CN106086893A - For showing caustic and the method for low-alloy high-strength steel welding heat affected zone subregion - Google Patents
For showing caustic and the method for low-alloy high-strength steel welding heat affected zone subregion Download PDFInfo
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- CN106086893A CN106086893A CN201610414196.8A CN201610414196A CN106086893A CN 106086893 A CN106086893 A CN 106086893A CN 201610414196 A CN201610414196 A CN 201610414196A CN 106086893 A CN106086893 A CN 106086893A
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- caustic
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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
- C23F1/28—Acidic compositions for etching iron group metals
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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
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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 present invention relates to a kind of caustic for showing low-alloy high-strength steel welding heat affected zone subregion and method, this caustic includes component A for corrosion step one and component B for corrosion step two, described component A be mass fraction be the FeCl of 5～8%3Solution, component B is grouped into by the one-tenth of following by volume percentages: nitric acid: 2～2.5%, Fluohydric acid.: 0.5～1.5%, and remaining is dehydrated alcohol；After first corroding by component A of caustic and clean, then corrode by component B of caustic, combination corrosion the most in two steps, macroscopical metallographic of each subregion in corrosion welding heat affected zone can be shown；Use the caustic of the present invention and can significantly demonstrate the border of welding heat affected zone subregion with reference to the caustic solution of the present invention, it is simple to the measurement of welding heat affected zone size, thus the physical dimension carrying out welding bead accurately is arranged, thus realizing temper bead/ annealing bead technology.
Description
Technical field
The present invention relates to Welding Repair Technology field, specifically one be used for showing low-alloy high-strength steel sweating heat shadow
Ring caustic and the method distinguishing district.
Background technology
In welding process, due to the distribution of welding heat source, the zones of different of mother metal experienced by different sweating heats
Circulation, thus obtain different structural states.From the point of view of low-alloy steel, for its welding heat affected zone tissue and the difference of performance
Different, welding heat affected zone subregion is broadly divided into coarse grain zone, fine grained region, critical zone.For low-alloy steel pressure vessel and equipment
When carrying out temper bead/ annealing bead REPAIR WELDING, the corrosion of each subregion in welding heat affected zone and dimensional measurement are temper bead/ annealing bead technology implementations
Premise and key.
Under normal circumstances, the corrosion of low-alloy steel welding heat affected zone generally uses FeCl3Solution, nital,
Distilled water flushing is used after the corrosion such as the mixed solution of concentrated hydrochloric acid and ethanol.But said method is at corrosion low-alloy steel sweating heat shadow
Can only corrode, when ringing district, fusion penetration and the welding heat affected zone layer side edge weld seam, can not significantly corrode and sweating heat shadow
Ring coarse grain zone, fine grained region and the edge of IRCGHAZ in district；Even if the corrosion at fusion penetration and welding heat affected area edge is asked
In topic, above-mentioned caustic also just has preferable effect only for specific high intensity steel grade.
Recently as the surging development of domestic nuclear power, nuclear power generation is being increasingly becoming the major way of domestic power supply,
But nuclear facilities parts under arms during stand the problems such as high temperature, high pressure and neutron irradiation for a long time, thus cause nuclear facilities parts
Produce failure fracture.Nuclear facilities parts need to carry out post weld heat treatment in the fabrication process, but the equipment lost efficacy during being on active service
Cannot be carried out post weld heat treatment, be therefore accomplished by when REPAIR WELDING using a kind of welding without post weld heat treatment to repair
Recovering technology temper bead/ annealing bead technology.The principle of temper bead/ annealing bead technology is that the physical dimension utilizing welding heat affected zone characterizes sweating heat
The thermo parameters method of circulation, thus realize the REPAIR WELDING without post weld heat treatment.Therefore the standard of welding heat affected zone physical dimension
Really measure the basic premise that (i.e. the measurement of the partitions sizes of welding heat affected zone) is this technology implementation.
Summary of the invention
It is an object of the invention to provide a kind of caustic for showing low-alloy high-strength steel welding heat affected zone subregion and
Method, the method can be corroded the border each subregion in welding heat affected zone clearly, is possible not only to measure accurately sweating heat
The physical dimension of the zone of influence, also has certain reference significance for the welding temperature field distribution under welding heat source effect.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of caustic for showing low-alloy high-strength steel welding heat affected zone subregion, this caustic includes for corrosion step
Component A of one and component B for corrosion step two, described component A be mass fraction be the FeCl of 5～8%3Solution, component B
Being grouped into by the one-tenth of following by volume percentages: nitric acid: 2～2.5%, Fluohydric acid.: 0.5～1.5%, remaining is dehydrated alcohol.
Described component A be mass fraction be the FeCl of 6%3Solution.
Described component B is grouped into by the one-tenth of following by volume percentages: nitric acid: 2%, Fluohydric acid.: 1%, and remaining is anhydrous
Ethanol.
Described component B is grouped into by the one-tenth of following by volume percentages: nitric acid: 2.5%, Fluohydric acid.: 1%, and remaining is nothing
Water-ethanol.
The volume ratio of described component A and component B is 1:2 ~ 2:1.
A kind of caustic solution utilizing caustic described above, comprises the following steps:
Step one: take component A of caustic and be heated to 45 DEG C ~ 55 DEG C, by ground welding heat affected zone metallographic specimen leaching
Enter in component A after heating, will treat that corrosion surface immerses uniformly, and avoid contacting with container simultaneously, and treat that specimen surface burnt hair will be sent out
Take out time dark, dry up after being rinsed with distilled water or dehydrated alcohol；
Step 2: take component B of caustic, metallographic specimen step one processed immerses in component B and takes out after 25 ~ 35s, uses
Dehydrated alcohol dries up after rinsing.
In described step one, component A of caustic is heated to 50 DEG C.
Metallographic specimen step one processed in described step 2 immerses in component B and takes out after 30s.
Beneficial effects of the present invention:
Caustic and the method for showing low-alloy high-strength steel welding heat affected zone subregion that the present invention provides is low for iron-based
Alloy high-strength steel, i.e. based on the high intensity steel grade of Fe element, this method first with component A(of caustic i.e. mass fraction be 5～
The FeCl of 8%3Solution) corrode and clean after, then (be i.e. grouped by the one-tenth of following by volume percentages by component B of caustic
Becoming: nitric acid: 2～2.5%, Fluohydric acid.: 0.5～1.5%, remaining is dehydrated alcohol) corrode, combination corrosion the most in two steps,
Macroscopical metallographic of each subregion in corrosion welding heat affected zone can be shown；Use caustic the corrosion side of the reference present invention of the present invention
Method can significantly demonstrate the border of welding heat affected zone subregion, it is simple to the measurement of welding heat affected zone size, thus accurately
Carry out the physical dimension arrangement of welding bead, thus realize temper bead/ annealing bead technology；The present invention is not limited only to the weldering before using temper bead/ annealing bead
Joint physical dimension is measured, and is also applied for macroscopical etching pit and the fusion penetration measurement etc. of low-alloy high-strength steel.
Accompanying drawing explanation
Fig. 1 be volume fraction be 4% nital corrosion after shape appearance figure；
Fig. 2 is shape appearance figure after liquor ferri trichloridi corrosion；
Fig. 3 is shape appearance figure after the corrosion of example 1 method；
Fig. 4 is shape appearance figure after the corrosion of example 2 method.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further elaborated.
A kind of caustic for showing low-alloy high-strength steel welding heat affected zone subregion, this caustic includes for corroding
Component A of step one and component B for corrosion step two, described component A be mass fraction be the FeCl of 5～8%3Solution,
Component B is grouped into by the one-tenth of following by volume percentages: nitric acid: 2～2.5%, Fluohydric acid.: 0.5～1.5%, and remaining is anhydrous
Ethanol.
A kind of caustic solution utilizing caustic described above, comprises the following steps:
Step one: take component A of caustic and be heated to 45 DEG C ~ 55 DEG C, by ground welding heat affected zone metallographic specimen leaching
Enter in component A after heating, will treat that corrosion surface immerses uniformly, and avoid contacting with container simultaneously, and treat that specimen surface burnt hair will be sent out
Take out time dark, dry up after being rinsed with distilled water or dehydrated alcohol；
Step 2: take component B of caustic, metallographic specimen step one processed immerses in component B and takes out after 25 ~ 35s, uses
Dehydrated alcohol dries up after rinsing.
Embodiment 1:
The tungsten inert-gas welding joint of SA508-3 steel is immersed the FeCl that mass percent is 5% that temperature is 50 DEG C3In, wait to corrode
Surface should be immersed uniformly, avoids contacting with container simultaneously, takes out when surface burnt hair shades；By taking-up sample dehydrated alcohol
It is rinsed, and uniformly dries up with hair-dryer；Sample after drying up immerse volume fraction be 2% nitric acid, 1% Fluohydric acid., remaining
HNO for dehydrated alcohol3-HF-C2H5After OH solution corrodes 30s, dehydrated alcohol is used to be rinsed using hair-dryer to blow subsequently
Dry.
Embodiment 2:
The tungsten inert-gas welding joint of WELDOX960E steel is immersed the FeCl that mass percent is 6% that temperature is 50 DEG C3In, treat
Corrosion surface should immerse uniformly, avoids contacting with container simultaneously, takes out when surface burnt hair shades；Sample will be taken out with anhydrous
Ethanol is rinsed, and uniformly dries up with hair-dryer；To dry up rear sample immerse volume fraction be 2.5% nitric acid, 1% Fluohydric acid.,
Remaining is the HNO of dehydrated alcohol3-HF-C2H5After OH solution corrodes 30s, dehydrated alcohol is used to be rinsed using subsequently blowing
Machine dries up.
Embodiment 3:
The tungsten inert-gas welding joint of SA508-3 steel is immersed the FeCl that mass percent is 8% that temperature is 45 DEG C3In, wait to corrode
Surface should be immersed uniformly, avoids contacting with container simultaneously, takes out when surface burnt hair shades；By taking-up sample dehydrated alcohol
It is rinsed, and uniformly dries up with hair-dryer；Sample after drying up immerse volume fraction be 2% nitric acid, 0.5% Fluohydric acid., its
Remaining is the HNO of dehydrated alcohol3-HF-C2H5After OH solution corrodes 35s, dehydrated alcohol is used to be rinsed using subsequently hair-dryer
Dry up.
Embodiment 4:
The tungsten inert-gas welding joint of WELDOX960E steel is immersed the FeCl that mass percent is 6% that temperature is 55 DEG C3In, treat
Corrosion surface should immerse uniformly, avoids contacting with container simultaneously, takes out when surface burnt hair shades；Sample will be taken out with anhydrous
Ethanol is rinsed, and uniformly dries up with hair-dryer；To dry up rear sample immersing volume fraction is 2.5% nitric acid, 1.5% hydrogen fluorine
Acid, remaining be the HNO of dehydrated alcohol3-HF-C2H5After OH solution corrodes 25s, dehydrated alcohol is used to be rinsed using subsequently
Hair-dryer dries up.
Fig. 1 be volume fraction be 4% nital corrosion after pattern, it can be seen that after corrosion weld melt run unclear
Clear, each border, welding heat affected zone is inconspicuous；Fig. 2 position uses the pattern after liquor ferri trichloridi corrosion, it can be seen that corrosion shape
Without obvious border in coarse grain zone and fine grained region in looks, it is impossible to carry out welding bead measurement.
Fig. 3,4 it is respectively the pattern after embodiment 1,2 corrosion, it can be seen that weld seam, coarse grain zone, fine grained region after corrosion, face
Boundary line, battery limit (BL) is obvious, can observe four regions (weld seam, coarse grain zone, fine grained region, critical zone) big of welding point clearly
Little.
Claims (8)
1. the caustic being used for showing low-alloy high-strength steel welding heat affected zone subregion, it is characterised in that: this caustic bag
Include component A for corrosion step one and component B for corrosion step two, described component A be mass fraction be 5～8%
FeCl3Solution, component B is grouped into by the one-tenth of following by volume percentages: nitric acid: 2～2.5%, Fluohydric acid.: 0.5～1.5%,
Remaining is dehydrated alcohol.
2. the caustic for showing low-alloy high-strength steel welding heat affected zone subregion as claimed in claim 1, its feature exists
In: described component A be mass fraction be the FeCl of 6%3Solution.
3. the caustic for showing low-alloy high-strength steel welding heat affected zone subregion as claimed in claim 1, its feature exists
In: described component B is grouped into by the one-tenth of following by volume percentages: nitric acid: 2%, Fluohydric acid.: 1%, and remaining is dehydrated alcohol.
4. the caustic for showing low-alloy high-strength steel welding heat affected zone subregion as claimed in claim 1, its feature exists
In: described component B is grouped into by the one-tenth of following by volume percentages: nitric acid: 2.5%, Fluohydric acid.: 1%, and remaining is anhydrous second
Alcohol.
5. the caustic for showing low-alloy high-strength steel welding heat affected zone subregion as claimed in claim 1, its feature exists
In: the volume ratio of described component A and component B is 1:2 ~ 2:1.
6. the caustic solution utilizing caustic as claimed in claim 1, it is characterised in that comprise the following steps:
Step one: take component A of caustic and be heated to 45 DEG C ~ 55 DEG C, by ground welding heat affected zone metallographic specimen leaching
Enter in component A after heating, will treat that corrosion surface immerses uniformly, and avoid contacting with container simultaneously, and treat that specimen surface burnt hair will be sent out
Take out time dark, dry up after being rinsed with distilled water or dehydrated alcohol；
Step 2: take component B of caustic, metallographic specimen step one processed immerses in component B and takes out after 25 ~ 35s, uses
Dehydrated alcohol dries up after rinsing.
7. caustic solution as claimed in claim 6, it is characterised in that: in described step one, component A of caustic is heated to 50
℃。
8. caustic solution as claimed in claim 6, it is characterised in that: the metallographic examination in described step 2, step one processed
Sample immerses in component B and takes out after 30s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610414196.8A CN106086893B (en) | 2016-06-15 | 2016-06-15 | For showing the corrosive agent and method of low-alloy high-strength steel welding heat affected zone subregion |
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| CN201610414196.8A CN106086893B (en) | 2016-06-15 | 2016-06-15 | For showing the corrosive agent and method of low-alloy high-strength steel welding heat affected zone subregion |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756510A (en) * | 2017-01-03 | 2017-05-31 | 华东交通大学理工学院 | A kind of etchant for showing low-alloy wear-resistant steel original austenite crystal prevention and its application |
| CN110068492A (en) * | 2018-01-24 | 2019-07-30 | 宝山钢铁股份有限公司 | A kind of metallographic etching agent and its application method for the dyeing of advanced high-strength steel retained austenite |
| CN110553891A (en) * | 2018-05-30 | 2019-12-10 | 大族激光科技产业集团股份有限公司 | Macroscopic metallographic corrosive liquid and metallographic corrosive method for stainless steel aluminum alloy connecting layer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080224092A1 (en) * | 2007-03-15 | 2008-09-18 | Samsung Electronics Co., Ltd. | Etchant for metal |
| CN102383131A (en) * | 2011-11-03 | 2012-03-21 | 模德模具(东莞)有限公司 | Formula for corrosive medicinal liquid used for high hardness die steel and preparation method for same |
| CN102808179A (en) * | 2011-05-31 | 2012-12-05 | 西安赛特金属材料开发有限公司 | Metallographic etchant and metallographic etching method for pure titanium and beta titanium alloy |
| CN104480470A (en) * | 2014-12-07 | 2015-04-01 | 金川集团股份有限公司 | Titanium metal sample metallurgical etching solution and etching method |
-
2016
- 2016-06-15 CN CN201610414196.8A patent/CN106086893B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080224092A1 (en) * | 2007-03-15 | 2008-09-18 | Samsung Electronics Co., Ltd. | Etchant for metal |
| CN102808179A (en) * | 2011-05-31 | 2012-12-05 | 西安赛特金属材料开发有限公司 | Metallographic etchant and metallographic etching method for pure titanium and beta titanium alloy |
| CN102383131A (en) * | 2011-11-03 | 2012-03-21 | 模德模具(东莞)有限公司 | Formula for corrosive medicinal liquid used for high hardness die steel and preparation method for same |
| CN104480470A (en) * | 2014-12-07 | 2015-04-01 | 金川集团股份有限公司 | Titanium metal sample metallurgical etching solution and etching method |
Non-Patent Citations (1)
| Title |
|---|
| 王庆江等: ""SA508-3钢冲击韧性补偿影响因素的分析"", 《焊接》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756510A (en) * | 2017-01-03 | 2017-05-31 | 华东交通大学理工学院 | A kind of etchant for showing low-alloy wear-resistant steel original austenite crystal prevention and its application |
| CN110068492A (en) * | 2018-01-24 | 2019-07-30 | 宝山钢铁股份有限公司 | A kind of metallographic etching agent and its application method for the dyeing of advanced high-strength steel retained austenite |
| CN110553891A (en) * | 2018-05-30 | 2019-12-10 | 大族激光科技产业集团股份有限公司 | Macroscopic metallographic corrosive liquid and metallographic corrosive method for stainless steel aluminum alloy connecting layer |
| CN110553891B (en) * | 2018-05-30 | 2022-04-01 | 大族激光科技产业集团股份有限公司 | Macroscopic metallographic corrosive liquid and metallographic corrosive method for stainless steel aluminum alloy connecting layer |
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Address after: No.88, Binhe North Road, hi tech Zone, Luoyang City, Henan Province Patentee after: CSSC Shuangrui (Luoyang) special equipment Co.,Ltd. Address before: No.88, Binhe North Road, hi tech Zone, Luoyang City, Henan Province Patentee before: LUOYANG SUNRUI SPECIAL EQUIPMENT Co.,Ltd. |