories, generally requires less than 10 mu m, the crystal phase is uniform, compact and continuous, has no defects, and the film weight of the phosphate film meets the recommended values of the automobile factories. And selecting the phosphating appearance of the better galvanized plate corresponding to Ra and RPc values, thereby carrying out relevant authentication on the corrosion of the electrophoretic plate and ensuring that the corrosion resistance of the electrophoretic plate after galvanization passes through smoothly.
(7) And detecting the film thickness related information of the surface electrophoresis paint film of the galvanized plate.
When an automobile coating production line is used for hanging galvanized plates, the thickness of a paint film is generally required to be larger than 15 micrometers, and a certain thickness of the paint film is beneficial to the corrosion resistance detection of the coated plates.
The present invention will be described in further detail with reference to specific examples.
Selecting a certain steel grade galvanized plate DC51D + Z, wherein the weight of zinc is 100g/m on both sides2And reserving samples during the production of different batches of galvanized plates, carrying out glow spectrum detection on the enrichment of silicon and manganese elements on the surface of the steel substrate, carrying out electron microscope detection on the surface defects of the steel substrate, detecting the Al element content of the galvanized plates along with the depth change by adopting a glow spectrum method, carrying out electron microscope detection on the surface inhibition layer particles of the steel substrate, carrying out electron microscope observation on the cross section inhibition layer phase of the galvanized plates, detecting the quality related information of the phosphating film on the surface of the galvanized plates, and detecting the thickness related information of the electrophoretic paint film on the surface of the galvanized plates. A certain cyclic salt spray test standard was selected as a validation, the mass-vehicle standard _ PV 1210 body and accessory corrosion test.
Seven different sets of examples were designed, each set containing two comparative samples, each in a number of 3 pieces. The specific numbering is shown in tables 1 and 2. The sample size was 150mm by 100mm, all coated samples were alcohol scrubbed, blown dry and placed in a desiccator for use.
TABLE 1 basic information of the experimental materials
Table 2 results of sample testing data
Example 1
After phosphorization and electrophoresis are carried out on two groups of samples A1 and A2, a new wallpaper knife is adopted to mark the middle position of the surface of the sample at the same strength and angle, the length of the mark is 90mm, all the samples are placed in a circulating salt spray box, and the test standard and the evaluation standard refer to the mass automobile standard _ PV 1210 automobile body and accessory corrosion test. And evaluating the scribing single-side corrosion width after the test is carried out for 30 periods, and calculating the average value of the scribing single-side corrosion expanding corrosion width data according to each group of expanding corrosion results. The average value of the A1 corrosion single-side corrosion extension is 1.9mm, and the average value of the A2 corrosion single-side corrosion extension is 1.1 mm.
Example 2
After phosphorization and electrophoresis are carried out on two groups of samples B1 and B2, a new wallpaper knife is adopted to mark the middle position of the surface of the sample at the same strength and angle, the length of the mark is 90mm, all the samples are placed in a circulating salt spray box, and the test standard and the evaluation standard refer to the mass automobile standard _ PV 1210 automobile body and accessory corrosion test. And evaluating the scribing single-side corrosion width after the test is carried out for 30 periods, and calculating the average value of the scribing single-side corrosion expanding corrosion width data according to each group of expanding corrosion results. The average value of B1 corrosion single-side corrosion extension is 1.8mm, the area outside the cross is corroded, and the average value of B2 corrosion single-side corrosion extension is 1.1 mm.
Example 3
After phosphorization and electrophoresis are carried out on two groups of samples C1 and C2, a new wallpaper knife is adopted to mark the middle position of the surface of the sample at the same strength and angle, the length of the mark is 90mm, all the samples are placed in a circulating salt spray box, and the test standard and the evaluation standard refer to the mass automobile standard _ PV 1210 automobile body and accessory corrosion test. And evaluating the scribing single-side corrosion width after the test is carried out for 30 periods, and calculating the average value of the scribing single-side corrosion expanding corrosion width data according to each group of expanding corrosion results. The average value of the corrosion unilateral diffusion corrosion of C1 is 1.7mm, and the area outside the cross is corroded. The average value of the C2 corrosion unilateral diffusion corrosion is 1.2 mm.
Example 4
After phosphorization and electrophoresis are carried out on two groups of samples D1 and D2, a new wallpaper knife is adopted to mark the middle position of the surface of the sample at the same strength and angle, the length of the mark is 90mm, all the samples are placed in a circulating salt spray box, and the test standard and the evaluation standard refer to the mass automobile standard _ PV 1210 automobile body and accessory corrosion test. And evaluating the scribing single-side corrosion width after the test is carried out for 30 periods, and calculating the average value of the scribing single-side corrosion expanding corrosion width data according to each group of expanding corrosion results. The average value of the unilateral diffusion corrosion of D1 corrosion is 1.5mm, and the average value of the unilateral diffusion corrosion of D2 corrosion is 1.2 mm.
Example 5
After phosphorization and electrophoresis are carried out on two groups of samples E1 and E2, a new wallpaper knife is adopted to mark the middle position of the surface of the sample at the same strength and angle, the length of the mark is 90mm, all the samples are placed in a circulating salt spray box, and the test standard and the evaluation standard refer to the mass automobile standard _ PV 1210 automobile body and accessory corrosion test. And evaluating the scribing single-side corrosion width after the test is carried out for 30 periods, and calculating the average value of the scribing single-side corrosion expanding corrosion width data according to each group of expanding corrosion results. The average value of the E1 corrosion unilateral corrosion extension is 1.6mm, and the average value of the E2 corrosion unilateral corrosion extension is 1.2 mm.
Example 6
After phosphorization and electrophoresis are carried out on two groups of samples F1 and F2, a new wallpaper knife is adopted to mark the middle position of the surface of the sample at the same strength and angle, the length of the mark is 90mm, all the samples are placed in a circulating salt spray box, and the test standard and the evaluation standard refer to the mass automobile standard _ PV 1210 automobile body and accessory corrosion test. And evaluating the scribing single-side corrosion width after the test is carried out for 30 periods, and calculating the average value of the scribing single-side corrosion expanding corrosion width data according to each group of expanding corrosion results. The average value of the F1 corrosion single-side diffusion corrosion is 2.1mm, and the average value of the F2 corrosion single-side diffusion corrosion is 1.6 mm.
Example 7
After phosphorization and electrophoresis are carried out on two groups of samples G1 and G2, a new wallpaper knife is adopted to mark the middle position of the surface of the sample at the same strength and angle, the length of the mark is 90mm, all the samples are placed in a circulating salt fog tank, and the test standard and the evaluation standard refer to the mass automobile standard _ PV 1210 automobile body and accessory corrosion test. And evaluating the scribing single-side corrosion width after the test is carried out for 30 periods, and calculating the average value of the scribing single-side corrosion expanding corrosion width data according to each group of expanding corrosion results. The average value of the unilateral diffusion corrosion of G1 corrosion is 2.5mm, and the average value of the unilateral diffusion corrosion of G2 corrosion is 1.6 mm.
Claims (6)
1. A method for evaluating corrosion resistance of a coated steel sheet, characterized by comprising: the method comprises the following steps:
(1) performing glow spectrum detection on the silicon and manganese enrichment content of the surface of the steel substrate of the galvanized sheet, wherein the maximum silicon and manganese enrichment content is controlled within 0.5 wt.%;
(2) performing electron microscope detection on the surface defects of the steel base material of the galvanized sheet, and detecting whether the steel base material has sharp defects;
(3) detecting the Al element content of the galvanized plate along with the depth change by using a glow spectrometry method, wherein the aluminum content peak value in the iron-aluminum inhibition layer is required to be higher, and the distribution is required to be better;
(4) performing electron microscope detection on iron and aluminum inhibition layer particles on the surface of a steel substrate of the galvanized sheet, wherein the inhibition layer particles are required to be continuous, uniform and compact, and the smaller the inhibition layer particle size is, the better the inhibition layer particle size is;
(5) observing the inhibiting layer phase of the section of the galvanized sheet by an electron microscope, wherein the inhibiting layer phase is required to be well distributed continuously, uniformly and compactly;
(6) detecting the relevant information of the quality of the surface phosphating film of the galvanized sheet;
(7) and detecting the film thickness related information of the surface electrophoresis paint film of the galvanized plate.
2. The method of evaluating the corrosion resistance of a coated steel sheet according to claim 1, wherein: the peak value of the aluminum content in the iron-aluminum inhibiting layer in the step (3) is generally required to be more than or equal to 0.6wt.%, and the distribution width is generally required to be more than or equal to 2 μm.
3. The method of evaluating the corrosion resistance of a coated steel sheet according to claim 1, wherein: the particle size of the surface inhibition layer of the steel substrate in the step (4) is generally required to be less than 800 nm.
4. The method of evaluating the corrosion resistance of a coated steel sheet according to claim 1, wherein: and (5) the thickness of the cross section inhibition layer of the galvanized sheet in the step (5) is about 1 mu m.
5. The method of evaluating the corrosion resistance of a coated steel sheet according to claim 1, wherein: the Ra value of the surface of the phosphating film on the surface of the galvanized sheet in the step (6) is 0.7-1.1, the RPc value is required to be more than 75, the size of the crystal phase meets the requirements of an automobile factory, the crystal phase is generally required to be less than 10 mu m, the crystal phase is uniform, compact and continuous, and has no defects, the crystal phase of the galvanized sheet is generally recommended to be sheet-shaped or needle-shaped, the weight of the phosphating film meets the recommended value of the automobile factory, and the general weight range of the film is 2-6g/m2。
6. The method of evaluating the corrosion resistance of a coated steel sheet according to claim 1, wherein: and (3) the thickness of the electrophoretic paint film on the surface of the galvanized plate in the step (7) is more than 15 mu m.
Priority Applications (1)
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