JP5653084B2 - Iron-based member subjected to surface treatment and surface treatment method of iron-based member - Google Patents
Iron-based member subjected to surface treatment and surface treatment method of iron-based member Download PDFInfo
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本発明は表面処理が施された鉄系部材および鉄系部材の表面処理方法に関する。 The present invention relates to an iron-based member subjected to surface treatment and a surface treatment method for the iron-based member.
上下水道管などとして地中に埋設される鋳鉄管は、地下水等による腐食を防止するため、一般に外面に防食被膜が形成される。この防食被膜としては、塗膜の他、金属等を溶射した溶射被膜が知られている（例えば、特許文献１等）。溶射被膜は、埋戻土砂などの衝撃や摩擦に耐える機械的耐久性が優れるため、そのような耐久性を要求される埋設鋳鉄管等の防食被膜として採用されている。 Cast iron pipes buried in the ground as water and sewage pipes or the like generally have a corrosion-resistant coating formed on the outer surface in order to prevent corrosion due to groundwater or the like. As this anti-corrosion coating, the thermal spray coating which sprayed the metal etc. other than the coating film is known (for example, patent document 1 etc.). Thermal sprayed coatings are used as anticorrosive coatings for buried cast iron pipes and the like that require such durability because they have excellent mechanical durability to withstand impacts and friction such as backfilled sand.
ところが、金属製の溶射被膜は、図２に示すように、溶射したままの状態では空隙や亀裂が多く存在し、そのままの状態で使用したのでは、空隙や亀裂に地下水が浸入することで防食性能が低下してしまう不具合を有する。溶射被膜は、鋳鉄管以外の材料に対しても形成されているが、これらの鋳鉄管以外の材料に形成される溶射被膜に対しては、溶射被膜形成後に、前記空隙や亀裂からなる孔を封じる封孔処理をすることがあり、この封孔処理を行うことによって、溶射被膜の物理的性質や、溶射被膜の防食性能等の化学的性質が向上する。したがって、このような封孔処理の技術を、鋳鉄管の溶射被膜にも適用することが適切である。 However, as shown in FIG. 2, the metal sprayed coating has a lot of voids and cracks as it is sprayed, and if it is used as it is, it prevents corrosion due to the penetration of groundwater into the voids and cracks. There is a problem that the performance is degraded. The thermal spray coating is also formed on materials other than cast iron pipes, but for thermal spray coatings formed on materials other than these cast iron pipes, holes formed by the voids and cracks are formed after the thermal spray coating is formed. Sealing treatment may be performed, and by performing this sealing treatment, the physical properties of the sprayed coating and the chemical properties such as the anticorrosion performance of the sprayed coating are improved. Therefore, it is appropriate to apply such sealing technology to a sprayed coating of a cast iron pipe.
封孔処理を行う方法としては、（ア）浸透性の良い溶液を塗布して、この溶液により孔（溶射被膜の空隙や亀裂）を埋める、（イ）溶射被膜を加熱することで溶融させて、孔をなくす、（ウ）薬品等を塗布して、薬品と溶射被膜とを反応させ、反応生成物により孔をふさぐ、などの方法がある。 As a method for performing the sealing treatment, (a) a solution having good permeability is applied, and the holes (voids and cracks of the sprayed coating) are filled with this solution, and (b) the sprayed coating is melted by heating. There are methods such as eliminating holes, (c) applying chemicals, reacting the chemicals with the sprayed coating, and closing the holes with reaction products.
これらの封孔処理方法の中でも、浸透性の良い溶液である封孔処理剤を塗布する封孔処理方法が多く採用されている。その場合に用いられる封孔処理剤としては、エポキシ樹脂（エポキシ系）等の有機系樹脂や、シリコン樹脂（シリケート系）等の無機系樹脂、あるいは有機系樹脂と無機系樹脂とが混合された複合系樹脂がある。 Among these sealing treatment methods, many sealing treatment methods in which a sealing agent that is a highly permeable solution is applied are employed. As the sealing agent used in that case, an organic resin such as an epoxy resin (epoxy type), an inorganic resin such as a silicon resin (silicate type), or an organic resin and an inorganic resin are mixed. There are composite resins.
溶射被膜が形成され、さらに封孔処理が施された鋳鉄管は、外観体裁を整えるなどの目的から、その後に、外面に塗料が上塗りされる場合が多い。 In many cases, a cast iron pipe on which a thermal spray coating is formed and further subjected to sealing treatment is subsequently coated with a paint on the outer surface for the purpose of adjusting the appearance.
浸透性の良い封孔処理剤には、溶剤系で有機系のものが多い。しかし、溶剤系のものは、乾燥性に優れているものの、環境負荷になり大気汚染にもつながる。また溶剤系のものは、引火しやすく危険物の対象となり、このため生産工場における鋳鉄管の製造ラインでは使用しないことが望ましい。 Many sealing agents with good permeability are solvent-based and organic-based. However, solvent-based ones are excellent in drying properties, but become an environmental burden and lead to air pollution. In addition, solvent-based materials are easily flammable and are subject to dangerous materials. For this reason, it is desirable not to use them in the production line of cast iron pipes in production plants.
有機系の封孔処理剤は、塗膜形成性に優れるものの、有機材料の分子が大きく、溶剤は空隙などへの浸透性が良好であるが、有機分子は浸透しにくいものである。しかも、有機系の封孔処理剤は、導電性に乏しいため、空隙や亀裂に入り込んだ場合は金属製の溶射被膜中に電気的な絶縁部分が形成されることになって、溶射被膜の防食性能を低下させやすいという懸念がある。 Although the organic sealing agent is excellent in coating film formability, the organic material has a large molecule and the solvent has good permeability to voids, but the organic molecule does not easily penetrate. Moreover, since the organic sealing agent is poor in conductivity, an electrical insulating part is formed in the metal sprayed coating when it enters a void or crack, thereby preventing corrosion of the sprayed coating. There is a concern that the performance is likely to deteriorate.
また、図３に示すように、鋳鉄管１の表面に形成される溶射被膜２としては亜鉛系のものが用いられることが多いが、この亜鉛系の溶射被膜２の表面に有機系の封孔処理剤３を塗布した場合は、図示のように溶射被膜２の表面に封孔処理剤３による塗膜が形成される。しかし、この塗膜は上述のように電気を通しにくい。すなわち、溶射被膜２の亜鉛が亜鉛イオン（Ｚｎ２+）となって溶出することで鋳鉄管１の防食に寄与するのであるが、塗膜が存在することで、溶射被膜２から亜鉛イオン（Ｚｎ２+）が溶出しにくい。つまり、溶射被膜２の表面が露出せず、その表面が電気を通しにくい膜で覆われることになる。 In addition, as shown in FIG. 3, a zinc-based spray coating 2 is often used as the spray coating 2 formed on the surface of the cast iron pipe 1, and an organic sealing hole is formed on the surface of the zinc-based spray coating 2. When the treatment agent 3 is applied, a coating film by the sealing treatment agent 3 is formed on the surface of the thermal spray coating 2 as illustrated. However, this coating is difficult to conduct electricity as described above. That is, the zinc in the thermal spray coating 2 is eluted as zinc ions (Zn 2+ ), which contributes to the corrosion protection of the cast iron pipe 1. However, the presence of the coating film causes the zinc ion (Zn) from the thermal spray coating 2. 2+ ) is difficult to elute. That is, the surface of the thermal spray coating 2 is not exposed and the surface is covered with a film that is difficult to conduct electricity.
したがって、図示のように溶射被膜２に鋳鉄管１の鉄地に至る傷４がついた場合には、溶射被膜２の全表面で傷４の部分を防食することができず、図３において細い矢印で示される電流が傷４の近傍にしか流れずに、溶射被膜２による犠牲陽極作用が小さくなる。 Therefore, as shown in the figure, when the thermal spray coating 2 has a scratch 4 that reaches the iron ground of the cast iron pipe 1, the entire surface of the thermal spray coating 2 cannot prevent the portion of the scratch 4 and is thin in FIG. The current indicated by the arrow flows only in the vicinity of the scratch 4 and the sacrificial anodic action by the thermal spray coating 2 is reduced.
さらに有機物は一般に耐熱性に劣ることから、封孔処理剤３の塗布後に加熱処理を施すことが必要な場合には、その加熱条件によっては有機物が燃焼してしまうことがある。
本発明は、鋳鉄管などの鉄系部材の表面に形成された金属溶射被膜に封孔処理を施すときに、従来に比べて鉄形部材の防食性をいっそう向上できるようにすることを目的とする。
Furthermore, since the organic matter is generally inferior in heat resistance, the organic matter may be burnt depending on the heating conditions when it is necessary to perform a heat treatment after the sealing agent 3 is applied.
An object of the present invention is to make it possible to further improve the anticorrosion property of an iron-shaped member as compared with the conventional case when performing a sealing treatment on a metal spray coating formed on the surface of an iron-based member such as a cast iron pipe. To do.
この目的を達成するため本第１発明は、鉄系部材の表面に金属溶射被膜が形成され、金属溶射被膜の表面に水性の封孔処理剤が塗布され、
封孔処理剤の表面に上塗りが施されている鉄系部材であって、
封孔処理剤は、無機系成分を５〜２０質量％含有するとともに、樹脂成分を１０〜３０質量％含有し、
無機系成分はコロイダルシリカを主成分とし、
樹脂成分はアクリルエマルジョン、シリコンエマルジョン、アクリルシリコンエマルジョンのいずれかを主成分とすることを特徴とする。
In order to achieve this object, the first invention is that a metal spray coating is formed on the surface of the iron-based member, and an aqueous sealing agent is applied to the surface of the metal spray coating .
An iron-based member that is overcoated on the surface of the sealing agent,
The sealing agent contains 5 to 20% by mass of an inorganic component and 10 to 30% by mass of a resin component,
The inorganic component is mainly composed of colloidal silica,
The resin component is mainly composed of any of an acrylic emulsion, a silicon emulsion, and an acrylic silicon emulsion .
本第２発明の表面処理が施された鉄系部材は、鉄系部材が鋳鉄管であることを特徴とする。 The iron-based member subjected to the surface treatment of the second invention is characterized in that the iron-based member is a cast iron pipe.
本第３発明は、コロイダルシリカを主成分とする無機系成分を５〜２０質量％含有するとともに、アクリルエマルジョン、シリコンエマルジョン、アクリルシリコンエマルジョンのいずれかを主成分とする樹脂成分を１０〜３０質量％含有する水性の封孔処理剤を用いた鉄系部材の表面処理方法であって、The third invention contains 5 to 20% by mass of an inorganic component mainly composed of colloidal silica and 10 to 30% by mass of a resin component mainly composed of any one of an acrylic emulsion, a silicon emulsion, and an acrylic silicon emulsion. %, A surface treatment method of an iron-based member using an aqueous sealing agent containing
鉄系部材の表面に金属溶射被膜を形成し、Form a metal spray coating on the surface of the iron-based member,
金属溶射被膜の表面に封孔処理剤を塗布し、Apply a sealing agent to the surface of the metal spray coating,
封孔処理剤の表面に上塗りを施すことを特徴とする。The surface of the sealing agent is overcoated.
したがって本発明によれば、水性の無機系封孔処理剤が用いられることで、従来の有機系の封孔処理剤が用いられる場合に比べて、金属溶射被膜の空隙や亀裂に浸透しやすく、浸透した場合は空隙や亀裂が電気を通しやすい無機質で封孔されるために溶射被膜の性能を強化することが可能であり、水性であるために環境負荷が小さく、また無機系の封孔処理剤は有機系の封孔処理剤に比べて電気を通しやすいために、傷がついた場合に金属溶射被膜が犠牲陽極作用を発揮しやすいという利点がある。しかも無機系であるために耐熱性に優れているという利点もある。したがって本発明によれば、結果的に、防食性の向上を図ることができる。 Therefore, according to the present invention, by using an aqueous inorganic sealing agent, compared to the case where a conventional organic sealing agent is used, the metal spray coating easily penetrates into voids and cracks, When infiltrated, voids and cracks are sealed with an inorganic material that is easy to conduct electricity, so the performance of the sprayed coating can be enhanced, and since it is water-based, the environmental impact is small, and inorganic sealing treatment Since the agent is easier to conduct electricity than the organic sealing agent, there is an advantage that the metal sprayed coating easily exhibits a sacrificial anodic action when scratched. Moreover, since it is inorganic, it has an advantage of excellent heat resistance. Therefore, according to the present invention, as a result, the corrosion resistance can be improved.
図１において、１は鉄系部材としての鋳鉄管であり、その外表面には亜鉛系の溶射被膜２が形成されている。この溶射被膜２には空隙６が存在する。溶射被膜２の表面には、水性の無機系封孔処理剤７が塗布されている。この封孔処理剤７は、図示のように、溶射被膜２の表面に塗膜を形成するとともに、空隙６に入り込んでその封孔処理を行う。 In FIG. 1, reference numeral 1 denotes a cast iron pipe as an iron-based member, and a zinc-based sprayed coating 2 is formed on the outer surface thereof. There are voids 6 in the sprayed coating 2. An aqueous inorganic sealing agent 7 is applied to the surface of the thermal spray coating 2. As shown in the figure, this sealing agent 7 forms a coating film on the surface of the sprayed coating 2 and enters the gap 6 to perform the sealing treatment.
封孔処理剤７による塗膜を形成するための材料の一例として、たとえば、水性媒体中に、無機分と、樹脂分と、添加剤とを分散させたものを挙げることができる。 As an example of the material for forming the coating film by the sealing agent 7, for example, an inorganic medium, a resin component, and an additive can be dispersed in an aqueous medium.
無機分としては、コロイダルシリカ、アルミナ、ジルコニアなどを例示することができる。なかでも、ナノオーダーサイズのシリカ粒子がコロイド状に分散しているコロイダルシリカが、水性であり、粘度が低く、シリカ粒子がナノオーダーサイズであるため溶射被膜に浸透しやすく、シリカ粒子が水溶液中で均一に分散しており、また市場において入手しやすいという点で好都合である。 Examples of inorganic components include colloidal silica, alumina, zirconia, and the like. Among them, colloidal silica in which nano-order size silica particles are colloidally dispersed is water-based, has a low viscosity, and the silica particles are nano-order size, so that they easily penetrate into the sprayed coating. It is advantageous in that it is uniformly dispersed and easily available in the market.
樹脂分は、塗膜形成材料として機能するものであり、かつ、それとともに、封孔処理剤７の表面に塗料などによる上塗りが施されるときには、その上塗り剤との密着性の向上に寄与する。具体的には、ウレタンエマルジョン、エポキシエマルジョン、アクリルエマルジョン、シリコンエマルジョン、アクリルシリコンエマルジョンなどを用いることができる。本発明者らが試験を行ったところ、なかでも、アクリルエマルジョン、シリコンエマルジョン、アクリルシリコンエマルジョンが同程度の良い結果を示した。 The resin component functions as a coating film forming material, and contributes to improving the adhesion with the top coating agent when the surface of the sealing agent 7 is overcoated with a paint or the like. . Specifically, urethane emulsion, epoxy emulsion, acrylic emulsion, silicon emulsion, acrylic silicon emulsion, and the like can be used. As a result of tests conducted by the present inventors, among them, acrylic emulsion, silicon emulsion, and acrylic silicon emulsion showed the same good results.
添加物は、各種のものを用いることができる。代表的な添加物として、分散剤や消泡剤などを例示することができる。 Various additives can be used. Examples of typical additives include dispersants and antifoaming agents.
水性媒体としては、水を挙げることができる。 An example of the aqueous medium is water.
なお、鉄系部材１は鋳鉄管のみに限定されず、本発明は、鋳鉄管以外の鉄系の管路構成機材（たとえば、バルブなど）や、鉄系の構造物などにも適用することができる。また溶射被膜２は、亜鉛系のみならず、亜鉛−錫−マグネシウム系、亜鉛−アルミ系などを用いることもできる。 Note that the iron-based member 1 is not limited to a cast iron pipe, and the present invention can be applied to iron-based conduit components other than cast iron pipes (for example, valves), iron-based structures, and the like. it can. The thermal spray coating 2 can be not only zinc-based but also zinc-tin-magnesium-based or zinc-aluminum-based.
各種の封孔処理剤を準備して、所要の性能について調査した。その調査対象とした性能は、次の通りであった。 Various sealing agents were prepared and required performance was investigated. The performance targeted for the investigation was as follows.
（１）粘性（浸透性）
イワタカップを用いて測定し、下記の基準で評価した。
(1) Viscosity (permeability)
It measured using the Iwata cup and evaluated on the following reference | standard.
◎：１０秒未満
○：１０秒以上かつ１５秒未満
△：１５秒以上かつ２０秒未満
×：２０秒以上
◎: Less than 10 seconds ○: More than 10 seconds and less than 15 seconds △: More than 15 seconds and less than 20 seconds ×: More than 20 seconds
（２）上塗り塗料との付着性
鉄系部材に１３０ｇ／ｍ２の亜鉛溶射を施し、さらに目標理論膜厚５μｍで封孔処理剤を散布して、試験片とした。この試験片を用いて、エポキシ樹脂塗料、アクリル樹脂塗料などの合成樹脂塗料との付着性について、碁盤目試験（ＪＩＳ Ｋ ５６００）を行い、下記の基準で評価した。なお、いずれの合成樹脂塗料を用いても、同様の結果が得られた。
(2) Adhesiveness with top coat paint A 130 g / m 2 zinc spray was applied to the iron-based member, and a sealing agent was sprayed at a target theoretical film thickness of 5 μm to obtain a test piece. Using this test piece, a cross-cut test (JIS K 5600) was performed on the adhesion with a synthetic resin paint such as an epoxy resin paint and an acrylic resin paint, and the following criteria were evaluated. Similar results were obtained with any synthetic resin paint.
◎：分類０
○：分類１
△：分類２
×：分類３以上
: Classification 0
○: Classification 1
Δ: Classification 2
×: Classification 3 or more
（３）耐熱性
上記（２）で用いたのと同じ試験片を３０分間加熱したときに、焦げ目が発生する上限の温度を調査し、下記の基準で評価した。
(3) Heat resistance When the same test piece used in the above (2) was heated for 30 minutes, the upper limit temperature at which a burnt occurred was investigated and evaluated according to the following criteria.
◎：３５０℃を超える範囲
○：３５０℃
△：３００℃
×：２５０℃
A: Range exceeding 350 ° C ○: 350 ° C
Δ: 300 ° C
×: 250 ° C
（４）防食性
１５０ｍｍ×９０ｍｍの鋼板に１３０ｇ／ｍ２の亜鉛溶射を施し、さらに目標理論膜厚５μｍで封孔処理剤を散布して、試験片とした。この試験片に、鉄地にいたるクロスカットを付け、ＪＡＳＯ Ｍ ６０９，６１０に規定される複合サイクル試験を行った。その評価は下記の基準によった。
(4) Anticorrosion property A 150 mm × 90 mm steel plate was sprayed with 130 g / m 2 of zinc, and a sealing agent was sprayed at a target theoretical film thickness of 5 μm to obtain a test piece. A cross-cut leading to the iron ground was attached to the test piece, and a combined cycle test specified in JASO M 609,610 was performed. The evaluation was based on the following criteria.
◎：１ケ月後に赤錆の発生なし
○：１ケ月後に赤錆発生
△：半月後に赤錆発生
×：１週間後に赤錆発生
◎ No red rust occurred after 1 month ○: Red rust occurred after 1 month △: Red rust occurred after half a month ×: Red rust occurred after 1 week
（５）総合評価
◎、○、△、×の４段階で評価した（◎が最良で、あと、この順に続く）。
(5) Comprehensive evaluation It evaluated in four steps, (double-circle), (circle), (triangle | delta), and x ((double-circle) is the best, and it continues in this order).
［試験片１〜２０］
無機分としてコロイダルシリカを用い、樹脂分として、アクリルエマルジョン、またはシリコンエマルジョン、またはアクリルシリコンエマルジョンを用いた。なお、すべての試験片について、いずれのエマルジョンを用いても同様の結果が得られた。添加剤は、分散剤と消泡剤とを用いた。
[Test pieces 1 to 20]
Colloidal silica was used as the inorganic component, and acrylic emulsion, silicon emulsion, or acrylic silicon emulsion was used as the resin component. In addition, the same result was obtained even if any emulsion was used about all the test pieces. As the additive, a dispersant and an antifoaming agent were used.
封孔処理剤における無機分の量と樹脂分の量とを表１に示すように変化させた試験片１〜２０についての評価結果を表１に示す。 Table 1 shows the evaluation results of the test pieces 1 to 20 in which the amount of the inorganic component and the amount of the resin component in the sealing agent are changed as shown in Table 1.
表１に示すように、封孔処理剤として、無機分を１０〜３０質量％、樹脂分を５〜２０質量％配合したものの性能が良好であった。 As shown in Table 1, the performance of what was blended as the sealing agent was 10 to 30% by mass of the inorganic component and 5 to 20% by mass of the resin component.
なかでも、耐熱性や防食性の点では、無機分を１０〜３０質量％、樹脂分を５〜１０質量％配合したものが優れており、無機分を２０〜３０質量％、樹脂分を５〜１０質量％配合したものが特に優れていた。 Among these, in terms of heat resistance and anticorrosive properties, those containing 10 to 30% by mass of the inorganic component and 5 to 10% by mass of the resin component are excellent, and the inorganic component is 20 to 30% by mass and the resin component is 5%. What was blended by 10 to 10% by mass was particularly excellent.
上塗り塗料との付着性の点では、無機分を５〜３０質量％、樹脂分を５〜３０質量％配合したものが優れており、無機分を５〜２０質量％、樹脂分を１０〜３０質量％配合したものが特に優れていた。 In terms of adhesiveness with the top coating, a compound containing 5 to 30% by mass of the inorganic component and 5 to 30% by mass of the resin component is excellent, 5 to 20% by mass of the inorganic component, and 10 to 30% of the resin component. What was blended by mass% was particularly excellent.
１ 鋳鉄管
２ 溶射被膜
６ 空隙
７ 封孔処理剤
DESCRIPTION OF SYMBOLS 1 Cast iron pipe 2 Thermal spray coating 6 Cavity 7 Sealing agent
Claims (3)
封孔処理剤の表面に上塗りが施されている鉄系部材であって、
封孔処理剤は、無機系成分を５〜２０質量％含有するとともに、樹脂成分を１０〜３０質量％含有し、
無機系成分はコロイダルシリカを主成分とし、
樹脂成分はアクリルエマルジョン、シリコンエマルジョン、アクリルシリコンエマルジョンのいずれかを主成分とすることを特徴とする表面処理が施された鉄系部材。 A metal spray coating is formed on the surface of the iron-based member, and an aqueous sealing agent is applied to the surface of the metal spray coating .
An iron-based member that is overcoated on the surface of the sealing agent,
The sealing agent contains 5 to 20% by mass of an inorganic component and 10 to 30% by mass of a resin component,
The inorganic component is mainly composed of colloidal silica,
A surface-treated iron-based member characterized in that the resin component is mainly composed of an acrylic emulsion, a silicon emulsion, or an acrylic silicon emulsion .
鉄系部材の表面に金属溶射被膜を形成し、Form a metal spray coating on the surface of the iron-based member,
金属溶射被膜の表面に封孔処理剤を塗布し、Apply a sealing agent to the surface of the metal spray coating,
封孔処理剤の表面に上塗りを施すことを特徴とする鉄系部材の表面処理方法。A surface treatment method for an iron-based member, characterized in that an overcoat is applied to the surface of a sealing agent.
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| FR2701754B1 (en) * | 1993-02-18 | 1995-04-07 | Pont A Mousson | Pipe element for buried pipe, corresponding buried pipe, and method for protecting such a pipe element. |
| JP3354818B2 (en) * | 1996-12-20 | 2002-12-09 | 株式会社クボタ | External Corrosion Protection Method for Ductile Cast Iron Pipe |
| JP2000192221A (en) * | 1998-12-25 | 2000-07-11 | Kurimoto Ltd | Rust preventing method for zinc thermal sprayed coating |
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