CN104046988B - The etching reagent of a kind of midium-carbon steel 16MND5 crystalline grain of steel degree and corrosion process for show thereof - Google Patents
The etching reagent of a kind of midium-carbon steel 16MND5 crystalline grain of steel degree and corrosion process for show thereof Download PDFInfo
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- CN104046988B CN104046988B CN201410259511.5A CN201410259511A CN104046988B CN 104046988 B CN104046988 B CN 104046988B CN 201410259511 A CN201410259511 A CN 201410259511A CN 104046988 B CN104046988 B CN 104046988B
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Abstract
The present invention discloses a kind of midium-carbon steel 16MND5 crystalline grain of steel degree etching reagent and corrosion process for show thereof, and the composition of this etching reagent comprises picric acid, dimethylbenzene, ethanol, wherein picric acid 3-8g, dimethylbenzene 20-50ml, ethanol 5-60ml. This corrosion process for show, comprises the following steps: sample is carried out mill system and polishing by (1); (2) etching reagent is configured; (3) sample is immersed in etching reagent completely; (4) leave standstill corrosion after 20 ~ 40 minutes, take out sample; (5) flow cold water wash, and cleans corrosion vestige; (6) after washing, erosional surface drips alcohol, blows dry; (7) grain size number and the grain fineness number shape looks of evaluation sample are observed. In the present invention, etching reagent proportioning is novel, simple to operate, carry out corrosion for 16MND5 crystalline grain of steel degree sample emphatically to manifest, more original etching reagent corrodes the method manifested, Display of Grain Boundary effect is clear, contribute to accurately evaluating the grain size number of midium-carbon steel 16MND5 steel, for this provides favourable condition with formulation and the optimization of steel production technique.
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 midium-carbon steel 16MND5 crystalline grain of steel degree.
Background technology
Nuclear material 16MND5 steel belongs to structural low alloy steel, should directly carry out grain fineness number inspection by technological standard under Tempering and Quenching state. The caustic solution that domestic inspection 16MND5 crystalline grain of steel generally adopts when spending is that sample is after mill polishing processed, the saturated picric acid aqueous solution add 2 ~ mixing solutions of 10 liquid detergents in repeated multiple times immersion, do not soak 10 minutes��20 minutes not etc. every time, until having demonstrated crystal boundary, but adopt and need in this way repeatedly to soak, 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 being applicable to the inspection of nuclear power 16MND5 crystalline grain of steel degree, and after corroding 16MND5 crystalline grain of steel degree sample with this etching reagent, crystal boundary gets final product the method for clear display.
The present invention is achieved through the following technical solutions: a kind of midium-carbon steel 16MND5 crystalline grain of steel degree etching reagent, 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, to a corrosion process for show for midium-carbon steel 16MND5 crystalline grain of steel degree sample, comprises the following steps:
(1) 16MND5 crystalline grain of steel degree sample is carried out mill system and polishing;
(2) etching reagent is configured;
(3) the mill polished sample of system is put into etching reagent;
(4) leave standstill corrosion after 20 ~ 40 minutes, take out sample;
(5) with the cold water wash sample of flowing, while cleaning, the corrosion vestige of sample erosional surface is cleaned with cotton;
(6) after having cleaned, sample erosional surface drips into alcohol, then uses hair dryer to blow dry sample;
(7) last in metallography microscope Microscopic observation grain fineness number shape looks and evaluate the grain size number of style.
Further, in described step (2), the configuration process 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, it may also be useful to glass stick evenly stirs so that it is mix.
Further, in described step (3), when sample immerses etching reagent, the polished surface of sample upward, and all immerses in etching reagent.
Further, in described step (4), the time left standstill is 30 minutes.
By 16MND5 crystalline grain of steel degree sample, start to configure etching reagent after mill system, polishing; First in the beaker that specification is 100ml, pour 5ml ethanol into, pouring the dimethylbenzene of 50ml into, finally put into the picric acid that about 5g is heavy, finally evenly stir etching reagent with glass stick; With tweezers ready grain fineness number sample polished surface put into etching reagent upward and immerse etching reagent completely, otherwise increase etching reagent to sample can all be immersed on year-on-year basis; Sample starts timing after immersing etching reagent completely, and etching time was at about about 30 minutes; After sample corrodes, take out sample with tweezers, with the cold water wash sample of flowing, while cleaning, clean the corrosion vestige of sample erosional surface with cotton; After having cleaned, sample erosional surface drips several alcohol, then use hair dryer to be blown dry; Last in metallography microscope Microscopic observation grain fineness number shape looks and evaluate the grain size number of style.
The present invention is compared with prior art, the advantage and the useful effect that have be: in the present invention, etching reagent proportioning is novel, simple to operate, carry out corrosion for 16MND5 crystalline grain of steel degree sample emphatically to manifest, more original etching reagent corrodes the method manifested, Display of Grain Boundary effect is clear, contributes to accurately evaluating the grain size number of midium-carbon steel 16MND5 steel, for formulation and the optimization of midium-carbon steel 16MND5 steel production technique provides favourable condition.
Accompanying drawing explanation
Fig. 1 uses the crystal boundary design sketch of tradition etching reagent with the grain fineness number of corrosion process for show display;
Fig. 2 is the crystal boundary design sketch of the grain fineness number that new corrosion etching reagent shows with corrosion process for show in embodiment 1;
Fig. 3 is the crystal boundary design sketch of the grain fineness number that new corrosion etching reagent shows with corrosion process for show in embodiment 2;
Fig. 4 is the crystal boundary design sketch of the grain fineness number that new corrosion etching reagent shows with 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 replacement and change, all should comprise within the scope of the invention.
Embodiment 1:
Present embodiment discloses the etching reagent of a kind of midium-carbon steel 16MND5 crystalline grain of steel degree, the concrete composition of this etching reagent is: picric acid 5g, dimethylbenzene 50ml, ethanol 5ml, the configuration method of this etching reagent is first pour 5ml ethanol in the beaker that specification is 100ml, then pour the dimethylbenzene of 50ml into, finally puts into the picric acid that about 5g is heavy, finally evenly stir with glass stick, obtain required etching reagent.
The invention also discloses the corrosion process for show of above-mentioned etching reagent, it may also be useful to the concrete corrosion process for show of midium-carbon steel 16MND5 crystalline grain of steel degree is by this etching reagent: 16MND5 crystalline grain of steel degree sample mill system, polishing, and configure etching reagent; With tweezers ready grain fineness number sample polished surface put into etching reagent upward and immerse etching reagent completely, otherwise increase etching reagent to sample can all be immersed on year-on-year basis; Sample starts timing after immersing etching reagent completely, and etching time was at about about 30 minutes; After sample corrodes, take out sample with tweezers, with the cold water wash sample of flowing, while cleaning, clean the corrosion vestige of sample erosional surface with cotton; After having cleaned, sample erosional surface drips several alcohol, then use hair dryer to be blown dry; Last in metallography microscope Microscopic observation grain fineness number shape looks and evaluate the grain size number of style.
Use original etching reagent that midium-carbon steel 16MND steel is carried out corrosion to manifest, at metallography microscope Microscopic observation grain fineness number design sketch, as shown in Figure 1.
Use etching reagent described in the present invention that midium-carbon steel 16MND steel is carried out corrosion to manifest, at metallography microscope Microscopic observation grain fineness number design sketch, as shown in Figure 2.
Contrast 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 evaluating the grain size number of midium-carbon steel 16MND5 steel, for formulation and the optimization of midium-carbon steel 16MND5 steel production technique provides favourable condition.
Embodiment 2:
The present embodiment is on the basis of above-described embodiment, have adjusted the component of this etching reagent composition, it is respectively picric acid 5g, dimethylbenzene 20ml, ethanol 60ml, configuring with method in above-described embodiment, then midium-carbon steel 16MND5 crystalline grain of steel degree is carried out concrete corrosion and manifest, the crystal boundary design sketch of the grain fineness number of corrosion process for show display is as shown in Figure 3.
Contrast from Fig. 3 and Fig. 2, when decreasing dimethylbenzene and increase ethanol, namely it is 5g at picric acid, dimethylbenzene is 20ml, ethanol is after the corrosive fluid of 60ml corrodes, the corrosive effect of crystal boundary can also be shown comparatively clearly, but relatively want fuzzyyer compared with the corrosive effect figure in Fig. 2, but the grain size number of accurately evaluation midium-carbon steel 16MND5 steel can also be met.
Embodiment 3:
The present embodiment is on the basis of above-described embodiment, have adjusted the component of this etching reagent composition, it is respectively picric acid 3g, dimethylbenzene 30ml, ethanol 60ml, configuring with method in above-described embodiment, then midium-carbon steel 16MND5 crystalline grain of steel degree is carried out concrete corrosion and manifest, the crystal boundary design sketch of the grain fineness number of corrosion process for show display is as shown in Figure 4.
As shown in Figure 4, reducing the content of picric acid, and increasing the content of dimethylbenzene and ethanol, namely picric acid is 3g, and dimethylbenzene is 30ml, and ethanol is after the carrying out of the etching reagent of 60ml is corroded, Display of Grain Boundary effect is also comparatively clear, it is also possible to accurately show the corrosive effect of crystal boundary clearly.
The above is only the better embodiment of the present invention, and the present invention not does any restriction in form, every above embodiment is done according to the technical spirit of the present invention any simple modification, equivalent variations, all fall within protection scope of the present invention.
Claims (7)
1. etching reagent manifests the purposes of midium-carbon steel 16MND5 crystalline grain of steel degree in corrosion, wherein, etching reagent primarily of 3-8g picric acid, 20 50ml dimethylbenzene, 5 60ml ethanol compositions, concrete corrosion manifests process and comprises the following steps:
(1) 16MND5 crystalline grain of steel degree sample is carried out mill system and polishing;
(2) etching reagent is configured;
(3) the mill polished sample of system is put into etching reagent;
(4) leave standstill corrosion after 20 ~ 40 minutes, take out sample;
(5) with the cold water wash sample of flowing, while cleaning, the corrosion vestige of sample erosional surface is cleaned with cotton;
(6) after having cleaned, sample erosional surface drips into alcohol, then uses hair dryer to blow dry sample;
(7) last in metallography microscope Microscopic observation grain fineness number shape looks and evaluate the grain size number of sample.
2. purposes according to claim 1, it is characterised in that: in the composition of described etching reagent, picric acid is 5g.
3. purposes according to claim 1, it is characterised in that, in the composition of described etching reagent, dimethylbenzene is 50ml.
4. purposes according to claim 1, it is characterised in that, in the composition of described etching reagent, ethanol is 5ml.
5. purposes according to claim 1, it is characterised in that, in described step (2), the configuration process of etching reagent is: first, pour ethanol in beaker into; Next, then pour dimethylbenzene into; Finally put into picric acid, it may also be useful to glass stick evenly stirs so that it is mix.
6. purposes according to claim 1, it is characterised in that, in described step (3), when sample immerses etching reagent, the polished surface of sample upward, and all immerses in etching reagent.
7. purposes according to claim 1, it is characterised in that, in described step (4), the time left standstill is 30 minutes.
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| 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 |
| CN110057650B (en) * | 2019-05-20 | 2022-03-15 | 常德力元新材料有限责任公司 | Method for evaluating steel strip crystal grains |
| 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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| 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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| 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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| 蚀刻液对CrMn钢蚀刻特性的实验研究;范旭日;《中国优秀博硕士学位论文全文数据库（硕士） 工程科技I辑（季刊）》;20050315(第01期);第19页第3段、第22页第1段、第24页末段、第28页第4-5段 * |
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