JP2002005384A - Joints for cable protection piping and joint corrosion prevention methods - Google Patents
Joints for cable protection piping and joint corrosion prevention methodsInfo
- Publication number
- JP2002005384A JP2002005384A JP2000188017A JP2000188017A JP2002005384A JP 2002005384 A JP2002005384 A JP 2002005384A JP 2000188017 A JP2000188017 A JP 2000188017A JP 2000188017 A JP2000188017 A JP 2000188017A JP 2002005384 A JP2002005384 A JP 2002005384A
- Authority
- JP
- Japan
- Prior art keywords
- joint
- cable protection
- steel material
- melting point
- polyethylene
- 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
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000005536 corrosion prevention Methods 0.000 title claims 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 239000010959 steel Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 19
- 230000008018 melting Effects 0.000 claims abstract description 18
- 239000000853 adhesive Substances 0.000 claims abstract description 14
- 230000001070 adhesive effect Effects 0.000 claims abstract description 14
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims abstract description 13
- 229910000165 zinc phosphate Inorganic materials 0.000 claims abstract description 13
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000007797 corrosion Effects 0.000 claims abstract description 8
- 238000005260 corrosion Methods 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 239000004698 Polyethylene Substances 0.000 claims description 29
- -1 polyethylene Polymers 0.000 claims description 29
- 229920000573 polyethylene Polymers 0.000 claims description 29
- 238000000576 coating method Methods 0.000 abstract description 23
- 239000011248 coating agent Substances 0.000 abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 150000003839 salts Chemical class 0.000 abstract description 10
- 229920013716 polyethylene resin Polymers 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 2
- 239000003973 paint Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 9
- 238000007654 immersion Methods 0.000 description 3
- 102220491117 Putative postmeiotic segregation increased 2-like protein 1_C23F_mutation Human genes 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007610 electrostatic coating method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
(57)【要約】
【課題】 塩水環境下での鋼材に達する施工
疵部の耐塗膜剥離性の優れたケーブル保護配管の継手及
び継手の防食方法を提供する。
【解決手段】 継手の鋼材表面を清浄処理した
後、りん酸亜鉛処理またはクロメート処理を施した後
に、融点１１０℃以下の接着性ポリエチレン樹脂を０．
３ｍｍ以上塗装したケーブル保護配管の継手の防食仕様
により、塩水環境下での鋼材に達する施工疵部の耐塗装
剥離性の優れたケーブル保護配管の継手を得ることがで
きる。
【効果】 本発明のケーブル保護配管の継手
の防食仕様は従来のそれよりも塩水環境下での施工疵部
からの耐塗膜剥離が優れるため、防食性を長期にわたり
保持することができる。
PROBLEM TO BE SOLVED: To provide a joint of a cable protection pipe excellent in peeling resistance of a coating flaw at a work flaw reaching a steel material in a salt water environment and a method of preventing corrosion of the joint. SOLUTION: After cleaning the surface of a steel material of a joint, a zinc phosphate treatment or a chromate treatment is performed, and then an adhesive polyethylene resin having a melting point of 110 ° C. or less is added.
According to the anticorrosion specification of the joint of the cable protection pipe coated with 3 mm or more, it is possible to obtain the joint of the cable protection pipe excellent in the paint peeling resistance at the flaw in the construction reaching the steel material in the salt water environment. The anticorrosion specification of the joint of the cable protection pipe of the present invention is more excellent in peeling of the coating film from the flaws in the salt water environment than in the conventional case, so that the anticorrosion property can be maintained for a long time.
Description
【０００１】[0001]
【発明の属する技術分野】本発明はケーブル保護配管の
継手及び継手防食方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint of a cable protection pipe and a method of preventing corrosion of the joint.
【０００２】[0002]
【従来の技術】鋼材はしばしば周囲の環境に対する防食
手段を講ずることなく、大気中や地中に暴露されると腐
食する。そのため、電気及び通信ケーブル等の配管連結
に使用される鋼製継手の防食仕様としては溶融亜鉛メッ
キ、粉体ポリエチレン塗装などがある。しかし、冬季に
融雪剤を散布するような塩害のある地域などでは溶融亜
鉛メッキ継手では不十分であり、粉体ポリエチレン塗装
された継手が多用されている。一般に、ポリエチレンは
その化学安定性のために、鋼材との接着性に乏しい。そ
のために、継手では接着性を付与した変性ポリエチレン
の粉体塗装がされている。地中や水中の湿潤・接水環境
では塗膜剥離する場合があるため、りん酸亜鉛処理やク
ロメート処理などの下地処理がされている。しかし、塩
水環境下では鋼材に達する施工疵部の耐塗膜剥離性につ
いては十分ではなかった。2. Description of the Related Art Steel materials often corrode when exposed to the air or the ground without taking measures to protect the surrounding environment. For this reason, corrosion-resistant specifications of steel joints used for pipe connection of electric and communication cables include hot-dip galvanizing and powdered polyethylene coating. However, hot-dip galvanized joints are not sufficient in areas with salt damage such as spraying a snow-melting agent in winter, and joints coated with powdered polyethylene are often used. In general, polyethylene has poor adhesion to steel due to its chemical stability. For this purpose, the joints are coated with powder of modified polyethylene having adhesiveness. Under the wet or wet environment in the ground or in water, the coating film may be peeled off. Therefore, a base treatment such as a zinc phosphate treatment or a chromate treatment is performed. However, in a salt water environment, the coating film peeling resistance of the flaws reaching the steel material was not sufficient.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上記のような
従来の問題を解決するものであり、塩水環境下での鋼材
に達する施工疵部の耐塗膜剥離性の優れたケーブル保護
配管の継手及び継手の防食方法を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is intended to provide a cable protection pipe which is excellent in peeling resistance of a coating flaw at a work flaw reaching a steel material in a salt water environment. An object of the present invention is to provide a joint and a method of preventing corrosion of the joint.
【０００４】[0004]
【課題を解決するための手段】本発明者は、上記課題の
耐剥離性について鋭意検討した。そして、融点１１０℃
以下の変性ポリエチレンを用いることで耐剥離性の優れ
たケーブル保護配管の継手の防食仕様を見出した。Means for Solving the Problems The present inventors diligently studied the peeling resistance of the above-mentioned problem. And a melting point of 110 ° C.
The use of the following modified polyethylene has led to the discovery of the anticorrosion specification of a joint for a cable protection pipe having excellent peel resistance.
【０００５】すなわち、本発明の要旨は、鋼材表面を清
浄処理した後、りん酸亜鉛あるいはクロメート処理を施
した表面に融点１１０℃以下の接着性ポリエチレンを膜
厚０．３ｍｍ以上被覆したことを特徴とするケーブル保
護配管の継手及び継手の防食方法である。[0005] That is, the gist of the present invention is characterized in that after a steel material surface is cleaned, a surface treated with zinc phosphate or chromate is coated with an adhesive polyethylene having a melting point of 110 ° C or less to a film thickness of 0.3 mm or more. And a method of preventing corrosion of the joint of the cable protection pipe.
【０００６】[0006]
【発明の実施の形態】本発明の防食仕様は、図１に示す
ように、継手の鋼材表面を清浄処理した後、りん酸亜鉛
処理またはクロメート処理を施した後に、融点１１０℃
以下の接着性ポリエチレン樹脂を０．３ｍｍ以上塗装し
た仕様である。BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, the anticorrosion specifications of the present invention are as follows. After the steel surface of the joint is cleaned, zinc phosphate treatment or chromate treatment is applied, and the melting point is 110 ° C.
It is a specification in which the following adhesive polyethylene resin is painted 0.3 mm or more.
【０００７】図１において、１は清浄処理を施した鋼
材、２はりん酸亜鉛処理皮膜あるいはクロメート処理皮
膜、３は接着性ポリエチレン層である。In FIG. 1, 1 is a steel material subjected to a cleaning treatment, 2 is a zinc phosphate treated film or a chromate treated film, and 3 is an adhesive polyethylene layer.
【０００８】また、図２に示すように、継手の鋼材表面
を清浄処理した後、りん酸亜鉛処理またはクロメート処
理を施した後に、融点１１０℃以下の接着性ポリエチレ
ン樹脂を０．１ｍｍ以上、その外側に融点１１０℃以下
のポリエチレン樹脂を連続塗装した仕様である。４は接
着性ポリエチレン層３の上層に施したポリエチレン層で
ある。Further, as shown in FIG. 2, after the surface of the steel material of the joint is subjected to cleaning treatment, zinc phosphate treatment or chromate treatment, an adhesive polyethylene resin having a melting point of 110 ° C. or lower is 0.1 mm or more. It is a specification in which a polyethylene resin having a melting point of 110 ° C. or less is continuously coated on the outside. Reference numeral 4 denotes a polyethylene layer provided on the adhesive polyethylene layer 3.
【０００９】本発明に用いられる接着性ポリエチレン樹
脂は、基本的に、鋼材、ブラストあるいは酸洗等による
清浄処理した鋼材あるいはりん酸亜鉛、クロメート処理
等を施した鋼材に接着し、融点１１０℃以下のものであ
れば良い。上塗りに使用するポリエチレンは先に塗装し
た変性ポリエチレンと接着し、融点１１０℃以下のもの
であれば良い。The adhesive polyethylene resin used in the present invention basically adheres to a steel material, a steel material which has been cleaned by blasting or pickling, or a steel material which has been subjected to zinc phosphate, chromate treatment, etc., and has a melting point of 110 ° C. or less. Anything is good. The polyethylene used for the overcoat may be any one as long as it has a melting point of 110 ° C. or less, which adheres to the modified polyethylene previously coated.
【００１０】ポリエチレン塗装方法は継手の形状が複雑
であることから、塗料の回り込みが良い流動浸漬法ある
いは静電塗装法などの粉体塗装が良い。In the polyethylene coating method, since the shape of the joint is complicated, a powder coating such as a fluid immersion method or an electrostatic coating method, in which the coating material is easily wrapped around, is preferred.
【００１１】また、塩水環境下での鋼材に達する施工疵
部からの塗膜剥離は下記の機構で発現すると推定され
る。[0011] Further, it is presumed that the peeling of the coating film from the construction flaw reaching the steel material in a salt water environment is caused by the following mechanism.
【００１２】（１）疵部から塩水が進入し、下地処理層
あるいは、下地処理層と塗膜との接着点が破壊されるた
め、塗膜の接着力が低下する。(1) Salt water enters from the flaws and breaks the undercoating layer or the adhesion point between the undercoating layer and the coating film, so that the adhesion of the coating film decreases.
【００１３】（２）一方、ポリエチレンの熱膨張は鉄鋼
のそれの数十倍であるため、融点以下の温度域では塗膜
に残留応力が働いている。(2) On the other hand, since the thermal expansion of polyethylene is several tens of times that of steel, residual stress acts on the coating film in the temperature range below the melting point.
【００１４】（３）塗膜の接着力が残留応力による塗膜
を剥離する力を下回ると、塗膜剥離が発現する。(3) When the adhesive strength of the coating film is lower than the peeling force of the coating film due to the residual stress, the coating film peels off.
【００１５】したがって、本発明によれば、残留応力を
小さくすることが耐塗膜剥離性に有効であることが判っ
た。低融点のポリエチレンほど固体化する温度が低いた
め、塗膜の残留応力が小さく、耐塗膜剥離性を発現す
る。Therefore, according to the present invention, it has been found that reducing the residual stress is effective for the coating film peeling resistance. The lower the melting point of polyethylene, the lower the solidification temperature, so the residual stress of the coating film is small, and the coating film exhibits peeling resistance.
【００１６】[0016]
【実施例】以下に、本発明の実施例を比較例と比較する
ことによって説明する。使用した粉体ポリエチレンの融
点を表１に、実施例と比較例を表２に示す。EXAMPLES Examples of the present invention will be described below by comparing them with comparative examples. Table 1 shows the melting point of the powdered polyethylene used, and Table 2 shows Examples and Comparative Examples.
【００１７】（１）粉体ポリエチレン被覆継手の製作 スチールブラストした鋼製継手をりん酸亜鉛処理液浸
漬、水洗、乾燥させた後、鋼材温度２６０℃に加熱して
から流動浸漬法による粉体ポリエチレン塗装を施した。
Ｎｏ．１，２，３は接着性ポリエチレン単層仕様であ
る。Ｎｏ．４，５は継手加熱後連続して２つの流動槽に
浸漬させることで２層仕様の試験片を製作した。いずれ
も、ポリエチレンの全膜厚は０．５ｍｍであった。(1) Manufacture of powdered polyethylene-coated joints Steel blasted steel joints were immersed in a zinc phosphate treatment solution, washed with water, dried, heated to a steel material temperature of 260 ° C., and then powdered polyethylene by a fluidized immersion method. Painted.
No. 1, 2, and 3 are adhesive polyethylene single layer specifications. No. Samples Nos. 4 and 5 were manufactured by immersing them in two fluidized tanks successively after heating the joints to prepare a two-layer test piece. In each case, the total thickness of the polyethylene was 0.5 mm.
【００１８】（２）塩水浸漬試験 試験方法は以下の通り。ＪＩＳ Ｋ ５４００に準拠
し、試験片の被覆層に長さ４ｃｍの鋼材に達する２本の
人工疵を交差角度３０℃になるように入れた。この試験
片を３％食塩水に浸漬させた状態で４０℃に保ち、３週
間浸漬させた。１週間毎に試験片を取り出し観察し、鋼
材に達する人工疵部からのポリエチレン塗膜剥離有無に
より評価した。(2) Salt water immersion test The test method is as follows. According to JIS K 5400, two artificial flaws reaching a steel material having a length of 4 cm were inserted into the coating layer of the test piece at an intersection angle of 30 ° C. The test piece was immersed in 3% saline, kept at 40 ° C., and immersed for 3 weeks. The test piece was taken out and observed every week, and evaluated by the presence or absence of peeling of the polyethylene coating from the artificial flaw reaching the steel material.
【００１９】（３）表２の結果から、融点１１０℃以下
のポリエチレン塗膜であれば、単層（Ｎｏ．１，Ｎｏ．
２）と２層（Ｎｏ．４）のいずれでも塗膜剥離無で良好
であることが分かる。(3) From the results shown in Table 2, if the polyethylene coating film has a melting point of 110 ° C. or less, a single layer (No.
It can be seen that in both 2) and the two layers (No. 4), no peeling of the coating film was satisfactory.
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【表２】 [Table 2]
【００２２】[0022]
【発明の効果】以上のとおり、本発明のケーブル保護配
管の継手の防食仕様は、従来のそれ(表２のＮｏ．５)よ
りも塩水環境下での施工疵部からの耐塗膜剥離が優れる
ため、防食性を長期にわたり保持することができる。As described above, the anticorrosion specification of the joint of the cable protection pipe according to the present invention is more resistant to peeling of the coating film from the flaws in the salt water environment than the conventional one (No. 5 in Table 2). Since it is excellent, the anticorrosion property can be maintained for a long time.
【図１】本発明の請求項１のケーブル保護配管の継手の
防食仕様の一部断面を示す図である。FIG. 1 is a diagram showing a partial cross section of a corrosion-resistant specification of a joint for a cable protection pipe according to claim 1 of the present invention.
【図２】本発明の請求項２のケーブル保護配管の継手の
防食仕様の一部断面を示す図である。FIG. 2 is a view showing a partial cross section of a corrosion-resistant specification of a joint for a cable protection pipe according to a second embodiment of the present invention.
１ 清浄処理を施した鋼材 ２ りん酸亜鉛処理皮膜あるいはクロメート処理皮膜 ３ 接着性ポリエチレン層 ４ ポリエチレン層 1 Cleaned steel material 2 Zinc phosphate treated film or chromate treated film 3 Adhesive polyethylene layer 4 Polyethylene layer
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２３Ｆ 15/00 Ｃ２３Ｆ 15/00 (72)発明者 近藤 哲己 東京都千代田区大手町２−６−３ 新日本 製鐵株式会社内 (72)発明者 末内 康博 君津市君津１番地 新日本製鐵株式会社君 津製鐵所内 (72)発明者 大畑 博義 大阪府河内長野市菊水町８−22 東尾メッ ク株式会社内 (72)発明者 高田 保 大阪府河内長野市菊水町８−22 東尾メッ ク株式会社内 Ｆターム(参考） 3H024 EA02 EA04 EC04 ED04 EE02 4D075 BB74X BB75X DA15 DA20 EB13 4K044 AA02 AB03 BA15 BA17 BB03 BC02 BC05 CA16 CA53 4K062 AA10 BA20 BC07 DA10 FA04 GA03 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI theme coat ゛ (Reference) C23F 15/00 C23F 15/00 (72) Inventor Tetsumi Kondo 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Corporation (72) Inventor Yasuhiro Sueuchi 1 Kimitsu, Kimitsu City Inside Nippon Steel Corporation Kimitsu Works (72) Inventor Hiroyoshi Ohata 8-22 Kikusuicho, Kawachinagano City, Osaka Pref. (72) Inventor Tamotsu Takada 8-22 Kikusui-cho, Kawachinagano-shi, Osaka F-term (reference) 3H024 EA02 EA04 EC04 ED04 EE02 4D075 BB74X BB75X DA15 DA20 EB13 4K044 AA02 AB03 BA15 BA17 BB03 BC02 BC05 CA16 CA53 4K062 AA10 BA20 BC07 DA10 FA04 GA03
Claims (4)
あるいはクロメート処理を施した表面に融点１１０℃以
下の接着性ポリエチレンを膜厚０．３ｍｍ以上被覆した
ことを特徴とするケーブル保護配管の継手。1. A cable protection pipe characterized in that a steel material surface is cleaned and coated with zinc phosphate or a chromate-treated surface with an adhesive polyethylene having a melting point of 110 ° C. or less and a film thickness of 0.3 mm or more. Fittings.
あるいはクロメート処理を施した表面に融点１１０℃以
下の接着性ポリエチレンと融点１１０℃以下のポリエチ
レンを積層させ合計膜厚０．３ｍｍ以上被覆したことを
特徴とするケーブル保護配管の継手。2. After cleaning the surface of a steel material, an adhesive polyethylene having a melting point of 110 ° C. or less and a polyethylene having a melting point of 110 ° C. or less are laminated on the zinc phosphate or chromate-treated surface to cover a total film thickness of 0.3 mm or more. A joint for cable protection piping characterized by the following.
あるいはクロメート処理を施した表面に融点１１０℃以
下の接着性ポリエチレンを膜厚０．３ｍｍ以上被覆する
ことを特徴とするケーブル保護配管の継手防食方法。3. A cable protection pipe according to claim 1, wherein the surface of the steel material is subjected to a cleaning treatment, and then a surface treated with zinc phosphate or chromate is coated with an adhesive polyethylene having a melting point of 110 ° C. or less to a thickness of 0.3 mm or more. Joint corrosion prevention method.
あるいはクロメート処理を施した表面に融点１１０℃以
下の接着性ポリエチレンと融点１１０℃以下のポリエチ
レンを積層させ合計膜厚０．３ｍｍ以上被覆することを
特徴とするケーブル保護配管の継手防食方法。4. After cleaning the surface of a steel material, an adhesive polyethylene having a melting point of 110 ° C. or less and a polyethylene having a melting point of 110 ° C. or less are laminated on the zinc phosphate or chromate-treated surface to cover a total film thickness of 0.3 mm or more. A method for preventing corrosion of joints for cable protection piping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000188017A JP2002005384A (en) | 2000-06-22 | 2000-06-22 | Joints for cable protection piping and joint corrosion prevention methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000188017A JP2002005384A (en) | 2000-06-22 | 2000-06-22 | Joints for cable protection piping and joint corrosion prevention methods |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002005384A true JP2002005384A (en) | 2002-01-09 |
Family
ID=18687874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000188017A Pending JP2002005384A (en) | 2000-06-22 | 2000-06-22 | Joints for cable protection piping and joint corrosion prevention methods |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002005384A (en) |
-
2000
- 2000-06-22 JP JP2000188017A patent/JP2002005384A/en active Pending
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