CN104593781A - Metal pot for air-conditioning outside unit and anticorrosion treatment process thereof - Google Patents
Metal pot for air-conditioning outside unit and anticorrosion treatment process thereof Download PDFInfo
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- CN104593781A CN104593781A CN201510059180.5A CN201510059180A CN104593781A CN 104593781 A CN104593781 A CN 104593781A CN 201510059180 A CN201510059180 A CN 201510059180A CN 104593781 A CN104593781 A CN 104593781A
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- tank body
- resin adhesive
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Abstract
The invention discloses an anticorrosion treatment process for an air-conditioning outside unit and a metal pot for the air-conditioning outside unit. The metal pot comprises a pot body, a metal tube and a supporting plate welded on the pot body, wherein the metal tube is welded on a flange of the pot body, and a crack is formed between the pot body and the supporting plate. The anticorrosion treatment process comprises the following steps: performing phosphating treatment on the outer surface of the metal pot and coating the outer surface with an anticorrosive paint; coating a first welding part of the metal tube and the flange of the pot body and a second welding part of the supporting plate and the pot body with a resin adhesive to form a first resin adhesive layer, and coating the part of the pot body opposite to the crack and the part of the supporting plate opposite to the crack with the resin adhesive to form a second resin adhesive layer. By adopting the anticorrosion treatment process of the metal pot of the air-conditioning outside unit, the corrosion resistance of the metal pot is greatly improved, the service life of the metal pot is increased, and the maintenance costs of the air conditioner manufacturers and the users are reduced.
Description
Technical field
The present invention relates to the metal tin for air-conditioner outdoor unit, also relate to the anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit.
Background technology
There is the defect of corrosion-resistant in the existing metal tin for air-conditioner outdoor unit.
Summary of the invention
The application makes the discovery of the following fact and problem and understanding based on contriver: the coating coverage for the second weld of the flange of the tank body of the metal tin of air-conditioner outdoor unit and the first weld of metal tube and tank body and back up pad is low, paint solidification process exists in liquid form, and coating cannot cover the second weld of the flange of tank body and the first weld of metal tube and tank body and back up pad effectively.And during electrostatic spraying, the crack between back up pad and tank body forms Faraday effect under strong electric field, and powder cannot enter into the inside of this crack, thus cause structure in this crack without coating protection, be directly exposed in air.
The second weld of the first weld of the flange of tank body and metal tube, back up pad and tank body and the crack between back up pad and tank body is caused to become the short slab of the erosion resistance of metal tin thus.Especially in the region of coastal area or heavy contamination, often there is the fault such as coating failure, tank body corrosion leakage in metal tin, causes air conditioner to lose efficacy.
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, the present invention proposes a kind of anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit.
The present invention also proposes a kind of metal tin for air-conditioner outdoor unit.
The back up pad that metal tin comprises tank body, metal tube and is welded on described tank body, described tank body has flange, and described metal tube is welded on described flange, forms crack between described tank body and described back up pad.The anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit of embodiment comprises the following steps according to a first aspect of the present invention: carry out bonderizing to the outside surface of described metal tin; The outside surface of described metal tin applies protective system to form surface anticorrosion coating; With the first weld of the flange at described metal tube and described tank body and the second weld coated with resins tackiness agent of described back up pad and described tank body to form the first resin adhesive layer, the part of the part relative with described crack of described tank body and the relative with described crack of described back up pad applies described resin adhesive to form the second resin adhesive layer.
By utilizing the anticorrosion treatment technology according to the metal tin for air-conditioner outdoor unit of the embodiment of the present invention, thus greatly can improve the corrosion resistance nature of metal tin, and then the work-ing life of metal tin can be improved, reduce the maintenance expense of air-conditioning manufacturer, user.
In addition, the anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit according to the above embodiment of the present invention can also have following additional technical characteristic:
According to one embodiment of present invention, described first resin adhesive layer covers the part of described flange, the part of described first weld of vicinity of described metal tube, the part of described second weld of vicinity of described tank body and described second weld of vicinity of described back up pad.
According to one embodiment of present invention, described second resin adhesive layer is full of described crack.
According to one embodiment of present invention, described resin adhesive comprises component A and B component, described component A comprises resin, mineral filler and reactive thinner, described resin comprises at least one in novolac epoxy, urethane resin, acrylic resin and nitro-compound, and described B component comprises polyamide-based solidifying agent and curing catalyst.
According to one embodiment of present invention, described resin adhesive comprises the described component A of 1-2 mass parts and the described B component of 1-2 mass parts.
According to one embodiment of present invention, described component A comprises the described reactive thinner of the described resin of 60wt%-70wt%, the described mineral filler of 20wt%-30wt% and 10wt%-20wt%, and described B component comprises the described polyamide-based solidifying agent of 80wt%-90wt% and the described curing catalyst of 10wt%-20wt%.
According to one embodiment of present invention, described mineral filler comprises at least one in aluminum oxide, silica-gel powder and asbestos powder, and described reactive thinner is epoxy propane butyl ether.
The metal tin for air-conditioner outdoor unit of embodiment comprises according to a second aspect of the present invention: tank body, and described tank body has flange; Metal tube, described metal tube is welded on described flange; Back up pad, described back up pad is welded on described tank body, forms crack between described tank body and described back up pad; Surface anticorrosion coating, described surface anticorrosion coating is located on the outside surface of each in described tank body, described metal tube and described back up pad; And first resin adhesive layer and the second resin adhesive layer, described first resin adhesive layer is located at the first weld of the flange of described metal tube and described tank body and the second weld of described back up pad and described tank body, and described second resin adhesive layer is located in the part of the part relative with described crack of described tank body and the relative with described crack of described back up pad.
According to one embodiment of present invention, described first resin adhesive layer covers the part of described flange, the part of described first weld of vicinity of described metal tube, the part of described second weld of vicinity of described tank body and described second weld of vicinity of described back up pad.
According to one embodiment of present invention, described second resin adhesive layer is full of described crack.
Accompanying drawing explanation
Fig. 1 is the schema of the anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit according to the embodiment of the present invention;
Fig. 2 is the structural representation of the metal tin for air-conditioner outdoor unit according to the embodiment of the present invention.
Reference numeral:
Metal tin 1,
Tank body 101, flange 1011, metal tube 102, back up pad 103, first resin adhesive layer 104, second resin adhesive layer 105
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The anticorrosion treatment technology of the metal tin 1 for air-conditioner outdoor unit according to the embodiment of the present invention is described with reference to the accompanying drawings.As shown in Figure 2, metal tin 1 comprises tank body 101, metal tube 102 and back up pad 103.Tank body 101 has flange 1011, and metal tube 102 is welded on flange 1011.Back up pad 103 is welded on tank body 101, forms crack between tank body 101 and back up pad 103.
As shown in Figure 1, comprise the following steps according to the anticorrosion treatment technology of the metal tin 1 for air-conditioner outdoor unit of the embodiment of the present invention:
Bonderizing is carried out to the outside surface of metal tin 1;
Outside surface to metal tin 1 applies protective system to form surface anticorrosion coating; With
At the second weld coated with resins tackiness agent of the first weld of metal tube 102 and the flange 1011 of tank body 101 and back up pad 103 and tank body 101 to form the first resin adhesive layer 104, the part of the part relative with this crack of tank body 101 and the relative with this crack of back up pad 103 applies this resin adhesive to form the second resin adhesive layer 105.
Anticorrosion treatment technology according to the metal tin 1 for air-conditioner outdoor unit of the embodiment of the present invention passes through coated with resins tackiness agent in the part relative with this crack of this first weld, this second weld and metal tin 1, thus not only greatly can improve the corrosion resistance nature of the second weld of the flange 1011 of tank body 101 and the first weld of metal tube 102 and tank body 101 and back up pad 103, and greatly can improve the corrosion resistance nature of the part relative with this crack of metal tin 1, thus the corrosion resistance nature of metal tin 1 can be improved further.
Therefore, by utilizing the anticorrosion treatment technology according to the metal tin 1 for air-conditioner outdoor unit of the embodiment of the present invention, thus greatly can improve the corrosion resistance nature of metal tin 1, and then the work-ing life of metal tin 1 can be improved, reduce the maintenance expense of air-conditioning manufacturer, user.
Can be gas-liquid separator, strainer, compressor etc. according to the metal tin 1 for air-conditioner outdoor unit of the embodiment of the present invention.Particularly, tank body 101 can be steel tank, and metal tube 102 can be copper pipe.
Carrying out bonderizing to the outside surface of metal tin 1 can the outside surface of clean metal tank 1.Described bonderizing can comprise oil removing, washing, phosphatization and drying.In other words, successively oil removing, washing, phosphatization and drying are carried out to the outside surface of metal tin 1.Described bonderizing can be identical with known bonderizing, and have nothing to do with the inventive point of the application, therefore no longer describes in detail.
In this application, the method that the outside surface of metal tin 1 applies protective system can be identical with the method for known coating protective system, and have nothing to do with the inventive point of the application, therefore no longer describes in detail.Such as, apply epoxy-polyester coating or pure polyester coating by electrostatic spraying on the outside surface of metal tin 1, namely this protective system is epoxy-polyester coating or pure polyester coating.
In an example of the present invention, as shown in Figure 2, first resin adhesive layer 104 covers the part of this first weld of vicinity of flange 1011 and metal tube 102, and the first resin adhesive layer 104 also covers the part of the part of this second weld of vicinity of tank body 101 and vicinity second weld of back up pad 103.That is, the first resin adhesive layer 104 cover on whole flange 1011, the neighboring area of this first weld and the neighboring area of this second weld.
The corrosion resistance nature of the second weld of the flange 1011 of tank body 101 and the first weld of metal tube 102 and tank body 101 and back up pad 103 can be improved thus further, thus the corrosion resistance nature of metal tin 1 can be improved further.
As shown in Figure 2, advantageously, the second resin adhesive layer 105 is full of crack, is full of the second resin adhesive layer 105 in the crack namely between tank body 101 and back up pad 103.The corrosion resistance nature of the part relative with this crack of metal tin 1 can be improved thus further, thus the corrosion resistance nature of metal tin 1 can be improved further.
This resin adhesive comprises component A and B component, and this component A comprises resin, mineral filler and reactive thinner.Wherein, this resin comprises at least one in novolac epoxy, urethane resin, acrylic resin and nitro-compound, and this mineral filler comprises at least one in aluminum oxide, silica-gel powder and asbestos powder, and this reactive thinner is epoxy propane butyl ether.This B component comprises polyamide-based solidifying agent and curing catalyst.
Specifically, this resin adhesive comprises the component A of 1-2 mass parts and the B component of 1-2 mass parts.Advantageously, this resin adhesive comprises the component A of 1 mass parts and the B component of 1 mass parts.In other words, this component A and this B component mix according to the mass ratio of 1:1.
In a concrete example of the present invention, this component A comprises the reactive thinner of the resin of 60wt%-70wt%, the mineral filler of 20wt%-30wt% and 10wt%-20wt%.Preferably, this component A comprises the reactive thinner of the resin of 65wt%, the mineral filler of 25wt% and 10wt%.
This B component comprises the polyamide-based solidifying agent of 80wt%-90wt% and the curing catalyst of 10wt%-20wt%.Preferably, this B component comprises the polyamide-based solidifying agent of 85wt% and the curing catalyst of 15wt%.
Present invention also offers a kind of metal tin 1 for air-conditioner outdoor unit.As shown in Figure 2, tank body 101, metal tube 102, back up pad 103, surface anticorrosion coating (not shown), the first resin adhesive layer 104 and the second resin adhesive layer 105 is comprised according to the metal tin 1 for air-conditioner outdoor unit of the embodiment of the present invention.
Tank body 101 has flange 1011, and metal tube 102 is welded on flange 1011.Back up pad 103 is welded on tank body 101, forms crack between tank body 101 and back up pad 103.This surface anticorrosion coating is located on the outside surface of each in tank body 101, metal tube 102 and back up pad 103.First resin adhesive layer 104 is located at first weld of metal tube 102 with the flange 1011 of tank body 101 and the second weld of back up pad 103 and tank body 101, and the second resin adhesive layer 105 is located in the part of the part relative with this crack of tank body 101 and the relative with this crack of back up pad 103.
Not only greatly can improve the corrosion resistance nature of the second weld of the flange 1011 of tank body 101 and the first weld of metal tube 102 and tank body 101 and back up pad 103 thus, and greatly can improve the corrosion resistance nature of the part relative with this crack of metal tin 1, thus the corrosion resistance nature of metal tin 1 can be improved further.
Embodiment 1
Bonderizing is carried out to the outside surface of metal tin 1, then on the outside surface of metal tin 1, applies pure polyester coating to form surface anticorrosion coating.Component A and B component are mixed, to obtain resin adhesive according to the mass ratio of 1:2.Wherein, component A comprises the epoxy propane butyl ether of the novolac epoxy of 60wt%, the aluminum oxide of 20wt% and 20wt%, and B component comprises the curing catalyst of the polyamide-based solidifying agent of 80wt% and 20wt%.
Finally, at the second weld coated with resins tackiness agent of the first weld of metal tube 102 and the flange 1011 of tank body 101 and back up pad 103 and tank body 101 to form the first resin adhesive layer 104, at the part coated with resins tackiness agent of the part relative with this crack of tank body 101 and the relative with this crack of back up pad 103 to form the second resin adhesive layer 105.
Embodiment 2
Bonderizing is carried out to the outside surface of metal tin 1, then on the outside surface of metal tin 1, applies epoxy-polyester coating to form surface anticorrosion coating.Component A and B component are mixed, to obtain resin adhesive according to the mass ratio of 2:1.Wherein, component A comprises the epoxy propane butyl ether of the urethane resin of 65wt%, the silica-gel powder of 25wt% and 10wt%, and B component comprises the curing catalyst of the polyamide-based solidifying agent of 90wt% and 10wt%.
Finally, at the second weld coated with resins tackiness agent of the first weld of metal tube 102 and the flange 1011 of tank body 101 and back up pad 103 and tank body 101 to form the first resin adhesive layer 104, at the part coated with resins tackiness agent of the part relative with this crack of tank body 101 and the relative with this crack of back up pad 103 to form the second resin adhesive layer 105.
Embodiment 3
Bonderizing is carried out to the outside surface of metal tin 1, then on the outside surface of metal tin 1, applies epoxy-polyester coating to form surface anticorrosion coating.Component A and B component are mixed, to obtain resin adhesive according to the mass ratio of 1:1.Wherein, component A comprises the epoxy propane butyl ether of the acrylic resin of 70wt%, the asbestos powder of 20wt% and 10wt%, and B component comprises the curing catalyst of the polyamide-based solidifying agent of 85wt% and 15wt%.
Finally, at the second weld coated with resins tackiness agent of the first weld of metal tube 102 and the flange 1011 of tank body 101 and back up pad 103 and tank body 101 to form the first resin adhesive layer 104, at the part coated with resins tackiness agent of the part relative with this crack of tank body 101 and the relative with this crack of back up pad 103 to form the second resin adhesive layer 105.
Embodiment 4
Bonderizing is carried out to the outside surface of metal tin 1, then on the outside surface of metal tin 1, applies epoxy-polyester coating to form surface anticorrosion coating.Component A and B component are mixed, to obtain resin adhesive according to the mass ratio of 1:1.Wherein, component A comprises acrylic resin and nitro-compound, the silica-gel powder of 30wt% and the epoxy propane butyl ether of asbestos powder and 10wt% of 60wt%, and B component comprises the curing catalyst of the polyamide-based solidifying agent of 85wt% and 15wt%.
Finally, at the second weld coated with resins tackiness agent of the first weld of metal tube 102 and the flange 1011 of tank body 101 and back up pad 103 and tank body 101 to form the first resin adhesive layer 104, at the part coated with resins tackiness agent of the part relative with this crack of tank body 101 and the relative with this crack of back up pad 103 to form the second resin adhesive layer 105.
According to GB/T 1771, the metal tin 1 for air-conditioner outdoor unit that the existing metal tin for air-conditioner outdoor unit and embodiment 1-4 obtain is carried out to the mensuration of paint and varnish and resistance to neutral salt spray performance.There is corrosion at 240 hours in the existing metal tin for air-conditioner outdoor unit, the metal tin 1 for air-conditioner outdoor unit that embodiment 1-10 obtains does not occur corrosion in test after 800 hours.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection or each other can communication; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification sheets or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1., for an anticorrosion treatment technology for the metal tin of air-conditioner outdoor unit, it is characterized in that,
The back up pad that described metal tin comprises tank body, metal tube and is welded on described tank body, described tank body has flange, and described metal tube is welded on described flange, forms crack between described tank body and described back up pad,
Described anticorrosion treatment technology comprises the following steps:
Bonderizing is carried out to the outside surface of described metal tin;
The outside surface of described metal tin applies protective system to form surface anticorrosion coating; With
At the first weld of the flange of described metal tube and described tank body and the second weld coated with resins tackiness agent of described back up pad and described tank body to form the first resin adhesive layer, the part of the part relative with described crack of described tank body and the relative with described crack of described back up pad applies described resin adhesive to form the second resin adhesive layer.
2. the anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit according to claim 1, it is characterized in that, described first resin adhesive layer covers the part of described flange, the part of described first weld of vicinity of described metal tube, the part of described second weld of vicinity of described tank body and described second weld of vicinity of described back up pad.
3. the anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit according to claim 1 and 2, is characterized in that, described second resin adhesive layer is full of described crack.
4. the anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit according to claim 1, it is characterized in that, described resin adhesive comprises component A and B component, described component A comprises resin, mineral filler and reactive thinner, described resin comprises at least one in novolac epoxy, urethane resin, acrylic resin and nitro-compound, and described B component comprises polyamide-based solidifying agent and curing catalyst.
5. the anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit according to claim 4, is characterized in that, described resin adhesive comprises the described component A of 1-2 mass parts and the described B component of 1-2 mass parts.
6. the anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit according to claim 4, it is characterized in that, described component A comprises the described reactive thinner of the described resin of 60wt%-70wt%, the described mineral filler of 20wt%-30wt% and 10wt%-20wt%, and described B component comprises the described polyamide-based solidifying agent of 80wt%-90wt% and the described curing catalyst of 10wt%-20wt%.
7. the anticorrosion treatment technology of the metal tin for air-conditioner outdoor unit according to claim 4, is characterized in that, described mineral filler comprises at least one in aluminum oxide, silica-gel powder and asbestos powder, and described reactive thinner is epoxy propane butyl ether.
8. for a metal tin for air-conditioner outdoor unit, it is characterized in that, comprising:
Tank body, described tank body has flange;
Metal tube, described metal tube is welded on described flange;
Back up pad, described back up pad is welded on described tank body, forms crack between described tank body and described back up pad;
Surface anticorrosion coating, described surface anticorrosion coating is located on the outside surface of each in described tank body, described metal tube and described back up pad; And
First resin adhesive layer and the second resin adhesive layer, described first resin adhesive layer is located at the first weld of the flange of described metal tube and described tank body and the second weld of described back up pad and described tank body, and described second resin adhesive layer is located in the part of the part relative with described crack of described tank body and the relative with described crack of described back up pad.
9. the metal tin for air-conditioner outdoor unit according to claim 8, it is characterized in that, described first resin adhesive layer covers the part of described flange, the part of described first weld of vicinity of described metal tube, the part of described second weld of vicinity of described tank body and described second weld of vicinity of described back up pad.
10. the metal tin for air-conditioner outdoor unit according to claim 8 or claim 9, it is characterized in that, described second resin adhesive layer is full of described crack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510059180.5A CN104593781B (en) | 2015-02-04 | 2015-02-04 | Metal can and its anticorrosion treatment technology for air-conditioner outdoor unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510059180.5A CN104593781B (en) | 2015-02-04 | 2015-02-04 | Metal can and its anticorrosion treatment technology for air-conditioner outdoor unit |
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| CN104593781A true CN104593781A (en) | 2015-05-06 |
| CN104593781B CN104593781B (en) | 2017-09-26 |
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| CN1410721A (en) * | 2001-09-24 | 2003-04-16 | 广东科龙电器股份有限公司 | Manufacturing method of super hydrophili finned sheet and air conditioning heat exchanger |
| JP2010096437A (en) * | 2008-10-17 | 2010-04-30 | Mitsubishi Electric Corp | Air conditioner and coating composition |
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| US20140083657A1 (en) * | 2011-05-31 | 2014-03-27 | Daikin Industries, Ltd. | Fin of heat exchanger, heat exchanger, and air conditioning apparatus |
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| CN1410721A (en) * | 2001-09-24 | 2003-04-16 | 广东科龙电器股份有限公司 | Manufacturing method of super hydrophili finned sheet and air conditioning heat exchanger |
| JP2010096437A (en) * | 2008-10-17 | 2010-04-30 | Mitsubishi Electric Corp | Air conditioner and coating composition |
| US20140083657A1 (en) * | 2011-05-31 | 2014-03-27 | Daikin Industries, Ltd. | Fin of heat exchanger, heat exchanger, and air conditioning apparatus |
| CN102430509A (en) * | 2011-11-17 | 2012-05-02 | 中国电器科学研究院有限公司 | Coating process applying water-based paint to key components of central air conditioner |
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