CN1019823B - Metal hiding electrograving writing shows reagent and process for show thereof again - Google Patents
Metal hiding electrograving writing shows reagent and process for show thereof againInfo
- Publication number
- CN1019823B CN1019823B CN91104014A CN91104014A CN1019823B CN 1019823 B CN1019823 B CN 1019823B CN 91104014 A CN91104014 A CN 91104014A CN 91104014 A CN91104014 A CN 91104014A CN 1019823 B CN1019823 B CN 1019823B
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- China
- Prior art keywords
- writing
- electrograving
- reagent
- acid
- metal
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Investigating And Analyzing Materials By Characteristic Methods (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The present invention is that a kind of metal hiding electrograving writing reproduces reagent and process for show thereof.The spark that directly discharges with electric engraving machine produces the heat energy ablation, forms the electrograving writing in the metallic surface.Utilize ablation place that acid is had higher solidity to corrosion.And the lower principle of position solidity to corrosion of not ablating, according to different metals or identical material and electric engraving machine power difference, the depth difference of the ablation layer that produces, select and prepare the chemical reagent of different concns and compatibility, and the reagent of preparation is applied in electrograving writing mew according to certain method and step, just can make the writing reproduction.Provide admissible evidence for cracking weapon robber, robbery part and investigation air accident of plane incident reason or changing parts.
Description
The present invention relates to a kind of metal writing and ruined reproducting method, chemical reagent and process for show thereof that particularly a kind of metal hiding electrograving writing reproduces.
Metal hiding electrograving writing reproducing technology is a new problem, does not retrieve the method identical with the application so far.Now provide the one piece of file relevant: CNG5101736A " to utilize tungsten one tungsten-diol complexes 2 dissolution of metals " (invention of U.S. Plastic Specialties ﹠ Technologies, INC) with the technology of the present invention background.This patent is to utilize a solution that contains tungsten one tungsten-diol complexes 2 of sulfuric acid, hydrogen peroxide and catalytic amount to come dissolution of metals, can accelerate the dissolution rate of metal.It mainly is used in produces etch copper in the printed-wiring board (PWB), and it can not make metal hiding electrograving writing manifest.
The chemistry examination and the process for show thereof that the object of the present invention is to provide a kind of metal hiding electrograving writing to reproduce, solve the gun weapon stolen, its numbering destroyed after robbing and exceeds the time limit to use the airplane crash incident that causes with the aviation machine parts and enable the difficult problem that the date numbering is reproduced by metal hiding electrograving writings such as wear and tear, in the hope of admissible evidence and analysis of data are provided.
Writing of the present invention manifests principle:
The electrograving writing is to produce heat energy in the metallic surface with the cremate that electric engraving machine directly discharges to ablate and the vestige of formation, and it changes original metallic gold phase structure.Its metallurgical analysis is shown with the erosion of electrograving machine burning, ablation layer mostly is matrix, is deep to 5～6dmm, uses needle file
Or after other instrument destroyed its marks on surface, though naked eyes cannot see vestige, still remaining with below indenture ablates changed.The present invention utilizes metal ablation place that acid is had higher solidity to corrosion, the principle that not ablated position is then relatively low to sour solidity to corrosion, according to different metals or identical material and the watt level difference of electric engraving machine, its ablation layer deep mixed, select and prepare the chemical reagent of different concns compatibility, and the reagent of being prepared is applied in the mew of metal electrograving writing according to certain method and step, writing is reproduced.Adapted acid-salt mixed solution is smeared electrograving writing mew, purpose is to react with metal ion with acid-salt, changes and intensification metal true qualities, can make anti-corrosion electrograving writing show the light and shade contrast with low relatively resistant metal district, writing just clearly displays, and can fix for a long time.
The metallographic mirror of electrograving writing metal ablated region section is analyzed down:
The metal ablated region generally demonstrates four above levels.With the aircraft al-mg alloy component is sample, and at its ablated surface writing, its ablated region section ecto-entad can be divided into six levels with BW-1 type double colour electro-engraving device (power 50W), that is: ablation zone, 0.55dmm deeply; The incomplete fusion zone, dark 0.8dmm; The annealed zone, dark 1.3dmm, overheated zone, dark 0.3dmm; The recrystallization zone, dark 0.4dmm; And metal matrix tagma.The meter ablation depth is 3.35dmm; Preceding two level metallurgical structures are changed into and are formed new carbide after electrode and the metal function, and third and fourth level is that metallographic structure is subjected to hot-fluid to influence lattice to change, and the 5th, six level metallographic structures do not have considerable change and to normal metal lattice base layer.
The metal hiding electrograving writing of realizing the object of the invention reproduces reagent and process for show:
Bronsted lowry acids and bases bronsted lowry all is corrosion of metal agent.Various acid are in the oxidising process with metal, because its reduction potential difference, according to different samples, the melting concn of selecting different etching reagent and compatibility thereof is the key that writing manifests effect.Its less important selection acid-salt is participated in reaction, changes and deepen the metal true qualities, thereby strengthens the light and shade contrast that writing manifests.The present invention adopts corrosive fluid, staining fluid and three kinds of chemical reagent of stationary liquid, according to various sample, selects different ingredients to prepare and be applied on the sample according to the certain method step, realizes the purpose that metal hiding electrograving writing reproduces.
Below in conjunction with example concrete prescription and the process for show thereof that metal hiding electrograving writing reproduces reagent is described further.
One, reagent:
(1), corrosive fluid: at first being applied on the sample is corrosive fluid.Main chemical reagent is the sour mixed solution that contains the different blended composition and division in a proportion.Need select the mixing acid based on phosphoric acid for 50B steel (as the pistol steel) sample, ratio of mixture was selected between 1: 1～1: 6, and prescription DX-1 is: phosphoric acid 8ml, acetate 2ml, ethanol 10ml; Then need to select mixing acid based on nitric acid for aircraft component, ratio of mixture was selected between 1: 1～3: 1.Prescription DX-2 is: nitric acid 6ml, acetate 4ml, ethanol 10ml.The effective etching time of corrosive fluid was advisable with 3-10 minute.
(2), staining fluid: after corrosive fluid reaches abundant corrosive nature, in order to reach the called after staining fluid of dyeing purpose with metal generation oxidizing reaction.Its chemical reagent composition is for containing acid-salt mixed solutions such as iron(ic) chloride, potassium bichromate, the ratio of mixture of its acid-salt and water is 1: 1～1: 5, the mixed solution ratio that is used for 50B steel (as the pistol steel) sample is lower, and prescription DX-3 is: iron(ic) chloride 2.5g, potassium bichromate 0.2g, water 10ml; The mixed solution ratio of mixture that samples such as the titanium alloy of aircraft component, high temperature alloy adopt is higher, and its prescription DX-4 is: iron(ic) chloride 4g, potassium bichromate 0.3g, water 10ml.Spread staining fluid usually with just showing bright or grey black writing in 5-30 minute.
(3). stationary liquid: above-mentioned manifest finish after, in order to clean or fixedly writing be stationary liquid.Clean liquid such as main selection acetic acid,diluted.50B steel (as the pistol steel) sample also will be coated with 502 transparent adhesive tapes after cleaning, continue oxidation to prevent metal.The aircraft component sample is except that hydronalium, and once cleaning the back writing can keep the long period.
Two. specifically manifest behaviour and do method:
(1), manifest: it is long to manufacture about 15cm, and the bamboo let of 0.3cm thickness is several, is wrapped with the degreasing cotton-wool at bamboo let one end, according to different concealment electrograving writing test buttons, dips in and gets the corresponding corrosive fluid reagent of being prepared then, and smear back and forth and covers at the place at the concealment writing.After corrosive fluid is coated with apparent 3-10 minute, use the same method again to dip in and get staining fluid swab writing place, generally after staining fluid was smeared 5-30 minute, writing promptly obviously displayed.When manifesting when slow, above-mentioned two kinds of test solutions can be hocketed and smear, treat that writing shows after, be coated with again with stationary liquid and clean or fixing.
(2), fixing: as after writing shows,, to proceed to stop oxygenizement with acetic acid,diluted or flushing with clean water sample.According to needing 502 transparent glue of coating to fix, generally can reach the long-time fixedly purpose of writing then.
(3), precaution:
A, manifest reagent so that the time spent is formulated as good;
When b, the mixing of reagent preparation water, must be noted that will add water earlier and then slowly add acid solution, prepare to be placed on and add a cover preservation in the coloured glass bottle:
C, manifest after half an hour if writing does not occur, but the proper extension time.If do not manifest for a long time, should consider promptly whether reagent lost efficacy or surmount the technology limit that the concealment writing manifests.
The present invention has realized the purpose that metal hiding electrograving writing reproduces, reached writing manifest clear, highly sensitive, reagent is easy to preparation, it is easy, economical and practical to manipulate, be not subjected to the envrionment conditions restriction to be convenient to the policeman of basic unit and other people member grasps and effect such as apply.The present invention is on probation through aircraft engine maintenance factory, and writing manifests rate more than 90%.This invention for stolen, robbery part of detection weapon and analysis of aircraft airplane crash incident reason, change mechanical part admissible evidence can be provided.
Claims (6)
1, a kind of metal hiding electrograving writing reproduces reagent, it is characterized in that this reagent by (a), corrosive fluid, is the sour mixed solution that contains the different blended composition and division in a proportion of corrosion electrograving writing place surface oxide layer; (b), staining fluid, promptly in order to reach the aqueous solution that contains iron trichloride and potassium bichromate of dyeing purpose with metal generation oxidizing reaction, (c), stationary liquid, promptly in order to cleaning or the fixedly acetic acid,diluted of writing or the liquid of water, these three kinds of solution compositions, wherein:
(a). corrosive fluid, be in different metals or identical material and the depth difference of the different institutes of the watt level of electric engraving machine ablation layer according to electrograving, select and prepare the sour mixed solution of different sorts and ratio of mixture, (its concrete composition is: contain C0.47～0.55% for the 50B steel, Si0.17～0.37%, Mn0.6～0.9%, B0.0005～0.0035%.) need to select based on phosphoric acid, add and join acetate and alcoholic acid mixed solution, its acid and alcoholic acid ratio of mixture were selected between 1: 1～1: 6, for titanium alloy and high temperature alloy, need to select based on nitric acid, add and join acetate and alcoholic acid mixed solution, acid and alcoholic acid ratio of mixture were selected between 1: 1～3: 1;
(b). staining fluid, the ratio of mixture of its iron trichloride and potassium bichromate and water will be selected between 1: 1～1: 5, and for the 50B steel, its ratio of mixture is lower, and for titanium alloy and high temperature alloy, ratio of mixture is higher;
(c). stationary liquid, mainly select acetic acid,diluted or water liquid, after cleaning, need coating 502 transparent adhesive tapes for the 50B steel.
2, metal hiding electrograving writing according to claim 1 reproduces reagent, it is characterized in that:
A. described (a) corrosive fluid:
(1). for the 50B steel, its corrosion liquid formula is phosphoric acid 8ml, acetate 2ml, ethanol 10ml;
(2). for titanium alloy and high temperature alloy material, its corrosion liquid formula is nitric acid 6ml, acetate 4ml, ethanol 10ml;
B. described (b) staining fluid:
(1). for the 50B steel, its prescription of its dyeing liquor is iron trichloride 2.5g, potassium bichromate 0.2g water 10ml;
(2). for titanium alloy and high temperature alloy material, its prescription of its dyeing liquor is iron trichloride 4g, potassium bichromate 0.3g, water 10ml.
3, a kind of metal hiding electrograving writing reproduces the process for show of reagent, it is characterized in that:
A. manifest: (be about 15cm with bamboo let, diameter 0.3cm) several, end at bamboo let is wrapped with the degreasing cotton-wool, then according to different metal hiding electrograving writing samples, dip in and get the corresponding corrosive fluid of being prepared, the place smears back and forth and covers at concealment electrograving writing, with corrosive fluid be coated with show 3～10 minutes after, use again to dip in and get staining fluid and smear sample concealment electrograving writing place, can show bright or greyish black writing in common 5～30 minutes with quadrat method;
B. fixing: as after writing shows to come, to adopt the flushing of acetic acid,diluted or clear water stationary liquid, then with transparent 502 glue coating.
4, metal hiding electrograving writing according to claim 3 reproduces the process for show of reagent, it is characterized in that: when manifesting when slow, corrosive fluid and two kinds of reagent of staining fluid can be hocketed smears, treat that writing shows after, now be coated with stationary liquid and clean or fixing.
5, metal hiding electrograving writing according to claim 3 reproduces the process for show of reagent, it is characterized in that reproducing reagent so that the time spent is formulated as good.
6, metal hiding electrograving writing according to claim 3 reproduces the process for show of reagent, it is characterized in that smearing corrosive fluid and staining fluid at sample metal hiding electrograving writing place manifests half an hour if writing does not occur, but the proper extension time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91104014A CN1019823B (en) | 1991-06-20 | 1991-06-20 | Metal hiding electrograving writing shows reagent and process for show thereof again |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91104014A CN1019823B (en) | 1991-06-20 | 1991-06-20 | Metal hiding electrograving writing shows reagent and process for show thereof again |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1059764A CN1059764A (en) | 1992-03-25 |
| CN1019823B true CN1019823B (en) | 1992-12-30 |
Family
ID=4906383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91104014A Expired CN1019823B (en) | 1991-06-20 | 1991-06-20 | Metal hiding electrograving writing shows reagent and process for show thereof again |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1019823B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107201518A (en) * | 2017-05-04 | 2017-09-26 | 中国第汽车股份有限公司 | A kind of coat of metal corrosive liquid |
-
1991
- 1991-06-20 CN CN91104014A patent/CN1019823B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1059764A (en) | 1992-03-25 |
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