JPS63312961A - Formation of corrosion protective film for cast-iron pipe - Google Patents
Formation of corrosion protective film for cast-iron pipeInfo
- Publication number
- JPS63312961A JPS63312961A JP14980887A JP14980887A JPS63312961A JP S63312961 A JPS63312961 A JP S63312961A JP 14980887 A JP14980887 A JP 14980887A JP 14980887 A JP14980887 A JP 14980887A JP S63312961 A JPS63312961 A JP S63312961A
- Authority
- JP
- Japan
- Prior art keywords
- iron pipe
- cast
- pipe
- cast iron
- 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.)
- Pending
Links
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 45
- 230000001681 protective effect Effects 0.000 title claims abstract description 11
- 238000005260 corrosion Methods 0.000 title claims abstract description 10
- 230000007797 corrosion Effects 0.000 title claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 title 1
- 238000005507 spraying Methods 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 14
- 239000011253 protective coating Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000000576 coating method Methods 0.000 abstract description 25
- 239000011248 coating agent Substances 0.000 abstract description 23
- 238000000137 annealing Methods 0.000 abstract description 12
- 238000007751 thermal spraying Methods 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 5
- 239000003973 paint Substances 0.000 abstract description 5
- 239000007921 spray Substances 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000007664 blowing Methods 0.000 abstract description 3
- 238000005266 casting Methods 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 230000000717 retained effect Effects 0.000 abstract 1
- 229910052725 zinc Inorganic materials 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000004381 surface treatment Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/14—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying for coating elongate material
- C23C4/16—Wires; Tubes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明はＨ鉄管の防食被膜の形成方法に関する。[Detailed description of the invention] Industrial applications The present invention relates to a method for forming an anticorrosive coating on H-iron pipes.
従来の技術
一般に、鋳鉄管の防食被膜は、耐食性を有するＺｎ 、
Ａｌあるいはｚｎ−Ａｌ疑似合金の被膜を、金属溶射す
ることにより溶射被膜として形成し、この溶射被膜をさ
らに塗料、被覆材、ライニング材等によって塗８２装し
て形成され、外的腐食作用から鋳鉄管を防食するととも
に、輸送時の損傷を防止するものである。そして、従来
このような防食被膜を形成する場合には、鋳鉄管を常温
に保った状態か、もしくは鋳鉄管を直前に予熱して金属
溶射および保護材の吹付けを行なってい友。BACKGROUND OF THE INVENTION In general, anticorrosion coatings for cast iron pipes are made of Zn, which has corrosion resistance.
A coating of Al or Zn-Al pseudo-alloy is formed as a thermal spray coating by metal spraying, and this thermal spray coating is further coated with paint, coating material, lining material, etc., and cast iron is protected from external corrosion. This protects the pipe from corrosion and prevents damage during transportation. Conventionally, when forming such an anticorrosion coating, the cast iron pipe is kept at room temperature, or the cast iron pipe is preheated immediately before metal spraying and spraying of the protective material are carried out.
発明が解決しようとする問題点
しかし、鋳鉄管を常温に保った状態で金属溶射を行うと
、溶射被膜の付着力が弱く、付着効率が低いものとなる
問題があり、また、直前に加熱して昇温し、熱間で行な
うには、加熱するための設備を必要とし、ガス加熱、電
気加熱、温水加熱いずれの方法を採っても、大規模な設
備と広いヌペースを必要とし、フンユングコストが高く
なる問題があった。Problems to be Solved by the Invention However, if metal spraying is performed while the cast iron pipe is kept at room temperature, there is a problem in that the adhesion of the sprayed coating is weak and the adhesion efficiency is low. Heating equipment is required to raise the temperature and perform hot heating, and regardless of whether gas heating, electric heating, or hot water heating is used, large-scale equipment and a wide space are required, making it difficult to carry out heating. There was a problem of high costs.
本発明は上記問題点を解決するものであり、鋳鉄管の製
造工程に着目し、前工程で付加された熱エネルギを有効
に活用することによって、強固な防食被膜を安価にして
経済的に形成する鋳鉄管の防食被膜の形成方法ｔ”提供
することを目的とする。The present invention solves the above problems, and focuses on the manufacturing process of cast iron pipes, and by effectively utilizing the thermal energy added in the previous process, it is possible to economically form a strong anti-corrosion coating at a low cost. The purpose of the present invention is to provide a method for forming an anticorrosion coating on cast iron pipes.
問題点を解決するための手段
上記問題点を解決するため、本発明は製造工程中におい
て高温の炉内で焼鈍される鋳鉄管を、前記炉°より出炉
後冷却して所定温度に調温し、調温された＃鉄管に耐腐
食性を有する金属を溶射して溶射被膜を形成し、さらに
鋳鉄管が所定温度を有する間に溶肘被膜上に防護材全吹
付けて塗覆装する構成としたものである。Means for Solving the Problems In order to solve the above problems, the present invention provides a method in which a cast iron pipe that is annealed in a high-temperature furnace during the manufacturing process is cooled to a predetermined temperature after being taken out of the furnace. A structure in which a corrosion-resistant metal is thermally sprayed onto a temperature-controlled #iron pipe to form a thermal spray coating, and the protective material is completely sprayed onto the molten elbow coating while the cast iron pipe has a predetermined temperature. That is.
作 用
上記構成において、鋳鉄管が炉内の焼鈍工程で与えられ
る熱エネルギを、出立後に放牧してしまうことなく適宜
調節して、鋳鉄管を所定温度に調温し、この状態におい
て金属溶射および保護材の吹付けを行なうので、別途に
、鋳鉄管を加熱する九めの手段およびエネルギを不要な
ものとなる。Effect In the above configuration, the thermal energy given to the cast iron pipe during the annealing process in the furnace is adjusted appropriately without causing the cast iron pipe to graze after leaving the furnace, and the temperature of the cast iron pipe is adjusted to a predetermined temperature, and in this state, metal spraying is performed. Since the protective material is also sprayed, additional means and energy for heating the cast iron pipe are no longer necessary.
実施例
以下、本発明の一実施例を図面に基づいて説明する。ま
ず、鋳鉄管ｌの鋳造工程（図示せず）に続く次工程とし
て高温の炉２による焼鈍工程Ａが配置されている。そし
て、焼鈍工程Ａに続く次工程として、ブラスト処理、清
掃等を行なうとともにエアーブロー、空回転あるいは水
冷等によって鋳鉄ＩＦＩの温度調節を行なう下地処理工
程Ｂが配置されている。そして、次工程には、回転する
ローラ３上に鋳鉄管１を載置して溶射ガン４からＺｎ−
Ａ１等の金属溶射を行なって鋳鉄管１に溶射被膜５を形
成する金属溶射工程Ｃが配置されている。EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. First, an annealing process A using a high-temperature furnace 2 is arranged as the next process following the casting process (not shown) of the cast iron pipe I. As the next step following the annealing step A, a surface treatment step B is arranged in which blasting, cleaning, etc. are performed, and the temperature of the cast iron IFI is adjusted by air blowing, idle rotation, water cooling, etc. In the next step, the cast iron pipe 1 is placed on the rotating roller 3 and the Zn-
A metal spraying process C is arranged to form a sprayed coating 5 on the cast iron pipe 1 by performing metal spraying such as A1.
そして、次工程には、鋳鉄管１に対して噴射ノズ／Ｌ／
６よジ塗料あるいは被覆材等の保護材の噴射を行なって
溶射被膜５上に保護被膜７を塗覆装する塗覆工程りが配
置されている。Then, in the next step, the injection nozzle /L/
6. A coating step is arranged to apply a protective coating 7 on the thermally sprayed coating 5 by spraying a protective material such as a twisting paint or a coating material.
以下、上記構成における作用について説明する。Hereinafter, the effects of the above configuration will be explained.
まず、溶湯を鋳型に鋳込んで形成された鋳鉄管１の素管
が、鋳造工程から焼鈍工程Ａに送られる。First, a raw pipe of cast iron pipe 1 formed by pouring molten metal into a mold is sent to an annealing process A from a casting process.
そして、焼鈍工程Ａにおいて、鋳鉄管１は高温の炉２内
で焼鈍される。この焼鈍工程で加熱された＃Ｐ鉄管１は
、焼鈍が終って炉２から出炉される段階では７００℃程
度あり、最低でも６５０℃の出炉が可能である。そして
、焼鈍工程で７００℃程度となっている鋳鉄管１ｔ−下
地処理工程Ｂにおいてエアーブロー、空回転あるいは水
冷等によって、更にはその間にグツスト処理、清掃等の
下地処理を行って・最終的に１５０〜３００℃に調温す
る。ここで、調温する温度が１５０〜３００℃であるの
は、下記に述べる理由による。すなわち、一般にＺｎ
、Ａ／金属溶射では、被溶射体の温度が１００℃以上で
溶射金属の融点の１／２以下の温度であれば、溶射被膜
の付着力は強再
いものであり、き裂やはく離が起らず、更には溶＾
滴（液状溶射粒子）が被溶射体に衝突付着した時に急冷
却されず、しばらく軟化状態が保たれる為で、粒子の飛
散が防止され、付着効率も向上する。Then, in an annealing step A, the cast iron pipe 1 is annealed in a high temperature furnace 2. The #P iron pipe 1 heated in this annealing step has a temperature of about 700° C. when it is taken out of the furnace 2 after the annealing, and it is possible to take it out at a temperature of at least 650° C. Then, in the annealing process, the temperature of 1 ton of cast iron pipe is about 700℃, and in the surface treatment step B, air blowing, idle rotation, water cooling, etc. are performed, and in the meantime, surface treatment such as rough treatment and cleaning is performed. Adjust the temperature to 150-300°C. Here, the reason why the temperature is controlled to be 150 to 300°C is as follows. That is, generally Zn
, A/In metal thermal spraying, if the temperature of the object to be sprayed is 100°C or higher and less than 1/2 of the melting point of the sprayed metal, the adhesion of the sprayed coating is strong and will cause cracking or peeling. Furthermore, when the melt droplets (liquid thermal spray particles) collide and adhere to the object to be thermally sprayed, they are not rapidly cooled down and remain in a softened state for a while, preventing the particles from scattering and improving the adhesion efficiency.
そして、被溶射体が鋳鉄管の場合、好ましい温度は１５
０〜３００℃であるために、下地処理工程Ｂにおいて鋳
鉄ｐｆ１１ ’ｉ １５０〜３００℃に調温する。そし
て、この調温された鋳鉄管ｌに対して、金属溶射工程Ｃ
でＺｎ−Ａ１等の金属溶射を溶射ガンによって行い、鋳
鉄管１に溶射被膜５１に１被膜と鋳鉄管１との膨張収縮
のアンバランスによる被膜のひびわれ、はく離等を防止
して強固に形成する。すなわち、第１表および第２表に
示すように付着力、付着効率ともに常湿溶射に較べて向
上し友ものとなる。When the object to be thermally sprayed is a cast iron pipe, the preferable temperature is 15
Since the temperature is 0 to 300°C, the temperature of the cast iron pf11'i is adjusted to 150 to 300°C in the base treatment step B. Then, a metal spraying process C is applied to the temperature-controlled cast iron pipe l.
A metal such as Zn-A1 is thermally sprayed using a thermal spray gun to form a strong coating on the cast iron pipe 1 by preventing cracking or peeling of the coating due to imbalance in expansion and contraction between the thermal spray coating 51 and the cast iron pipe 1. . That is, as shown in Tables 1 and 2, both adhesion force and adhesion efficiency are improved compared to normal humidity thermal spraying.
第 １ 表
Ｚｎのアーク溶射結果
第 ２ 表
ＡＩのアーク溶射結果
そして、金属溶射が終了した鋳鉄管ｌに対して、塗覆工
程りで塗料、被覆材等の保護材を噴射ノズ／Ｌ／６で吹
付け、溶射被膜５上に保護被膜７を塗覆装する。この時
、鋳鉄管１が昇温しているので、被覆材の溶融、焼付が
良好なものとなるとともに乾燥のスピード化が図られる
。例えば、エマルジョン系塗料の場合、５０〜１００°
Ｃの温度を鋳鉄管１が持っていれば即乾的な塗装を行う
ことが出来る。1. Arc spraying results for Table Zn 2. Arc spraying results for Table AI Then, on the cast iron pipe l after metal spraying, protective materials such as paint and coating material are sprayed in the coating process using the nozzle /L/6 The protective coating 7 is coated on the thermal sprayed coating 5 by spraying. At this time, since the temperature of the cast iron pipe 1 is rising, the coating material is melted and baked well, and the drying speed is increased. For example, in the case of emulsion paint, 50 to 100°
If the cast iron pipe 1 has a temperature of C, instant dry coating can be performed.
そして、塗覆装された保護被膜７によって溶射被膜５の
保護並びに防食性能の付加を行う。したがって、本実施
例によれば、焼鈍工程より出炉されて６５０℃以上の高
い温度を有する鋳鉄管１ｔ−下地処理工程Ｂにおいて、
下地処理を行ないながら冷却して溶射金属に最も適した
温度に調節するものであることから鋳鉄管１を金属溶射
に適した温度とするための加熱設備および新たなエネル
ギを不要となし、容易に適切な被溶射条件をつくり出し
てランニングコストを低減出来るとともに、下地処理を
終えた鋳鉄管１を再度の加熱によって再び酸化物で覆っ
てしまう危険が排除される。The coated protective coating 7 protects the thermally sprayed coating 5 and adds anti-corrosion performance. Therefore, according to this embodiment, in the base treatment step B of 1 t of cast iron pipes which are taken out from the annealing step and have a high temperature of 650° C. or higher,
Since the temperature is adjusted to the most suitable temperature for thermal spraying by cooling while performing surface treatment, there is no need for heating equipment or new energy to bring the cast iron pipe 1 to a temperature suitable for metal thermal spraying, making it easy to use. Running costs can be reduced by creating appropriate conditions for thermal spraying, and the risk of covering the cast iron pipe 1 with oxides again due to reheating after surface treatment is eliminated.
発明の効果
以上述べたごとく本発明によれば、焼鈍工程で与えられ
る熱エネμギを放散してしまうことなく適宜に調節して
鋳鉄管を所定温度に保つ次状態で金属溶射、および塗覆
装を行なうので、鋳鉄管を加熱する九めの手段および新
たなエネルギを別途に設ける必要がなくなり、極めて経
済的に防食被膜を形成することが出来る。Effects of the Invention As described above, according to the present invention, the thermal energy μ given in the annealing process is appropriately adjusted without dissipating, and the cast iron pipe is maintained at a predetermined temperature. Since this method eliminates the need to separately provide a means for heating the cast iron pipe and additional energy, the anticorrosion coating can be formed extremely economically.
第１図は本発明の一実施例を示す全体構成図である。
１・・・鋳鉄管、２・・・炉、４・・・溶射ガン、５・
・・溶射被膜、６・・・噴射ノズル、７・・・保護被膜
。
代理人 森 本 義 弘第１
里Ｓ装工程
ｌ・−（帽辣鷺
２・−炉
４・・う２射０゛〉
５−−−ミ８１窄１Ｍ韻
６・・・蛎射ノスール
７−作：ＩＨ＊＊ｌｊFIG. 1 is an overall configuration diagram showing an embodiment of the present invention. 1... Cast iron pipe, 2... Furnace, 4... Thermal spray gun, 5...
... Thermal spray coating, 6... Spray nozzle, 7... Protective coating. Agent Yoshihiro Morimoto 1 Sato S installation process 1・-(Hatarasagi 2・-Kona 4・・U2shot 0゛〉〉 5---Mi81 narrowing 1M rhyme 6...Kagashi nosur 7- Written by: IH**lj
Claims (1)
を、前記炉より出炉後冷却して所定温度に調温し、調温
された鋳鉄管に耐腐食性を有する金属を溶射して溶射被
膜を形成し、さらに鋳鉄管が所定温度を有する間に溶射
被膜上に防護材を吹付けて塗覆装することを特徴とする
鋳鉄管の防食被膜の形成方法。1. Cast iron pipes that are annealed in a high-temperature furnace during the manufacturing process are cooled down to a predetermined temperature after being taken out of the furnace, and a corrosion-resistant metal is sprayed onto the temperature-controlled cast iron pipes. A method for forming a corrosion-protective coating on a cast iron pipe, which comprises forming a thermal spray coating and further spraying a protective material onto the thermal spray coating while the cast iron pipe has a predetermined temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14980887A JPS63312961A (en) | 1987-06-16 | 1987-06-16 | Formation of corrosion protective film for cast-iron pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14980887A JPS63312961A (en) | 1987-06-16 | 1987-06-16 | Formation of corrosion protective film for cast-iron pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63312961A true JPS63312961A (en) | 1988-12-21 |
Family
ID=15483162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14980887A Pending JPS63312961A (en) | 1987-06-16 | 1987-06-16 | Formation of corrosion protective film for cast-iron pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63312961A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06277611A (en) * | 1993-03-23 | 1994-10-04 | Ngk Insulators Ltd | Apparatus for forming coating of ceramic long body |
| JP2020066773A (en) * | 2018-10-24 | 2020-04-30 | 株式会社クボタ | Film formation device and film formation method |
| JP2020152991A (en) * | 2019-03-22 | 2020-09-24 | 株式会社栗本鐵工所 | Method for manufacturing cast iron pipe and method for corrosively protecting surface of cast iron pipe |
| JP2020151702A (en) * | 2019-03-14 | 2020-09-24 | 株式会社栗本鐵工所 | Method for manufacturing metal pipe |
| JP2020152990A (en) * | 2019-03-22 | 2020-09-24 | 株式会社栗本鐵工所 | Cast iron pipe and method for manufacturing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5670885A (en) * | 1979-11-14 | 1981-06-13 | Kubota Ltd | Coating method of metal pipe |
-
1987
- 1987-06-16 JP JP14980887A patent/JPS63312961A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5670885A (en) * | 1979-11-14 | 1981-06-13 | Kubota Ltd | Coating method of metal pipe |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06277611A (en) * | 1993-03-23 | 1994-10-04 | Ngk Insulators Ltd | Apparatus for forming coating of ceramic long body |
| JP2020066773A (en) * | 2018-10-24 | 2020-04-30 | 株式会社クボタ | Film formation device and film formation method |
| JP2020151702A (en) * | 2019-03-14 | 2020-09-24 | 株式会社栗本鐵工所 | Method for manufacturing metal pipe |
| JP2020152991A (en) * | 2019-03-22 | 2020-09-24 | 株式会社栗本鐵工所 | Method for manufacturing cast iron pipe and method for corrosively protecting surface of cast iron pipe |
| JP2020152990A (en) * | 2019-03-22 | 2020-09-24 | 株式会社栗本鐵工所 | Cast iron pipe and method for manufacturing the same |
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