CN102051500A - Corrosion resistant copper alloy pipe for air conditioning and refrigeration - Google Patents
Corrosion resistant copper alloy pipe for air conditioning and refrigeration Download PDFInfo
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Abstract
The invention provides a copper alloy pipe for air conditioning and refrigeration, in particular to a copper alloy pipe which resists the formicary corrosion and can be used for the condenser, the evaporator and the heat exchanger. The copper alloy pipe provided by the invention comprises the following components by weight percent: 0.1-1.5% of Mn, 0.015-0.04% of P, 0.001-0.1% of rare earth metal mixture and the balance of Cu and inevitable impurities; and the average grain size is 0.005-0.030mm. The copper alloy pipe can also contain 0.005-0.015% of B. Through the corrosion electrochemical measurement, the current density of the copper alloy in the invention is over 10% less than the current density icrro of TP2. In the atmosphere of carboxylic acid, a passive film with compact structure and uniform thickness can be formed on the surface of the copper alloy pipe to prevent carboxylic groups from spreading in copper; and the requirements of the copper pipe for air conditioning and refrigeration can be satisfied. The surface oxidation film has the advantages of compact structure, uniform thickness, high thermal conductivity and good machinability and solderability. The copper alloy pipe can satisfy the requirements of the copper pipe for air conditioning and refrigeration and have good formicary corrosion resistance.
Description
Technical field
The present invention relates to a kind of air-conditioning and cooling copper alloy tube, particularly a kind of anti-ant cave corrosive is used for the copper alloy tube of condenser, vaporizer and heat exchanger.
Background technology
Because dephosphorization oxygen copper (TP2) has high thermal conductivity, solidity to corrosion, good processibility and weldability, and have biocidal property and beautiful gloss, so dephosphorization oxygen copper pipe is widely used in heat exchanger material and refrigerator pipes.(human consumer increases gradually about the complaint quantity that the ACR device lost efficacy in advance for Air-Condition and Refrigeration Field Service, ACR) production and widespread use on a large scale but along with air-conditioning refrigeration plant.Further investigation is found, closely to shift to an earlier date failure reasons be the corrosion of ant cave to the ACR device of half.
The corrosion of ant cave is to be different from copper and the common form of corrosion (spot corrosion, stress corrosion, atomospheric corrosion, corrosion fatigue etc.) of copper alloy, it is a kind of after air-conditioning refrigeration plant uses 2 to 3 months, or even the corrosion that is similar to spot corrosion that takes place when after refrigeration plant is installed, carrying out pressure test leak-detecting detection or degreasing and punching test, cause the premature failure of refrigeration plant.It with the naked eye be can't see, and just can see mazy interconnecting channel of its inside in the time of can only adopting its transverse section of observation by light microscope, and the pin hole as the cave of ant penetrates the copper pipe wall, and loose Red copper oxide is arranged in the passage, so be named as the corrosion of ant cave.
Usually, ant cave corrosion mainly be by produce dephosphorization oxygen copper pipe and the used synthetic lubricating oil of dephosphorization oxygen copper pipe punching course and produce dephosphorization oxygen copper pipe and during the assembling refrigeration plant degreasing and the degradation production that cleans used chlorine-containing compound cause, and think that these degradation productions are carboxyl acids, decompose and get by chlorine-containing compound or lubricating oil and oxygen and water generation chemical reaction.Copper pipe soldering simultaneously is that volatile organic compounds, foam thermal insulation layer (sealing tape) perfume, makeup, seasonings, medicament and the sterilant decomposition generation carboxyl acid that used soldering flux, refrigerant condenser oil, timber and artificial building materials are emitted also can make dephosphorization oxygen copper pipe that the corrosion of ant cave takes place.Refrigeration plant uses in containing carboxylic acid environment such as formic acid, acetate in addition, and copper pipe tends to thin-walled property, pathization and come controlled temperature and interior humidity also may cause the ant cave in operation hot, that wet area increases the ACR device corrode.
Studies show that according to ant cave Corrosion Mechanism air-conditioning and cooling copper pipe produce ant cave corrosive condition except above-mentioned corrosives, and the existence of water and oxygen also must be arranged.Prevention ant cave corrosive measure at present mainly concentrates on any one of removing above-mentioned factor and delays or stops ant cave corrosive to take place, and reaches as the residual and hydrolysis of materials such as prevention clean-out system, volatile oil and soldering flux copper pipe is carried out surfacecti proteon.But above-mentioned measure all has defective separately, therefore need improve the anti-ant cave corrosive power of copper pipe self by add micro-metals in the copper pipe material.
Current, dephosphorization oxygen copper is the general air conditioner refrigerating copper pipe material in the whole world, and it contacts with atmosphere and forms one deck Cu
2The O film contains a spot of CuO simultaneously, because Cu
2O is a metal deficiency oxide compound, causes carboxylic acid to be easy to pass this oxide film, causes the corrosion of ant cave.And raw material is impure in fusion-casting process, causes non-metallic inclusion to remain in the dephosphorization oxygen copper, causes the passive film of copper pipe surface inhomogeneous, and the passive film of inclusion place weakness just becomes generation ant cave corrosive starting point.
Therefore, select to add the proper metal element and make copper pipe surface oxide film dense structure, thickness even, become the purpose that improves the anti-ant of copper pipe self cave corrosive power.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of anti-ant cave corrosive nature good copper alloy tube.
Technical scheme
1. an air-conditioning and cooling copper alloy tube that anti-ant cave corrosive nature is good, it is characterized in that, contain Mn:0.1～1.5wt%, P:0.015～0.04, norium: 0.001～0.1wt%, surplus is Cu and unavoidable impurities, and mean grain size is 0.005～0.030mm.
2. according to project 1 described anti-ant cave corrosive copper alloy tube, it is characterized in that described copper alloy also contains B:0.005～0.015wt%.
3. according to project 1～2 each described anti-ant cave corrosive copper alloy tube, it is characterized in that, described copper alloy also contain be selected from Sn, Fe, Co, Mg, Ni, Cr, Ti, and Zr among one or more element, the total content of these elements is lower than 0.1wt%.
4. according to project 1～3 described anti-ant cave corrosive copper alloy tube, it is characterized in that described copper alloy is by electrochemical corrosion measurement, the current density i of its current density ratio TP2
CrroLittle more than 10%.
" corrosion of ant cave " is the galvanic corrosion of similar spot corrosion among the present invention, and the taper of microchannel is a copper generation dissolved microcosmic anode, and the sidewall of microchannel and outer tube surface are oxygen generation reductive microcosmic negative electrodes.Therefore by the electrochemical corrosion measurement method, study the ant cave corrosion behavior and the solidity to corrosion thereof of copper alloy tube.
The present invention by electrochemical corrosion measurement, measures parameter---the current density i of copper alloy surface unit surface electrochemical reaction rates
CrroThe current density of copper alloy is more little, and anti-ant cave corrosive nature is high more.
The electrochemical corrosion measurement method is as follows:
Is 1cm with the line cutting from waiting that testing style cuts pat, being machined into surface-area
2Square electrode, polishing all around, and connect copper wire lead-in wire gets up to make working electrode carrying out encapsulation with Resins, epoxy silica gel.After electrode surface polishes with abrasive paper for metallograph, and use the acetone degrease, the redistilled water flushing, dry back is standby.
The present invention adopts three-electrode system, and the research electrode is a copper alloy, and supporting electrode is a platinum electrode, and reference electrode is the Ag/AgCl electrode.Electrolytic solution is 1% formic acid solution, during the potential electrode polarization curve, gets anode to linear sweep voltammetry, and sweep velocity is 100mV/s, and sweep limit is-0.5V～2V.TL07-LK98C electro-chemical test system is adopted in this experiment.
Constituting air-conditioning of the present invention is described as follows with each element limited range and the reason that become to be grouped into of cooling copper alloy tube:
Mn：0.1～3wt％
In fine copper, add the Mn element and can improve air-conditioning and the anti-ant of cooling copper alloy tube cave corrosive power.When Mn content was lower than 0.1wt%, the anti-ant cave corrosive nature of copper alloy tube was not obvious; Increase along with the Mn add-on, the mechanical property of copper alloy tube and anti-ant cave corrosive nature are high more, when Mn content greater than 3% the time, the anti-ant cave corrosive nature of copper alloy tube is tending towards identical, and the surface oxidation of copper alloy tube increases, processing characteristics and processing performance descend, and brings very big difficulty for the processing of air-conditioning and cooling tubing.
P：0.015～0.04wt％
During melting, P is added as the reductor of copper copper alloy in air atmosphere.The interpolation of P has improved the flowability of copper melts.P contains quantity not sufficient 0.015wt% makes copper alloy cause oxygen level to increase the oxide compound that produces P because of the deficiency of reductor, and the copper alloy compactness under the as cast condition reduces, crystal grain is thick, processing characteristics reduces; When P content surpassed 0.04wt%, P was tending towards identical to the above-mentioned impact effect of described copper alloy, and P reach certain content after the copper alloy thermal conductivity descend.
Norium 0.001～0.1wt%.
In copper, add the thulium of proper content, refinement crystal grain, strengthened crystal boundary, improved the tensile strength of copper alloy.Promptly purify simultaneously and reduced the bad property of the danger of harmful element effect in the copper alloy, remove again and reduced the danger bad property of non-metallic inclusion in solid-state copper alloy, and suitably add solidity to corrosion and anti-localized attack tendency that thulium can obviously improve.During thulium deficiency 0.001wt%, the anti-ant cave corrosive nature of copper alloy tube is not obvious, and thulium does not have above-mentioned effect yet simultaneously; When thulium surpasses 0.1wt%, the effect that rare earth element can not play crystal grain thinning has worsened tissue on the contrary, and tensile strength descends on the contrary.And thulium becomes alloying element, with the second phase form exist with matrix in, simultaneously the anti-ant of the copper alloy cave corrosive nature of this moment and thermal conductivity descend.
B：0.005～0.015wt％
In copper, add an amount of B, energy refinement copper crystal grain, can promote the growth of copper alloy rete, and then improved the anti-ant of copper alloy cave corrodibility, and can improve the mechanical property and the processing performance of copper, the interpolation of an amount of in addition B can reduce the wearing and tearing that mould is used in horizontal casting, rolling, stretching, roll forming etc., helps the reduction of production cost.When B contained quantity not sufficient 0.005wt%, copper alloy did not reach above-mentioned effect; When B content surpassed 0.015wt%, B was tending towards identical to the above-mentioned impact effect of described copper alloy.
Be selected from Sn, Fe, Co, Mg, Ni, Cr, Ti, and Zr among one or more element.The total content of these elements is lower than 0.1wt%.
Sn, Fe, Co, Mg, Ni, Cr, Ti, and Zr among one or more element, be distributed in the copper matrix with copper matrix formation sosoloid or disperse, play crystal grain thinning, improved the effect of copper alloy tensile strength, the interpolation of hybrid metal simultaneously can promote the growth of copper alloy rete, and then has improved the raising of the anti-ant of copper alloy cave corrosive nature.The hybrid metal amount was greater than 0.1% o'clock, and the anti-ant cave corrosive nature of copper alloy tube is tending towards identical, and the surface oxidation of copper alloy tube increases, processing characteristics and processing performance descend, and brought very big difficulty for the processing of air-conditioning and cooling tubing.
The copper alloy tube preparation method
Air-conditioning of the present invention and cooling copper alloy tube can be made by usual method, and the copper alloy tube that uses elemental range provided by the invention to obtain can form one deck dense structure, the uniform oxide film of thickness on its surface.Then, be that example describes to the preparation method of copper alloy tube of the present invention with the situation of rifled tube, its concrete preparation technology is as follows:
At first with low melting point metal and refractory metal by certain rule smelting furnace of packing into, concrete operations are: graphite flake is put into the core-type induction furnace furnace bottom, add the electrolysis copper coin then, adopt the low power heat temperature raising, after treating the copper fusing, add the deoxidation of P-Cu alloy, add the graphite flake after the oven dry afterwards again, be as the criterion with show not; After body temperature degree fusion reaches 1150～1200 ℃, add the P-Cu alloy and carry out the secondary deoxidation, and add Mn, mishmetal rapidly, heat up rapidly then, be incubated about 30min-1h down at 1200-1300 ℃; After treating that alloy fully dissolves, topple over smelting furnace the copper alloy liquid that dissolves is flow in the holding furnace through airtight chute, will before pouring into, pour nitrogen protection continuously by 3-4min in the airtight chute, close after turndown is intact; Treat that turndown finishes, after the holding furnace melt reached rising of setting and leads temperature 1180-1200 ℃, insulation 1-2h had induction stirring horizontal casting system to involve copper alloy open tube strand then, and normally drawing holding temperature is 1150-1180 ℃.Secondly copper alloy open tube strand is carried out three-roller planetary and revolve and roll, again through associating drawing and disk drawing, at the pure N of roller bottom type bright annealing oven
2Carry out (500-650 ℃) * (30-60min) process annealing operation under the atmosphere and make air-conditioning and cooling copper alloy tube work in-process.At last air-conditioning and cooling copper alloy tube work in-process are made seamless inner screw thread copper pipe through the ball spinning technology, at the pure N of roller bottom type bright annealing oven
2Carry out (400-550 ℃) * (30-60min) under the atmosphere and eliminate internal stress, obtain air-conditioning and cooling seamless inner screw thread copper pipe.
As seen from the above, the present invention adds an amount of Mn, P, mixed rare-earth elements in fine copper, and control Fe, Co, Mg, Ni, Cr, Ti, B, Sn, Zr in right amount, can in carboxylic acid or carboxylic acid atmosphere, make the copper alloy tube surface form one deck dense structure, the diffusion of the uniform passive film obstruction carboxylate radical of thickness in copper, and can satisfy the requirement of air-conditioning and cooling copper pipe.Its surface film oxide dense structure, thickness are even, and have high thermal conductivity, good processibility and weldability.Described copper alloy tube can satisfy the requirement of air-conditioning and cooling copper pipe, has good anti-ant cave corrosive nature again.
Description of drawings
Fig. 1 is that Experimental equipment is reproduced in the corrosion of copper pipe ant cave;
Fig. 2 is the anodic polarization curves figure of example 7, example 12, Comparative Examples TP2.
Embodiment
The invention provides good air-conditioning of anti-ant cave corrosive nature and cooling copper alloy tube.With respect to the existing dephosphorization oxygen copper that is used to make air-conditioning and cooling copper alloy tube, described copper alloy tube has stronger anti-ant cave corrosive nature.Therefore, again " corrosion of anti-ant cave " of this use refer to anti-ant cave corrodibility enhanced degree, for the existing dephosphorization oxygen copper that is used to make air-conditioning and cooling copper alloy tube.
The present invention will be further described in detail below in conjunction with embodiment.The present invention utilizes the microalloying principle, with copper is matrix, by adding suitable micro-metals, makes it effectively forming one deck dense structure, the uniform oxide film of thickness on the copper alloy tube surface, hinder the diffusion of carboxylic acid in copper, thereby improve the anti-ant cave corrosive nature of copper alloy.
The preparation method and the detection method of embodiment 1 air-conditioning and cooling seamless inner screw thread copper pipe.
The copper alloy tube that uses in the embodiment of the invention prepares raw material and is electrolysis copper coin and pure Mn sheet, adopts technologies such as preparation technology rolls for induction stirring horizontal casting, three-roller planetary commonly used in this area revolve, associating drawing, disk stretching, process annealing, ball spinning forming internal threads, level winding, final annealing.
The metal group of copper alloy tube becomes shown in the table 1, contains Mn:0.1～1.5wt%, P:0.015～0.04wt%, and norium: 0.001～0.1wt%, surplus is Cu and unavoidable impurities, and mean grain size is 0.005～0.030mm.Copper alloy can also contain B:0.005～0.015wt%.Described copper alloy can also contain be selected from Sn, Fe, Co, Mg, Ni, Cr, Ti, and Zr among a kind of or two or more element arbitrarily, the total content of these elements is lower than 0.1wt%.
Concrete operations are as follows: graphite flake is put into the core-type induction furnace furnace bottom, add the electrolysis copper coin then, adopt the low power heat temperature raising, treat to add after the copper fusing graphite flake after the oven dry again, be as the criterion with show not; After body temperature degree fusion reaches 1150～1200 ℃, and add pure Mn sheet, mishmetal rapidly, heat up rapidly then, be incubated about 30min-1h down at 1200-1300 ℃; After treating that alloy fully melts, topple over smelting furnace the fused copper alloy liquid is flow in the holding furnace through airtight chute, will before pouring into, pour nitrogen protection continuously by 3-4min in the airtight chute, close after turndown is intact; Treat that turndown finishes, after the holding furnace melt reaches rising of setting and leads temperature 1180-1200 ℃, insulation 1-2h, having induction stirring horizontal casting system to involve specification then is that external diameter is
Internal diameter is
Length is the hollow strand of 13m, and normally drawing holding temperature is 1150-1180 ℃.Secondly copper alloy open tube strand is carried out three-roller planetary and revolve and roll, make specification through associating drawing and disk drawing again and be
Light face copper pipe.At the pure N of roller bottom type bright annealing oven
2Carry out (500-650 ℃) * (30-60min) process annealing operation under the atmosphere and make air-conditioning and cooling copper alloy tube work in-process.At last air-conditioning and cooling copper alloy tube work in-process being made specification through the ball spinning technology is
State is the seamless inner screw thread copper pipe of light and soft attitude, at the pure N of roller bottom type bright annealing oven
2Carry out (400-550 ℃) * (30-60min) under the atmosphere and eliminate internal stress, obtain air-conditioning and cooling seamless inner screw thread copper pipe.Adopt electronic universal material testing machine to detect the copper alloy tube mechanical property, utilize the Axioert200MAT inverted metallurgic microscope to observe the microtexture of production tube.Estimate its mechanical property and processing performance according to GB/T 17791-1999.
Corrosion reproduction experiment of embodiment ant cave and evaluation method are as described below.The copper alloy tube that sample tubes adopts aforesaid method to produce, each sample tubes length is 100mm, and the air-conditioning and the cooling seamless inner screw thread copper pipe that with the material are TP2 are as control sample, and the employing same process is produced.Concrete test method is as follows: sample being placed on internal diameter 12mm, in the glass test tube of long 105mm, tiltedly being placed on together in 1 liter the sealed glass jars, bottom the vial is 1% aqueous formic acid for the 100ml volumetric concentration, and substitution gas is an air, as shown in Figure 1.With the vial bottleneck that installs corrosive fluid and copper pipe airtight after, be positioned over the alternately insulation of doing in the thermostat container 40/20 ℃ * 12 hours, routine observation also writes down copper pipe surface variable color situation.After corroding about 15 days, the sample pipe of heterogeneity was respectively got one every 5 days, and the copper sample is cut into ring-type, inlayed with Resins, epoxy, and the transverse section is observed in the polishing back under the Axioert200MAT inverted metallurgic microscope, checked ant cave corrosion situation occurred.Embodiment sample pipe is good more through the corrosion post-etching degree of depth more little anti-ant cave corrosive nature, and with after corroding about 30 days, and depth of corrosion is anti-ant cave corrosive nature good of standard evaluation copper alloy tube less than 0.12mm.
Copper alloy chemistry component is as shown in table 1, and example 1～15 copper alloy chemistry compositional range is that following table 1 is described, and Comparative Examples content is following table 1 described copper alloy:
Table 1 copper alloy chemistry composition
The result of corrosion test is as shown in table 2:
Table 2 is exposed to the maximum corrosion depth of the copper alloy tube of formic acid atmosphere
The copper alloy tube assessment of performance is as shown in table 3:
The assessment of performance of table 3 copper alloy tube
Annotate: ● maximum corrosion depth is less than 0.12mm; The ◎ maximum corrosion depth is greater than 0.12mm; Zero expression mechanical property or processing performance are good; * expression mechanical property or processing performance are poor.
The result of table 2, table 3 shows that the grain fineness number of the copper alloy tube of example is all at 0.015～0.03mm, and in addition, the present invention measures parameter---the current density i of copper alloy face unit surface electrochemical reaction rates by electrochemical corrosion measurement
CrroThe current density of copper alloy is more little, and anti-ant cave corrosive nature is high more.Table 3 as can be known, the current density of the current density ratio TP2 of example is little more than 10%, illustrates that the anti-ant cave corrosive nature of example improves.
And the ant cave depth of corrosion of example proves also that less than 0.12mm the anti-ant cave corrosive nature of example is good, and example has good processing properties and processing performance.
And for example shown in Figure 2, therefore the current density of example 12 and example 7, can prove that the copper alloy tube of example of the present invention has higher anti-ant cave corrosive nature far below the current density of TP2.
The result of table 2, table 3 shows that Comparative Examples 16,17 copper alloys chemistry composition includes only micro-Mn element, and its oxygen level increases, Mn element skewness, and grain-size is not of uniform size.Though still have anti-ant cave corrosive nature, their anticorrosion effect is poor than example 3,4.Cause like this under the identical situation of anticorrosion effect, include only the copper alloy tube of micro-Mn element,, reduced production efficiency far and away and increased production cost with respect to the described copper alloy tube of embodiment.
Comparative Examples 18, the content of Mn is very few and less than lower limit, though in preferable preparation technique scope of the present invention, grain fineness number in 0.015～0.03mm, the anti-ant cave corrosive nature and the bad mechanical property of copper alloy.
Comparative Examples 19, the content of Mn too much and exceed the upper limit, though in preferable preparation technique scope of the present invention, grain fineness number in 0.015～0.03mm and anti-ant cave corrosive nature good, but the processing performance of the copper alloy of described this Comparative Examples is poor, brings very big difficulty for the processing of air-conditioning and cooling tubing.
Comparative Examples 20,21, P, mishmetal content are too much, and exceed the upper limit, though in preferable preparation technique scope of the present invention, grain fineness number is at 0.015～0.03mm, but the anti-ant cave corrosive nature of described copper alloy tube is starkly lower than example, and processing performance is poor, brings very big difficulty for the processing of air-conditioning and cooling tubing.
Comparative Examples 22,23, Sn, Fe, Co, Mg, Ni, Cr, Ti, and Zr among one or more and B content too much and surpass the upper limit, though in the preferable preparation technique scope of claim, grain fineness number is in 0.015～0.03mm, and the anti-ant cave corrosive nature excellence of copper alloy, but the mechanical property of copper alloy or processing performance are poor, bring very big difficulty for the processing of air-conditioning and cooling tubing.
Comparative Examples 24, this Comparative Examples are that the general material in the whole world is the air conditioner refrigerating copper pipe of dephosphorization oxygen copper, and its grain fineness number and has good processing properties and processing performance in 0.015～0.03mm, but its anti-ant cave corrosive nature is poor.
In sum, the present invention is matrix with copper, add an amount of micro-metals, form one deck dense structure, the uniform oxide film of thickness on the copper alloy tube surface with being effective, hinder the diffusion of carboxylic acid in copper, thereby improve the anti-ant cave corrosive nature of copper alloy, and copper alloy have favorable mechanical performance and processing performance.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a corrosion-resistant air-conditioning and cooling copper alloy tube is characterized in that, contain Mn:0.1～1.5wt%, P:0.015～0.04wt%, norium: 0.001～0.1wt%, surplus is Cu and unavoidable impurities, and mean grain size is 0.005～0.030mm.
2. copper alloy tube according to claim 1 is characterized in that described copper alloy also contains B:0.005～0.015wt%.
3. copper alloy tube according to claim 1 is characterized in that, contains Mn:0.1～1.5wt%, P:0.017～0.035wt%, norium: 0.013～0.09wt%, surplus is Cu and unavoidable impurities, and mean grain size is 0.010～0.025mm.
4. copper alloy tube according to claim 3 is characterized in that described copper alloy also contains B:0.007～0.012wt%.
5. according to any described copper alloy tube of claim 1-4, it is characterized in that, described copper alloy also contain be selected from Sn, Fe, Co, Mg, Ni, Cr, Ti, and Zr among a kind of or two or more element arbitrarily, the total content of these elements is lower than 0.1wt%.
6. according to any described copper alloy tube of claim 1-4, it is characterized in that, described copper alloy also contain be selected from Sn, Fe, Co, Mg, Ni, Cr, Ti, and Zr among a kind of or two or more element arbitrarily, the total content of these elements is lower than 0.08wt%.
7. according to the described copper alloy tube of claim 1-4, it is characterized in that described copper alloy is by electrochemical corrosion measurement, the current density i of its current density ratio TP2
CrroLittle more than 10%.
8. copper alloy tube according to claim 5 is characterized in that, described copper alloy is by electrochemical corrosion measurement, the current density i of its current density ratio TP2
CrroLittle more than 10%.
9. copper alloy tube according to claim 6 is characterized in that, described copper alloy is by electrochemical corrosion measurement, the current density i of its current density ratio TP2
CrroLittle more than 10%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978433A (en) * | 2012-11-19 | 2013-03-20 | 宁波福士汽车部件有限公司 | Copper alloy pipe for air conditioner |
| CN104388750A (en) * | 2014-10-29 | 2015-03-04 | 陈唯锋 | Copper alloy for valve and preparation method thereof |
| CN110546286A (en) * | 2017-04-27 | 2019-12-06 | 丰川控股有限公司 | Copper pipe with excellent ant nest-like corrosion resistance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06192773A (en) * | 1992-10-27 | 1994-07-12 | Kobe Steel Ltd | Corrosion resistant copper alloy pipe |
| JPH07166276A (en) * | 1993-12-15 | 1995-06-27 | Mitsubishi Materials Corp | Copper alloy excellent in resistance to ant-lair-like corrosion and heat exchanger tube made of this copper alloy |
| JP2008255380A (en) * | 2007-03-30 | 2008-10-23 | Kobelco & Materials Copper Tube Inc | Corrosion-resistant copper alloy tube |
-
2011
- 2011-01-19 CN CN 201110022032 patent/CN102051500A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06192773A (en) * | 1992-10-27 | 1994-07-12 | Kobe Steel Ltd | Corrosion resistant copper alloy pipe |
| JPH07166276A (en) * | 1993-12-15 | 1995-06-27 | Mitsubishi Materials Corp | Copper alloy excellent in resistance to ant-lair-like corrosion and heat exchanger tube made of this copper alloy |
| JP2008255380A (en) * | 2007-03-30 | 2008-10-23 | Kobelco & Materials Copper Tube Inc | Corrosion-resistant copper alloy tube |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978433A (en) * | 2012-11-19 | 2013-03-20 | 宁波福士汽车部件有限公司 | Copper alloy pipe for air conditioner |
| CN104388750A (en) * | 2014-10-29 | 2015-03-04 | 陈唯锋 | Copper alloy for valve and preparation method thereof |
| CN110546286A (en) * | 2017-04-27 | 2019-12-06 | 丰川控股有限公司 | Copper pipe with excellent ant nest-like corrosion resistance |
| CN110546286B (en) * | 2017-04-27 | 2021-10-08 | Njt铜管株式会社 | Copper pipe with excellent ant nest-like corrosion resistance |
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