JPH035749Y2 - - Google Patents
Info
- Publication number
- JPH035749Y2 JPH035749Y2 JP9639387U JP9639387U JPH035749Y2 JP H035749 Y2 JPH035749 Y2 JP H035749Y2 JP 9639387 U JP9639387 U JP 9639387U JP 9639387 U JP9639387 U JP 9639387U JP H035749 Y2 JPH035749 Y2 JP H035749Y2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- coating film
- film
- connecting member
- powder coating
- 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.)
- Expired
Links
- 238000000576 coating method Methods 0.000 claims description 52
- 239000011248 coating agent Substances 0.000 claims description 50
- 238000007747 plating Methods 0.000 claims description 28
- 239000000843 powder Substances 0.000 claims description 25
- 229910045601 alloy Inorganic materials 0.000 claims description 16
- 239000000956 alloy Substances 0.000 claims description 16
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229920005989 resin Polymers 0.000 description 22
- 239000011347 resin Substances 0.000 description 22
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 11
- 229910000990 Ni alloy Inorganic materials 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 238000010422 painting Methods 0.000 description 9
- QELJHCBNGDEXLD-UHFFFAOYSA-N nickel zinc Chemical compound [Ni].[Zn] QELJHCBNGDEXLD-UHFFFAOYSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 206010042674 Swelling Diseases 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 102200029231 rs11551768 Human genes 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Joints With Pressure Members (AREA)
Description
［産業上の利用分野］
本考案は表面処理を施したパイプに関する。本
考案は自動車のパワーステアリングのオイル供給
等に使用する鉄鋼製のパイプに利用することがで
きる。
［従来の技術］
パイプ、例えばパワーステアリングのオイル供
給に使用するパイプが提供されている。パワース
テアリングのオイル供給に使用するパイプは、従
来より、第５図に示すように、鉄鋼製のパイプ本
体１００と、接続部材２００とからなる。ここ
で、パイプ本体１００は、外周径がほぼ同一のパ
イプストレート部１０１とパイプストレート部１
０１の一端部に連続し先端に向かうにつれて円錐
状に拡開するフレア部１０２とからなる。接続部
材２００は、筒状をなし、パイプ本体１００のフ
レア部１０２の最大外周径よりも小さくかつパイ
プストレート部１０１の外周径よりも大きな内周
径をもちパイプ本体１００に外側から嵌合する嵌
合孔２０１を有する。
この接続部材２００は、フレア部１０２に抜け
止めされている。接続部材２００外周壁面には、
ソケツト２０３をねじこむためのねじ部２０２が
形成されている。
ところで、パイプ本体１００の外壁面には、鉄
鋼の防錆表面処理として適する亜鉛メツキ膜１１
０が被覆されている。亜鉛は価格がやすく、極め
て卑な電位をもつため、腐蝕環境下で、みずから
溶出して鉄鋼を腐蝕から保護する。
さらに従来では、接続部材２００の嵌合孔２０
１を形成する壁面２０１ａに対向するパイプスト
レート部分１０１ａ、フレア部１０２を除き、そ
の亜鉛メツキ膜１１０の上にスプレー塗装した樹
脂塗装膜１１１が被覆され、防錆性を一層向上さ
せている。
亜鉛メツキ膜１１０の上に樹脂塗装膜１１１を
被覆するにあたつて、接続部材２００の嵌合孔２
０１を形成する壁面２０１ａに対向するパイプス
トレート部分１０１ａ、フレア部１０２を除いた
理由は、接続部材２００とパイプ本体１００との
間に所要のクリアランスを確保し、接続部材２０
０の軸芯方向および円周方向へのスライド性を確
保するためである。
［考案が解決しようとする問題点］
上記したパイプでは、亜鉛メツキ膜１１０の上
にスプレー塗装した樹脂塗装膜１１１の強度を確
保するため、スプレー塗装した樹脂塗装膜１１１
を焼付ける必要がある。この場合、樹脂塗装膜１
１１を高温焼付けした方が、樹脂塗装膜１１１の
強度を確保するためには好ましい。
しかし樹脂塗装膜１１１を高温焼付けすると、
亜鉛メツキ膜１１０が熱劣化してしまう。したが
つて、樹脂塗装膜１１１の脹れ、樹脂塗装膜１１
１の剥離などの問題が発生しやすかつた。また、
従来では樹脂塗装膜１１１が被覆されておらず亜
鉛メツキ膜１１０が露出している部分、即ち壁面
２０１ａに対向するパイプストレート部分１０１
ａ、フレア部１０２では、高温焼付けの際の熱影
響で亜鉛メツキ膜１１０に劣化が発生し、従つ
て、パイプの使用中に、露出している亜鉛メツキ
膜１１０に白サビがかなりの量で発生する問題が
あつた。
一方、焼付け温度が120〜150℃程度の低温焼き
つけタイプまたは常温タイプのスプレー塗装のも
ので、樹脂塗装膜１１１を形成すると、樹脂塗装
膜１１１の透水率が高くなり、樹脂塗装膜１１１
の強度、膜厚を確保するには限界があつた。ま
た、低温焼きつけタイプまたは常温タイプのスプ
レー塗装した樹脂塗装膜１１１は、下地への密着
力が弱く、柔軟性に乏しい。そのため、樹脂塗装
膜１１１を形成した塗装後のパイプ本体１００を
二次加工で曲げたりしたとき、樹脂塗装膜１１１
が割れる問題があつた。そのため樹脂塗装膜１１
１の割れを防止すべく、塗装の前にパイプを所定
形状に曲げ加工せざるを得ない。故に一直線状の
パイプ本体１００に塗装できず、複雑な形状に曲
げ加工したパイプ本体１００に塗装せざるを得な
いため、塗装のむらが生じ易く、塗装作業の能率
も低かつた。
本考案は上記した実情に鑑みなされたものであ
り、その目的は、パイプ本体の耐食性の向上、合
金メツキ膜の露出部の耐食性の向上、二次加工性
の向上、耐衝撃性の向上を図り得るパイプを提供
するにある。
［問題点を解決するための手段］
本考案にかかるパイプは、外周径がほぼ同一の
パイプストレート部と該パイプストレート部の少
なくとも一端部に連続し先端に向かうにつれて円
錐状に拡開するフレア部とからなるパイプ本体
と、
パイプ本体のフレア部の最大外周径よりも小さ
くかつパイプストレート部の外周径よりも大きな
内周径をもちパイプ本体に外側から嵌合する嵌合
孔を有し、フレア部に抜け止めされ外周壁面およ
び内周壁面のいずれか一方にねじ部をもつ接続本
体とで構成され、
パイプ本体は、
パイプストレート部およびフレア部の外壁面に
被覆された亜鉛−ニツケル系の合金メツキ膜と、
接続部材の嵌合孔を形成する壁面に対向するパイ
プストレート部分およびフレア部を除き、合金メ
ツキ膜上に焼付け硬化されて形成された粉体塗装
膜とをもつことを特徴とするものである。
ここで、粉体塗装膜は、シンナーなどの溶剤を
含まない塗装粉末をパイプ本体の外壁面の表面に
付着させ、これに熱を加えて焼付けた塗装膜であ
り、エポキシ系樹脂、アクリル系樹脂で形成する
ことができる。粉体塗装膜は、一般的に厚みが30
〜200μにできる。粉体塗装の手段としては静電
乾式法、静電煙霧法などを採ることができる。亜
鉛−ニツケル系の合金メツキ膜は、電気メツキ法
で形成され、一般的に厚みが２〜15μである。こ
の合金メツキ膜のニツケル含有量は、重量％で７
〜10％とすることができる。
［実施例］
以下、本考案にかかるパイプを自動車のパワー
ステアリングフイード用のパイプに適用した場合
について図面を参照して説明する。第１図は要部
の断面図、第２図は合金メツキ膜と粉体塗装膜と
の拡大断面図、第３図はパワーステアリングのポ
ンプに組付ける際の説明図、第４図は焼付け温度
と白サビの発生との関係を示すグラフである。
本実施例にかかるパイプは、第１図に示すよう
に、パイプ本体１と接続部材２とからなる。パイ
プ本体１は、外周径が同一のパイプストレート部
１０と、パイプストレート部１０の一端部１０ａ
に連続し先端に向かうにつれて円錐状に拡開する
フレア部１１とからなる。パイプ本体１の材質は
鉄鋼（S15C）である。
接続部材２は、他の部材を接続するものであ
り、パイプ本体１のフレア部１１の最大外周径よ
りも小さくかつパイプストレート部１０の外周径
よりも大きな内周径をもつ嵌合孔２０を有する。
嵌合孔２０はパイプ本体１に外側から嵌合され
る。接続部材２は、フレア部１１に抜け止めされ
外周壁面にねじ部２１をもつ。
本実施例にかかるパイプ本体１では、パイプス
トレート部１０およびフレア部１１の外壁面に亜
鉛−ニツケル系の合金メツキ膜１３が被覆されて
いる。そして、接続部材２の嵌合孔２０を形成す
る壁面２２に対向するパイプストレート部１０の
部分１０ｂおよびフレア部１１を除いて、亜鉛−
ニツケル系の合金メツキ膜１３上に粉体塗装膜１
４が焼付け硬化されて形成されている。部分１０
およびフレア部１１を除去したのは、従来と同様
に、接続部材２のスライド性確保の為である。こ
のようにスライド性を確保することができれば、
接続部材２のねじ部２１を他の部材にねじこむの
に都合が良い。
粉体塗装膜１４は、エポキシ系樹脂で形成さ
れ、厚みが50μである。亜鉛−ニツケル系の合金
メツキ膜１３は、ニツケルを重量で８％程度含有
しており、厚みが5μである。
次に、本実施例にかかるパイプの製造方法につ
いて説明する。銅メツキ鋼帯を螺旋状に２重に巻
いて原管としての直径8.0ミリメートルのパイプ
本体１を形成する。そしてパイプ本体１のパイプ
ストレート部１０の他端部１０ｃにニツプル５０
をロウ付けして取付ける。
さらに、パイプ本体１のパイプストレート部１
０の一端部１０ａに接続部材２の嵌合孔２０をは
めこみ、このように接続部材２をはめこんだ状態
で拡開加工して円錐形状のフレア部１１を形成す
る。フレア部１１で接続部材２は抜け止めされて
いる。次に、パイプ本体１のパイプストレート部
１０及びフレア部１１の外周面に亜鉛−ニツケル
系の合金で合金メツキ膜１３を被覆する。メツキ
条件としては、メツキ液のPHは5.6〜5.8、浴温は
33〜37℃、陰極電流密度は２〜6A／ｄm2、陽極
電流密度は１〜4A／ｄm2、陽極は亜鉛：ニツケ
ルの合金＝10：１、メツキ液の撹拌法はエア噴
出、ろか法は連続ろかとした。
そして、メツキ処理の後、粉体塗装膜１４を粉
体塗装法により形成した。この場合、180〜200℃
程度にて20分間焼付け硬化した。この場合前記し
たように、接続部材２の嵌合孔２０を形成する壁
面２２に対向するパイプストレート部１０の部分
１０ｂおよびフレア部１１を除いて、亜鉛−ニツ
ケル系の合金メツキ膜１３上に粉体塗装膜１４が
形成されているが、その部分１０ｂおよびフレア
部１１のマスキングはシリコンキヤツプにより行
なつた。このようにしてパイプ本体１に塗装を行
つた後、塗装したパイプ本体１を所定の形状に曲
げた。
上記のように製造したパイプを使用するにあた
つては、第３図にしめすように、ニツプル５０に
ソケツト５１を取付け、ポンプ５２側の直径12ミ
リメートルのパイプ５３のソケツト５４と、前記
ソケツト５１とを結合すると共に、接続部材２を
ギヤボツクス側につなぐ。
本実施例では、亜鉛−ニツケル系の合金メツキ
膜１３は、従来の亜鉛メツキ膜１１０とは異な
り、200℃で20分間程度の加熱では熱劣化をほと
んど生じない。よつて、粉体塗装膜１４が被覆さ
れておらず合金メツキ膜１３が露出する露出部
分、即ち、接続部材２の嵌合孔２０を形成する壁
面２２に対向するパイプストレート部１０の部分
１０ｂおよびフレア部１１に被覆されている合金
メツキ膜１３の熱劣化を防止できる。従つて合金
メツキ膜１３の露出部の耐食性を確保できる。
第４図は本実施例にかかるパイプにおいて焼付
け温度と白サビ面積率との関係を示すグラフであ
る。ここで本実施例の場合の試験結果を特性線Ａ
に示している。参考として、亜鉛メツキ膜１１０
を使用していた従来の場合の試験結果を第４図の
特性線Ｂに示す。第４図の特性線Ａに示すよう
に、本実施例では、焼付け温度が150℃を越えて
も、白サビ面積率はほとんど増加せず、低いまま
である。一方、特性線Ｂに示すように、亜鉛メツ
キ膜１１０が被覆されていた従来では、130〜150
℃を越えたあたりから急に白サビ面積率が増加す
る。上記のように本実施例では、焼付け温度が
150℃を越えても、白サビ面積率はほとんど増加
せず低いままであるので、160℃以上の高温焼付
けを必要とする粉体塗装膜１４を合金メツキ膜１
３上に被覆できる。ここで、粉体塗装膜１４は膜
厚を確保でき、透水率もスプレー塗装した樹脂塗
装膜１１１に比較して低いので、粉体塗装膜１４
の耐食性ひいてはパイプ本体１０の耐食性を確保
できる。
また本実施例では、粉体塗装膜１４の焼付けに
160℃以上の熱を加えた場合でも、熱劣化が生じ
にくい亜鉛−ニツケル系の合金からなる合金メツ
キ膜１３は、パイプ本体１からの浮きを生じにく
い。そのため、合金メツキ膜１３のパイプ本体１
への下地密着性を確保できる。しかも粉体塗装膜
１４を被覆した後、パイプ本体１を曲げることを
行つても、合金メツキ膜１３の剥離を抑制するこ
ともでき、故に、塗装後のパイプ本体１を曲げ加
工しても、粉体塗装膜１４の剥離の問題を解消で
き、パイプの二次加工性を向上できる。従つて、
パイプ本体１を塗装が行い易い一直線状態にした
ままパイプ本体１に塗装できるので、塗装むらの
問題を改善でき、塗装作業の能率も向上する。
また、粉体塗装膜１４はスプレー塗装した樹脂
塗装膜１１１よりも強度が大きいため、耐衝撃性
を確保でき、石跳ねがあつても、石跳ねによる傷
を受けにくい。
本実施例にかかるパイプと比較例にかかるパイ
プとについて各種の試験をした。比較例１の条件
は、亜鉛メツキ膜、スプレー塗装膜、焼付け温度
120〜150℃である。比較例２の条件は、亜鉛メツ
キ膜、粉体塗装膜、焼付け温度180〜200℃であ
る。耐食性についての試験方法は、塩水噴霧法
（JIS K6301）である。耐衝撃性についてはウエ
イトを落下させて行つた。試験結果を第１表に示
す。第１表に示すように、塗装部の耐食性につい
ては本実施例では、2000時間経過しても異常がな
かつたが、比較例１では1500時間で樹脂塗装膜１
１１の脹れが生じた。メツキ露出部の耐食性につ
いては、本実施例では
[Industrial Application Field] The present invention relates to a surface-treated pipe. The present invention can be used for steel pipes used for supplying oil to automobile power steering systems. [Prior Art] Pipes, for example, pipes used for supplying oil to power steering systems, are provided. A pipe used for supplying oil to a power steering system has conventionally been made up of a pipe body 100 made of steel and a connecting member 200, as shown in FIG. Here, the pipe main body 100 has a pipe straight part 101 and a pipe straight part 1 having substantially the same outer diameter.
01 and a flared portion 102 that extends conically toward the tip. The connecting member 200 has a cylindrical shape, has an inner circumferential diameter smaller than the maximum outer circumferential diameter of the flare portion 102 of the pipe body 100 and larger than the outer circumferential diameter of the pipe straight portion 101, and is a fitting that fits into the pipe body 100 from the outside. It has a matching hole 201. This connecting member 200 is prevented from coming off by the flare portion 102. On the outer peripheral wall of the connecting member 200,
A threaded portion 202 is formed into which a socket 203 is screwed. By the way, the outer wall surface of the pipe body 100 is coated with a galvanized film 11 suitable for rust-preventing surface treatment of steel.
0 is covered. Zinc is inexpensive and has an extremely base potential, so it dissolves by itself in corrosive environments and protects steel from corrosion. Furthermore, conventionally, the fitting hole 20 of the connecting member 200
A resin coating film 111 spray-painted is coated on the galvanized film 110, except for the pipe straight part 101a facing the wall surface 201a forming the pipe 1, and the flare part 102, thereby further improving rust prevention. When coating the resin coating film 111 on the galvanized film 110, the fitting hole 2 of the connecting member 200 is
The reason for excluding the pipe straight portion 101a and the flare portion 102 that face the wall surface 201a forming the pipe 01 is to ensure the required clearance between the connecting member 200 and the pipe body 100, and to ensure that the connecting member 20
This is to ensure slideability in the axial direction and the circumferential direction. [Problems to be solved by the invention] In the above pipe, in order to ensure the strength of the resin coating film 111 spray-painted on the galvanized film 110, the spray-painted resin coating film 111 is
It is necessary to burn it. In this case, resin coating film 1
11 is preferably baked at a high temperature in order to ensure the strength of the resin coating film 111. However, when the resin coating film 111 is baked at high temperature,
The galvanized film 110 deteriorates due to heat. Therefore, the resin coating film 111 swells and the resin coating film 11
Problems such as peeling of No. 1 were likely to occur. Also,
Conventionally, the part where the resin coating film 111 is not coated and the galvanized film 110 is exposed, that is, the pipe straight part 101 facing the wall surface 201a.
a. In the flare part 102, the galvanized film 110 deteriorates due to the heat effect during high-temperature baking, and therefore, while the pipe is in use, a considerable amount of white rust forms on the exposed galvanized film 110. There was a problem that occurred. On the other hand, when the resin coating film 111 is formed with a low-temperature baking type with a baking temperature of about 120 to 150°C or a room temperature type spray coating, the water permeability of the resin coating film 111 becomes high, and the resin coating film 111
There were limits to securing the strength and thickness of the film. In addition, the low-temperature baking type or room temperature type spray-painted resin coating film 111 has weak adhesion to the base and lacks flexibility. Therefore, when the painted pipe body 100 on which the resin coating film 111 is formed is bent during secondary processing, the resin coating film 111
I had a problem with it cracking. Therefore, the resin coating film 11
In order to prevent cracking in step 1, the pipe must be bent into a predetermined shape before painting. Therefore, the straight pipe body 100 cannot be coated, and the pipe body 100 bent into a complicated shape must be coated, which tends to cause uneven coating and lower the efficiency of the painting work. The present invention was developed in view of the above-mentioned circumstances, and its purpose is to improve the corrosion resistance of the pipe body, the exposed part of the alloy plating film, the secondary processability, and the impact resistance. There is a pipe to provide you with. [Means for Solving the Problems] The pipe according to the present invention includes a pipe straight portion having approximately the same outer circumferential diameter and a flared portion that is continuous with at least one end of the pipe straight portion and widens conically toward the tip. and a fitting hole that fits into the pipe body from the outside and has an inner circumferential diameter smaller than the maximum outer circumferential diameter of the flared part of the pipe body and larger than the outer circumferential diameter of the straight pipe part; The pipe body is made of a zinc-nickel alloy coated on the outer wall surfaces of the straight section and the flared section of the pipe. Metsuki membrane,
The pipe is characterized by having a powder coating film formed by baking and hardening on the alloy plating film, except for the pipe straight part and the flare part facing the wall surface forming the fitting hole of the connecting member. Here, the powder coating film is a coating film made by attaching coating powder that does not contain solvents such as thinner to the surface of the outer wall of the pipe body and baking it by applying heat. can be formed with. Powder coating film is generally 30mm thick
~200μ can be achieved. As a powder coating method, an electrostatic dry method, an electrostatic atomization method, etc. can be used. A zinc-nickel alloy plating film is formed by electroplating and generally has a thickness of 2 to 15 μm. The nickel content of this alloy plating film is 7% by weight.
It can be ~10%. [Example] Hereinafter, a case where the pipe according to the present invention is applied to a pipe for a power steering feed of an automobile will be described with reference to the drawings. Figure 1 is a cross-sectional view of the main parts, Figure 2 is an enlarged cross-sectional view of the alloy plating film and powder coating film, Figure 3 is an explanatory diagram when assembled to a power steering pump, and Figure 4 is the baking temperature. It is a graph showing the relationship between the occurrence of white rust and the occurrence of white rust. The pipe according to this embodiment consists of a pipe body 1 and a connecting member 2, as shown in FIG. The pipe body 1 includes a pipe straight portion 10 having the same outer circumferential diameter and one end portion 10a of the pipe straight portion 10.
It consists of a flared part 11 that continues into the flaring part 11 and widens into a conical shape as it goes toward the tip. The material of the pipe body 1 is steel (S15C). The connecting member 2 is for connecting other members, and has a fitting hole 20 having an inner circumferential diameter smaller than the maximum outer circumferential diameter of the flare portion 11 of the pipe body 1 and larger than the outer circumferential diameter of the pipe straight portion 10. have
The fitting hole 20 is fitted into the pipe body 1 from the outside. The connecting member 2 is secured by the flare portion 11 and has a threaded portion 21 on the outer peripheral wall surface. In the pipe body 1 according to this embodiment, the outer wall surfaces of the pipe straight section 10 and flare section 11 are coated with a zinc-nickel alloy plating film 13. Then, excluding the portion 10b and the flared portion 11 of the pipe straight portion 10 facing the wall surface 22 forming the fitting hole 20 of the connecting member 2, zinc-
Powder coating film 1 on nickel alloy plating film 13
4 is baked and hardened. part 10
The reason why the flare portion 11 is removed is to ensure the slidability of the connecting member 2, as in the conventional case. If you can ensure sliding properties like this,
This is convenient for screwing the threaded portion 21 of the connecting member 2 into another member. The powder coating film 14 is made of epoxy resin and has a thickness of 50 μm. The zinc-nickel alloy plating film 13 contains about 8% nickel by weight and has a thickness of 5 μm. Next, a method for manufacturing a pipe according to this example will be explained. A copper-plated steel strip is spirally wound twice to form a pipe body 1 having a diameter of 8.0 mm as a master pipe. A nipple 50 is attached to the other end 10c of the pipe straight portion 10 of the pipe body 1.
Attach by brazing. Furthermore, the pipe straight part 1 of the pipe body 1
0 is fitted into the fitting hole 20 of the connecting member 2, and with the connecting member 2 fitted in this way, it is expanded to form a conical flare portion 11. The connecting member 2 is prevented from coming off by the flare portion 11. Next, the outer circumferential surfaces of the pipe straight section 10 and flare section 11 of the pipe body 1 are coated with an alloy plating film 13 made of a zinc-nickel alloy. As for the plating conditions, the pH of the plating liquid is 5.6 to 5.8, and the bath temperature is
33~37℃, cathode current density 2~6A/ dm2 , anode current density 1~4A/ dm2 , anode zinc:nickel alloy = 10:1, stirring method of plating solution: air jet, filtration method. was continuous. After plating, a powder coating film 14 was formed by a powder coating method. In this case, 180-200℃
It was baked and hardened for 20 minutes at a moderate temperature. In this case, as described above, the powder is coated on the zinc-nickel alloy plating film 13, except for the portion 10b of the pipe straight portion 10 facing the wall surface 22 forming the fitting hole 20 of the connecting member 2, and the flare portion 11. Although a body coating film 14 is formed, its portion 10b and flared portion 11 are masked with a silicone cap. After painting the pipe body 1 in this manner, the painted pipe body 1 was bent into a predetermined shape. When using the pipe manufactured as described above, a socket 51 is attached to the nipple 50 as shown in FIG. At the same time, the connecting member 2 is connected to the gearbox side. In this embodiment, unlike the conventional zinc plating film 110, the zinc-nickel alloy plating film 13 hardly undergoes thermal deterioration when heated at 200° C. for about 20 minutes. Therefore, the exposed portion where the powder coating film 14 is not coated and the alloy plating film 13 is exposed, that is, the portion 10b of the pipe straight portion 10 facing the wall surface 22 forming the fitting hole 20 of the connecting member 2; Thermal deterioration of the alloy plating film 13 covering the flare portion 11 can be prevented. Therefore, the corrosion resistance of the exposed portion of the alloy plating film 13 can be ensured. FIG. 4 is a graph showing the relationship between baking temperature and white rust area ratio in the pipe according to this example. Here, the test results for this example are expressed as characteristic line A.
It is shown in For reference, galvanized film 110
Characteristic line B in FIG. 4 shows the test results for the conventional case in which the As shown by characteristic line A in FIG. 4, in this example, even if the baking temperature exceeds 150° C., the area ratio of white rust hardly increases and remains low. On the other hand, as shown in characteristic line B, in the conventional case where the galvanized film 110 was coated,
Once the temperature exceeds ℃, the white rust area ratio suddenly increases. As mentioned above, in this example, the baking temperature is
Even if the temperature exceeds 150°C, the area ratio of white rust hardly increases and remains low.
3 can be coated. Here, since the powder coating film 14 can ensure a sufficient film thickness and has a lower water permeability than the spray-painted resin coating film 111, the powder coating film 14
Therefore, the corrosion resistance of the pipe body 10 can be ensured. Furthermore, in this embodiment, the powder coating film 14 is baked.
The alloy plating film 13 made of a zinc-nickel alloy that does not easily undergo thermal deterioration even when heat of 160° C. or more is applied is unlikely to lift off from the pipe body 1. Therefore, the pipe body 1 of the alloy plating film 13
Ensures good adhesion to the base. Moreover, even if the pipe body 1 is bent after being coated with the powder coating film 14, peeling of the alloy plating film 13 can be suppressed. Therefore, even if the pipe body 1 is bent after being coated, The problem of peeling of the powder coating film 14 can be solved, and the secondary processability of the pipe can be improved. Therefore,
Since the pipe body 1 can be painted while keeping the pipe body 1 in a straight line state where it is easy to paint, the problem of uneven coating can be improved and the efficiency of the painting work can also be improved. In addition, since the powder coating film 14 has greater strength than the spray-painted resin coating film 111, it can ensure impact resistance and is less likely to be damaged by stones even if it is hit by stones. Various tests were conducted on the pipe according to the present example and the pipe according to the comparative example. The conditions for Comparative Example 1 are galvanized film, spray painted film, and baking temperature.
The temperature is 120-150℃. The conditions for Comparative Example 2 are a galvanized film, a powder coated film, and a baking temperature of 180 to 200°C. The test method for corrosion resistance is the salt spray method (JIS K6301). Impact resistance was tested by dropping weights. The test results are shown in Table 1. As shown in Table 1, regarding the corrosion resistance of the painted area, in this example, there was no abnormality even after 2000 hours, but in Comparative Example 1, the resin coating film changed after 1500 hours.
11 swellings occurred. Regarding the corrosion resistance of exposed plating parts, in this example,
【表】
72時間で白サビ面積率は３％であつたが、比較
例１では72時間で白サビ面積率は50％となつた。
比較例２では72時間で白サビ面積率は80％となつ
た。又、塗装外観については、本実施例及び比較
例１では良好であつたが、比較例２では、しわ、
脹れがかなり生じ、塗装外観は悪かつた。耐衝撃
性については、本実施例では、1000ｇのウエイト
を50cmの高さから落下しても粉体塗装膜１４は割
れなかつたが、比較例１、比較例２では500ｇの
ウエイトを30cmの高さから落下したら樹脂塗装膜
１１１は割れた。塗装完了後の二次加工性につい
ては、本実施例では良好であつたが、比較例１、
比較例２では、塗装完了後にパイプを二次加工し
たら樹脂塗装膜１１１は剥離した。
［考案の効果］
本考案にかかるパイプでは、パイプ本体の耐食
性の向上、合金メツキ膜の露出部の耐食性の向
上、耐衝撃性の向上を確保できる。また、従来で
は塗装の前にパイプを所定形状に曲げて二次加工
をせざるを得ないが、本考案にかかるパイプで
は、粉体塗装膜の強度が大きくため、塗装後にパ
イプを二次加工することができる。従つて、パイ
プを直線状態にしたままパイプに塗装できるの
で、塗装むらの問題を改善でき、塗装作業の能率
も向上する。[Table] The white rust area ratio was 3% after 72 hours, but in Comparative Example 1, the white rust area ratio was 50% after 72 hours.
In Comparative Example 2, the white rust area ratio reached 80% in 72 hours. In addition, the paint appearance was good in this Example and Comparative Example 1, but in Comparative Example 2, there were wrinkles and
Significant swelling occurred and the appearance of the paint was poor. Regarding impact resistance, in this example, the powder coating film 14 did not crack even when a 1000g weight was dropped from a height of 50cm, but in Comparative Examples 1 and 2, a 500g weight was dropped from a height of 30cm. When it fell from the top, the resin coating film 111 cracked. Regarding the secondary workability after completion of painting, this example had good properties, but Comparative Example 1,
In Comparative Example 2, the resin coating film 111 peeled off when the pipe was subjected to secondary processing after the coating was completed. [Effects of the invention] The pipe according to the invention can ensure improved corrosion resistance of the pipe body, improved corrosion resistance of the exposed portion of the alloy plating film, and improved impact resistance. In addition, in the past, the pipe had to be bent into a predetermined shape and subjected to secondary processing before painting, but with the pipe according to the present invention, the strength of the powder coating film is high, so the pipe is subjected to secondary processing after painting. can do. Therefore, since the pipe can be painted while keeping the pipe in a straight state, the problem of uneven painting can be improved and the efficiency of the painting work can also be improved.
図面は本考案の一実施例をしめし、第１図は要
部の断面図、第２図は合金メツキ膜と粉体塗装膜
との断面図、第３図はパワーステアリングのポン
プに組付ける際のパイプの側面図、第４図は焼付
け温度と白サビの発生との関係を示すグラフであ
る。第５図は従来のパイプの要部の断面図であ
る。
図中、１はパイプ本体、１０はパイプストレー
ト部、１１はフレア部、１３は合金メツキ膜、１
４は粉体塗装膜、２は接続部材、２０は嵌合孔、
２１はねじ部を示す。
The drawings show one embodiment of the present invention. Figure 1 is a cross-sectional view of the main parts, Figure 2 is a cross-sectional view of the alloy plating film and the powder coating film, and Figure 3 is a cross-sectional view of the main part when assembled into a power steering pump. FIG. 4 is a graph showing the relationship between the baking temperature and the occurrence of white rust. FIG. 5 is a sectional view of the main part of a conventional pipe. In the figure, 1 is the pipe body, 10 is the pipe straight part, 11 is the flare part, 13 is the alloy plating film, 1
4 is a powder coating film, 2 is a connecting member, 20 is a fitting hole,
21 indicates a threaded portion.
Claims (1)
パイプストレート部の少なくとも一端部に連続
し先端に向かうにつれて円錐状に拡開するフレ
ア部とからなるパイプ本体と、 該パイプ本体の該フレア部の最大外周径より
も小さくかつ該パイプストレート部の外周径よ
りも大きな内周径をもち該パイプ本体に外側か
ら嵌合する嵌合孔を有し、該フレア部に抜け止
めされ外周壁面および内周壁面のいずれか一方
にねじ部をもつ接続部材とで構成され、 上記パイプ本体は、 上記パイプストレート部および上記フレア部
の外壁面に被覆された亜鉛−ニツケル系の合金
メツキ膜と、 上記接続部材の上記嵌合孔を形成する壁面に
対向する上記パイプストレート部分および上記
フレア部を除き、上記合金メツキ膜上に焼付け
硬化されて形成された粉体塗装膜とをもつこと
を特徴とするパイプ。 (2) 粉体塗装膜は、エポキシ系樹脂で形成されて
いることを特徴とする実用新案登録請求の範囲
第１項記載のパイプ。 (3) 合金メツキ膜は、厚みが２〜15μであり、粉
体塗装膜は、厚みが30〜200μである実用新案
登録請求の範囲第１項記載のパイプ。[Claims for Utility Model Registration] (1) A pipe main body consisting of a pipe straight section with approximately the same outer circumferential diameter and a flared section that is continuous with at least one end of the pipe straight section and widens into a conical shape toward the tip. , a fitting hole having an inner circumferential diameter smaller than the maximum outer circumferential diameter of the flared portion of the pipe body and larger than the outer circumferential diameter of the pipe straight portion and fitting into the pipe body from the outside; and a connecting member that is prevented from coming off and has a threaded portion on either the outer circumferential wall surface or the inner circumferential wall surface. and a powder coating film formed by baking and hardening on the alloy plating film, excluding the pipe straight portion and the flared portion facing the wall surface forming the fitting hole of the connecting member. A pipe characterized by having. (2) The pipe according to claim 1, wherein the powder coating film is made of epoxy resin. (3) The pipe according to claim 1, wherein the alloy plating film has a thickness of 2 to 15 μm, and the powder coating film has a thickness of 30 to 200 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9639387U JPH035749Y2 (en) | 1987-06-23 | 1987-06-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9639387U JPH035749Y2 (en) | 1987-06-23 | 1987-06-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS643185U JPS643185U (en) | 1989-01-10 |
| JPH035749Y2 true JPH035749Y2 (en) | 1991-02-14 |
Family
ID=31321289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9639387U Expired JPH035749Y2 (en) | 1987-06-23 | 1987-06-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH035749Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014059051A (en) * | 2012-06-29 | 2014-04-03 | Ti Automotive (Heidelberg) Gmbh | Connection unit composed of vehicle tube pipeline and joint |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6111814B2 (en) * | 2013-04-19 | 2017-04-12 | 日産自動車株式会社 | Rust prevention structure for metal piping and manufacturing method thereof |
-
1987
- 1987-06-23 JP JP9639387U patent/JPH035749Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014059051A (en) * | 2012-06-29 | 2014-04-03 | Ti Automotive (Heidelberg) Gmbh | Connection unit composed of vehicle tube pipeline and joint |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS643185U (en) | 1989-01-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH035749Y2 (en) | ||
| GB2173424A (en) | Anticorrosive coated steel pipe | |
| CN113249713A (en) | Copper alloy workpiece plated with nickel-phosphorus alloy layer and application of copper alloy workpiece in corrosion prevention of stainless steel product | |
| US5422192A (en) | Steel product with heat-resistant, corrosion-resistant plating layers | |
| CN214838709U (en) | Fire control valve foundry goods of long service life | |
| CN214534966U (en) | Interface bush structure based on compound pipe of anticorrosive metal lining | |
| JP2013253306A (en) | Coated stainless steel member | |
| US6308349B2 (en) | Sanitary tub | |
| US5023115A (en) | Method of forming coatings in coated tubular metal members | |
| CN207513724U (en) | Oil injector body and its fuel injector | |
| CN219262898U (en) | Antifatigue galvanized component | |
| CN211853058U (en) | Large-diameter special triple anti-corrosion plastic-coated steel pipe | |
| JPS63161193A (en) | Hanger for plating | |
| JPH0329671Y2 (en) | ||
| JP3416787B2 (en) | Painted steel pipe | |
| CN212427510U (en) | Steel construction that antirust effect is good | |
| JPS5854199B2 (en) | Anti-corrosion coating method | |
| JP2668419B2 (en) | Heat resistant and corrosion resistant multi-layer coated steel pipe | |
| CN214093609U (en) | Electromechanical engineering antidetonation support of long service life | |
| CN216078667U (en) | Seamless steel pipe with good corrosion resistance effect | |
| CN213114976U (en) | Steel structure for assembly type building | |
| CN219692489U (en) | Antibacterial stainless steel pipe fitting | |
| CN218323467U (en) | Color steel plate with good corrosion resistance effect | |
| CN213416731U (en) | High-strength customized metal plate | |
| JPH048680B2 (en) |