CN1669722A - Chlorine free soldering flux and its application in bronze historical relics soldering repair - Google Patents
Chlorine free soldering flux and its application in bronze historical relics soldering repair Download PDFInfo
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- CN1669722A CN1669722A CN 200410016987 CN200410016987A CN1669722A CN 1669722 A CN1669722 A CN 1669722A CN 200410016987 CN200410016987 CN 200410016987 CN 200410016987 A CN200410016987 A CN 200410016987A CN 1669722 A CN1669722 A CN 1669722A
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Abstract
This invention discloses a chlorineless soldering flux and its application, belonging to bronze cultural relics restoring realm, with its component in quantity being 8-40% rosin, 1-10% triethanolamine, 1-25% salicylic acid and alcohol as surplus. The chlorineless soldering flux matching Sn-Pb-Ag, has good malleability, is easy to wash off after welding, and solder joint has high intensity, little corrosivity to bronze material, which is quite applied in welding restore of bronze relics.
Description
Technical field
The invention belongs to bronze historical relic and repair the field, relate to a kind of brazing flux, further, the present invention relates to a kind of no chlorine brazing flux and application in bronze historical relic is repaired thereof that bronze historical relic soldering is repaired that can be used for.
Background technology
Brazing flux is commonly called as solder flux in application.Its main effect is to remove brazing metal and the lip-deep oxide-film of liquid solder, and protection brazing metal and solder are not continued oxidation in heating process, to improve solder promotes weld seam to the wetability of body metal surface formation.The fusing point of brazing flux and lowest activity temperature are lower than the fusion temperature of solder slightly.
China has invented the bronze technology of smelting very early, and in Shang Dynasty's late period with enter period of great prosperity of bronze ware the Zhou Dynasty, the last years of a dynasty or reign in the Western Zhou Dynasty and initial stage in spring and autumn have reached its peak.China's all bronze wares of merchant are except having characteristics such as quantity is many, volume is big, the scope of application is wide, and the exquisiteness of its manufacturing technology also is far from other parts of the world and can reaches.The bronze historical relic causes during burying down below owing to be subjected to the erosion of the weight and the various chemical substances of earth because of its metallic character, often all is distortion, broken, incomplete when unearthed.Bronze historical relic in family among the people hides also can cause damage because of natural and man-made calamities.These bronze historical relics that are damaged all will inevitably to a certain degree influence viewing and admiring, study and collecting of people, have only shaping, the process meanses such as making rust that welds, recruits, eliminates rust, paints, could repair into the historical relic that complete Gong people study and collect to them.
The brazing flux that museum's tradition is used contains chlorion, and chlorion is extremely strong to bronze surface corrosion, and its existence has changed the oxidative pathway of copper, has strengthened bronze oxidation potential greatly, has accelerated reaction speed.The existence of chlorion also causes bronze to form the powdery corrosion, can stay corrosion hidden danger to the ancient bronze historical relic after the soldering reparation, is unfavorable for the permanent preservation of historical relic.In addition, electronics industry is used at present exempts to clean brazing flux, though there is not corrosion after the soldering, facts have proved when this brazing flux and solder mate that spreading property is very poor in bronze historical relic repair process, causes soldered fitting formation rosin joint, can not satisfy the requirement of strength of joint.So a kind of novel brazing flux of necessary research, this brazing flux is low to the corrosivity of the bronze cultural artifact surface of Gu, can make solder have good spreadability during soldering, and joint has high intensity after guaranteeing soldering.
Summary of the invention
Technical problem to be solved by this invention is: because brazing flux of the prior art contains chlorion, chlorion is extremely strong to bronze surface corrosion, and its existence has changed the oxidative pathway of copper, has strengthened bronze oxidation potential greatly, has accelerated reaction speed.The existence of chlorion simultaneously also causes bronze to form the powdery corrosion, can stay corrosion hidden danger to the ancient bronze historical relic after the soldering reparation, is unfavorable for the permanent preservation of historical relic.In addition, electronics industry is used at present exempts to clean brazing flux, though there is not corrosion after the soldering, facts have proved when this brazing flux and solder mate that spreading property is very poor in bronze historical relic repair process, causes soldered fitting formation rosin joint, can not satisfy the requirement of strength of joint.So a kind of novel brazing flux of necessary research, this brazing flux is low to the corrosivity of the bronze cultural artifact surface of Gu, can make solder have good spreadability during soldering, and joint has high intensity after guaranteeing soldering.
The present invention contains rosin, triethanolamine, salicylic acid for the technical scheme that above-mentioned technical problem adopted that solves in the prior art provides a kind of no chlorine brazing flux in the described no chlorine brazing flux, wherein, each components contents is as follows by mass percentage:
Rosin 8-40%; Triethanolamine 1-10%; Salicylic acid 1-25%; Surplus is an alcohol.
Further, the prescription of no chlorine brazing flux of the present invention is by mass percentage: rosin 8-40%; Triethanolamine 1-5%; Salicylic acid 1-25%; Surplus is an alcohol.
In the present invention, the solder that is complementary with described brazing flux can be selected from Sn-Pb-Ag.
Technical problem to be solved by this invention also is to provide: the application of no chlorine brazing flux of the present invention in bronze historical relic soldering is repaired.Described no chlorine brazing flux and solder Sn-Pb-Ag are used, can carry out the soldering reparation of bronze historical relic.
Little to the corrosivity of bronze material when bronze historical relic soldering reparation is soldering with the development principle of brazing flux, brazing property is good.Therefore when developing, brazing flux avoids selecting inorganic brazing flux for use and the highly acid brazing flux that has chlorion.Given this, brazing flux of the present invention be with rosin as coverture, the organic acid salicylic acid is as activating agent, the amine triethanolamine is a stripper.
The organic acid activation is important to be the effect that relies on carboxyl, removes the oxide-film on brazing metal and solder surface with the form of metallic soap; And triethanolamine is important ion couplant, can be used as the interaction of ligand and multiple metal ion and generates corresponding couplings or complex compound, to reach the purpose of striping.
No chlorine brazing flux of the present invention mates the Sn-Pb-Ag solder in the bronze historical relic soldering of Gu repair process, has good spreading property, its soldered fitting has very high strength of joint, and it is very little to the corrosivity of bronze material, and the remaining brazing flux of postwelding cleans easily, is specially adapted to the soldering reparation of ancient bronze historical relic.
Description of drawings
Fig. 1 has shown 1#, 2#, 3#, 5# brazing flux has been used for 8 kinds of bronze material, carries out the block diagram of spreadability test.
Fig. 2 has shown the change that bronze material is immersed in the color of different brazing flux medium bronze materials, and wherein, the left side is the result in this immersion of 2# brazing flux, the result of right side for soaking in the 5# brazing flux.
Fig. 3 has shown and has hung in the atmosphere after bronze sample soaked that its surface produces situation of patina among 5# and 2# brazing flux, wherein the left side is the result of soaking in the 5# brazing flux, the result of right side for soaking in the 2# brazing flux.
Fig. 4 shown with 2# brazing flux and 5# brazing flux mate Sn-Pb (Fig. 4 A), Sn-Pb-Ag (Fig. 4 C) respectively, Sn-Pb-Sb (Fig. 4 B) solder carries out soldering, then soldered fitting is carried out the result of tension test.
The bronze relic of a kind of test that Fig. 5 hides for Shanghai Museum of Art and History.
Fig. 6 carries out the brazing property comparative test result for no chlorine brazing flux of the present invention and traditional brazing flux on the bronze relic of Gu.
Fig. 7 is the surface appearance of test specimen behind the traditional zinc chloride brazing flux soldering bronze historical relic relic of employing.
Fig. 8 is the surface appearance of test specimen behind the no chlorine brazing flux soldering bronze historical relic relic of the present invention.
Fig. 9 is the surface appearance of test specimen behind the no chlorine brazing flux soldering bronze historical relic relic of the present invention.
Figure 10 is three sections bronze historical relic relics of test usefulness.
Figure 11 is for grinding off three sections bronze historical relic relics of Figure 10 in the figure behind the oxide on surface.
Figure 12 is grown lacing film corrosion contrast test figure for the bronze historical relic relic of coating no chlorine brazing flux of the present invention and zinc chloride brazing flux respectively soaks.
Figure 13 is grown lacing film corrosion contrast test figure for the bronze historical relic relic of coating no chlorine brazing flux of the present invention and zinc chloride brazing flux respectively soaks.
Figure 14 is that Warring states' bronze mirror of collecting in the Shanghai Museum of Art and History adopts before the no chlorine brazing flux reparation of the present invention and the comparison diagram after repairing.
The preprosthetic photo of bronze rice steamer in late period in the Western Zhou Dynasty that Figure 15 collects for Shanghai Museum of Art and History.
The bronze rice steamer in late period in the Western Zhou Dynasty that Figure 16 collects for Shanghai Museum of Art and History adopts the photo after no chlorine brazing flux of the present invention is repaired.
Figure before merchant's late period that Figure 17 collects for Shanghai Museum of Art and History, beastly face line Fang Ding repaired.
The beastly face line Fang Ding in merchant's late period that Figure 18 collects for Shanghai Museum of Art and History adopts the figure after no chlorine brazing flux of the present invention is repaired.
The specific embodiment
Below in conjunction with the specific embodiment, the present invention is described in further detail, and following example is just as to explanation of the present invention, is not used in to limit the scope of the invention.
The preparation of embodiment 1 1# brazing flux
The 1# brazing flux contains rosin, diethylamine, triethanolamine, and wherein, each components contents is as follows by mass percentage: rosin 23%, and diethylamine 4%, triethanolamine 1%, surplus is an alcohol.At first pour beaker into after with alcohol weighing by mass percentage with balance, subsequently rosin, diethylamine, compounds such as triethanolamine are also progressively put into alcohol by the proportioning weighing, slowly stir simultaneously, allow it fully mix.Brazing flux is promptly prepared and is finished.
The preparation of embodiment 2 2# brazing fluxes
A kind of no chlorine brazing flux of the present invention contains rosin, triethanolamine, salicylic acid, and wherein, each components contents is as follows by mass percentage: rosin 28%, and triethanolamine 1.2%, salicylic acid 2.5%, surplus is an alcohol.At first pour beaker into after with alcohol weighing by mass percentage with balance, subsequently rosin, salicylic acid, compounds such as triethanolamine are also progressively put into alcohol by the proportioning weighing, slowly stir simultaneously, allow it fully mix.Brazing flux is promptly prepared and is finished.
The preparation of embodiment 3 5# tradition zinc chloride brazing flux
The 5# brazing flux is repaired the use brazing flux for museum's tradition, in a reaction vessel, adds the zinc metal sheet of 6.5g, and then adds the hydrochloric acid of 0.2mol 1mol/L, after reacting completely, generates liquor zinci chloridi.Brazing flux is promptly prepared and is finished.
Embodiment 4 spreadability tests
Be numbered 1# among the embodiment 1 and the 2# brazing flux among the embodiment 2, exempt from cleaning-type 3# brazing flux (available from the big China in Shanghai novel brazing flux material factory) simultaneously and embodiment 3 described 5# (the traditional zinc chloride brazing flux in museum) oppose than test.The result of spreadability test as shown in Figure 1.
Adopt 8 kinds of bronze material, described bronze material adopts casting technique manufacturing modelled after an antique, and its composition has comprised most of kind of ancient bronze material.Respectively brazing flux and solder are melted on bronze material, treat that solder solidifies the back and measures its spreading area, the results are shown in Figure 1.
As shown in Figure 1, the spreading area of brazing flux of the present invention on 8 kinds of bronze material is best, and the spreadability of wherein exempting from cleaning-type 3# brazing flux is the poorest, and zinc chloride brazing flux embodiment 3 described 5# brazing fluxes do not have brazing flux spreading property of the present invention good yet.
Bronze material is immersed in embodiment 2 described 2# and the inorganic chlorine ion embodiment 3 described 5# brazing fluxes, through 168 hours, tangible change (shown in the right figure of Fig. 2) has taken place in the color of the bronze material in embodiment 3 described 5# brazing fluxes, and the bronze material surface color no change ((shown in the left figure of Fig. 2) in embodiment 2 described 2# brazing fluxes.
Respectively get and hang over the generation situation of observing surperficial patina in the atmosphere after a slice bronze sample soaks among embodiment 3 described 5# and embodiment 2 described 2# brazing fluxes.Its result is: have tangible verdigris to produce through bronze sample bronze surface within 24 hours that embodiment 3 described 5# brazing fluxes soak; The bronze sample no verdigris within 48 hours that soaks through embodiment 2 described 2# brazing fluxes produces, as shown in Figure 3.Above result shows, embodiment 2 described 2# brazing fluxes do not have corrosion to bronze sample, embodiment 3 described 5# brazing fluxes have the obvious corrosion effect to bronze sample, and embodiment 2 described 2# brazing fluxes are not easy to make the bronze material surface color to change, and whether this point successfully is vital to the soldering reparation of the bronze historical relic of Gu.
The zinc chloride brazing flux embodiment 3 described 5# brazing fluxes that adopt embodiments of the invention 2 described 2# brazing fluxes and use always mate Sn-Pb, Sn-Pb-Ag respectively, the Sn-Pb-Sb solder carries out soldering, then soldered fitting is carried out tension test, strength of joint when the investigation use is of the present invention, result of the test is seen Fig. 4.
As shown in Figure 4, adopt brazing flux of the present invention, the intensity of joint is higher relatively.
A. iron soldering contrast
Some relatively typical cases's (as shown in Figure 5) in the bronze relic that Shanghai Museum of Art and History is hidden, have been selected, use the plumbous silver solder of traditional zinc chloride brazing flux and tin-lead solder and novel no chlorine brazing flux and tin respectively, use original iron soldering restorative procedure on the bronze relic of Gu, to carry out the brazing property contrast.
As shown in Figure 6, from the flatiron welding result, novel no chlorine brazing flux and traditional zinc chloride are in welding process, and the flowability of solder all shows well, and operating handle and solder setting time do not have evident difference yet.But solder connector keeps light after the soldering of novel no chlorine brazing flux, and after traditional zinc chloride soldering obviously turn black in the solder connector both sides.
B. the alternation after the soldering adds wet test
Bronze historical relic relic after the soldering is with reference to GB2423.4-81 cyclic damp heat test method (40 ℃-25 ℃), and relative humidity＞95% is tested viewing test sample surfaces situation after 24 hours.As seen adopt the weld seam of traditional zinc chloride brazing flux (label 5# brazing flux) to generate many flocculent substances on every side from Fig. 7.And the weld seam that adopts novel no chlorine brazing flux (label embodiment 2 described 2# brazing fluxes) does not occur oxidation on every side and generates other material.After ESEM and energy spectrum analysis.
By Fig. 8, Fig. 9 as can be known, the weld seam of novel no chlorine brazing flux and mother metal decompose very obvious, and intersection does not have newborn substance; The weld seam of zinc chloride brazing flux is then not obvious with the mother metal boundary, and intersection has generated many flocculent substances.
Further butt welded seam carries out the power spectrum chemical structure analysis, is analyzed as follows table:
Adopt novel no chlorine brazing flux (2# brazing flux)
| ??Cu | ??Sn | ??Pb | ?O | ?C | ??Fe | ??Cl | ??Si | ??Al | |
| Weld seam and mother metal intersection | ??28.13 | ??40..96 | ??12.60 | ?8..24 | ?10.07 | ||||
| Alloy substrate | ??54..95 | ??34..34 | ??10.71 |
Adopt traditional zinc chloride brazing flux (5# brazing flux)
| ??Cu | ??Sn | ??Pb | ??O | ??C | ??Fe | ??Cl | ??Si | ??Al | |
| Weld seam and mother metal intersection | ??34.15 | ??22.18 | ??9..39 | ??12..91 | ??18..90 | ??1..57 | ??0.89 | ||
| Alloy substrate | ??43.68 | ??26.10 | ??5.75 | ??10..20 | ??14.27 |
From table, as can be known, do not have Cl, but adopt traditional zinc chloride brazing flux to have higher Cl to exist with the weld seam and the mother metal junction of the soldering of novel no chlorine brazing flux.As for elements such as Cu, O, C then may be solder and mother metal effect and the compound of a small amount of Cu of generating.More at traditional zinc chloride brazing flux and these compounds of alloy bond place, be the compound of Cu, Sn basically, also have the compound of a spot of Fe, Si, Al.
C. bronze historical relic relic soaks grows lacing film corrosion contrast test
It is three sections (shown in Figure 10) that a bronze historical relic relic is cut out, grind off oxide on surface (as shown in figure 11), wherein one is not coated with brazing flux, coats novel no chlorine brazing flux and traditional zinc chloride brazing flux respectively with all the other two, is placed on the surface of observing these lacing films under the normal temperature then and changes.
The result: by Figure 12, Figure 13 as can be known, the obvious corrosion phenomenon just appears in the lacing film of coating the zinc chloride brazing flux after 24 hours, and along with the prolongation of time corrosion is on the rise, and the lacing film that is coated with the lacing film of novel no chlorine brazing flux and is not coated with brazing flux does not all have any significant change.
The practical situations of embodiment 8 the present invention when bronze historical relic is repaired
We have selected several more typical collection bronze historical relics respectively, with traditional iron soldering method the present invention are carried out braze ability and investigate.
A. Warring states' bronze mirror is repaired:
As shown in figure 14, Warring states' bronze mirror (collection numbering: 69478) repair time (2003/3/3-2003/3/15)
Circle, diameter 14cm weighs 185 grams, intermediate thin, the edge is about the plain crimping of 0.3cm, the mirror back of the body is put the trichord button, adorn ten in to company's arc line.Before repairing this piece bronze mirror broken be five, this face bronze mirror fracture is neat as can be seen from its section, has splendid copper.
Brazing process: at first be the corrosion thing of fragment being removed the bronze mirror incision position, make the minute surface soldering of bronze mirror smooth, must be through spot welding fixing bronze mirror fragment temporarily, to select suitable pad before the spot welding, put solder and brazing flux (2#) in the commissure, adjust the position of bronze mirror fragment it is convinced by melting solder repeatedly then, just can carry out the integral solder of positive and negative, intact up to whole welderings, the soldering end-of-job of bronze mirror.
Conclusion: solder is mobile fine during integral solder, and the solder in the brazed seam is smooth smooth, does not have to overflow and packing phenomenon, and the brazing flux of weld seam both sides does not have yet and anyly splashes and corrode.Solder still keeps higher activity through melting novel no chlorine brazing flux repeatedly, has good welding procedure.So far the bronze mirror weld seam is still bright, and the weld seam both sides do not have bad reaction.
B. bronze rice steamer reparation in late period in the Western Zhou Dynasty
Late period in Western Zhou Dynasty bronze rice steamer (collection numbering: 48088) repair time (2003/3/3-2003/3/15)
Rice steamer is formed a kind of bronze steaming device-- that cooks a meal as separating of the combination the first half of bronze ware and the latter half.Though rice steamer is used to place food, it uses more extensive as the practicality feeder of preparing food.The logical high 24.2cm of this part bronze rice steamer, bore 32cm, wasteful mouthful, the bundle neck, crect ear is held back abdomen, and is flat, on cross and radiation hole grate are arranged.The necklace dragon design, abdomen decorations ripple Qu Wen.Surplus this device is broken into ten before repairing piece (as shown in figure 15), and fragment generally all is out of shape, and the surperficial entire body of implements is wrapped in the yellow green oxide, section also because of of the remote past corrode smudgy.Fragment is right through preliminary assembly, and fragment gave orthopedic processing before at first will advancing to weld, but still has the high infraversion malposition of slight weld seam because of distortion can't normally connect, and correct by welding sled pressure.Constituent analysis the results are shown in as can be known that copper accounts for 68.44 plumbous 23.37% tin, 7.16% iron, 0.95% in the implements matrix, belongs to slicker solder copper.Solder fine and very easily control in the guiding current downflow of flatiron and brazing flux (2#) does not have pungent smell in practical operation.The solder cools time after the welding and the hand feel strength of implements and the former no significant difference.
As shown in figure 16, the bronze rice steamer after the soldering is placed half a year under normal temperature laboratory after, bronze rice steamer soldered fitting does not have sealing-off is not had corrosion, and the brightness of solder still maintains the original state, and has this visible soldered fitting that enough intensity and resistance to corrosion are arranged.
C. discuss beastly face line Fang Ding reparation in late period
As shown in figure 17, ancient cooking vessel is a kind of feeder of preparing food, and is type and all comparatively typical implements of alloy content in the bronze ware.The high 25.4cm of this ancient cooking vessel, mouthful long 20cm, a mouthful wide 15.2cm weighs, the outer folding in mouthful edge, two crect ears, directly abdomen is flat, four posts foot, mouth is along adoring dragon design down, and stomach wall is adornd beastly face line.But this side's ancient cooking vessel one foot and the fracture of ancient cooking vessel body, disconnected lumping weight 485 grams, fracture place is a diameter 28mm annular, wall thickness 2.5mm.This is the example test of the firm degree of joint after its soldering of investigation.Adopt the soldering of combination bevel V groove.The legs of the tripod after the welding is very firm, or even only mentions whole implements by a foot, does not also have the meaning that at all shakes.
Claims (5)
1. a no chlorine brazing flux is characterized in that, contains rosin, triethanolamine, salicylic acid in the described no chlorine brazing flux, and wherein, each components contents is as follows by mass percentage:
Rosin 8-40%;
Triethanolamine 1-10%;
Salicylic acid 1-25%;
Surplus is an alcohol.
2. no chlorine brazing flux according to claim 1 is characterized in that the prescription of described brazing flux is by mass percentage:
Rosin 8-40%;
Triethanolamine 1-5%;
Salicylic acid 1-25%;
Surplus is an alcohol.
3. no chlorine brazing flux according to claim 1 and 2 is characterized in that the solder that is complementary with described brazing flux is selected from the Sn-Pb-Ag material.
4. claim 1 or the 2 described no chlorine brazing fluxes application in bronze historical relic soldering is repaired.
5. the application of no chlorine brazing flux according to claim 4 in bronze historical relic soldering is repaired is characterized in that, described no chlorine brazing flux and solder Sn-Pb-Ag coupling are used, and carries out the soldering reparation of bronze historical relic.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100169872A CN1318182C (en) | 2004-03-17 | 2004-03-17 | Chlorine free soldering flux and its application in bronze historical relics soldering repair |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100169872A CN1318182C (en) | 2004-03-17 | 2004-03-17 | Chlorine free soldering flux and its application in bronze historical relics soldering repair |
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| CN1669722A true CN1669722A (en) | 2005-09-21 |
| CN1318182C CN1318182C (en) | 2007-05-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425385C (en) * | 2006-10-27 | 2008-10-15 | 烟台德邦科技有限公司 | Leadless solder paste and its preparation method |
| CN102554511A (en) * | 2011-12-22 | 2012-07-11 | 肇庆理士电源技术有限公司 | Novel soldering flux |
| CN104646864A (en) * | 2014-12-17 | 2015-05-27 | 安徽华东光电技术研究所 | Activated liquid scaling powder and preparation method and application thereof |
| CN106216886A (en) * | 2016-08-04 | 2016-12-14 | 上海交通大学 | A kind of brazing flux without chloride ion for priming system copper alloy Yu nichrome wire soldering |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2516373B2 (en) * | 1987-07-29 | 1996-07-24 | タツタ電線株式会社 | Composition for soldering lead wire to aluminum plate |
| KR930008294B1 (en) * | 1991-01-09 | 1993-08-27 | 주식회사 주한산업 | Welding agent making method |
| US5196070A (en) * | 1991-12-31 | 1993-03-23 | International Business Machines Corporation | Thermally stable water soluble solder flux and paste |
| CN1042809C (en) * | 1994-04-06 | 1999-04-07 | 化学工业部晨光化工研究院成都分院 | Non-halogen non-rosin type low solid content non-cleaning scaling powder |
| CN1033691C (en) * | 1994-04-13 | 1997-01-01 | 周俊治 | Neutral scaling powder for soldering tin core |
-
2004
- 2004-03-17 CN CNB2004100169872A patent/CN1318182C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425385C (en) * | 2006-10-27 | 2008-10-15 | 烟台德邦科技有限公司 | Leadless solder paste and its preparation method |
| CN102554511A (en) * | 2011-12-22 | 2012-07-11 | 肇庆理士电源技术有限公司 | Novel soldering flux |
| CN104646864A (en) * | 2014-12-17 | 2015-05-27 | 安徽华东光电技术研究所 | Activated liquid scaling powder and preparation method and application thereof |
| CN106216886A (en) * | 2016-08-04 | 2016-12-14 | 上海交通大学 | A kind of brazing flux without chloride ion for priming system copper alloy Yu nichrome wire soldering |
| CN106216886B (en) * | 2016-08-04 | 2018-09-14 | 上海交通大学 | It is a kind of to be used for priming system copper alloy with nichrome wire soldering without chlorion brazing flux |
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| CN1318182C (en) | 2007-05-30 |
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Granted publication date: 20070530 |