JPH01217197A - Heat exchanger made of aluminum - Google Patents
Heat exchanger made of aluminumInfo
- Publication number
- JPH01217197A JPH01217197A JP4005988A JP4005988A JPH01217197A JP H01217197 A JPH01217197 A JP H01217197A JP 4005988 A JP4005988 A JP 4005988A JP 4005988 A JP4005988 A JP 4005988A JP H01217197 A JPH01217197 A JP H01217197A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- heat exchanger
- film
- aluminum
- alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910000640 Fe alloy Inorganic materials 0.000 claims abstract description 19
- 238000005219 brazing Methods 0.000 claims abstract description 9
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims abstract description 4
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000005260 corrosion Methods 0.000 claims description 20
- 230000007797 corrosion Effects 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000005304 joining Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 11
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 12
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005536 corrosion prevention Methods 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 235000011511 Diospyros Nutrition 0.000 description 1
- 244000236655 Diospyros kaki Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000008141 laxative Substances 0.000 description 1
- 230000002475 laxative effect Effects 0.000 description 1
- 229910000372 mercury(II) sulfate Inorganic materials 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/126—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element consisting of zig-zag shaped fins
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
- F28D1/0478—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag the conduits having a non-circular cross-section
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2275/00—Fastening; Joining
- F28F2275/04—Fastening; Joining by brazing
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野Ｊ
本発明は自動車用空調装置のコンデンサ・エバポレータ
停の熱交換器に関し、特にその防食効果の向上に関する
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J] The present invention relates to a heat exchanger for a condenser/evaporator stop of an automobile air conditioner, and particularly to improvement of its anticorrosion effect.
［従来技術］
近年、自動車は重量軽減による燃費性向１；が重要な技
傭課題として取り」：ぼられ、空調装置用コンデンサ、
エバポレーク等の熱交換器においても、軽量化や経済性
にすぐれているアルミニウム又はアルミニウム合金の使
用が一般的になってきている。この柿の熱交換器は第１
図、第５図に示すように、一般的にアルミニウム合金か
らなるチューブ２の４２行部間の間隙に、極く薄いアル
ミニウム合金材のコルゲート形のフィン３を挿入し、こ
の組み合わせＩＭｎを保持させた上で全体を加熱炉内に
納めて、チューブ又はフィンに被覆されているろう材の
清遊温度まで加熱することによって、各部材をろう接し
て熱交換器を完成させている。これらアルミニラ義倉金
による熱交換器は、自然環境中に広汎に存在する塩分な
どによって腐食し易く、電気化学的な腐食に対し弱い性
質を有している。[Prior art] In recent years, the improvement of fuel efficiency due to weight reduction of automobiles has become an important technological issue.
Even in heat exchangers such as evaporative lakes, the use of aluminum or aluminum alloys, which are lightweight and economical, has become common. This persimmon heat exchanger is the first
As shown in FIG. 5, corrugated fins 3 made of extremely thin aluminum alloy are inserted into the gaps between the 42 rows of the tube 2, which is generally made of aluminum alloy, to hold this combination IMn. After that, the entire heat exchanger is placed in a heating furnace and heated to the clearing temperature of the brazing material covering the tubes or fins, and each member is soldered to complete the heat exchanger. These heat exchangers made of alumina Yoshikura metal are easily corroded by salts that are widely present in the natural environment, and are susceptible to electrochemical corrosion.
したがってコンデンサのように高温で使用され、しかも
ｌ１ｔＩ記の環境に曝され易い雰囲気中に使用される熱
交換器では特に腐食が発生し、退行し易く、それによっ
て冷媒洩れとなる問題があった。アルミニウム製熱交換
器の防食法としては、例えば特公昭５７−１８１１９号
公報にもあるように、従来は冷媒通路となるチューブの
材料に対し、フィンを卑なる電位を有するＺｎやＭｇを
含むアルミニウム合金材にて構成し、フィン材の犠牲効
果によってチューブの腐食を防止するようにしているが
、真空ろう対決によって高温耳中でろう付する場合には
、フィン又はチューブ１こ添加したＺｎ或いはろう材に
含有したＺｎが加熱中に蒸発するので残留Ｚｎ１１度が
低くなり電食に対する防食効果が低減する傾向がある。Therefore, heat exchangers, such as capacitors, which are used at high temperatures and are used in atmospheres that are easily exposed to the environments described in Section 11, are particularly prone to corrosion and deterioration, which poses the problem of refrigerant leakage. As a corrosion prevention method for aluminum heat exchangers, for example, as described in Japanese Patent Publication No. 57-18119, conventionally, the fins were made of aluminum containing Zn or Mg, which has a base potential. It is made of an alloy material and the corrosion of the tube is prevented by the sacrificial effect of the fin material, but when brazing in a high temperature ear by vacuum brazing, Zn or wax added to one fin or tube is used. Since the Zn contained in the material evaporates during heating, the residual Zn11 degree decreases and the corrosion prevention effect against electrolytic corrosion tends to decrease.
そこで熱交換器の表面にクロム酸系の化成処理７による
皮膜と史にその１−層に例えば実開昭５４−１１９０４
４号公報にもあるように塗装置等を行い、外表部に保護
皮膜を形ＩＲＬ、これによって防食する方法が一般的で
ある。Therefore, the surface of the heat exchanger is coated with a chromic acid-based chemical conversion treatment 7.
As described in Publication No. 4, a common method is to apply a coating or the like to form a protective film on the outer surface of the material (IRL), thereby preventing corrosion.
［発１１Ｊ１が解決しようとする課題］しかしながら、
腐食環境の厳しい条件下で使用される場合には、前記防
食処理のみでは十分でなく、腐食による熱交換器の冷媒
洩れが発生する場合がある。これは、熱交換器表面のＺ
ｎ層による電食防止効果が不十分であると共に塗装によ
る塗膜が、熱交換器の如き複雑な形状の物品に対して塗
料の着きまわりが悪く、このため膜圧が均一性に欠ける
という事き、物理的なＪＣＩ因により塗膜が剥離するこ
とがあり、このような＠所はその他の個ｆＩＩＦと比べ
て通電性も高く、腐食傾向の大きい個所となってアルミ
ニラｌ、材の腐食に特徴的な孔食腐食の形態を生じ易く
なるという欠点に起因して、熱交換器のチューブに冷媒
洩れを発生し使用不能となる問題を有しているからであ
る。[Issues that 11J1 attempts to solve] However,
When the heat exchanger is used in a severe corrosive environment, the anticorrosion treatment alone is not sufficient, and refrigerant leakage from the heat exchanger may occur due to corrosion. This is the Z of the heat exchanger surface.
The electrolytic corrosion prevention effect of the n-layer is insufficient, and the coating film has poor coverage on products with complex shapes such as heat exchangers, resulting in a lack of uniformity in film thickness. However, the coating film may peel off due to physical JCI causes, and such places have higher electrical conductivity than other parts, and are places with a strong tendency to corrode, causing corrosion of aluminum and materials. This is because the heat exchanger has the problem of being susceptible to a characteristic form of pitting corrosion, which causes refrigerant leakage to the tubes of the heat exchanger, rendering it unusable.
そこで本発明は上記の問題点に鑑みてなされたもので、
厳しい腐食環境下でもアルミニウム製熱交換器の防食効
果を向上させる事を目的とする。Therefore, the present invention was made in view of the above problems.
The purpose is to improve the corrosion protection effect of aluminum heat exchangers even in severe corrosive environments.
［、！！ｌ！題を解決するための手段］本発明の要旨は
、アルミニウｌ、材チューブと該チューブ間に介装した
アルミニウム材フィンとを、炉中ろう対決により互いに
接合してなるコア部を備えたアルミニウム製熱交換器に
おいて、コア部表面にＺｎ−Ｆｅ合金からなる皮膜を下
Ｊｍとし、上層にクロム酸系の化成皮膜を形成して、防
食性を向上させるようにしたことである。[,! ! l! [Means for Solving the Problems] The gist of the present invention is to provide an aluminum tube having a core portion formed by joining an aluminum tube and an aluminum fin interposed between the tubes to each other by brazing in a furnace. In the heat exchanger, a Zn-Fe alloy film is formed as a lower layer on the surface of the core part, and a chromic acid-based chemical conversion film is formed on the upper layer to improve corrosion resistance.
〔作用Ｊ
上記のようにして形成された熱交換器表面のＺｎ−Ｆｅ
合金からなる皮膜は、チューブ材に比して電極組ｆ々が
十分卑で厚さも確保されているので犠り％ｌ１）ｊ食効
果を向上させる七共に、又前記皮膜がチューブに対して
全面的に施されているので化成皮膜の防食能力と相乗的
に防食性能が向」ニジ、第４図に示されるように従来品
Ｂに対し本発明晶Ａは著しい効果がある。従って腐食環
境の厳しい条件下においても長期間的確な防食効果を果
し得るものであり上記目的を達ＪＲすることができる。[Action J: Zn-Fe on the surface of the heat exchanger formed as described above
Compared to the tube material, the coating made of alloy is sufficiently base for the electrode assembly and has a sufficient thickness, so the coating improves the corrosion effect, and the coating covers the entire surface of the tube. As shown in FIG. 4, the crystal A of the present invention has a remarkable effect over the conventional product B, as shown in FIG. Therefore, it is possible to achieve an accurate anticorrosion effect for a long period of time even in a severe corrosive environment, and the above object can be achieved.
［実施例］
本発明のアルミニウム製熱交換器をコンデンサの実施例
について第１図乃至第４図に基づき説明する。[Example] An example of the aluminum heat exchanger of the present invention as a condenser will be described with reference to FIGS. 1 to 4.
コンデンサの１−平チューブには冷媒の流れ方向に沿っ
て内部に複数の仕切り壁を設けて複数の穴が形成してあ
り、このチューブ２は１ｇ「定間隔を保って蛇行状に折
り曲げることによって、コンデンサの骨格が構成されて
おり、このチューブ２の平行ｆｉ １１には、アルミニ
ウム又はアルミニウム合金の極く薄肉でコルゲート形の
フィン３を挟持させ、このチューブ２とフィン３との間
をろう材により、ろう付することによりコア部１を形成
している。The 1-flat tube of the condenser has a plurality of partition walls and a plurality of holes formed therein along the flow direction of the refrigerant. , the skeleton of the capacitor is constructed, and the parallel fi 11 of this tube 2 has an extremely thin corrugated fin 3 made of aluminum or aluminum alloy sandwiched therebetween, and a brazing material is inserted between the tube 2 and the fin 3. The core portion 1 is formed by brazing.
チューブ２の両開口端には、冷律サイクルの冷媒配管に
接続するためのバイブ接手４．５がろう接合されている
。Vibe joints 4.5 are soldered to both open ends of the tube 2 for connection to refrigerant pipes of a refrigeration cycle.
このろう付されたコンデンサは、洗浄等の前処理を施し
、ＺｎＯ２，５〜９！３．７％のＺｎ−Ｆｅ合金のメツ
Ａ・洛中で、皮膜厚さを例えば５μｍ程度になるように
、全表面にＺｎ−Ｆｅ合金皮膜６が形成される。次にこ
のＺｎ−Ｆｅ合金皮膜が形成されたコンデンサは無水ク
ロム削を主体としたクロメート液中でクロメート処理を
施し、化成皮膜７が形成される。This brazed capacitor is subjected to pre-treatment such as cleaning, and then heated in a Zn-Fe alloy containing 5 to 9!3.7% ZnO2 to a film thickness of, for example, about 5 μm. A Zn-Fe alloy film 6 is formed on the entire surface. Next, the capacitor on which this Zn--Fe alloy film has been formed is subjected to chromate treatment in a chromate solution mainly consisting of anhydrous chromium abrasion to form a chemical conversion film 7.
上記構成における防食効果について説明する。The anticorrosion effect of the above structure will be explained.
コンデンサの表面に施したＺｎ−Ｆｅ合金皮膜は、Ｆｅ
の含有量が第３図で示すように０．３〜０゜５％に最大
の防食性能をイｆする知見に基づき採用したものであり
、Ｚｎ１００％皮膜より防食性能が茗しく優れている。The Zn-Fe alloy film applied to the surface of the capacitor is
This coating was adopted based on the knowledge that maximum corrosion resistance is achieved when the content of Zn is 0.3 to 0.5% as shown in FIG. 3, and the corrosion resistance is significantly superior to that of a 100% Zn film.
尚第３図はＺｎとＺｎ−Ｆｅ合金の防食性能を表す線図
で、横軸にＺｎと２ｎ−Ｆｅ合金の含有量を表し、縦軸
にＪＩＳ−Ｚ２３７１塩水噴四試験によるチューブ素地
の腐食発生までの時間を表している。又Ｚｎ−Ｆｅ合金
皮膜の上層に形成されているクロメート処理による化成
皮膜は最表面の腐食皮膜としての役割と共に下剤のＺｎ
−Ｆｅ含金ｊズ膜と相乗的な効果が得られる。即も第４
図に示す腐食試験による結果で解るようにチューブの゛
最大孔食深さは、本発明晶Ａが従来品Ｂに比し１７１０
程度に減少している。Figure 3 is a diagram showing the anticorrosion performance of Zn and Zn-Fe alloys, where the horizontal axis shows the content of Zn and 2n-Fe alloy, and the vertical axis shows the corrosion of the tube base by the JIS-Z2371 salt water spray test. It represents the time until occurrence. In addition, the chemical conversion film formed by chromate treatment on the upper layer of the Zn-Fe alloy film plays the role of the outermost corrosion film as well as the Zn laxative.
- A synergistic effect can be obtained with the Fe-containing gold film. Immediately the 4th
As can be seen from the results of the corrosion test shown in the figure, the maximum pitting depth of the tube was 1710 for crystal A of the present invention compared to conventional product B.
It has decreased to a certain extent.
尚第４図はＨｇＳＯ４を０．０５％含むＮａｃｌの５％
水溶液に２分間漠清し、４９”Ｃで２時間乾燥するサイ
クルｍ食試験を表す線図で、横軸にそのサイクル数、縦
軸にチューブの最大孔食深さを表している。Figure 4 shows 5% NaCl containing 0.05% HgSO4.
This is a diagram showing a cycle m corrosion test in which the tube is soaked in an aqueous solution for 2 minutes and dried at 49''C for 2 hours, with the horizontal axis representing the number of cycles and the vertical axis representing the maximum pitting depth of the tube.
」；記実施例はＺｎ−Ｆｅ合金皮膜をメツキ法で形成し
たものであるが、Ｆｅ系のシジット粒に２ｎ−Ｆｅ合金
を皮層させたもの或いはＺｎ−Ｆｅ合金の細粒を投射し
皮膜させる物理的方法、Ｚｎ−Ｆｅ合金の溶湯中に授渭
して皮膜させる方法停を採用して皮膜を形成しても同様
の効果が得られるものである。In the example described above, a Zn-Fe alloy film was formed by a plating method, but it was also possible to form a film by coating Fe-based cygitite grains with a 2n-Fe alloy, or by projecting fine grains of a Zn-Fe alloy. The same effect can be obtained even if a film is formed using a physical method or a method of injecting the Zn--Fe alloy into a molten metal to form a film.
［１明の効果Ｊ
以上詳述した如く、本イε明の表面皮膜形成によって、
特に真空ろう対決による熱交換器の防食性能が著しく向
上し、厳しい腐食ＭｉＩ境下での製品スＩ命を延ばすこ
とができるようになった。又Ｚｎを含有したフィン材を
使用する必要もなくなり、Ｚｎ−Ｆｅ合金皮膜材の材料
費も安価であり、史に塗装が不要となる作、経済的効果
も、大きいものである。[1 Effect of light J As detailed above, by forming a surface film of light,
In particular, the anti-corrosion performance of the heat exchanger due to vacuum brazing has been significantly improved, making it possible to extend the life of the product under severe corrosive conditions. In addition, there is no need to use a fin material containing Zn, the material cost of the Zn--Fe alloy coating material is low, and there is no need for painting, which has a great economic effect.
第１図は本発明の実施例におけるアルミニウム製熱交換
器を示す正面図、第２図は第１図の要部拡大断面図、第
３図は本発明の実施例における２ｎ−Ｆｅ合金皮膜の防
食性能を表す線図、第４図は本発明の実施例における熱
交換器の腐食試験結果を表す線図、第５図は従来例の熱
交換器の要部拡大断面図。
１・・・コア部、 ２・・・チューブ、 ３・・・
フィン、 ６・・・Ｚｎ−Ｆｅ合金皮膜、７・・・化成
皮膜。Fig. 1 is a front view showing an aluminum heat exchanger in an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Fig. 3 is a 2n-Fe alloy film in an embodiment of the present invention. FIG. 4 is a diagram showing corrosion protection performance, FIG. 4 is a diagram showing corrosion test results of a heat exchanger according to an embodiment of the present invention, and FIG. 5 is an enlarged sectional view of a main part of a conventional heat exchanger. 1... Core part, 2... Tube, 3...
Fin, 6...Zn-Fe alloy film, 7... Chemical conversion film.
Claims (1)
ルミニウム材フィンとを、炉中ろう付法により互いに接
合してなるコア部を備えたアルミニウム製熱交換器にお
いて、コア部表面にＺｎ−Ｆｅ合金からなる皮膜を下層
とし、上層にクロム酸系の化成皮膜を形成して、防食性
を向上させる事を特徴とするアルミニウム製熱交換器。In an aluminum heat exchanger equipped with a core formed by joining aluminum tubes and aluminum fins interposed between the tubes to each other by furnace brazing, the surface of the core is made of a Zn-Fe alloy. An aluminum heat exchanger characterized by having a film as the lower layer and a chromic acid-based chemical conversion film on the upper layer to improve corrosion resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4005988A JPH01217197A (en) | 1988-02-23 | 1988-02-23 | Heat exchanger made of aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4005988A JPH01217197A (en) | 1988-02-23 | 1988-02-23 | Heat exchanger made of aluminum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01217197A true JPH01217197A (en) | 1989-08-30 |
Family
ID=12570350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4005988A Pending JPH01217197A (en) | 1988-02-23 | 1988-02-23 | Heat exchanger made of aluminum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01217197A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3028023A1 (en) * | 2014-10-29 | 2016-05-06 | Fives Cryo | CORROSION RESISTANT HEAT EXCHANGER MATRIX AND METHOD FOR MANUFACTURING SUCH MATRIX |
-
1988
- 1988-02-23 JP JP4005988A patent/JPH01217197A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3028023A1 (en) * | 2014-10-29 | 2016-05-06 | Fives Cryo | CORROSION RESISTANT HEAT EXCHANGER MATRIX AND METHOD FOR MANUFACTURING SUCH MATRIX |
| WO2016066771A1 (en) * | 2014-10-29 | 2016-05-06 | Fives Cryo | Corrosion-resistant heat exchanger matrix and method of manufacturing such a matrix |
| CN107107226A (en) * | 2014-10-29 | 2017-08-29 | 法孚低温设备公司 | Corrosion-resistant heat exchanger matrix and the method for manufacturing the matrix |
| US10788274B2 (en) | 2014-10-29 | 2020-09-29 | Fives Cryo | Corrosion-resistant heat exchanger matrix and method of manufacturing such a matrix |
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