CN104062164A - Erosion method of gold-phase metallographic structure of double-phase stainless steel - Google Patents
Erosion method of gold-phase metallographic structure of double-phase stainless steel Download PDFInfo
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- CN104062164A CN104062164A CN201410302156.5A CN201410302156A CN104062164A CN 104062164 A CN104062164 A CN 104062164A CN 201410302156 A CN201410302156 A CN 201410302156A CN 104062164 A CN104062164 A CN 104062164A
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Abstract
The invention discloses an erosion method of a gold-phase metallographic structure of double-phase stainless steel. The erosion method is characterized in that oxalic acid is selected as an auxiliary dyeing agent, a sodium-metabisulfite and hydrochloric-acid aqueous solution is added, since the erosion of the sodium-metabisulfite and hydrochloric-acid aqueous solution on the double-phase stainless steel is dyeing erosion and the oxalic acid has the good dyeing-auxiliary action as an auxiliary coloring dyeing agent, the gold-phase metallographic structure of the double-phase stainless steel can be fast and accurately eroded, and simultaneously the color comparison of all phases of structures of a test sample can be obvious; software is used for measuring the content of the structures, so that the errors are relatively small. The erosion method disclosed by the invention has the characteristics of short erosion time, wide erosion range and long effective-erosion time, and finally, all the phases of structures of the test sample can be accurately evaluated, the contents of all the phases of the structures can be measured, and simultaneously an accurate and reliable basis and the like also can be provided for a measured material in practical application of industrial and agricultural production, science and technology building of national defense and the like in China.
Description
[technical field]
The present invention relates to a kind of metallographic etching method, be specifically related to a kind of corrosion method of two phase stainless steel metallographic structure.
[background technology]
Known, two phase stainless steel has good mechanical property, fatigue strength, corrosion resistance and good structural design performance, from the eighties in last century, be just widely used, be acknowledged as the stainless steel grade of main flow of 21 century, and the phase content of two phase stainless steel is an important indicator that determines two phase stainless steel performance quality, to measure exactly the phase content of dual phase steel, first will be accurate, color contrast demonstrates each phase constitution of two phase stainless steel steel brightly, the method of existing erosion two phase stainless steel is: first by the potassium ferricyanide of 10～15g, the NaOH of 10～30g and the water of 100ml mix formation etchant, or by the hydrochloric acid of 10ml, the Sodium Metabisulfite of 0.5g and the water of 50ml mix formation etchant, wherein the former need to boil etchant, and corrode the used time oversize (being generally 5～10 minutes), erosion effect is also bad simultaneously, two compare not obvious, cannot carry out cubage etc. with software, the latter's erosion effect is good, and two-phase is with distinct contrast, and the effect that just will reach acquires a certain degree of difficulty, and its problem is:
1, etchant will be placed a period of time after preparing, and sometimes also needs heating;
2, effective erosion time too short (1～5 minute);
3, erosion time is difficult to hold, and is easy to excessive erosion;
4, do not corrode for a part of sample (as weld seam etc.) or be difficult to corrode etc.
In sum, because the erosion of existing dual phase steel exists above problem, thereby correctly evaluate tissue and measure each phase constitution content and brought certain difficulty to sample.
[summary of the invention]
In order to overcome the deficiency of above-mentioned technology, the invention provides a kind of corrosion method of two phase stainless steel metallographic structure, the present invention is by selecting oxalic acid as dyeing auxiliaries, add Sodium Metabisulfite aqueous hydrochloric acid solution, that a kind of dyeing is corroded because Sodium Metabisulfite aqueous hydrochloric acid solution corrodes two phase stainless steel, and oxalic acid has the good effect of dying that helps as painted dyeing auxiliaries, therefore the present invention can be corroded the metallographic structure of two phase stainless steel quickly and accurately, can make each phase constitution color contrast distinctness of sample simultaneously.
For realizing goal of the invention as above, the present invention adopts technical scheme as described below:
A corrosion method for two phase stainless steel metallographic structure, described corrosion method comprises the steps:
The first step, preparation etchant add successively hydrochloric acid, oxalic acid and Sodium Metabisulfite in a certain amount of water;
Second step, connect step, the examination face of polished sample is immersed in the etchant that the first step prepares, and in etchant, stop 10～50 seconds to specimen surface and be crocus and take out;
The 3rd step, connect step, after the sample wash after second step is corroded, dry up, then carry out the analysis of metallographic structure.
The corrosion method of described two phase stainless steel metallographic structure, the water in the described first step is 50ml.
The corrosion method of described two phase stainless steel metallographic structure, the hydrochloric acid in the described first step is 10ml.
The corrosion method of described two phase stainless steel metallographic structure, the oxalic acid in the described first step is 0.1～5g.
The corrosion method of described two phase stainless steel metallographic structure, the Sodium Metabisulfite in the described first step is 0.5g.
Adopt technical scheme as above, the present invention has superiority as described below:
The corrosion method of a kind of two phase stainless steel metallographic structure of the present invention, the present invention is by selecting oxalic acid as dyeing auxiliaries, add Sodium Metabisulfite aqueous hydrochloric acid solution, that a kind of dyeing is corroded because Sodium Metabisulfite aqueous hydrochloric acid solution corrodes two phase stainless steel, and oxalic acid has the good effect of dying that helps as painted dyeing auxiliaries, therefore the present invention can be quick, corrode exactly the metallographic structure of two phase stainless steel, can make each phase constitution color contrast distinctness of sample simultaneously, less by software measurement tissue content error, it is short that the present invention has the used time of erosion, erosion scope is wide, the effectively long feature of erosion time, final the present invention can evaluate accurately the each phase constitution of sample and measure each phase constitution content, simultaneously also by the material of being measured and monitored the growth of standing timber is in China's industrial and agricultural production, in the practical application of the development of defense-related science and technology etc., provide accurately and reliably according to etc.
[brief description of the drawings]
Fig. 1 is the metallograph that 1.4417 two phase stainless steels are corroded in the present invention;
Fig. 2 is the metallograph that 5A two phase stainless steel is corroded in the present invention;
Fig. 3 is the metallograph that 1.4417 two phase stainless steel weld seams are corroded in the present invention;
Fig. 4 is the metallograph that 5A two phase stainless steel weld seam is corroded in the present invention;
[embodiment]
Can explain in more detail the present invention by the following examples, the present invention is not limited to the following examples;
The corrosion method of a kind of two phase stainless steel metallographic structure of the present invention, described corrosion method comprises the steps:
The first step, preparation etchant add successively hydrochloric acid, the oxalic acid of 0.1～5g and the Sodium Metabisulfite of 0.5g of 10ml in the water of 50ml, and it is optimal technical solution that its mesoxalic acid is selected 0.5g, and it is best that the etchant making corrodes sample effect;
Second step, connect step, the examination face of polished sample is immersed in the etchant that the first step prepares, and in etchant, stop 10～50 seconds to specimen surface and be crocus and take out;
The 3rd step, connect step, after the sample wash after second step is corroded, dry up, then carry out the analysis of metallographic structure.
Specific embodiments of the invention are:
Choosing respectively 1.4417 two phase stainless steels and 5A two phase stainless steel is sample, respectively to 1.4417 two phase stainless steels, 5A two phase stainless steel, 1.4417 two phase stainless steel weld seams and 5A two phase stainless steel weld seam corrode, then in 50ml water, add 10ml hydrochloric acid, add again 0.5g oxalic acid, finally add 0.5g Sodium Metabisulfite to form etchant, polished sample examination face is immersed in etchant, sample stops 10～50 seconds to examination face and is crocus in etchant, stop corroding, now erosion effect the best, then dry up after sample wash with clear water, to micro-Microscopic observation, concrete erosion effect is shown in shown in accompanying drawing 1～4.
Effect of the present invention is:
Corrosion method of the present invention can show each phase constitution of two phase stainless steel fast and accurately, and the color contrast distinctness of each phase constitution, less by software measurement tissue content error, the present invention is by the test to various trade mark two phase stainless steels, embodied the good erosion effect of etchant, outstanding feature of the present invention is that the erosion used time is short, erosion scope wide, effectively erosion time is long;
The present invention has effectively overcome following technical disadvantages:
1, etchant will be placed a period of time after configuring, and sometimes also needs heat treated;
2, effectively erosion time is too short, only has 1～5 minute;
3, erosion time is difficult to hold, and is easy to excessive erosion;
4, some sample (weld seam etc.) do not corroded or be difficult to corrode.
Part not in the detailed description of the invention is prior art.
The embodiment selecting in this article for open object of the present invention, currently thinks suitablely, still, will be appreciated that, the present invention is intended to comprise that all belong to all changes and the improvement of the embodiment in this design and invention scope.
Claims (5)
1. a corrosion method for two phase stainless steel metallographic structure, is characterized in that: described corrosion method comprises the steps:
The first step, preparation etchant add successively hydrochloric acid, oxalic acid and Sodium Metabisulfite in a certain amount of water;
Second step, connect step, the examination face of polished sample is immersed in the etchant that the first step prepares, and in etchant, stop 10～50 seconds to specimen surface and be crocus and take out;
The 3rd step, connect step, after the sample wash after second step is corroded, dry up, then carry out the analysis of metallographic structure.
2. the corrosion method of two phase stainless steel metallographic structure according to claim 1, is characterized in that: the water in the described first step is 50ml.
3. the corrosion method of two phase stainless steel metallographic structure according to claim 1, is characterized in that: the hydrochloric acid in the described first step is 10ml.
4. the corrosion method of two phase stainless steel metallographic structure according to claim 1, is characterized in that: the oxalic acid in the described first step is 0.1～5g.
5. the corrosion method of two phase stainless steel metallographic structure according to claim 1, is characterized in that: the Sodium Metabisulfite in the described first step is 0.5g.
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Cited By (4)
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| CN108004549A (en) * | 2018-01-05 | 2018-05-08 | 华北电力科学研究院有限责任公司 | The metallographic etchant and caustic solution of ferrite/austenite Dissimilar Steel Welded Joint |
| CN109295456A (en) * | 2018-09-13 | 2019-02-01 | 天津重型装备工程研究有限公司 | A kind of the dendrite corrosive liquid and its application method of precipitation strength martensitic stain less steel |
| CN110983339A (en) * | 2019-12-05 | 2020-04-10 | 南京工业大学 | Double-phase stainless steel metallographic corrosive liquid formula and use method thereof |
| CN112504798A (en) * | 2020-11-02 | 2021-03-16 | 抚顺特殊钢股份有限公司 | Metallographic corrosive agent and corrosion method for high-alloy ultra-pure ultra-high strength steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108004549A (en) * | 2018-01-05 | 2018-05-08 | 华北电力科学研究院有限责任公司 | The metallographic etchant and caustic solution of ferrite/austenite Dissimilar Steel Welded Joint |
| CN109295456A (en) * | 2018-09-13 | 2019-02-01 | 天津重型装备工程研究有限公司 | A kind of the dendrite corrosive liquid and its application method of precipitation strength martensitic stain less steel |
| CN109295456B (en) * | 2018-09-13 | 2021-03-09 | 天津重型装备工程研究有限公司 | Dendritic crystal corrosive liquid for precipitation strengthening of martensitic stainless steel and use method thereof |
| CN110983339A (en) * | 2019-12-05 | 2020-04-10 | 南京工业大学 | Double-phase stainless steel metallographic corrosive liquid formula and use method thereof |
| CN112504798A (en) * | 2020-11-02 | 2021-03-16 | 抚顺特殊钢股份有限公司 | Metallographic corrosive agent and corrosion method for high-alloy ultra-pure ultra-high strength steel |
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Application publication date: 20140924 |