JP6106530B2 - アルミニウム押出形材製熱交換管外面の防食処理方法および熱交換器の製造方法 - Google Patents
アルミニウム押出形材製熱交換管外面の防食処理方法および熱交換器の製造方法 Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
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- 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
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- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0012—Brazing heat exchangers
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- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
- B21D53/085—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal with fins places on zig-zag tubes or parallel tubes
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- F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
- F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
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- F28F21/081—Heat exchange elements made from metals or metal alloys
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- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/089—Coatings, claddings or bonding layers made from metals or metal alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/12—Applying particulate materials
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- B05D1/00—Processes for applying liquids or other fluent materials
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- B05D2202/00—Metallic substrate
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- B05D2202/25—Metallic substrate based on light metals based on Al
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
- F28F2001/428—Particular methods for manufacturing outside or inside fins
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- F28—HEAT EXCHANGE IN GENERAL
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- F28F2275/00—Fastening; Joining
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Description
Mn0.2〜0.3質量%、Cu0.05質量%以下、Fe0.2質量%以下を含み、残部Alおよび不可避不純物からなる合金により形成されており、かつ管壁の肉厚が200μm以下であるアルミニウム押出形材製熱交換管を用意すること、
フラックス粉末と、平均粒径3〜5μmでかつ最大粒径が10μm未満のZn粉末とをバインダーに分散混合させた分散液を、前記熱交換管の外面に塗布するとともに分散液中の液状成分を気化させることによって、熱交換管の外面に、Zn粉末付着量が1〜3g/m2、フラックス粉末付着量が15g/m2以下、Zn粉末付着量に対するフラックス粉末付着量の比率(フラックス粉末付着量/Zn粉末付着量)が1以上となるように、Zn粉末およびフラックス粉末を付着させること、
ならびに熱交換管の温度を上昇させることによって、Zn粉末を溶融させた後にZnを熱交換管の外面表層部に拡散させることにより、熱交換管の外面表層部にZn拡散層を形成することを含むアルミニウム押出形材製熱交換管外面の防食処理方法。
フラックス粉末と、平均粒径3〜5μmでかつ最大粒径が10μm未満のZn粉末とをバインダーに分散混合させた分散液を、前記熱交換管の外面に塗布するとともに分散液中の液状成分を気化させることによって、熱交換管の外面に、Zn粉末付着量が1〜3g/m2、フラックス粉末付着量が15g/m2以下、Zn粉末付着量に対するフラックス粉末付着量の比率(フラックス粉末付着量/Zn粉末付着量)が1以上となるように、Zn粉末およびフラックス粉末を付着させること、
ならびに熱交換管およびフィンを組み合わせて加熱し、熱交換管の外面に付着したフラックス粉末およびフィンの皮材を利用して熱交換管とフィンとをろう付するとともに、熱交換管の外面に付着したZn粉末を溶融させた後にZnを熱交換管の外面表層部に拡散させることにより、熱交換管の外面表層部にZn拡散層を形成することを含む熱交換器の製造方法。
Mn0.25質量%を含み、残部Alおよび不可避不純物からなり、不可避不純物であるCu含有量が0質量%、同じくFe含有量が0.2質量%以下である合金を用いて、図2に示す横断面形状を有し、幅12mm、長さ650mm、管壁の最厚肉部分の肉厚が200μmであるアルミニウム押出形材製熱交換管を形成した。また、Si0.45質量%、Mn1.5質量%、Zn1.5質量%を含み、残部Alおよび不可避不純物からなるアルミニウム製芯材、およびSi8.7質量%を含み、残部Alおよび不可避不純物からなりかつ芯材の両面を覆うアルミニウムろう材製皮材よりなる肉厚70μmのブレージングシートを用いてコルゲート状フィンを形成した。
上述した実施例1と同様な熱交換管、コルゲートフィン、非腐食性フラックス粉末、Zn粉末、バインダーおよび希釈剤を用意した。
Cu0.45質量%、Zn5.0質量%を含み、残部Alおよび不可避不純物からなる合金を用いて、図2に示す横断面形状を有し、幅12mm、長さ650mm、管壁の最厚肉部分の肉厚が200μmであるアルミニウム押出形材製熱交換管を形成した。
実施例1〜2および比較例で得られた熱交換管とコルゲートフィンとのろう付体について、SWAAT960hr試験を施してその腐食状況を調べた結果、実施例1のろう付体の熱交換管の外面に発生した腐食の最大腐食深さは45μmであり、実施例2のろう付体の熱交換管の外面に発生した腐食の最大腐食深さは53μmであった。これに対し、比較例のろう付体の熱交換管の外面に発生した最大腐食深さは70μmであった。
(4):アルミニウム押出形材製扁平状熱交換管
(5):フィン
(15):フラックス粉末層
(16):Zn粉末
Claims (6)
- アルミニウム押出形材製熱交換管の外面に防食処理を施す方法であって、
Mn0.2〜0.3質量%、Cu0.05質量%以下、Fe0.2質量%以下を含み、残部Alおよび不可避不純物からなる合金により形成されており、かつ管壁の肉厚が200μm以下であるアルミニウム押出形材製熱交換管を用意すること、
フラックス粉末と、平均粒径3〜5μmでかつ最大粒径が10μm未満のZn粉末とをバインダーに分散混合させた分散液を、前記熱交換管の外面に塗布するとともに分散液中の液状成分を気化させることによって、熱交換管の外面に、Zn粉末付着量が1〜3g/m2、フラックス粉末付着量が15g/m2以下、Zn粉末付着量に対するフラックス粉末付着量の比率(フラックス粉末付着量/Zn粉末付着量)が1以上となるように、Zn粉末およびフラックス粉末を付着させること、
ならびに熱交換管の温度を上昇させることによって、Zn粉末を溶融させた後にZnを熱交換管の外面表層部に拡散させることにより、熱交換管の外面表層部にZn拡散層を形成することを含むアルミニウム押出形材製熱交換管外面の防食処理方法。 - 熱交換管外面への分散液の塗布を噴霧法により行い、その後分散液中の液状成分を気化させることにより、熱交換管の外面にZn粉末およびフラックス粉末を付着させる請求項1記載のアルミニウム押出形材製熱交換管外面の防食処理方法。
- 熱交換管外面を予め加熱した状態で、熱交換管外面への分散液の塗布をロールコート法により行い、その後分散液中の液状成分を気化させることにより、熱交換管の外面にZn粉末およびフラックス粉末を付着させる請求項1記載のアルミニウム押出形材製熱交換管外面の防食処理方法。
- Mn0.2〜0.3質量%、Cu0.05質量%以下、Fe0.2質量%以下を含み、残部Alおよび不可避不純物からなる合金により形成されており、かつ管壁の肉厚が200μm以下であるアルミニウム押出形材製熱交換管と、アルミニウム製芯材および芯材の両面を覆うアルミニウムろう材製皮材からなるブレージングシートにより形成されたフィンとを用意すること、
フラックス粉末と、平均粒径3〜5μmでかつ最大粒径が10μm未満のZn粉末とをバインダーに分散混合させた分散液を、前記熱交換管の外面に塗布するとともに分散液中の液状成分を気化させることによって、熱交換管の外面に、Zn粉末付着量が1〜3g/m2、フラックス粉末付着量が15g/m2以下、Zn粉末付着量に対するフラックス粉末付着量の比率(フラックス粉末付着量/Zn粉末付着量)が1以上となるように、Zn粉末およびフラックス粉末を付着させること、
ならびに熱交換管およびフィンを組み合わせて加熱し、熱交換管の外面に付着したフラックス粉末およびフィンの皮材を利用して熱交換管とフィンとをろう付するとともに、熱交換管の外面に付着したZn粉末を溶融させた後にZnを熱交換管の外面表層部に拡散させることにより、熱交換管の外面表層部にZn拡散層を形成することを含む熱交換器の製造方法。 - 熱交換管外面への分散液の塗布を噴霧法により行い、その後分散液中の液状成分を気化させることにより、熱交換管の外面にZn粉末およびフラックス粉末を付着させる請求項4記載の熱交換器の製造方法。
- 熱交換管外面を予め加熱した状態で、熱交換管外面への分散液の塗布をロールコート法により行い、その後分散液中の液状成分を気化させることにより、熱交換管の外面にZn粉末およびフラックス粉末を付着させる請求項4記載の熱交換器の製造方法。
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