JPH03114823A - Colored, polyethylene-coated and highly corrosionproof steel material - Google Patents
Colored, polyethylene-coated and highly corrosionproof steel materialInfo
- Publication number
- JPH03114823A JPH03114823A JP25223989A JP25223989A JPH03114823A JP H03114823 A JPH03114823 A JP H03114823A JP 25223989 A JP25223989 A JP 25223989A JP 25223989 A JP25223989 A JP 25223989A JP H03114823 A JPH03114823 A JP H03114823A
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene
- layer
- coated
- colored
- corrosion
- 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
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 52
- -1 polyethylene Polymers 0.000 title claims abstract description 52
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 52
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 27
- 239000010959 steel Substances 0.000 title claims abstract description 27
- 239000000463 material Substances 0.000 title claims abstract description 24
- 238000005260 corrosion Methods 0.000 claims abstract description 30
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 239000000049 pigment Substances 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims abstract description 6
- 229920005989 resin Polymers 0.000 claims abstract description 6
- 238000010030 laminating Methods 0.000 claims abstract description 5
- 239000000853 adhesive Substances 0.000 claims description 12
- 230000001070 adhesive effect Effects 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 7
- 239000004593 Epoxy Substances 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 abstract description 16
- 238000004040 coloring Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- 239000012254 powdered material Substances 0.000 abstract 2
- 230000001464 adherent effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 36
- 239000011247 coating layer Substances 0.000 description 5
- 238000005422 blasting Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は海洋、港湾、河川等の腐食の激しい環境下で使
用される重防食鋼材、例えば、重防食鋼管杭、鋼管矢板
、鋼矢板等に関するものである。Detailed Description of the Invention (Industrial Application Field) The present invention relates to heavy corrosion-resistant steel materials used in environments with severe corrosion such as oceans, ports, and rivers, such as heavy-duty corrosion-resistant steel pipe piles, steel pipe sheet piles, steel sheet piles, etc. It is related to.
（従来の技術）
近年、海洋、港湾、河川等の腐食環境下で使用される鋼
材については工場仕上げによる重防食仕様が定着してき
ており、特にポリエチレンあるいはポリウレタンによる
重防食層が一般的である（例えば、特公昭６３−５７２
３４号公報、特開昭５１−４７０６３号公報）。(Prior art) In recent years, heavy corrosion protection specifications based on factory finishing have become established for steel materials used in corrosive environments such as oceans, ports, and rivers, and heavy corrosion protection layers made of polyethylene or polyurethane are particularly common ( For example, Tokuko Sho 63-572
34, JP-A-51-47063).
ところで、最近、構造物と周囲の環境との景観上の調和
を図るため、これらの重防食層に着色を施す試みが行な
われるようになり、ポリウレタン被覆重防食層に関して
は既にその着色技術が開発されている（例えば、特開昭
６０−２３５５号公報）。By the way, recently, attempts have been made to color these heavy corrosion protection layers in order to harmonize the landscape between the structure and the surrounding environment, and coloring technology has already been developed for polyurethane coated heavy corrosion protection layers. (For example, Japanese Patent Application Laid-Open No. 60-2355).
（発明が解決しようとする課題）
しかるに、ポリエチレンはその材料特性が不活性である
ため、一般の耐候性塗料、例えばアクリルウレタン系あ
るいはアクリルシリコン系塗料をその表面に塗布しても
密着性が悪く、またポリエチレン防食層は紫外線による
劣化を防ぐべく、般にはカーボンブラックを添加して黒
色としており、そのため防食層自体の着色化が困難であ
ることから、ポリエチレン被ｒｉ、重防食層に関しては
その着色技術の開発が未だなされていない。(Problem to be Solved by the Invention) However, since polyethylene is an inert material, even if a general weather-resistant paint, such as an acrylic urethane or acrylic silicone paint, is applied to its surface, it has poor adhesion. In addition, in order to prevent deterioration due to ultraviolet rays, polyethylene anti-corrosion layers are generally made black by adding carbon black, which makes it difficult to color the anti-corrosion layer itself. Coloring technology has not yet been developed.
したがって、本発明の目的とするところは着色を施した
ポリエチレン被覆重防食鋼材を提供するにある。Accordingly, an object of the present invention is to provide a colored polyethylene-coated heavy duty corrosion-resistant steel material.
（課題を解決するための手段）
本発明の着色ポリエチレン被覆重防食鋼材の特徴は粉体
塗装で形成したポリエチレン被覆重防食層に着色顔料を
含有した高耐候性樹脂層を粉体塗装で積層してなるとこ
ろにある。(Means for Solving the Problems) The colored polyethylene-coated heavy corrosion-resistant steel material of the present invention is characterized by laminating a highly weather-resistant resin layer containing a colored pigment on a polyethylene-coated heavy corrosion-resistant layer formed by powder coating. There is a place where it becomes.
（作 用）
鋼材はポリエチレン被Ｆｉ１７ｍ防食層により耐腐食性
とされ、その上、前記重防食層には高耐候性の着色被覆
層が密着して施され、周囲の環境との景観上の調和が図
られるとともに、より一層の耐腐食性が得られる。(Function) The steel material is made corrosion resistant by a polyethylene Fi17m anti-corrosion layer, and in addition, a highly weather-resistant colored coating layer is applied closely to the heavy anti-corrosion layer, creating an aesthetic harmony with the surrounding environment. In addition to this, further corrosion resistance can be obtained.
（実施例）
本発明の実施例につき、第１図乃至第４図を参照して、
以下説明する。(Example) Regarding the example of the present invention, with reference to FIGS. 1 to 4,
This will be explained below.
第１図は本発明の一実施例を示す着色ポリエチレン被覆
重防食鋼管の一部を破断した断面を示す。FIG. 1 shows a partially cutaway cross-section of a colored polyethylene-coated heavy duty anti-corrosion steel pipe showing one embodiment of the present invention.
鋼管１の表面にエポキシ系プライマー層２、接着性ポリ
エチレンＮ３、ポリエチレン防食Ｎ４、着色被覆層５が
順次積層されている。そこで、各被ｆ３！ｉｉｌ、２．
３．４．５の積層工程につき、第３図を参照して説明す
る。An epoxy primer layer 2, an adhesive polyethylene N3, a polyethylene anticorrosion N4, and a colored coating layer 5 are sequentially laminated on the surface of the steel pipe 1. Therefore, each recipient f3! ii, 2.
The lamination process in 3.4.5 will be explained with reference to FIG.
鋼管１については、前処理としてショツトブラストまた
はサンドブラストを施し、表面の酸化膜や錆を落として
おく、ブラストによる表面仕上げの程度はスエーデン規
格ＳＩＳ″ｉ’Ｓａ ２．５以上にしておくのがよい。Regarding the steel pipe 1, perform shot blasting or sand blasting as a pretreatment to remove the oxide film and rust on the surface.The degree of surface finish by blasting should be at least 2.5 according to the Swedish standard SIS"i'Sa. .
なお、ブラスト後、防食耐久性クロメート処理やリン酸
被膜処理等の化成処理を施してもよい。In addition, after blasting, chemical conversion treatment such as anti-corrosion durability chromate treatment or phosphoric acid coating treatment may be performed.
鋼管１は回転させながら、管軸方向に送られるが、送り
に際して、まず加熱装置１１によって鋼管１の被覆部分
を予熱する。鋼管１の予熱温度はその表面で２００〜２
９０°Ｃとする。The steel pipe 1 is fed in the axial direction while being rotated, and before feeding, the coated portion of the steel pipe 1 is first preheated by the heating device 11. The preheating temperature of the steel pipe 1 is 200~2 on its surface.
The temperature shall be 90°C.
鋼管１の予熱後、その表面にノズル１３Ａよりプライマ
ー形成用のエポキシ系合成樹脂粉体１２を散布し、鋼管
１の保有熱によって熔融、融着させて層厚２００μｍ以
下のプライマー層２を形成する。After preheating the steel pipe 1, epoxy synthetic resin powder 12 for forming a primer is sprayed on its surface from a nozzle 13A, and is melted and fused by the heat retained in the steel pipe 1 to form a primer layer 2 with a layer thickness of 200 μm or less. .
散布手段は静電粉体塗装が好適である。Electrostatic powder coating is suitable for the dispersion means.
次に、エポキシ系プライマー層２が溶融状態で被覆され
た鋼管１に、ノズル１３Ｂより接着性ポリエチレン粉体
（平均粒径１００〜１５０μｍ）を散布し、鋼管ｌの保
有熱によって、熔融、融着させて１００〜５００μ−程
度の接着性ポリエチレン層３を形成する。接着性ポリエ
チレンとしては、例えば、カルボキシル基酸無水物で変
性したもので、官能基はポリエチレン１分子当たり１個
が最適である。Next, adhesive polyethylene powder (average particle size 100 to 150 μm) is sprayed from the nozzle 13B onto the steel pipe 1 coated with the epoxy primer layer 2 in a molten state, and is melted and fused by the heat retained in the steel pipe 1. This forms an adhesive polyethylene layer 3 having a thickness of about 100 to 500 .mu.m. The adhesive polyethylene is, for example, one modified with a carboxyl acid anhydride, and optimally the number of functional groups is one per polyethylene molecule.
プライマー１’ｉｆ２のときと同様に散布手段は静電粉
体塗装が好適である。As in the case of primer 1'if2, electrostatic powder coating is suitable as the dispersing means.
次に、接着性ポリエチレン１Ｗｉ３が溶融状態で被覆さ
れた鋼管１に、ノズル１３Ｃよりポリエチレン粉体１５
を散布し、熔融、融着させて層厚２．５ ｎ＋ｍ以上の
ポリエチレン防食Ｎ４を形成する。散布手段は同様に静
電粉体塗装が好適である。Next, the polyethylene powder 15 is applied from the nozzle 13C to the steel pipe 1 coated with the adhesive polyethylene 1Wi3 in a molten state.
is sprayed, melted and fused to form a polyethylene corrosion protection N4 having a layer thickness of 2.5 n+m or more. Similarly, electrostatic powder coating is suitable as the dispersion means.
ポリエチレンは紫外線により劣化し、耐候性があるとは
いえないので、ポリエチレン粉体にＣ０Ｂ、３ｗｔ％以
下（２，５ｗｔ％が最３！りを添加し、混練してベレッ
ト化し、これを冷凍粉砕等の粉砕技術により２００〜４
００μｍの平均粒径とした粉体を用いる。Polyethylene is degraded by ultraviolet rays and cannot be said to be weather resistant, so polyethylene powder is added with C0B of 3wt% or less (2.5wt% or less is 3wt% or less), kneaded to form pellets, and then freeze-pulverized. 200~4 depending on the crushing technology such as
A powder having an average particle size of 0.00 μm is used.
最後に、ポリエチレン防食層４が溶融状態で被覆された
鋼管ｌに、着色顔料粉末を含有した高耐候性樹脂粉体１
６をノズル１３０より散布し、熔融させ、１００〜２５
０μｍ程度の厚さの着色被覆層５を形成する。散布手段
は同様に静電粉体塗装が好適である。図中、１７．１８
は後加熱装置、冷却装置をそれぞれ示す。Finally, a highly weather-resistant resin powder 1 containing colored pigment powder is applied to the steel pipe l coated with a polyethylene anti-corrosion layer 4 in a molten state.
6 is sprayed from the nozzle 130 and melted, 100 to 25
A colored coating layer 5 having a thickness of about 0 μm is formed. Similarly, electrostatic powder coating is suitable as the dispersion means. In the figure, 17.18
indicate a post-heating device and a cooling device, respectively.
なお、着色被覆材の物性に応じ、第２図に示すように第
１接着性ポリエチレン３の他にポリエチレン防食層４と
着色被覆層５との間に第２接着性ポリエチレン層６を介
在させてもよい。Depending on the physical properties of the colored coating material, in addition to the first adhesive polyethylene layer 3, a second adhesive polyethylene layer 6 may be interposed between the polyethylene anticorrosive layer 4 and the colored coating layer 5, as shown in FIG. Good too.
着色被覆材料としては、エポキシ樹脂、アクリル樹脂、
フッ化ビニリデン等を主原料とし、これに着色顔料を含
をせしめた粉体材料で、原料そのものが耐候性に優れた
材料が適当である。また着色被覆材料の融点はポリエチ
レン防食層４の余熱温度を考慮し、はぼ２００℃以下で
ある必要がある。Colored coating materials include epoxy resin, acrylic resin,
A suitable material is a powder material whose main raw material is vinylidene fluoride or the like and which is impregnated with a colored pigment, and the raw material itself has excellent weather resistance. Further, the melting point of the colored coating material needs to be approximately 200° C. or lower, taking into account the residual heat temperature of the polyethylene anticorrosive layer 4.
第４図に本発明の適用例を示す。コンクリート工Ｓの直
下部分Ｙの重防食層に着色被覆することにより、防食性
能を高めるとともに、構造物と周囲の環境との景観上の
調和を図ることができる。FIG. 4 shows an example of application of the present invention. By applying a colored coating to the heavy corrosion protection layer directly below the concrete work S, it is possible to improve the corrosion protection performance and achieve aesthetic harmony between the structure and the surrounding environment.
（発明の効果）
本発明は以上の説明より理解されるように、下記の諸効
果を奏する。(Effects of the Invention) As understood from the above description, the present invention provides the following effects.
（１）ポリエチレン防食層が熔融状態のうちに着色被覆
材料を散布するので、ポリエチレン防食層との十分な密
着が得られる。(1) Since the colored coating material is sprayed while the polyethylene anticorrosion layer is in a molten state, sufficient adhesion to the polyethylene anticorrosion layer can be obtained.
（２）ポリエチレン防食層の余熱温度を利用して着色層
を形成するので、プライマー層から着色層まで一貫して
同一ライン上で形成でき、製造コストを低減できる。(2) Since the colored layer is formed using the residual heat temperature of the polyethylene anticorrosive layer, it is possible to form everything from the primer layer to the colored layer on the same line, reducing manufacturing costs.
（３）従来のポリエチレン被覆重防食層の外側にさらに
高耐候性の着色被覆材料が被着されるので、防食性能は
一層向上する。(3) Since a highly weather-resistant colored coating material is further applied on the outside of the conventional polyethylene-coated heavy anticorrosion layer, the anticorrosion performance is further improved.
（４）鋼材の防食については防食層が分担するため、着
色層の厚さは２５０μ…以下で済むので、着色被覆材料
に多少高価な材料を使用しても、被覆層全体で見れば材
料コストを押さえることができる。(4) Since the corrosion protection layer takes care of the corrosion protection of steel materials, the thickness of the colored layer can be less than 250 μm, so even if a somewhat expensive material is used for the colored coating material, the material cost for the entire coating layer is reduced. can be held down.
図面は本発明の詳細な説明するためのもので、第１図は
着色ポリエチレン被ｒＪ、Ｍ防食鋼管の一部を破断した
断面図、第２図は第１図に示す着色ポリエチレン被ｒｉ
重防食鋼管の変形例の同様断面図、第３図は被覆工程の
説明図、第４図は海洋、港湾、河川等で使用される鋼管
杭の一部を着色ポリエチレン重防食層で被覆した通用例
を示す縦断面図である。
１−・・・−・・・・−鋼管、２・−−一−−−・−・
エポキシ系プライマー層、３・−・−−一−−・・−第
１接着性ポリエチレン層、４・・・−・−・ポリエチレ
ン防食層、２〜４・−・−・−・−ポリエチレン被覆重
防食層、５−・−一一一−−−着色高耐候性樹脂層、６
・・−・−・−・・・−第２接着性ポリエチレンＴＮ。The drawings are for explaining the present invention in detail, and FIG. 1 is a partially cutaway cross-sectional view of a colored polyethylene coated RJ, M corrosion-resistant steel pipe, and FIG.
A similar cross-sectional view of a modified example of heavy corrosion-resistant steel pipe, Figure 3 is an explanatory diagram of the coating process, and Figure 4 is a general-purpose steel pipe pile used in the ocean, ports, rivers, etc., partially covered with a colored polyethylene heavy corrosion-resistant layer. It is a longitudinal cross-sectional view showing an example. 1-...-- Steel pipe, 2---1---...
Epoxy primer layer, 3.--.--1--.-first adhesive polyethylene layer, 4.--.-- polyethylene anticorrosive layer, 2-4.--.-- polyethylene coating weight Anticorrosion layer, 5--111---Colored highly weather-resistant resin layer, 6
...------Second adhesive polyethylene TN.
Claims (3)
着色顔料粉体を含有した高耐候性樹脂層を粉体塗装で積
層してなることを特徴とする着色ポリエチレン被覆重防
食鋼材。(1) A colored polyethylene-coated heavy corrosion-resistant steel material, characterized in that it is made by laminating a highly weather-resistant resin layer containing colored pigment powder on a polyethylene-coated heavy-duty anti-corrosion layer formed by powder coating.
ライマー層に接着性ポリエチレン層とポリエチレン防食
層を順次積層して形成した請求項１記載の着色ポリエチ
レン被覆重防食鋼材。(2) The colored polyethylene-coated heavy-duty anti-corrosion steel material according to claim 1, wherein the polyethylene-coated heavy-duty anti-corrosion layer is formed by sequentially laminating an adhesive polyethylene layer and a polyethylene anti-corrosion layer on an epoxy primer layer.
ライマー層に第１接着性ポリエチレン層とポリエチレン
防食層と第２接着性ポリエチレン層を順次積層して形成
した請求項１記載の着色ポリエチレン被覆重防食鋼材。(3) The colored polyethylene-coated heavy-duty anti-corrosion layer according to claim 1, wherein the polyethylene-coated heavy-duty anti-corrosion layer is formed by sequentially laminating a first adhesive polyethylene layer, a polyethylene anti-corrosion layer and a second adhesive polyethylene layer on an epoxy primer layer. Steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25223989A JPH03114823A (en) | 1989-09-29 | 1989-09-29 | Colored, polyethylene-coated and highly corrosionproof steel material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25223989A JPH03114823A (en) | 1989-09-29 | 1989-09-29 | Colored, polyethylene-coated and highly corrosionproof steel material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03114823A true JPH03114823A (en) | 1991-05-16 |
Family
ID=17234449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25223989A Pending JPH03114823A (en) | 1989-09-29 | 1989-09-29 | Colored, polyethylene-coated and highly corrosionproof steel material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03114823A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0557839A (en) * | 1991-08-29 | 1993-03-09 | Nkk Corp | Cover metal member |
| US6010252A (en) * | 1998-08-21 | 2000-01-04 | Eastman Kodak Company | Shutter mechanism |
| JP4719022B2 (en) * | 2006-02-08 | 2011-07-06 | 日鐵住金建材株式会社 | Road guard fence connection structure and road guard beam material |
| JP2015534007A (en) * | 2012-08-06 | 2015-11-26 | サンーゴバン パム | Steel pipe member for buried pipe with outer coating |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61141972A (en) * | 1984-12-14 | 1986-06-28 | Kansai Paint Co Ltd | Method for corrosion-proof painting of steel plate |
-
1989
- 1989-09-29 JP JP25223989A patent/JPH03114823A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61141972A (en) * | 1984-12-14 | 1986-06-28 | Kansai Paint Co Ltd | Method for corrosion-proof painting of steel plate |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0557839A (en) * | 1991-08-29 | 1993-03-09 | Nkk Corp | Cover metal member |
| US6010252A (en) * | 1998-08-21 | 2000-01-04 | Eastman Kodak Company | Shutter mechanism |
| JP4719022B2 (en) * | 2006-02-08 | 2011-07-06 | 日鐵住金建材株式会社 | Road guard fence connection structure and road guard beam material |
| JP2015534007A (en) * | 2012-08-06 | 2015-11-26 | サンーゴバン パム | Steel pipe member for buried pipe with outer coating |
| US10876674B2 (en) | 2012-08-06 | 2020-12-29 | Saint-Gobain Pam | Iron-based piping element for buried pipeline, comprising an outer coating |
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