CN104359743A - Special solution for corrosion of metallographic phase of high-Cr ferritic heat-resistant steel, as well as preparation method of solution - Google Patents
Special solution for corrosion of metallographic phase of high-Cr ferritic heat-resistant steel, as well as preparation method of solution Download PDFInfo
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- CN104359743A CN104359743A CN201410656415.4A CN201410656415A CN104359743A CN 104359743 A CN104359743 A CN 104359743A CN 201410656415 A CN201410656415 A CN 201410656415A CN 104359743 A CN104359743 A CN 104359743A
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Abstract
The invention relates to a special solution for corrosion of metallographic phase of a high-Cr ferritic heat-resistant steel. The solution comprises ferric chloride, 36-38wt% hydrochloric acid and distilled water at use amount ratio of 1g:8mL:20mL; a preparation method comprises the following steps: firstly, grinding the ferric chloride into fine powder with the particle size of 30-40 meshes; then adding the fine powder type ferric chloride into the 36-38wt% hydrochloric acid to be thoroughly dissolved, and finally adding the distilled water to obtain the solution; the prepared special solution for the phase corrosion is used for the metallographic phase analysis of the high-Cr ferritic heat-resistant steel. The special solution and the preparation method thereof have the advantages that the materials for preparing the special solution for the corrosion are common, the preparation method of the solution is easy, simple and convenient to operate, the corrosion effect is good, the successful rate is high, and the operation of research in a laboratory and a factory is facilitated.
Description
Technical field
The present invention relates to the metallographic examination of the effective high Cr jessop material of thermal power generation boiler, particularly a kind of high Cr jessop etching pit special solution and preparation method thereof.
Background technology
Countries in the world thermal power generation unit parameter forward supercritical parameter and above development in recent years improves its thermal efficiency with this.Power equipment technology is closely related to the development of high-power high parameter future development and jessop, wherein high Cr jessop is with its excellent combination property, extensively adopted by current elevated steam conditions genset in the world, have broad application prospects and high researching value.Metallographic structure analysis is most important in high Cr jessop research process and the basic link that must carry out.High Cr jessop contains multiple alloying component, and belong to low carbon high alloy steel, in production, it is organized as martensitic stucture.In metallographic specimen preparation process, causing corrosive effect not good because not having special applicable corrosive liquid to high Cr jessop material at present, the problems such as corrosion success ratio is lower.The invention provides a kind of high Cr jessop etching pit special solution composition proportion, preparation process and using method.
Summary of the invention
The object of the invention is for above-mentioned existing problems, a kind of high Cr jessop etching pit special solution and preparation method thereof and application thereof are provided, for the metallographic microanalysis of high Cr jessop material provides efficient path easily.
Technical scheme of the present invention:
A kind of high Cr jessop etching pit special solution, be that the hydrochloric acid of 36-38wt% and distilled water form by iron chloride, concentration, the amount ratio of iron chloride, hydrochloric acid and distilled water is 1g:8mL:20 mL.
A preparation method for described high Cr jessop etching pit special solution, first iron chloride being ground to form particle diameter is 30-40 object fine powder; Then fine-powdered iron chloride being added concentration is make it dissolve completely in the hydrochloric acid of 36-38wt%, finally adds distilled water and obtains, and obtained etching pit special solution is put into airtight container and is placed in cool place, dry place and preserve.
A kind of application of described high Cr jessop etching pit special solution, for the metallographic examination of high Cr jessop material, method is: after first being rinsed by Cr jessop sample clear water high after polishing, dewater with absolute ethyl alcohol, sample lies against on testing table, and polished surface level upwards; Drip the corrosion special solution configured to sample polished surface with glue head dropper, the area of average 5mm × 5mm drips, and often drips for 0.05mL, and etching time is 1.5min; Then rinse the corrosion special solution remaining in specimen surface with a large amount of clear water, then dry up sample with after washes of absolute alcohol with hair drier; Finally sample put into the medium pending metallographic structure analysis of test box and take microstructure picture.
Advantage of the present invention is: it is common that this corrosion special solution prepares material, and solution manufacturing method is easy, and easy and simple to handle, corrosive effect is good, and success ratio is high, is beneficial in laboratory and factory research and operates.
(4) accompanying drawing explanation
Fig. 1 is high Cr jessop metallographic microstructure photo for this special solution corrodes.
(5) embodiment
Embodiment:
A kind of high Cr jessop etching pit special solution, be that the hydrochloric acid of 36-38wt% and distilled water form by iron chloride, concentration, the amount ratio of iron chloride, hydrochloric acid and distilled water is 1g:8mL:20 mL.
The preparation method of described high Cr jessop etching pit special solution, first 5g iron chloride being ground to form particle diameter is 30-40 object fine powder; Then fine-powdered iron chloride being added 40 mL concentration is make it dissolve completely in the hydrochloric acid of 36-38wt%, finally adds 100 mL distilled water and obtains, and obtained etching pit special solution is put into airtight container and is placed in cool place, dry place and preserve.
The application of described high Cr jessop etching pit special solution, for the metallographic examination of high Cr jessop material, the representative steel grade T91 steel adopting high Cr jessop is experiment material, the chemical composition of T91 steel: Fe-0.09C-9.0Cr-1.0Mo-0.4Mn-0.20V-0.08Nb, cuboid experimental sample is cut with Linear cut, be of a size of: 10 mm × 10mm × 20mm, be wherein of a size of the end face of 10 mm × 10mm as experiment face.First after being rinsed by the high Cr jessop sample clear water after experiment mirror polish, then dewater with absolute ethyl alcohol, sample lies against on testing table, and polished surface level upwards; Evenly drip 2 corrosion special solutions configured with glue head dropper to sample polished surface, etching time is 1.5min; Then rinse the corrosion special solution remaining in specimen surface with a large amount of clear water, then dry up sample with after washes of absolute alcohol with hair drier; Finally sample put into the medium pending metallographic structure analysis of test box and take microstructure picture.
Fig. 1 is high Cr jessop metallographic microstructure photo for this special solution corrodes, and photo shows: high Cr jessop microstructure is martensitic stucture, martensite lath, martensite bundle, martensite bag sharp outline, high-visible.
Claims (3)
1. a high Cr jessop etching pit special solution, is characterized in that: be that the hydrochloric acid of 36-38wt% and distilled water form by iron chloride, concentration, and the amount ratio of iron chloride, hydrochloric acid and distilled water is 1g:8mL:20 mL.
2. a preparation method for high Cr jessop etching pit special solution as claimed in claim 1, is characterized in that: first iron chloride being ground to form particle diameter is 30-40 object fine powder; Then fine-powdered iron chloride being added concentration is make it dissolve completely in the hydrochloric acid of 36-38wt%, finally adds distilled water and obtains, and obtained etching pit special solution is put into airtight container and is placed in cool place, dry place and preserve.
3. the application of a high Cr jessop etching pit special solution as claimed in claim 1, it is characterized in that: for the metallographic examination of high Cr jessop material, method is: after first being rinsed by Cr jessop sample clear water high after polishing, dewater with absolute ethyl alcohol, sample lies against on testing table, and polished surface level upwards; Drip the corrosion special solution configured to sample polished surface with glue head dropper, the area of average 5mm × 5mm drips, and often drips for 0.05mL, and etching time is 1.5min; Then rinse the corrosion special solution remaining in specimen surface with a large amount of clear water, then dry up sample with after washes of absolute alcohol with hair drier; Finally sample put into the medium pending metallographic structure analysis of test box and take microstructure picture.
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| CN107904599A (en) * | 2017-10-25 | 2018-04-13 | 江苏省沙钢钢铁研究院有限公司 | A kind of IF steel metallographic etching agent |
| CN109540634A (en) * | 2018-11-20 | 2019-03-29 | 中国航发贵州黎阳航空动力有限公司 | A kind of detection method for GH4648 sheet coupon crystal grain and microscopic structure |
| CN110108541A (en) * | 2019-05-20 | 2019-08-09 | 有研工程技术研究院有限公司 | A kind of preparation method of High Purity Gold microstructure sample |
| CN113913827A (en) * | 2021-09-09 | 2022-01-11 | 东风汽车集团股份有限公司 | Quenching and tempering zinc-plated carbon steel metallographic corrosive agent and application thereof |
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| CN109540634A (en) * | 2018-11-20 | 2019-03-29 | 中国航发贵州黎阳航空动力有限公司 | A kind of detection method for GH4648 sheet coupon crystal grain and microscopic structure |
| CN110108541A (en) * | 2019-05-20 | 2019-08-09 | 有研工程技术研究院有限公司 | A kind of preparation method of High Purity Gold microstructure sample |
| CN110108541B (en) * | 2019-05-20 | 2021-09-03 | 有研工程技术研究院有限公司 | Preparation method of high-purity gold microstructure sample |
| CN113913827A (en) * | 2021-09-09 | 2022-01-11 | 东风汽车集团股份有限公司 | Quenching and tempering zinc-plated carbon steel metallographic corrosive agent and application thereof |
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Application publication date: 20150218 |