CN103938140A - Zinc-based alloy brazing process for heat exchanger of gas water heater - Google Patents
Zinc-based alloy brazing process for heat exchanger of gas water heater Download PDFInfo
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- CN103938140A CN103938140A CN201310021033.XA CN201310021033A CN103938140A CN 103938140 A CN103938140 A CN 103938140A CN 201310021033 A CN201310021033 A CN 201310021033A CN 103938140 A CN103938140 A CN 103938140A
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Abstract
The invention relates to the technical field of processing a heat exchanger of a gas water heater, and discloses a zinc-based alloy brazing process for the heat exchanger of the gas water heater. The main technical characteristics include that zinc-based alloy brazing is carried out on workpieces after oil removing, washing and activation are carried out on the workpieces; through excellent filling performance of alloy under a fusion state, the gaps between heat collecting sheets and copper pipes in the heat exchanger are effectively filled, and the effective heat exchange surface area of heat transfer is enlarged; at the same time, a layer of magnesium-zinc-titanium alloy is formed on the surface of each heat collecting sheet and each copper pipe, and the alloy has a high heat conductivity coefficient, so that the heat efficiency is further enhanced, and at the same time, the anti-corrosion performance is improved. The zinc-based alloy brazing process has remarkable effects on the improvement of the heat efficiency of the heat exchanger of the gas water heater, and the magnesium-zinc-titanium alloy also has excellent performances, such as excellent heat conductivity, higher hardness and abrasion resistance, corrosion resistance, high weather resistance and aging resistance.
Description
Technical field
The present invention relates to the processing technique field of heat-exchanger for gas-fired, relate in particular to a kind of heat-exchanger for gas-fired zinc base alloy soldering processes.
Background technology
Heat exchanger is the core component of gas heater, and its thermo-efficiency, material and complete processing etc. are significant concern points of industry always.Heat exchanger is through continuous renewal for many years, and at present main process of surface treatment has hot dip terne metal, oxygen free copper protection soldering.Along with the continuous lifting that market energy-conserving and environment-protective require, immersion plating lead process of tin traditional in industry far can not meet these requirements, and oxygen free copper heat exchanger manufacturing cost is higher.
21 century is the century of alloy, and in heat-exchanger surface process field, adopting the alternative traditional hot dip terne metal of zinc base alloy, oxygen free copper protection soldering is following development trend.At present, aspect hot-dip galvanizing technique, the large viscosity of the zinc-plating material that is heated, not runny restriction, it is mainly used in the more smooth workpiece of some surface ratios and processes.Meanwhile, on traditional hot-dip galvanizing technique, oil removing adopts different clean-out systems to realize with descaling conventionally, technique relative complex.In addition, oxidized for the zinc alloy that prevents from having plated, after hot dip, adopt chromic salts passivator to process toward contact.Chromic salts passivator mainly contains chromic salt and sexavalence chromic salts, but is that chromic salt and sexavalence chromic salts all inevitably cause environmental pollution.
In view of this, be very necessary to redesign a kind of zinc base alloy soldering processes that are applicable to gas heater heat exchange of exploitation.
Summary of the invention
For problems of the prior art, the object of the invention is to develop a kind of technique simple, the heat-exchanger for gas-fired of energy-conserving and environment-protective zinc base alloy soldering processes.
For reaching above object, the present invention adopts following technical scheme.
A kind of heat-exchanger for gas-fired zinc base alloy soldering processes, is characterized in that, its step comprises:
The first step, surface degreasing, first immerses heat exchanger in degreaser and removes workpiece surface greasy dirt and oxide skin, then adopts ultrasonic cleaning to purify;
Second step, surface cleaning, utilizes tap water repeatedly to clean heat-exchanger surface, to remove surperficial soda acid residue;
The 3rd step, surface active, immerses the heat exchanger cleaning up to take out afterwards in plating assistant agent 20 seconds-100 seconds;
The 4th step, pot galvanize processing, by after surface active heat exchanger immerse in the melting furnace of 430 DEG C-520 DEG C and carry out pot galvanize processing;
The 5th step, unnecessary alloy zinc is removed, and will take out through pot galvanize heat exchanger after treatment, is put in whizzer and carries out centrifugal treating, throws away the unnecessary alloy zinc in heat exchanger heat collecting sheet.
As with improvement, the degreaser in the described the first step is made up of tensio-active agent and weak acid; Described tensio-active agent is polyoxyethylene nonylphenol ether-10, one or more in fatty alcohol-polyoxyethylene ether-10, and described weak acid is HOOCCOOH.
As with improvement, the degreaser in the described the first step is made up of tensio-active agent and weak base; Described tensio-active agent is polyoxyethylene nonylphenol ether-10, one or more in fatty alcohol-polyoxyethylene ether-10, and described weak acid is Na2CO3, one or more in NaHCO3.
As with improvement, described the first step concrete steps are as follows: first utilize basicity be 11 point-15 the oil removing of basic solution normal temperature once, utilize basicity is that the water of 0 point-1.2 cleans once thereupon; Then utilizing basicity is the basic solution high temperature oil removing twice of 11 point-15, and ultrasonic wave oil removing once; Then utilizing basicity is that the water of 0 point-1.2 cleans that to use afterwards acidity for four times be the acidic solution descaling of 8 point-14 again.
As with improvement, the plating assistant agent in described the 3rd step is ZnCI2, NH4CI) mixture.
As with improvement, in the 4th step, in described melting furnace, be molten zinc alloy, in this zinc alloy, contain magnesium elements, zinc element and titanium elements.
As with improvement, after the 5th step, also have chromium-free deactivation step, described chromium-free deactivation adopts Sodium orthomolybdate passivator.
As with improvement, after the 3rd step surface active, before processing, the 4th step pot galvanize blows in addition water step; Blowing in water step, heat exchange is carried out to preheating simultaneously, the temperature range of preheating is: 80 DEG C～140 DEG C.
As with improvement, also comprise examination and test of products step, defective products is made to mark.
Compared with prior art, the present invention has following beneficial effect:
One, hot-dip galvanizing technique is applied in the surface treatment of gas heater, to be so used for pot galvanize processing be the revolutionary leap of domestic hot galvanizing surface treatment industry to complicated workpiece, started the historical beginning to precision sizing future development of pot galvanize.
Two, utilize the good filling properties of zinc alloy under molten state, the gap between heat collecting sheet in heat exchanger and copper pipe is effectively filled, strengthen the effective heat exchange surface area of heat exchange; In each heat collecting sheet and copper pipe surface, form one deck: magnesium-zinc-titanium alloy, this alloy has very high thermal conductivity, further strengthens its thermo-efficiency and improves its antiseptic property simultaneously simultaneously.In addition, magnesium-zinc-titanium alloy also has good thermal conductivity, higher hardness and wear resistance, erosion resistance, the high premium properties such as weather-proof, ageing-resistant.
Three, increase unnecessary alloy zinc and remove step, by the processing of whizzer, overcome pot galvanize viscosity of material and be not easy greatly mobile shortcoming, avoid unnecessary zinc alloy to be accumulated in the gap of heat exchanger, ensure the radiating effect of heat exchanger, and economize in raw materials, reduce costs.
Four, degreaser adopts tensio-active agent+organic acid to be composited, and has multi-efficiency, can not only remove the greasy dirt on copper surface, can also remove the oxide skin on copper surface simultaneously, makes oil removing, descaling two-in-one, simplifies technique, cost-saving.In addition, the organic acid of interpolation is oxalic acid, environment friendly and pollution-free, can directly discharge.
Five, add the processing of Sodium orthomolybdate passivation technology in the pot galvanize processing later stage, make copper surface luster keep delicious light always.Meanwhile, utilize Sodium orthomolybdate to replace traditional chromic salts passivation, the environmental pollution of having avoided chromic salts to bring.
Brief description of the drawings
Figure 1 shows that heat-exchanger for gas-fired zinc base alloy soldering processes schema provided by the invention;
Figure 2 shows that heat-exchanger for gas-fired zinc base alloy soldering processes step refinement figure provided by the invention.
Embodiment
For further setting forth essence of the present invention, by reference to the accompanying drawings the specific embodiment of the present invention is described as follows.
As shown in Figure 1 and Figure 2, a kind of heat-exchanger for gas-fired zinc base alloy soldering processes, its step comprises:
The first step step1, surface degreasing, first immerses heat exchanger in degreaser and removes workpiece surface greasy dirt and oxide skin, then adopts ultrasonic cleaning to purify.Here, for removing greasy dirt and the oxide skin of heat-exchanger surface, the chemical effective constituent of described degreaser comprises: Na2CO3, NaHCO3, polyoxyethylene nonylphenol ether-10, fatty alcohol-polyoxyethylene ether-10 and HOOCCOOH.Preferably, first utilize basicity be 11 point-15 the oil removing of basic solution normal temperature once, utilize basicity is that the water of 0 point-1.2 cleans once thereupon; Then utilizing basicity is the basic solution high temperature oil removing twice of 11 point-15, and ultrasonic wave oil removing once; Then utilizing basicity is that the water of 0 point-1.2 cleans that to use afterwards acidity for four times be the acidic solution descaling of 8 point-14 again.In other embodiments, described degreaser directly uses the mixed solution of tensio-active agent and HOOCCOOH, realizes oil removing, descaling step simultaneously, is not limited to the present embodiment.
Second step step2, surface cleaning, utilizes tap water repeatedly to clean heat-exchanger surface, to remove surperficial soda acid residue.Preferably, described surface cleaning step refers to that utilizing basicity is that the water of 0 point-1.2 cleans three times.
The 3rd step step3, surface active, immerses the heat exchanger cleaning up to take out afterwards in plating assistant agent 20 seconds-100 seconds.In the present embodiment, described plating assistant agent is preferably ZnCI2, NH4CI) mixture.
The 4th step step4, pot galvanize processing, by after surface active heat exchanger immerse in the melting furnace of 430 DEG C-520 DEG C and carry out pot galvanize processing.Preferably, in described melting furnace, be molten zinc alloy, in this zinc alloy, contain magnesium elements, zinc element and titanium elements.
The 5th step step5, unnecessary alloy zinc is removed, and will take out through pot galvanize heat exchanger after treatment, is put in whizzer and carries out centrifugal treating, throws away the unnecessary alloy zinc in heat exchanger heat collecting sheet.
The 6th step step6, chromium-free deactivation step, adopts chrome-free tanning agent Sodium orthomolybdate to carry out surface passivation to the heat exchanger after zinc-plated.
The 7th step step7, the examination and test of products.Defective products is made to mark.
Especially, in order to remove residual water-content, prevent quick-fried zinc; After the 3rd step surface active, before processing, the 4th step pot galvanize blows in addition water step step31.Blowing in water step step31, heat exchange is carried out to preheating simultaneously, with prevent heat exchanger when the immersion plating because temperature sharply raises and is out of shape, the temperature range of preheating is: 80 DEG C～140 DEG C.
Above embodiment has been described in detail essence of the present invention, but can not limit protection scope of the present invention with this.Apparently, under the enlightenment of essence of the present invention, the art those of ordinary skill also can carry out many improvement and modification, within it should be noted that these improvement and modification all drop on claim protection domain of the present invention.
Claims (9)
1. heat-exchanger for gas-fired zinc base alloy soldering processes, is characterized in that, its step comprises:
The first step, surface degreasing, first immerses heat exchanger in degreaser and removes workpiece surface greasy dirt and oxide skin, then adopts ultrasonic cleaning to purify;
Second step, surface cleaning, utilizes tap water repeatedly to clean heat-exchanger surface, to remove surperficial soda acid residue;
The 3rd step, surface active, immerses the heat exchanger cleaning up to take out afterwards in plating assistant agent 20 seconds-100 seconds;
The 4th step, pot galvanize processing, by after surface active heat exchanger immerse in the melting furnace of 430 DEG C-520 DEG C and carry out pot galvanize processing;
The 5th step, unnecessary alloy zinc is removed, and will take out through pot galvanize heat exchanger after treatment, is put in whizzer and carries out centrifugal treating, throws away the unnecessary alloy zinc in heat exchanger heat collecting sheet.
2. a kind of heat-exchanger for gas-fired zinc base alloy soldering processes according to claim 1, is characterized in that, the degreaser in the described the first step is made up of tensio-active agent and weak acid; Described tensio-active agent is polyoxyethylene nonylphenol ether-10, one or more in fatty alcohol-polyoxyethylene ether-10, and described weak acid is HOOCCOOH.
3. a kind of heat-exchanger for gas-fired zinc base alloy soldering processes according to claim 1, is characterized in that, the degreaser in the described the first step is made up of tensio-active agent and weak base; Described tensio-active agent is polyoxyethylene nonylphenol ether-10, one or more in fatty alcohol-polyoxyethylene ether-10, and described weak acid is Na
2cO
3, NaHCO
3in one or more.
4. a kind of heat-exchanger for gas-fired zinc base alloy soldering processes according to claim 1, it is characterized in that, described the first step concrete steps are as follows: first utilize basicity be 11 point-15 the oil removing of basic solution normal temperature once, utilize basicity is that the water of 0 point-1.2 cleans once thereupon; Then utilizing basicity is the basic solution high temperature oil removing twice of 11 point-15, and ultrasonic wave oil removing once; Then utilizing basicity is that the water of 0 point-1.2 cleans that to use afterwards acidity for four times be the acidic solution descaling of 8 point-14 again.
5. a kind of heat-exchanger for gas-fired zinc base alloy soldering processes according to claim 1, is characterized in that, the plating assistant agent in described the 3rd step is ZnCI
2, NH
4cI) mixture.
6. a kind of heat-exchanger for gas-fired zinc base alloy soldering processes according to claim 1, is characterized in that, in the 4th step, are molten zinc alloy in described melting furnace, contain magnesium elements, zinc element and titanium elements in this zinc alloy.
7. a kind of heat-exchanger for gas-fired zinc base alloy soldering processes according to claim 1, is characterized in that, also have chromium-free deactivation step after the 5th step, and described chromium-free deactivation adopts Sodium orthomolybdate passivator.
8. a kind of heat-exchanger for gas-fired zinc base alloy soldering processes according to claim 1, is characterized in that, after the 3rd step surface active, before the 4th step pot galvanize is processed, blow in addition water step; Blowing in water step, heat exchange is carried out to preheating simultaneously, the temperature range of preheating is: 80 DEG C～140 DEG C.
9. a kind of heat-exchanger for gas-fired zinc base alloy soldering processes according to claim 1, is characterized in that, also comprise examination and test of products step, and defective products is made to mark.
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| CN201310021033.XA CN103938140B (en) | 2013-01-21 | 2013-01-21 | Zinc-based alloy brazing process for heat exchanger of gas water heater |
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| CN201310021033.XA CN103938140B (en) | 2013-01-21 | 2013-01-21 | Zinc-based alloy brazing process for heat exchanger of gas water heater |
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| CN103938140A true CN103938140A (en) | 2014-07-23 |
| CN103938140B CN103938140B (en) | 2017-02-08 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082126A (en) * | 2007-07-10 | 2007-12-05 | 东莞市通旺达五金制品有限公司 | Local chemical-plating technique for aluminum radiator bores |
| CN101298680A (en) * | 2008-07-04 | 2008-11-05 | 孟庆刚 | Preservative treatment method for galvanizing in heat radiator |
| CN101899635A (en) * | 2010-08-04 | 2010-12-01 | 兴城市跃进镀锌有限公司 | Hot galvanizing method |
| CN102363875A (en) * | 2011-10-27 | 2012-02-29 | 北京京杰锐思技术开发有限公司 | Hot dip galvanizing method of steel structural members |
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2013
- 2013-01-21 CN CN201310021033.XA patent/CN103938140B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101082126A (en) * | 2007-07-10 | 2007-12-05 | 东莞市通旺达五金制品有限公司 | Local chemical-plating technique for aluminum radiator bores |
| CN101298680A (en) * | 2008-07-04 | 2008-11-05 | 孟庆刚 | Preservative treatment method for galvanizing in heat radiator |
| CN101899635A (en) * | 2010-08-04 | 2010-12-01 | 兴城市跃进镀锌有限公司 | Hot galvanizing method |
| CN102363875A (en) * | 2011-10-27 | 2012-02-29 | 北京京杰锐思技术开发有限公司 | Hot dip galvanizing method of steel structural members |
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