CN110344060A - It is a kind of for showing the corrosive agent and its preparation and application of zinc-iron alloy hot-dip galvanized steel sheet coating structure - Google Patents
It is a kind of for showing the corrosive agent and its preparation and application of zinc-iron alloy hot-dip galvanized steel sheet coating structure Download PDFInfo
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- CN110344060A CN110344060A CN201910620362.3A CN201910620362A CN110344060A CN 110344060 A CN110344060 A CN 110344060A CN 201910620362 A CN201910620362 A CN 201910620362A CN 110344060 A CN110344060 A CN 110344060A
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- zinc
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- galvanized steel
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/30—Acidic compositions for etching other metallic material
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- 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
- G01N1/32—Polishing; Etching
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Abstract
The invention discloses a kind of for showing the corrosive agent and its preparation and application of zinc-iron alloy hot-dip galvanized steel sheet coating structure; it is described to be made of nital and picral; in raw material composition; picric acid acidity is weak; after being used in mixed way with nitric acid, layer protecting film can be formed in specimen surface, to inhibit the etch rates and depth of zinc layers to a certain extent; it avoids occurring apparent etch step between zinc layers and substrate, obtains clearly zn-fe alloy coating structure.Corrosive agent configuration is simple, and toxicity is smaller, and is easy to get stable corrosive effect.
Description
Technical field
The invention belongs to technical field of detection of metal, and in particular to one kind is for showing zinc-iron alloy electro-galvanized steel
The corrosive agent and its preparation and application of plate coating structure.
Background technique
After hot-galvanized steel takes coating bath out of, is heated once again into Alloying Treatment furnace, ferro element is made to diffuse to zinc layers,
Uniform zinc-iron alloy layer is formed on coiled sheet, here it is zinc-iron alloy hot-dip galvanized steel sheets.According to Fe-Zn phasor, typical
α phase, Γ phase, Γ will be sequentially generated in hot galvanizing tissue1Phase, δ phase, ζ phase, η phase.However, obtained from documents and materials, it is practical
Mainly there are Γ phase, Γ in the alloyed hot-dip galvanized steel plate observed1Phase, δ phase.Corrosion appropriate is carried out to zinc-iron alloy layer,
The composed structure that can know zinc-iron alloy layer, studies the growth rhythm of coating, the relationship between structure of plating layer and performance,
Reference is provided with optimized alloy technological parameter to formulate.
Existing zinc-iron alloy caustic solution mainly uses nitric acid alcohol or nitric acid amyl alcohol solution etc. or extent of corrosion
It should not grasp, it is difficult to obtain satisfied corrosive effect；Or have biggish toxicity, danger is brought to testing crew.
Summary of the invention
In order to solve the above technical problems, the present invention provides one kind for showing zinc-iron alloy hot-dip galvanized steel sheet coating knot
The corrosive agent and its preparation and application of structure, corrosive agent configuration is simple, and toxicity is smaller, and is easy to get stable corrosion effect
Fruit.
The technical scheme adopted by the invention is as follows:
It is a kind of for showing the corrosive agent of zinc-iron alloy hot-dip galvanized steel sheet coating structure, the corrosive agent is by nitric acid alcohol
Solution and picral composition.
The ratio between volume of the nital and picral is 1-1.2:1, preferably 1:1.
The volumetric concentration of the nital is 1-2%.The volumetric concentration of the picral is 1-
2%.The erosive velocity and depth that can control zinc layers after two kinds of acid solutions mixing of concentration in this way, obtain clearly zn-fe alloy coating
Structure.
It is dehydrated alcohol for preparing alcohol used in nital and picral.
The present invention also provides the systems of the corrosive agent for showing zinc-iron alloy hot-dip galvanized steel sheet coating structure
Nital and picral are directly uniformly mixed by Preparation Method.
The present invention also provides making for the corrosive agent for showing zinc-iron alloy hot-dip galvanized steel sheet coating structure
With method, after the cross section of zinc-iron alloy hot-dip galvanized steel sheet sample is ground and polished, through the corrosive agent etch, can obtain
To clearly zn-fe alloy coating structure.
Further, the time of the etch is 10-20 seconds.Control obtains clearly zinc-iron conjunction within such time
Gold plate structure.
Compared with prior art, provided by the present invention for the corrosion of display zinc-iron alloy hot-dip galvanized steel sheet coating structure
The configuration of agent is simple, and toxicity is smaller, and is easy to get stable corrosive effect.In its raw material composition, picric acid acidity is weak, with nitre
After acid is used in mixed way, can specimen surface formed layer protecting film, thus inhibit to a certain extent zinc layers etch rates and
Depth avoids occurring apparent etch step between zinc layers and substrate, obtains clearly zn-fe alloy coating structure.
Detailed description of the invention
Fig. 1 is the zn-fe alloy coating structure picture obtained in the embodiment of the present invention；
Fig. 2 is the zn-fe alloy coating structure picture obtained in comparative example 1 of the present invention；
Fig. 3 is the zn-fe alloy coating structure picture obtained in comparative example 2 of the present invention；
Fig. 4 is the zn-fe alloy coating structure picture obtained in comparative example 3 of the present invention.
Specific embodiment
The following describes the present invention in detail with reference to examples.
Embodiment 1
The sample for carrying out this zinc-iron alloy hot-dip galvanized steel sheet coating phase structure corrosion research is DX51D+ZF steel plate,
Its alloying temperature is 550 DEG C, and Al content is 0.14% in zinc pot.It is carried out after diffraction analysis it is found that its coating structure by
Γ phase and δ phase composition.
Taking size is the zinc-iron alloy hot-dip galvanized steel sheet of 20mm*20mm, and sample carries out cross section and inlays, grinds, polishes.
1-2% nital and 1-2% picral is respectively configured, by isometric nital
It is mixed, is placed to room temperature with picral.
By the sample after grinding and polishing through mixed solution etch about 10 seconds, clearly zn-fe alloy coating can be obtained
Structure, as a result as shown in Figure 1.
Comparative example 1
By the volume ratio of 1-2% nital, 1-2% picral in embodiment 1 from 1-1.2:1
2:1 is replaced with, obtained zn-fe alloy coating structure from figure with partial region as shown in Fig. 2, can distinguish Γ phase, Γ 1 and δ
Phase, but Γ phase is corroded relatively deeply.
Comparative example 2
The volumetric concentration of 1-2% nital, 1-2% picral in embodiment 1 is replaced with
The volumetric concentration of 0.5% nital, 0.5% picral, erosion time replace with 20s, obtained zinc-iron
Alloy layer structure is as shown in figure 3, as can be seen from the figure etch pit is than more serious, but coating structure does not show clearly.
Comparative example 3
The mixed solution of 1-2% nital, 1-2% picral in embodiment 1 is replaced with only
There is 1-2% nital, obtained zn-fe alloy coating structure is as shown in figure 4, as can be seen from the figure most of region
Over etching phenomenon than more serious, have apparent etch pit, and the etch of coating edge is more serious, the shape between matrix and protective layer
At apparent step.
It is above-mentioned referring to embodiment to a kind of corrosive agent for showing zinc-iron alloy hot-dip galvanized steel sheet coating structure and its
The detailed description that preparation and application carries out, is illustrative without being restrictive, can enumerate according to limited range
Several embodiments, therefore the change and modification in the case where not departing from present general inventive concept, should belong to protection scope of the present invention it
It is interior.
Claims (8)
1. a kind of for showing the corrosive agent of zinc-iron alloy hot-dip galvanized steel sheet coating structure, which is characterized in that the corrosive agent
It is made of nital and picral.
2. according to claim 1 for showing the corrosive agent of zinc-iron alloy hot-dip galvanized steel sheet coating structure, feature
It is, the ratio between volume of the nital and picral is 1-1.2:1.
3. it is according to claim 1 or 2 for showing the corrosive agent of zinc-iron alloy hot-dip galvanized steel sheet coating structure, it is special
Sign is that the volumetric concentration of the nital is 1-2%.
4. it is according to claim 1 or 2 for showing the corrosive agent of zinc-iron alloy hot-dip galvanized steel sheet coating structure, it is special
Sign is that the volumetric concentration of the picral is 1-2%.
5. it is according to claim 1 or 2 for showing the corrosive agent of zinc-iron alloy hot-dip galvanized steel sheet coating structure, it is special
Sign is, is dehydrated alcohol for preparing alcohol used in nital and picral.
6. according to claim 1 for showing the corrosion of zinc-iron alloy hot-dip galvanized steel sheet coating structure described in -5 any one
The preparation method of agent, which is characterized in that be directly uniformly mixed nital and picral.
7. according to claim 1 for showing the corrosion of zinc-iron alloy hot-dip galvanized steel sheet coating structure described in -5 any one
The application method of agent, which is characterized in that after the cross section of zinc-iron alloy hot-dip galvanized steel sheet sample is ground and polished, through described
Clearly zn-fe alloy coating structure can be obtained in corrosive agent etch.
8. application method according to claim 7, which is characterized in that the time of the etch is 10-20 seconds.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910620362.3A CN110344060B (en) | 2019-07-10 | 2019-07-10 | Corrosive agent for displaying coating structure of zinc-iron alloy hot-dip galvanized steel sheet and preparation and use methods thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910620362.3A CN110344060B (en) | 2019-07-10 | 2019-07-10 | Corrosive agent for displaying coating structure of zinc-iron alloy hot-dip galvanized steel sheet and preparation and use methods thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147171A (en) * | 2020-09-22 | 2020-12-29 | 武汉钢铁有限公司 | Micron-sized hot-dip galvanized automobile sheet stamping bright spot defect analysis method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147171A (en) * | 2020-09-22 | 2020-12-29 | 武汉钢铁有限公司 | Micron-sized hot-dip galvanized automobile sheet stamping bright spot defect analysis method |
| CN112147171B (en) * | 2020-09-22 | 2024-05-28 | 武汉钢铁有限公司 | Method for analyzing stamping bright point defects of micron-sized hot dip galvanized automobile sheet |
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| CN110344060B (en) | 2021-06-15 |
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