CN104046988A - Corrosive agent for grain size of 16MND5 steel for nuclear power and corrosion displaying method using corrosive agent - Google Patents
Corrosive agent for grain size of 16MND5 steel for nuclear power and corrosion displaying method using corrosive agent Download PDFInfo
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- CN104046988A CN104046988A CN201410259511.5A CN201410259511A CN104046988A CN 104046988 A CN104046988 A CN 104046988A CN 201410259511 A CN201410259511 A CN 201410259511A CN 104046988 A CN104046988 A CN 104046988A
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Abstract
The invention discloses a corrosive agent for the grain size of 16MND5 steel for nuclear power and a corrosion displaying method using the corrosive agent. The corrosive agent comprises the following components: 3g-8g of picric acid, 20ml-50ml of xylene and 5ml-60ml of ethanol. The corrosion displaying method comprises the following steps: (1) grinding and polishing a sample; (2) preparing the corrosive agent; (3) completely soaking the sample in the corrosive agent; (4) standing and corroding for 20-40 minutes and taking out the sample; (5) washing by flowing cold water and scrubbing corrosion marks; (6) after washing, dripping alcohol onto a corrosion surface, and blow-drying; and (7) observing and evaluating the grain size grade and the grain size morphology of the sample. The corrosive agent is novel in ratio and concept and simple to operate, and is emphatically used for corrosion displaying of the sample with the grain size of the 16MND5 steel. Compared with a corrosion displaying method using an original corrosive agent, the corrosion displaying method disclosed by the invention has the characteristics that the grain boundary displaying effect is clear, the grain size grade of the 16MND5 steel for the nuclear power can be accurately evaluated, and favorable conditions are provided for design and optimization of a steel production process.
Description
Technical field
The present invention relates to nuclear material physical and chemical inspection technical field, specifically refer to etching reagent and the corrosion process for show thereof of a kind of nuclear power steel 16MND5 crystalline grain of steel degree.
Background technology
Nuclear material 16MND5 steel belongs to structural low alloy steel, should under modified as-heat-treated condition, directly carry out grain fineness number inspection by technological standard.The caustic solution that domestic inspection 16MND5 crystalline grain of steel generally adopts while spending is that sample is after grinding polishing, add repeated multiple times immersion in the mixing solutions of 2 ~ 10 liquid detergents at the saturated picric acid aqueous solution, each do not soak 10 minutes～20 minutes not etc., until demonstrated crystal boundary, need in this way repeatedly to soak but adopt, and the crystal boundary of grain fineness number is unintelligible.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of etching reagent that is applicable to the inspection of nuclear power 16MND5 crystalline grain of steel degree, and gets final product the method for clear demonstration with crystal boundary after this etching reagent corrosion 16MND5 crystalline grain of steel degree sample.
The present invention is achieved through the following technical solutions: steel 16MND5 crystalline grain of steel degree etching reagent for a kind of nuclear power, the composition of described etching reagent comprises picric acid, dimethylbenzene, ethanol, wherein picric acid 3-8g, dimethylbenzene 20-50ml, ethanol 5-60ml.
Further, in the composition of described etching reagent, picric acid is 5g.
Further, in the composition of described etching reagent, dimethylbenzene is 50ml.
Further, in the composition of described etching reagent, ethanol is 5ml.
Above-mentioned etching reagent is the corrosion process for show with steel 16MND5 crystalline grain of steel degree sample to nuclear power, comprises the following steps:
(1) 16MND5 crystalline grain of steel degree sample is ground and polishing;
(2) configuration etching reagent;
(3) put into etching reagent by grinding polished sample;
(4) leave standstill corrosion after 20 ~ 40 minutes, take out sample;
(5), by mobile cold water washed samples, in cleaning, clean the evidence of corrosion of sample erosional surface with cotton;
(6) after having cleaned, sample erosional surface splashes into alcohol, then uses hair dryer to dry up sample;
(7) finally at metallography microscope Microscopic observation grain fineness number pattern and evaluate the grain size number of style.
Further, in described step (2), the layoutprocedure of etching reagent is: first, pour 5ml ethanol in beaker into; Next, then pour 50ml dimethylbenzene into; Finally put into the picric acid of 5g, use glass stick uniform stirring, it is mixed.
Further, in described step (3), sample immerses when etching reagent, and the polished surface of sample upward, and all immerses in etching reagent.
Further, in described step (4), the standing time is 30 minutes.
By 16MND5 crystalline grain of steel degree sample, start to configure etching reagent through grinding, after polishing; First in the beaker that is 100ml in specification, pour 5ml ethanol into, pouring the dimethylbenzene of 50ml into, finally put into the picric acid that about 5g is heavy, finally use glass stick uniform stirring etching reagent; Ready grain fineness number sample polished surface is put into etching reagent immerse etching reagent completely upward with tweezers, otherwise till increasing on year-on-year basis etching reagent to sample and can all being immersed; Sample starts timing after immersing etching reagent completely, and etching time is about approximately 30 minutes; After sample corrodes, take out sample with tweezers, by mobile cold water washed samples, in cleaning, clean the evidence of corrosion of sample erosional surface with cotton; After having cleaned, on sample erosional surface, drip several alcohol, then use hair dryer to be dried up; Finally at metallography microscope Microscopic observation grain fineness number pattern and evaluate the grain size number of style.
The present invention compared with prior art, the advantage having and beneficial effect are: in the present invention, etching reagent proportioning is novel, simple to operate, corrode and manifest for 16MND5 crystalline grain of steel degree sample emphatically, more original etching reagent corrodes the method manifesting, Display of Grain Boundary effect is clear, contributes to accurately to evaluate the grain size number of nuclear power steel 16MND5 steel, for nuclear power provides favourable condition with formulation and the optimization of steel 16MND5 steel production technique.
Brief description of the drawings
Fig. 1 is the crystal boundary design sketch that uses the grain fineness number of traditional etching reagent and the demonstration of corrosion process for show;
Fig. 2 is the crystal boundary design sketch of new grain fineness number of corroding etching reagent and the demonstration of corrosion process for show in embodiment 1;
Fig. 3 is the crystal boundary design sketch of new grain fineness number of corroding etching reagent and the demonstration of corrosion process for show in embodiment 2;
Fig. 4 is the crystal boundary design sketch of new grain fineness number of corroding etching reagent and the demonstration of corrosion process for show in embodiment 3.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this, without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, make various replacements and change, all should comprise within the scope of the invention.
Embodiment 1:
The present embodiment discloses the etching reagent of a kind of nuclear power steel 16MND5 crystalline grain of steel degree, the concrete composition of this etching reagent is: picric acid 5g, dimethylbenzene 50ml, ethanol 5ml, in the beaker that first collocation method of this etching reagent is is 100ml in specification, pour 5ml ethanol into, then pour the dimethylbenzene of 50ml into, finally put into the picric acid that about 5g is heavy, finally use glass stick uniform stirring, obtain required etching reagent.
The invention also discloses the corrosion process for show of above-mentioned etching reagent, use this etching reagent to the concrete corrosion process for show of nuclear power steel 16MND5 crystalline grain of steel degree to be: 16MND5 crystalline grain of steel degree sample grinds, polishing, and configures etching reagent; Ready grain fineness number sample polished surface is put into etching reagent immerse etching reagent completely upward with tweezers, otherwise till increasing on year-on-year basis etching reagent to sample and can all being immersed; Sample starts timing after immersing etching reagent completely, and etching time is about approximately 30 minutes; After sample corrodes, take out sample with tweezers, by mobile cold water washed samples, in cleaning, clean the evidence of corrosion of sample erosional surface with cotton; After having cleaned, on sample erosional surface, drip several alcohol, then use hair dryer to be dried up; Finally at metallography microscope Microscopic observation grain fineness number pattern and evaluate the grain size number of style.
Use original etching reagent that nuclear power steel 16MND steel is corroded and manifested, at metallography microscope Microscopic observation grain fineness number design sketch, as shown in Figure 1.
Use etching reagent described in the present invention that nuclear power is corroded and manifested with steel 16MND steel, at metallography microscope Microscopic observation grain fineness number design sketch, as shown in Figure 2.
Contrasted from Fig. 1 and Fig. 2, etching reagent provided by the invention and corrosion process for show, more original method, Display of Grain Boundary effect is clear, contribute to accurately to evaluate the grain size number of nuclear power steel 16MND5 steel, for nuclear power provides favourable condition with formulation and the optimization of steel 16MND5 steel production technique.
Embodiment 2:
The present embodiment is on the basis of above-described embodiment, adjust the component of this etching reagent composition, be respectively picric acid 5g, dimethylbenzene 20ml, ethanol 60ml, be configured with method in above-described embodiment, then nuclear power carried out to concrete corrosion with steel 16MND5 crystalline grain of steel degree and manifest, the crystal boundary design sketch of the grain fineness number that corrosion process for show shows as shown in Figure 3.
Contrasted from Fig. 3 and Fig. 2, in the situation that having reduced dimethylbenzene and having increased ethanol, be 5g at picric acid, dimethylbenzene is 20ml, ethanol is after the corrosive fluid of 60ml corrodes, also can show comparatively clearly the corrosive effect of crystal boundary, but relatively want fuzzyyer compared with the corrosive effect figure in Fig. 2, but also can meet the grain size number of accurate evaluation nuclear power steel 16MND5 steel.
Embodiment 3:
The present embodiment is on the basis of above-described embodiment, adjust the component of this etching reagent composition, be respectively picric acid 3g, dimethylbenzene 30ml, ethanol 60ml, be configured with method in above-described embodiment, then nuclear power carried out to concrete corrosion with steel 16MND5 crystalline grain of steel degree and manifest, the crystal boundary design sketch of the grain fineness number that corrosion process for show shows as shown in Figure 4.
As shown in Figure 4, reduce picric content, and increasing the content of dimethylbenzene and ethanol, be that picric acid is 3g, dimethylbenzene is 30ml, after the corroding of the etching reagent that ethanol is 60ml, Display of Grain Boundary effect is also comparatively clear, also can accurately show clearly the corrosive effect of crystal boundary.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, and any simple modification, equivalent variations that every foundation technical spirit of the present invention is done above embodiment, within all falling into protection scope of the present invention.
Claims (8)
1. a steel 16MND5 crystalline grain of steel degree etching reagent for nuclear power, is characterized in that: the composition of described etching reagent comprises picric acid, dimethylbenzene, ethanol wherein picric acid 3-8g, dimethylbenzene 20-50ml, ethanol 5-60ml.
2. steel 16MND5 crystalline grain of steel degree etching reagent for a kind of nuclear power according to claim 1, is characterized in that: in the composition of described etching reagent, picric acid is 5g.
3. steel 16MND5 crystalline grain of steel degree etching reagent for a kind of nuclear power according to claim 1, is characterized in that: in the composition of described etching reagent, dimethylbenzene is 50ml.
4. according to steel 16MND5 crystalline grain of steel degree etching reagent for a kind of nuclear power described in claim 1, it is characterized in that: in the composition of described etching reagent, ethanol is 5ml.
5. utilize the wherein corrosion process for show of the etching reagent described in any one to nuclear power steel 16MND5 crystalline grain of steel degree sample of claim 1 ~ 4, it is characterized in that: comprise the following steps:
(1) 16MND5 crystalline grain of steel degree sample is ground and polishing;
(2) configuration etching reagent;
(3) put into etching reagent by grinding polished sample;
(4) leave standstill corrosion after 20 ~ 40 minutes, take out sample;
(5), by mobile cold water washed samples, in cleaning, clean the evidence of corrosion of sample erosional surface with cotton;
(6) after having cleaned, sample erosional surface splashes into alcohol, then uses hair dryer to dry up sample;
(7) finally at metallography microscope Microscopic observation grain fineness number pattern and evaluate the grain size number of style.
6. steel 16MND5 crystalline grain of steel degree corrosion process for show for nuclear power according to claim 5, is characterized in that: in described step (2), the layoutprocedure of etching reagent is: first, pour 5ml ethanol in beaker into; Next, then pour 50ml dimethylbenzene into; Finally put into the picric acid of 5g, use glass stick uniform stirring, it is mixed.
7. steel 16MND5 crystalline grain of steel degree corrosion process for show for nuclear power according to claim 5, is characterized in that: in described step (3), when sample immerses etching reagent, the polished surface of sample upward, and all immerses in etching reagent.
8. steel 16MND5 crystalline grain of steel degree corrosion process for show for nuclear power according to claim 5, is characterized in that: in described step (4), the standing time is 30 minutes.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092708A (en) * | 2016-06-06 | 2016-11-09 | 四川建筑职业技术学院 | A kind of corrosion process for show of 300M crystalline grain of steel degree |
| CN110057650A (en) * | 2019-05-20 | 2019-07-26 | 常德力元新材料有限责任公司 | The evaluation method of steel band crystal grain |
| CN112284866A (en) * | 2020-10-20 | 2021-01-29 | 中国兵器工业第五二研究所烟台分所有限责任公司 | Corrosion detection method for grain size of molybdenum powder sintering material |
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| JPH02141590A (en) * | 1988-11-24 | 1990-05-30 | Sumitomo Metal Ind Ltd | Ferrite crystal grain boundary developing solution and etching method |
| CN102507292A (en) * | 2011-09-21 | 2012-06-20 | 内蒙古包钢钢联股份有限公司 | Method for displaying austenite grain boundary of low-carbon micro-alloy steel |
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Patent Citations (2)
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| JPH02141590A (en) * | 1988-11-24 | 1990-05-30 | Sumitomo Metal Ind Ltd | Ferrite crystal grain boundary developing solution and etching method |
| CN102507292A (en) * | 2011-09-21 | 2012-06-20 | 内蒙古包钢钢联股份有限公司 | Method for displaying austenite grain boundary of low-carbon micro-alloy steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092708A (en) * | 2016-06-06 | 2016-11-09 | 四川建筑职业技术学院 | A kind of corrosion process for show of 300M crystalline grain of steel degree |
| CN106092708B (en) * | 2016-06-06 | 2020-02-04 | 四川建筑职业技术学院 | Corrosion display method for 300M steel grain size |
| CN110057650A (en) * | 2019-05-20 | 2019-07-26 | 常德力元新材料有限责任公司 | The evaluation method of steel band crystal grain |
| CN112284866A (en) * | 2020-10-20 | 2021-01-29 | 中国兵器工业第五二研究所烟台分所有限责任公司 | Corrosion detection method for grain size of molybdenum powder sintering material |
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