JPH09279357A - Inside surface plating method for long-sized metallic pipe - Google Patents
Inside surface plating method for long-sized metallic pipeInfo
- Publication number
- JPH09279357A JPH09279357A JP9155396A JP9155396A JPH09279357A JP H09279357 A JPH09279357 A JP H09279357A JP 9155396 A JP9155396 A JP 9155396A JP 9155396 A JP9155396 A JP 9155396A JP H09279357 A JPH09279357 A JP H09279357A
- Authority
- JP
- Japan
- Prior art keywords
- long
- metallic pipe
- long metal
- metal tube
- temp
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Chemically Coating (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、長尺金属管内面に
金属被覆層を形成する長尺金属管内面めっき方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for plating an inner surface of a long metal tube, which comprises forming a metal coating layer on the inner surface of the long metal tube.
【０００２】[0002]
【従来の技術】従来、上水道の給水用配管などの材料な
どとしては、鋼管、銅管、鉛管などの長尺金属管が用い
られる。これらの長尺金属管では、その内面にめっきに
よって耐食性の金属被覆層を形成してその耐食性や耐摩
耗性を向上させたものを用いる場合がある。そして、こ
の長尺金属管の長尺金属管内面めっき方法としては、例
えば、無電解めっき液を長尺銅管内に連続的に通液し
て、Ｓｎを無電解めっきする方法が提案されている（特
開平４−４５２８２号公報）。この長尺金属管内面めっ
き方法においては、常温では金属被覆層の形成速度が遅
く、その生産効率が低いので、この生産効率をあげるた
めに、ある程度めっき温度を高温にすることが望ましい
とされている。2. Description of the Related Art Conventionally, long metal pipes such as steel pipes, copper pipes and lead pipes have been used as materials for water supply pipes for waterworks. In these long metal pipes, there may be used those in which a corrosion-resistant metal coating layer is formed on the inner surface by plating to improve the corrosion resistance and wear resistance. As a method for plating the inner surface of the long metal tube, for example, a method has been proposed in which an electroless plating solution is continuously passed through the long copper tube to perform Sn electroless plating. (Japanese Patent Laid-Open No. 4-45282). In this long metal pipe inner surface plating method, the formation rate of the metal coating layer is slow at room temperature, and its production efficiency is low.Therefore, it is desirable to raise the plating temperature to some extent in order to increase this production efficiency. There is.
【０００３】[0003]
【発明が解決しようとする課題】ところで、無電解めっ
きによって形成される金属被覆層の膜厚は、その温度条
件に大きく左右されるため、この膜厚を均一にするに
は、前記長尺金属管全体の温度条件を一定にしなければ
ならない。By the way, since the film thickness of the metal coating layer formed by electroless plating greatly depends on its temperature condition, in order to make this film thickness uniform, the above-mentioned long metal The temperature conditions of the whole tube must be constant.
【０００４】しかし、例えば、この長尺金属管にリボン
ヒータを巻き付けたり、所定の温度にした水浴中にこの
長尺金属管外面を浸すなどの従来の加熱方法では、この
長尺金属管全体の温度を均一に保つことは難しく、中で
もその両端部の加熱状態を他の部分と均一にすることが
困難であった。また、加熱装置が大型化したり、手間が
かかったりするという問題もあった。本発明は前記事情
に鑑みてなされたもので、長尺金属管全体の温度を簡便
な加熱装置によって一定にすることができ、長尺金属管
内面に均一な膜厚の金属被覆層を、容易に、効率よく形
成することができる長尺金属管内面めっき方法を提供す
ることを目的とする。However, according to the conventional heating method such as winding a ribbon heater around the long metal tube or immersing the outer surface of the long metal tube in a water bath at a predetermined temperature, the entire length of the long metal tube is reduced. It was difficult to keep the temperature uniform, and in particular, it was difficult to make the heating state at both ends uniform with other portions. In addition, there is a problem that the heating device becomes large in size and time-consuming. The present invention has been made in view of the above circumstances, and the temperature of the entire long metal tube can be made constant by a simple heating device, and a metal coating layer having a uniform thickness can be easily formed on the inner surface of the long metal tube. Another object of the present invention is to provide a method for plating the inner surface of a long metal tube, which can be efficiently formed.
【０００５】[0005]
【課題を解決するための手段】本発明の長尺金属管内面
めっき方法においては、長尺金属管を通電加熱しつつ、
無電解めっき液をこの長尺金属管内に連続的に通液する
ことを前記課題の解決手段とした。また、長尺金属管を
通電加熱して、めっき温度以上に予備加熱し、この長尺
金属管を通電加熱しつつ、予めめっき温度以上に加熱し
た無電解めっき液をこの長尺金属管内に連続的に通液す
ることもできる。In the method for plating the inner surface of a long metal tube according to the present invention, while heating the long metal tube with electricity,
Continuous passage of the electroless plating solution into the long metal tube was taken as a means for solving the above problems. Further, the long metal tube is electrically heated and preheated to a plating temperature or higher. While the long metal tube is electrically heated, an electroless plating solution previously heated to a plating temperature or higher is continuously supplied to the long metal tube. It is also possible to pass the liquid.
【０００６】[0006]
【発明の実施の形態】本発明の長尺金属管内面めっき方
法の一例について以下に説明する。まず、図１に示した
ように、その内面に対して予めアルカリ脱脂処理や活性
化処理などの前処理を施した長尺金属管２の端部４、４
に、電源６から引き出された電源線５、５を接続する。
この電源６から所定の電流を流して前記端部４、４を通
電電極として通電加熱し、この長尺金属管２の予備加熱
を行い、この長尺金属管２全体の温度を所定のめっき温
度よりも０〜２０℃程度高くする。前記長尺金属管２
を、引き続き上述のようにして通電加熱しつつ、予め所
定のめっき温度よりも０〜２０℃程度高い温度に加熱し
た無電解めっき液をその一端から連続して通液し、この
長尺金属管２の温度を前記めっき温度に保ちながら、そ
の内面に金属被覆層を形成する。BEST MODE FOR CARRYING OUT THE INVENTION An example of the method for plating the inner surface of a long metal pipe of the present invention will be described below. First, as shown in FIG. 1, the end portions 4 and 4 of the long metal tube 2 whose inner surface has been pretreated with alkali degreasing treatment or activation treatment in advance.
The power supply lines 5 and 5 drawn from the power supply 6 are connected to.
A predetermined current is made to flow from this power source 6 to electrically heat the ends 4 and 4 as current-carrying electrodes to preheat the long metal tube 2, and the temperature of the whole long metal tube 2 is set to a predetermined plating temperature. 0 to 20 ° C higher than the above. The long metal tube 2
While continuing to electrically heat as described above, the electroless plating solution previously heated to a temperature higher by about 0 to 20 ° C. than a predetermined plating temperature is continuously passed from one end of the long metal tube. While maintaining the temperature of 2 at the plating temperature, a metal coating layer is formed on the inner surface thereof.
【０００７】このとき、前記前記電源６から流す電流は
直流であり、また、その電流値は、前記電源線５の途中
に設けられた電流計８に表示されるようになっている。
また、長尺金属管２外面の両端部など複数箇所に温度計
を設置しておき、この金属管の温度を測定できるように
しておいてもよい。また、図１においてはコイル状の長
尺金属管２を用いているが、図２に示したように直線状
の長尺金属管２を用いることもできる。At this time, the current supplied from the power source 6 is direct current, and the current value is displayed on the ammeter 8 provided in the middle of the power source line 5.
Further, thermometers may be installed at a plurality of locations such as both ends of the outer surface of the long metal tube 2 so that the temperature of the metal tube can be measured. Further, although the coiled elongated metal tube 2 is used in FIG. 1, a linear elongated metal tube 2 may be used as shown in FIG.
【０００８】上述の無電解めっき液を連続して通液する
方法としては、ポンプによって送り込む方法や、自然落
下による方法などを用いることができる。また、この無
電解めっき液を加熱する方法としては、この無電解めっ
き液が入れられた容器をヒータなどによって加熱するな
どの方法を用いればよい。As a method for continuously passing the above electroless plating solution, there can be used a method of feeding by a pump, a method of dropping by gravity or the like. As a method of heating the electroless plating solution, a method of heating a container containing the electroless plating solution with a heater or the like may be used.
【０００９】この長尺金属管内面めっき方法によって、
その内面に金属被覆層を形成するできる長尺金属管２
は、電気伝導度が良好で、通電加熱することができる金
属からなるものであれば特に限定することはないが、具
体的には銅管、銅合金管、鋼管などがあげられる。この
長尺金属管２のサイズは外径１２．７０〜２８．５８ｍ
ｍ、肉厚０．６４〜０．８９ｍｍ、長さ１〜５０ｍ程度
のものである。By this inner surface plating method for a long metal tube,
Long metal tube 2 capable of forming a metal coating layer on its inner surface
Is not particularly limited as long as it is made of a metal that has good electric conductivity and can be heated by conduction, and specific examples thereof include a copper pipe, a copper alloy pipe, and a steel pipe. The size of this long metal tube 2 is 12.70 to 28.58 m in outer diameter.
m, wall thickness 0.64 to 0.89 mm, and length 1 to 50 m.
【００１０】例えば長尺金属管２として銅管を用い、そ
のサイズが、外径１５．８８ｍｍ、肉厚０．７１ｍｍ、
長さ２５ｍである場合、上述の電源６から５００〜４０
００Ａの直流電流を流すことによってこの長尺金属管２
全体の温度を５０〜１５０℃にすることができる。For example, a copper pipe is used as the long metal pipe 2, and its size is 15.88 mm in outer diameter and 0.71 mm in wall thickness.
If the length is 25 m, it is 500-40 from the above-mentioned power source 6.
This long metal tube 2 by passing a direct current of 00A
The overall temperature can be 50-150 ° C.
【００１１】無電解めっき液は、一般に使用される無電
解めっき液（置換めっき液または化学還元めっき液）を
用いることができるが、５０〜９０℃の条件で１〜２０
μｍ／ｈｒの速度で金属被覆層が形成されるものが好ま
しく、この条件になるように、目的とする金属被覆層を
構成する金属を選択し、この無電解めっき液の濃度を調
整する。この方法によれば種々の金属被覆層を形成する
ことができ、例えばＮｉ、Ｎｉ−Ｐ合金、Ｓｎ、Ｃｏ、
Ｐｂ、Ａｇ、Ａｕなどからなるものをあげることができ
る。その膜厚は０．１〜２０μｍとすることができる。
上述の方法によって形成される金属被膜の膜厚は、用い
る無電解めっき液の濃度と、その通液時間によって適宜
に調節することができる。As the electroless plating solution, a generally used electroless plating solution (displacement plating solution or chemical reduction plating solution) can be used, but 1 to 20 under the condition of 50 to 90 ° C.
It is preferable that the metal coating layer is formed at a rate of μm / hr. Under these conditions, the metal forming the target metal coating layer is selected and the concentration of this electroless plating solution is adjusted. According to this method, various metal coating layers can be formed, for example, Ni, Ni-P alloy, Sn, Co,
Examples include Pb, Ag, Au, and the like. The film thickness can be 0.1 to 20 μm.
The thickness of the metal coating formed by the above method can be appropriately adjusted depending on the concentration of the electroless plating solution used and the passage time.
【００１２】上述の無電解めっき液として、例えば、長
尺金属管２内面にＮｉ−Ｐ合金からなる金属被覆層を形
成する場合には、表１のような組成物からなる化学還元
めっき液を用いることができ、市販品では、トップニコ
ロン Ｙ−４５（商品名、奥野製薬工業製）を好適に用
いることができる。この場合、その組成がＮｉ：９２〜
８９％、Ｐ：８〜１１％であるＮｉ−Ｐ合金からなる金
属被覆層を形成することができる。また、長尺金属管２
として銅管を用い、その内面にＳｎ金属被覆層を形成す
るのに用いる無電解めっき液としては、例えば、表２に
示すような組成物からなる置換めっき液を用いることが
できる。市販品ではサブスターＳＮ−５（商品名、奥野
製薬工業製）を好適に用いることができる。As the above-mentioned electroless plating solution, for example, when a metal coating layer made of a Ni-P alloy is formed on the inner surface of the long metal tube 2, a chemical reduction plating solution made of a composition shown in Table 1 is used. As a commercially available product, Top Nicolon Y-45 (trade name, manufactured by Okuno Chemical Industry Co., Ltd.) can be preferably used. In this case, the composition is Ni: 92-
It is possible to form a metal coating layer made of a Ni-P alloy having 89% and P: 8 to 11%. In addition, long metal tube 2
As the electroless plating solution used to form the Sn metal coating layer on the inner surface of the copper tube, for example, a displacement plating solution composed of the composition shown in Table 2 can be used. As a commercial product, Substar SN-5 (trade name, manufactured by Okuno Chemical Industry Co., Ltd.) can be preferably used.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【表２】 [Table 2]
【００１５】このように、長尺金属管２を通電加熱する
ので、大がかりな装置を必要とせず、この長尺金属管２
全体を均一に加熱することができる。また、この長尺金
属管２を通電加熱してめっき温度以上に予備加熱した後
に、引き続きこの長尺金属管２の通電加熱しながら、予
めめっき温度以上に加熱した無電解めっき液を連続的に
通液することにより、さらにめっき中の長尺金属管２全
体の温度を均一に保つことができ、この長尺金属管２内
面に効率よく、均一な金属被覆層を形成することができ
る。Since the long metal tube 2 is electrically heated as described above, a large-scale device is not required, and the long metal tube 2 is not required.
The whole can be heated uniformly. In addition, after the long metal tube 2 is electrically heated to be preheated to a plating temperature or higher, the electroless plating solution previously heated to a plating temperature or higher is continuously heated while electrically heating the long metal tube 2. By passing the liquid, the temperature of the entire long metal tube 2 during plating can be kept uniform, and a uniform metal coating layer can be efficiently formed on the inner surface of the long metal tube 2.
【００１６】[0016]
【実施例】以下、本発明を実施例を示して詳しく説明す
る。 （実施例１）長尺金属管２として、外径１５．８８ｍ
ｍ、肉厚０．７１ｍｍ、長さ２０ｍの銅管を用い、上述
の方法に従って、以下のような条件で、その内面に、Ｎ
ｉ−Ｐ合金（Ｎｉ：９２〜８９％、Ｐ：８〜１１％）か
らなる金属被覆層を形成した。無電解めっき液として
は、化学還元めっき液であるトップニコロン Ｙ−４５
（商品名、奥野製薬工業製）を用いた。このめっき温度
は９０℃であった。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. (Example 1) As the long metal tube 2, the outer diameter is 15.88 m.
m, a wall thickness of 0.71 mm, and a length of 20 m, using the above-mentioned method, under the following conditions, the inner surface thereof is
A metal coating layer made of an i-P alloy (Ni: 92 to 89%, P: 8 to 11%) was formed. As the electroless plating solution, Top Nicolon Y-45 which is a chemical reduction plating solution is used.
(Trade name, manufactured by Okuno Pharmaceutical Co., Ltd.) was used. The plating temperature was 90 ° C.
【００１７】（長尺金属管予備加熱）上述の銅管に２０
００Ａの直流電流を２分間かけ、この銅管全体の温度を
１１０℃とした。 （無電解めっき液の加熱）ヒータによって９０℃に加熱
しておいた。 （金属被覆層の形成）上述の鋼管全体の温度を、３００
０Ａの直流電流をかけて９０℃としながら、上述の無電
解めっき液を連続して、３０分間通液させた。(Preliminary heating of long metal tube) 20
A direct current of 00 A was applied for 2 minutes, and the temperature of the entire copper tube was set to 110 ° C. (Heating of electroless plating solution) It was heated to 90 ° C by a heater. (Formation of metal coating layer)
While applying a direct current of 0 A to 90 ° C., the above electroless plating solution was continuously passed for 30 minutes.
【００１８】（実施例２）長尺金属管として、外径２
２．２２ｍｍ、肉厚０．８１ｍｍ、長さ２０ｍの銅管を
用い、上述のような方法で、以下の条件に従って、その
内面にＳｎからなる金属被覆層を形成した。 無電解め
っき液として置換めっき液であるサブスターＳＮ−５
（商品名：奥野製薬工業製）を用いた。このときのめっ
き温度は６０℃であった。(Embodiment 2) A long metal tube having an outer diameter of 2
Using a copper tube of 2.22 mm, a wall thickness of 0.81 mm, and a length of 20 m, a metal coating layer made of Sn was formed on the inner surface of the copper tube by the method described above according to the following conditions. Substar SN-5 which is a displacement plating solution as an electroless plating solution
(Product name: Okuno Pharmaceutical Co., Ltd.) was used. The plating temperature at this time was 60 ° C.
【００１９】（長尺金属管予備加熱）上述の銅管に１５
００Ａの直流電流を１分間かけ、この銅管全体の温度を
７０℃とした。 （無電解めっき液の加熱）ヒータによって７０℃に加熱
しておいた。 （金属被覆層の形成）上述の銅管全体の温度を、２５０
０Ａの直流電流をかけることによって、６０℃としなが
ら、上述の無電解めっき液を連続して２０分間通液させ
た。(Preliminary heating of long metal tube) 15
A direct current of 00 A was applied for 1 minute to bring the temperature of the entire copper tube to 70 ° C. (Heating of electroless plating solution) It was heated to 70 ° C by a heater. (Formation of metal coating layer) The temperature of the entire copper tube is set to 250
The electroless plating solution was continuously passed for 20 minutes while applying a direct current of 0 A at 60 ° C.
【００２０】このようにして金属被膜層を形成した実施
例１の鋼管と実施例２の銅管の中央部分と、両端部、す
なわち、前記無電解めっき液の入り口部分と出口部分と
を、それぞれ１ｍずつ切り出して、これらの内面に形成
された金属被膜の厚さを測定した。結果を表１に示す。
いずれも、均一な膜厚の金属被覆層が形成されているこ
とがわかった。The central portion of the steel pipe of Example 1 and the copper pipe of Example 2 on which the metal coating layer was formed in this manner, and the both end portions, that is, the inlet portion and the outlet portion of the electroless plating solution, were respectively formed. Each 1 m was cut out and the thickness of the metal coating formed on these inner surfaces was measured. The results are shown in Table 1.
It was found that a metal coating layer having a uniform film thickness was formed in each case.
【００２１】[0021]
【表３】 [Table 3]
【００２２】[0022]
【発明の効果】以上説明したように、長尺金属管を通電
加熱するので、大がかりな装置を必要とせず、この長尺
金属管全体を均一に加熱することができる。また、この
長尺金属管を通電加熱してめっき温度以上に予備加熱し
た後に、この長尺金属管の通電加熱しつつ、予めめっき
温度以上に加熱しておいた無電解めっき液を連続的に通
液することにより、さらにこのめっき処理中の長尺金属
管全体の温度を均一に保つことができ、この長尺金属管
内面全体に効率よく、均一な金属被覆層を形成すること
ができる。As described above, since the long metal tube is electrically heated, it is possible to uniformly heat the whole long metal tube without requiring a large-scale device. Further, after the long metal tube is electrically heated and preheated to a plating temperature or higher, the electroless plating solution previously heated to a plating temperature or higher is continuously heated while electrically heating the long metal tube. By passing the liquid, the temperature of the entire long metal tube during the plating process can be further kept uniform, and a uniform metal coating layer can be efficiently formed on the entire inner surface of the long metal tube.
【図１】 コイル状の長尺金属管の通電加熱の概略を示
したものである。FIG. 1 shows an outline of electric heating of a coiled long metal tube.
【図２】 直線状の長尺金属管の通電加熱の概略を示し
たものである。FIG. 2 shows an outline of electric heating of a linear elongated metal tube.
２・・・長尺金属管、４・・・端部、５・・・電源線、
６・・・電源、８・・・電流計2 ... long metal tube, 4 ... end, 5 ... power line,
6 ... Power supply, 8 ... Ammeter
Claims (2)
っき液をこの長尺金属管内に連続的に通液することを特
徴とする長尺金属管内面めっき方法。1. A method for plating an inner surface of a long metal tube, wherein an electroless plating solution is continuously passed through the long metal tube while electrically heating the long metal tube.
以上に予備加熱し、この長尺金属管を通電加熱しつつ、
予めめっき温度以上に加熱した無電解めっき液をこの長
尺金属管内に連続的に通液することを特徴とする長尺金
属管内面めっき方法。2. A long metal tube is electrically heated to be preheated to a plating temperature or higher, and while the long metal tube is electrically heated,
A method for plating an inner surface of a long metal pipe, which comprises continuously passing an electroless plating solution which has been heated to a plating temperature or higher in advance into the long metal pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09155396A JP3180660B2 (en) | 1996-04-12 | 1996-04-12 | Long metal tube inner surface plating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09155396A JP3180660B2 (en) | 1996-04-12 | 1996-04-12 | Long metal tube inner surface plating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09279357A true JPH09279357A (en) | 1997-10-28 |
| JP3180660B2 JP3180660B2 (en) | 2001-06-25 |
Family
ID=14029701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09155396A Expired - Fee Related JP3180660B2 (en) | 1996-04-12 | 1996-04-12 | Long metal tube inner surface plating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3180660B2 (en) |
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