CN104294261A - Surface chemical conversion film treatment process for evaporator aluminium tubes - Google Patents
Surface chemical conversion film treatment process for evaporator aluminium tubes Download PDFInfo
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- CN104294261A CN104294261A CN201310305832.XA CN201310305832A CN104294261A CN 104294261 A CN104294261 A CN 104294261A CN 201310305832 A CN201310305832 A CN 201310305832A CN 104294261 A CN104294261 A CN 104294261A
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- acid
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- aluminum pipe
- solution
- passivation
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/46—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing oxalates
- C23C22/47—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing oxalates containing also phosphates
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- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention discloses a surface chemical conversion film treatment process for evaporator aluminium tubes. The process adopts a treatment solution composed of: 26-30g/L of 85% phosphoric acid, 10-12g/L of potassium titanium oxalate, 6-8g/L of fluozirconic acid, 6-8g/L s of sodium fluoride, 10-12g/L of zinc sulfide, 14-16g/L of sodium dihydrogen phosphate, 15-19g/L of silica gel, 6-8g/L of ethylenediamine tetraacetic acid, 3-5g/L of citric acid, 12-14g/L of 68% nitric acid, 5-7g/L of peregal, and the balance water. The treatment process includes: preparing the treatment solution with the above composition, during use, adding the solution into water for dilution in a ratio of 1:18-22, cooling aluminum tubes formed by continuous extrusion, carrying out passivation in a passivation solution at 35-55DEG C for 4-8 seconds, and then conducting air drying curing.
Description
Technical field
The present invention relates to technical field of surface, particularly relate to a kind of aluminum pipe for evaporator surface chemical conversion film treatment process.
Background technology
Vaporizer is the heat exchanging apparatus that domestic refrigerator is conventional, plays most important effect at refrigerator or refrigerator-freezer operational process.Due to reasons such as prices, traditional Copper-tube Evaporator is replaced by aluminum pipe vaporizer mostly.Compare with copper pipe, aluminum pipe has lightweight, low cost and other advantages.But the surperficial natural oxidizing layer of aluminium is very thin, corrosion-resistant.In refrigerator ice cabinet processing and use procedure, due to reasons such as environment, aluminum pipe can suffer corrosion failure, causes refrigrant leakage.Because refrigerator ice cabinet vaporizer aluminum pipe is generally be cast on foaming box body inside, once aluminum pipe perforation is leaked, repair difficulty, often cause scrapping of whole refrigerator or refrigerator-freezer, cause the wasting of resources, and to environment.
Aluminium is as the maximum non-ferrous metal of usage quantity, and improve its corrosion resistance nature is people's study hotspot always.The chemical passivation of traditional chromic acid salt is because adopting containing medicaments such as chromium, and this pollutes environment and storage food, and current many countries prohibite.Patent CN1417381A (aluminium part surface treating method) and CN1920110A (a kind of anodic oxidation technology for inner and outer wall of aluminium tube) proposes to adopt anode oxidation process, through this method process, aluminium surface forms a fine and close oxidation film layer, and aluminum pipe corrosion resistance nature increases substantially.But this technique will through steps such as pre-treatment, anodic oxidation, sealings, and process is complicated, and the time is longer.In addition, thicker oxidation film layer is firmly crisp, and be unfavorable for the bending machining of follow-up refrigerator ice cabinet production process, between copper aluminium, joint easily produces leakage.Patent CN1683590, CN1811014 proposition titanium salt and fluorochemical are the Chromeless process flow process of main body, but the treatment time is still longer, and effect is undesirable.
Refrigerator ice cabinet aluminum pipe for evaporator produces the continuously extruded shaping of general employing health wind, and extrusion speed reaches 60-150m/mim, if will realize online chemical passivation process, the chemical passivation time must match with extrusion molding speed, namely completes within the several seconds.In the follow-up course of processing of refrigerator ice cabinet vaporizer aluminum pipe, need bend coiling, aluminum pipe also needs and copper pipe joint weld, and chemical passivation aluminum pipe must meet its processing characteristics.Therefore, find a kind of simple, quick, economical, the chemical passivation method being applicable to refrigerator ice cabinet vaporizer demand is significant.
Summary of the invention
The object of the invention is to propose a kind of aluminum pipe for evaporator surface chemical conversion film treatment process, the treatment solution that this technique adopts is not containing chromium, online conversion processing is carried out to the aluminum tube surfaces in the continuously extruded process of health wind, improves the corrosion resistance that aluminum pipe used by refrigerator ice cabinet vaporizer etc.
For reaching this object, the present invention by the following technical solutions:
A kind of aluminum pipe for evaporator surface chemical conversion film treatment process, consisting of of the treatment solution that this technique adopts: 85% phosphoric acid 26-30g/L, titanium potassium oxalate(T.P.O.) 10-12g/L, fluorine zirconic acid 6-8g/L, Sodium Fluoride 6-8g/L, zinc sulphide 10-12g/L, SODIUM PHOSPHATE, MONOBASIC 14-16g/L, silica gel 15-19g/L, disodium ethylene diamine tetraacetate 6-8g/L, citric acid 3-5g/L, 68% nitric acid 12-14g/L, peregal 5-7g/L, surplus is water, described treatment process is: preparation has the treatment solution of above-mentioned composition, during use, it is added to the water dilution according to the ratio of 1:18-22, the aluminum pipe of continuously extruded shaping is cooled, passivation is carried out at the passivating solution of 35-55 DEG C, passivation time is 4-8 second, then through air-dry solidification.
Beneficial effect of the present invention is:
The present invention, by adjustment to the component for the treatment of solution, makes it not containing chromium, safety and environmental protection, and can in health wind continuous extrusion production online treatment.Aluminum pipe for evaporator corrosion resisting property through conversion coating treating fluid process of the present invention significantly improves, and resistance to neutral salt spray test can reach more than 400 hours.
Embodiment
Embodiment one
A kind of aluminum pipe for evaporator surface chemical conversion film treatment process, consisting of of the treatment solution that this technique adopts: 85% phosphoric acid 26g/L, titanium potassium oxalate(T.P.O.) 12g/L, fluorine zirconic acid 6g/L, Sodium Fluoride 8g/L, zinc sulphide 10g/L, SODIUM PHOSPHATE, MONOBASIC 16g/L, silica gel 15g/L, disodium ethylene diamine tetraacetate 8g/L, citric acid 3g/L, 68% nitric acid 14g/L, peregal 5g/L, surplus is water, described treatment process is: preparation has the treatment solution of above-mentioned composition, during use, it is added to the water dilution according to the ratio of 1:18, the aluminum pipe of continuously extruded shaping is cooled, passivation is carried out at the passivating solutions of 55 DEG C, passivation time is 4 seconds, then through air-dry solidification.
Embodiment two
A kind of aluminum pipe for evaporator surface chemical conversion film treatment process, consisting of of the treatment solution that this technique adopts: 85% phosphoric acid 30g/L, titanium potassium oxalate(T.P.O.) 10g/L, fluorine zirconic acid 8g/L, Sodium Fluoride 6g/L, zinc sulphide 12g/L, SODIUM PHOSPHATE, MONOBASIC 14g/L, silica gel 19g/L, disodium ethylene diamine tetraacetate 6g/L, citric acid 5g/L, 68% nitric acid 12g/L, peregal 7g/L, surplus is water, described treatment process is: preparation has the treatment solution of above-mentioned composition, during use, it is added to the water dilution according to the ratio of 1:22, the aluminum pipe of continuously extruded shaping is cooled, passivation is carried out at the passivating solutions of 35 DEG C, passivation time is 8 seconds, then through air-dry solidification.
Embodiment three
A kind of aluminum pipe for evaporator surface chemical conversion film treatment process, consisting of of the treatment solution that this technique adopts: 85% phosphoric acid 28g/L, titanium potassium oxalate(T.P.O.) 11g/L, fluorine zirconic acid 7g/L, Sodium Fluoride 7g/L, zinc sulphide 11g/L, SODIUM PHOSPHATE, MONOBASIC 15g/L, silica gel 17g/L, disodium ethylene diamine tetraacetate 7g/L, citric acid 4g/L, 68% nitric acid 13g/L, peregal 6g/L, surplus is water, described treatment process is: preparation has the treatment solution of above-mentioned composition, during use, it is added to the water dilution according to the ratio of 1:20, the aluminum pipe of continuously extruded shaping is cooled, passivation is carried out at the passivating solutions of 45 DEG C, passivation time is 6 seconds, then through air-dry solidification.
Claims (1)
1. an aluminum pipe for evaporator surface chemical conversion film treatment process, it is characterized in that, consisting of of the treatment solution that this technique adopts: 85% phosphoric acid 26-30g/L, titanium potassium oxalate(T.P.O.) 10-12g/L, fluorine zirconic acid 6-8g/L, Sodium Fluoride 6-8g/L, zinc sulphide 10-12g/L, SODIUM PHOSPHATE, MONOBASIC 14-16g/L, silica gel 15-19g/L, disodium ethylene diamine tetraacetate 6-8g/L, citric acid 3-5g/L, 68% nitric acid 12-14g/L, peregal 5-7g/L, surplus is water, described treatment process is: preparation has the treatment solution of above-mentioned composition, during use, it is added to the water dilution according to the ratio of 1:18-22, the aluminum pipe of continuously extruded shaping is cooled, passivation is carried out at the passivating solution of 35-55 DEG C, passivation time is 4-8 second, then through air-dry solidification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310305832.XA CN104294261A (en) | 2013-07-19 | 2013-07-19 | Surface chemical conversion film treatment process for evaporator aluminium tubes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310305832.XA CN104294261A (en) | 2013-07-19 | 2013-07-19 | Surface chemical conversion film treatment process for evaporator aluminium tubes |
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| Publication Number | Publication Date |
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| CN104294261A true CN104294261A (en) | 2015-01-21 |
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| CN201310305832.XA Pending CN104294261A (en) | 2013-07-19 | 2013-07-19 | Surface chemical conversion film treatment process for evaporator aluminium tubes |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109112554A (en) * | 2018-10-31 | 2019-01-01 | 三达奥克化学股份有限公司 | Aluminum alloy pattern plate cement slurry efficient cleaner for building and preparation method thereof |
| WO2019084989A1 (en) * | 2017-11-06 | 2019-05-09 | 常熟市欧迪管业有限公司 | Titanium tube for evaporator |
-
2013
- 2013-07-19 CN CN201310305832.XA patent/CN104294261A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019084989A1 (en) * | 2017-11-06 | 2019-05-09 | 常熟市欧迪管业有限公司 | Titanium tube for evaporator |
| CN109112554A (en) * | 2018-10-31 | 2019-01-01 | 三达奥克化学股份有限公司 | Aluminum alloy pattern plate cement slurry efficient cleaner for building and preparation method thereof |
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Application publication date: 20150121 |