JP5388651B2 - Surface treatment method for cast iron pipe and cast iron pipe - Google Patents
Surface treatment method for cast iron pipe and cast iron pipe Download PDFInfo
- Publication number
- JP5388651B2 JP5388651B2 JP2009077893A JP2009077893A JP5388651B2 JP 5388651 B2 JP5388651 B2 JP 5388651B2 JP 2009077893 A JP2009077893 A JP 2009077893A JP 2009077893 A JP2009077893 A JP 2009077893A JP 5388651 B2 JP5388651 B2 JP 5388651B2
- Authority
- JP
- Japan
- Prior art keywords
- zinc
- cast iron
- iron pipe
- coating
- sealing
- 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.)
- Active
Links
Description
本発明は鋳鉄管の表面処理方法および鋳鉄管に関する。 The present invention relates to a cast iron pipe surface treatment method and a cast iron pipe .
一般に、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、外面に防食皮膜が形成される。この防食皮膜としては、塗膜の他、金属等を溶射した溶射皮膜を形成することが知られている（例えば、特許文献１等）。溶射皮膜は、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、耐久性を要求される埋設鋳鉄管等の防食皮膜として採用されている。 In general, cast iron pipes buried in the ground are formed with an anticorrosion film on the outer surface in order to prevent corrosion due to groundwater or the like. As this anticorrosion film, it is known to form a thermal sprayed film by spraying a metal or the like in addition to the coated film (for example, Patent Document 1). Thermal sprayed coatings are used as anticorrosive coatings for buried cast iron pipes and the like that are required to be durable because they are excellent in mechanical durability to withstand impacts and friction such as backfilled sand.
ところが、溶射皮膜は、図５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、このように空隙や亀裂が多く存在した状態では、防食性能が低下してしまう不具合を有する。溶射皮膜は、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皮膜に対しては、溶射皮膜形成後に、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、溶射皮膜の物理的性質や、溶射皮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、鋳鉄管の溶射皮膜にも適用することが考えられる。 However, as shown in FIG. 5, the thermal spray coating has many voids and cracks in the state of being sprayed, and in such a state where there are many voids and cracks, the anticorrosion performance is deteriorated. . 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 of 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 conceivable 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（溶射皮膜の空隙や亀裂）を埋める。（イ）溶射皮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、薬品と溶射皮膜とを反応させ、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 pores (voids and cracks in the sprayed coating) are filled with this solution. (A) The thermal spray coating is melted by heating to eliminate the holes. (C) Applying chemicals, etc., reacts the chemicals with the sprayed coating, and closes the holes with the reaction products. There are methods.
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などして供給する封孔処理方法が多く採用されている。この場合に用い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 that are supplied by applying a sealing agent that is a highly permeable solution are employed. The sealing agent used in this case is an organic resin such as an epoxy resin (epoxy), an inorganic resin such as a silicon resin (silicate), or a composite in which an organic resin and an inorganic resin are mixed. There is a resin.
なお、溶射皮膜が形成され、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。 A cast iron pipe on which a sprayed coating is formed and further sealed is often overcoated with an outer surface for the purpose of adjusting the appearance.
しかしながら、上記従来の鋳鉄管の表面処理方法では、封孔処理を行うことにより、溶射皮膜の物理的性質や、溶射皮膜の防食性能等の化学的性質が向上するという長所がある一方で、封孔処理された鋳鉄管に対して、さらに、塗料を上塗りした場合に、前記溶射皮膜に塗布する封孔処理剤と、上塗りに用いられる塗料との付着性が悪いため、塗料が剥がれることがあるという短所があった。 However, the conventional cast iron pipe surface treatment method has the advantage that the physical properties of the thermal spray coating and the chemical properties such as the anticorrosion performance of the thermal spray coating are improved by performing the sealing treatment. Further, when the paint is overcoated on the cast iron pipe subjected to the hole treatment, the paint may be peeled off due to poor adhesion between the sealing agent applied to the sprayed coating and the paint used for the top coating. There was a disadvantage.
本発明は上記課題を解決するもので、鋳鉄管の外面などの表面に溶射皮膜が形成され、前記溶射皮膜に封孔処理が行われ、さらに、封孔処理を行った溶射皮膜に塗料を上塗りする鋳鉄管の表面処理方法において、上塗りされた塗料が剥がれることを最小限に抑えることができる鋳鉄管の表面処理方法および鋳鉄管を提供することを目的とするものである。 The present invention solves the above-mentioned problem, and a sprayed coating is formed on the outer surface of the cast iron pipe, and the sprayed coating is subjected to a sealing treatment. Further, the coating is applied to the sprayed coating that has been subjected to the sealing treatment. An object of the present invention is to provide a surface treatment method for a cast iron pipe and a cast iron pipe capable of minimizing the peeling of the overcoated paint.
上記課題を解決するために本発明は、鋳鉄管の表面に溶射皮膜を形成し、前記溶射皮膜に封孔処理剤を供給して溶射皮膜の封孔処理を行い、封孔処理を行った溶射皮膜に塗料を上塗りする鋳鉄管の表面処理方法であって、前記封孔処理剤に亜鉛または亜鉛系合金を含有させ、封孔処理剤における亜鉛または亜鉛系合金の含有量が、溶射皮膜に封孔処理を行うことにより溶射皮膜の表面に形成された被膜の実質的な亜鉛または亜鉛系合金の成分割合が９０質量％以下（但し、０質量％は除く）となる量であることを特徴とする。また、本発明の鋳鉄管は、前記鋳鉄管の表面処理方法により表面処理を行っていることを特徴とする。 In order to solve the above problems, the present invention provides a thermal spray coating formed on a surface of a cast iron pipe, a sealing agent is supplied to the thermal spray coating, and the thermal spray coating is sealed. A surface treatment method for a cast iron pipe in which a coating is overcoated on a film, wherein the sealing agent contains zinc or a zinc-based alloy, and the zinc or zinc-based alloy content in the sealing agent is sealed in the sprayed coating. It is characterized in that the substantial zinc or zinc-based alloy component ratio of the coating formed on the surface of the sprayed coating by performing the hole treatment is 90% by mass or less (excluding 0% by mass). To do. Further, the cast iron pipe of the present invention is characterized in that the surface treatment is performed by the surface treatment method of the cast iron pipe.
この方法によれば、封孔処理剤に亜鉛または亜鉛系合金を含有させることにより、鋳鉄管の表面に形成された溶射皮膜に対して封孔処理をすると、溶射皮膜の表面に、封孔処理剤に含まれている亜鉛や亜鉛系合金の被膜が形成され、封孔処理剤に亜鉛や亜鉛系合金を含まない場合と比較して、溶射皮膜の表面の凹凸状態が大きくなる。したがって、この後に、溶射皮膜に塗料を上塗りした場合に、前記被膜を介して、封孔処理を行った溶射皮膜に対して塗料が良好に付着する。 According to this method, when a sealing treatment is performed on the sprayed coating formed on the surface of the cast iron pipe by containing zinc or a zinc-based alloy in the sealing treatment agent, the sealing treatment is performed on the surface of the sprayed coating. A coating film of zinc or zinc-based alloy contained in the agent is formed, and the uneven state on the surface of the thermal spray coating becomes larger than when the sealing agent does not contain zinc or zinc-based alloy. Therefore, after that, when the coating is applied onto the sprayed coating, the coating adheres well to the sprayed coating subjected to the sealing treatment through the coating.
本発明によれば、封孔処理剤に亜鉛または亜鉛系合金を含有させることにより、溶射皮膜に塗料を上塗りした場合に、封孔処理を行った溶射皮膜に対して塗料が良好に付着し、この結果、溶射皮膜に対して、上塗りされた塗料が剥がれることを防止したり、最小限に抑えたりすることができる。したがって、塗料が剥がれることによる鋳鉄管の外観の低下などを抑えることができる。また、本発明によれば、溶射皮膜の表面に亜鉛や亜鉛系合金の被膜ができるので、封孔処理剤として亜鉛または亜鉛系合金を含有しないものを用いた場合と比較して、防食性能が向上する効果をも有する。 According to the present invention, by containing zinc or a zinc-based alloy in the sealing agent, when the coating is overcoated on the thermal spray coating, the coating adheres well to the thermal spray coating subjected to the sealing treatment, As a result, it is possible to prevent or minimize the overcoating of the sprayed coating. Accordingly, it is possible to suppress a decrease in the appearance of the cast iron pipe due to the peeling of the paint. In addition, according to the present invention, since a coating of zinc or a zinc-based alloy can be formed on the surface of the sprayed coating, the anticorrosion performance is improved as compared with the case where zinc or a zinc-based alloy is not used as the sealing agent. It also has an improving effect.
以下、本発明の実施の形態を図面に基づき説明する。
図１（ａ）、（ｂ）に簡略的に示すように、本発明では、鋳鉄管１の外面などの表面に溶射皮膜２を形成し、この後、溶射皮膜２に封孔処理剤３を塗布するなどして供給して溶射皮膜２の封孔処理を行い（図１（ｃ）参照）、さらに、この封孔処理を行った溶射皮膜２に塗料４を上塗りして（図１（ｄ）参照）製品化している。そして本発明では特に、封孔処理剤３に亜鉛粉末を混入するなどして、封孔処理剤３に亜鉛を含有させている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As schematically shown in FIGS. 1 (a) and 1 (b), in the present invention, a sprayed coating 2 is formed on the outer surface of the cast iron pipe 1, and then a sealing agent 3 is applied to the sprayed coating 2. The thermal spray coating 2 is sealed by supplying it by coating or the like (see FIG. 1C), and the thermal spray coating 2 subjected to the sealing processing is further coated with a paint 4 (FIG. 1D). ) See) Commercialized. In the present invention, in particular, zinc is added to the sealing agent 3 by mixing zinc powder into the sealing agent 3.
次に、本発明の鋳鉄管の表面処理方法に係る実験例（実施例および比較例）を図２に示す図表を参照しながら説明する。
溶射皮膜２を形成する鋳鉄管１のサンプルとして、サンドブラスト鋼板（例えば、縦１５０ｍｍ、横７０ｍｍ、厚さ２ｍｍ）の試験片を用い、この試験片の表面に、溶射皮膜材として、厚さ５０μｍの亜鉛を、電気式アーク溶射法により、２６０ｇ／ｍ２の溶射量で溶射した。
Next, experimental examples (examples and comparative examples) relating to the surface treatment method for cast iron pipes of the present invention will be described with reference to the chart shown in FIG.
As a sample of the cast iron pipe 1 for forming the thermal spray coating 2, a test piece of sandblasted steel plate (for example, 150 mm long, 70 mm wide, 2 mm thick) was used, and a thermal spray coating material having a thickness of 50 μm was used on the surface of this test piece. Zinc was sprayed by an electric arc spraying method at a spraying amount of 260 g / m 2 .
そして、封孔処理剤３として、（ア）有機系樹脂（エポキシ系樹脂）、（イ）有機無機複合型樹脂、（ウ）無機系樹脂（シリケート系樹脂）、（エ）各種の材料（樹脂基材）に亜鉛粉末を混合させたものを、それぞれ、封孔処理剤の目標膜厚が１０μｍとなるように、塗布した。さらに、上塗りする塗料４としてアクリル樹脂塗料を用いて、試作番号１〜８の試験片を作成した。なお、詳しくは、後述するが、試作番号１〜３は、比較例としての試験片（図３（ａ）、（ｂ）参照）、試作番号４〜８は本発明の実施例としての試験片である。また、試作番号９の試験片は他の比較例であり、封孔処理剤３を塗布していない溶射皮膜２に塗料４を上塗りして作成したもの（図４（ａ）、（ｂ）参照）である。 Then, as the sealing agent 3, (a) organic resin (epoxy resin), (b) organic-inorganic composite resin, (c) inorganic resin (silicate resin), (d) various materials (resin The base material was mixed with zinc powder so that the target film thickness of the sealing agent was 10 μm. Furthermore, test pieces of prototype numbers 1 to 8 were prepared using an acrylic resin paint as the paint 4 to be overcoated. Although details will be described later, trial numbers 1 to 3 are test pieces as comparative examples (see FIGS. 3A and 3B), and trial numbers 4 to 8 are test pieces as examples of the present invention. It is. Moreover, the test piece of trial production number 9 is another comparative example, which was prepared by overcoating the sprayed coating 2 on which the sealing agent 3 is not applied with the paint 4 (see FIGS. 4A and 4B). ).
各試験片に対して、付着性試験として碁盤目試験（ＪＩＳ規格 Ｋ−５６００−５−６）を行い、また、腐食試験として、塩水噴霧試験を行った。なお、塩水噴霧試験としては、上塗りをしない状態で、５０×５０ｍｍのクロスカットを形成した状態で試験片の表面に塩水を噴霧し、赤錆発生までの期間を測定した。図２に示す図表において、これらの測定結果を示す。なお、図２に示す図表において、タイプII（試作番号４〜８）とは、概略的な断面構造が、図１（ｄ）または図１（ｃ）に示すような本発明の実施例に係るもの（後述するように、溶射皮膜２の表面に封孔処理剤３の亜鉛成分を含有する皮膜３ａを有するもの）である。また、タイプＩ（試作番号１〜３）とは、図３（ｂ）または図３（ａ）に示すような断面形状のもの（比較例であり、溶射皮膜２の表面に封孔処理剤３の表面に、亜鉛成分を含まない皮膜３ｂを有するもの）である。タイプIIIとは、図４（ｂ）または図４（ａ）に示すように、封孔処理剤３が供給されていない溶射皮膜２に塗料４が上塗りされた他の比較例の断面形状のものである。 A cross-cut test (JIS standard K-5600-5-6) was performed as an adhesion test on each test piece, and a salt spray test was performed as a corrosion test. In addition, as a salt spray test, salt water was sprayed on the surface of the test piece in a state where a 50 × 50 mm cross-cut was formed without overcoating, and the period until the occurrence of red rust was measured. The measurement results are shown in the chart shown in FIG. In the chart shown in FIG. 2, type II (prototype numbers 4 to 8) is a schematic sectional structure according to an embodiment of the present invention as shown in FIG. 1 (d) or FIG. 1 (c). (As will be described later, the surface of the thermal spray coating 2 has a coating 3a containing the zinc component of the sealing agent 3). Type I (prototype Nos. 1 to 3) is a cross-sectional shape as shown in FIG. 3B or FIG. And the surface 3b having a coating 3b not containing a zinc component). As shown in FIG. 4 (b) or FIG. 4 (a), the type III has a cross-sectional shape of another comparative example in which the thermal spray coating 2 to which the sealing agent 3 is not supplied is coated with the paint 4 It is.
（１）塗料との付着性について
亜鉛を含有しない有機系樹脂（エポキシ系樹脂）の封孔処理剤３を用いた試作番号１の試験片、および、亜鉛を含有しない有機無機複合型樹脂の封孔処理剤３を用いた試作番号２の試験片では、付着性試験としての碁盤目試験において、上塗りした塗料４が剥がれることが少なく、比較的良好な付着性を得られた（溶射皮膜２を形成していない試作番号９の試験片の場合と同等である）が、亜鉛を含有しない無機系樹脂（シリケート系樹脂）の封孔処理剤３を用いた試作番号３の試験片では、碁盤目試験において上塗りした塗料４が比較的多く剥がれて、付着性に劣ることを確認できた。
(1) Adhesiveness with paints Test piece No. 1 using a sealing agent 3 of an organic resin (epoxy resin) that does not contain zinc, and sealing of an organic-inorganic composite resin that does not contain zinc In the test piece of Prototype No. 2 using the pore treating agent 3, in the cross-cut test as the adhesion test, the overcoated paint 4 was hardly peeled off, and relatively good adhesion was obtained (the thermal spray coating 2 was applied). In the case of the test piece of trial number 3 using the sealing agent 3 of inorganic resin (silicate resin) that does not contain zinc, it is the same as the case of the test piece of trial number 9 that is not formed) In the test, a relatively large amount of the overcoated paint 4 was peeled off, and it was confirmed that the adhesion was poor.
しかしながら、無機系樹脂（シリケート系樹脂）の封孔処理剤３の場合でも、亜鉛粉末を５質量％含ませた封孔処理剤３を用いた試作番号４の試験片では、碁盤目試験において上塗りした塗料４が剥がれることが少なくなり、付着性が良好となった。また、無機系樹脂（シリケート系樹脂）の封孔処理剤３の場合において、亜鉛粉末の量をさらに増加させてなる、亜鉛粉末を３５質量％含ませた封孔処理剤３を用いた試作番号５の試験片では、碁盤目試験において上塗りした塗料４が剥がれることが殆どなくなり、付着性が非常に良好となった。この原因は、封孔処理剤３に含まれる亜鉛成分が溶射皮膜２中に浸透せず、溶射皮膜２の表面に薄膜状に残り、この亜鉛成分を多く含んだ薄膜部分である皮膜３ａ（図１（ｃ）に簡略的に示す）の表面が凹凸形状となり、この凹凸形状部分で上塗りした塗料４との付着性が向上したと考えられる。 However, even in the case of the sealing agent 3 of inorganic resin (silicate resin), the test piece No. 4 using the sealing agent 3 containing 5% by mass of zinc powder was overcoated in the cross-cut test. The applied paint 4 was less peeled off and the adhesion was good. In addition, in the case of the sealing agent 3 for inorganic resin (silicate resin), the trial production number using the sealing agent 3 containing 35% by mass of zinc powder, further increasing the amount of zinc powder. In the test piece 5, the top-coated paint 4 hardly peeled off in the cross-cut test, and the adhesion was very good. This is because the zinc component contained in the sealing agent 3 does not penetrate into the thermal spray coating 2 and remains in the form of a thin film on the surface of the thermal spray coating 2, and the coating 3a is a thin film portion containing a large amount of this zinc component (see FIG. It is considered that the surface of 1) (shown simply in 1 (c)) has a concavo-convex shape, and the adhesion with the paint 4 overcoated with the concavo-convex portion is improved.
すなわち、比較例として、図３（ａ）、（ｂ）に簡略的に示すように、封孔処理剤３として亜鉛成分が含まれず、樹脂成分だけなどであるものを用いると、封孔処理を行うことにより、封孔処理剤３が塗布された溶射皮膜２の表面が、封孔処理を行っていない場合と比較して平坦化されるなどし、これにより、塗料４を上塗りした場合に、封孔処理された溶射皮膜２と、上塗りされた塗料４との付着性が悪くなり、塗料４が剥がれ易くなると考えられる。これに対して、本実施の形態のように、封孔処理剤３として亜鉛を含有させると、このような短所が、上述した理由により改善される。 That is, as a comparative example, as schematically shown in FIGS. 3A and 3B, when a sealing component 3 that does not contain a zinc component and contains only a resin component is used, sealing processing is performed. By doing so, the surface of the thermal spray coating 2 to which the sealing agent 3 is applied is flattened as compared with the case where the sealing treatment is not performed, and thus when the paint 4 is overcoated, It is considered that the adhesion between the thermally sprayed coating 2 subjected to the sealing treatment and the overcoated paint 4 is deteriorated, and the paint 4 is easily peeled off. On the other hand, when zinc is contained as the sealing agent 3 as in the present embodiment, such disadvantages are improved for the reasons described above.
但し、封孔処理剤３に亜鉛を過剰に含有させると、亜鉛粉末を５０質量％含ませた試作番号６の試験片の場合のように、上塗りした塗料４が極めて剥がれ易くなり、付着性が大きく低下した。これは、亜鉛の含有量が高くなり過ぎる（実質的には、溶射皮膜２の表面に形成された皮膜３ａの９５質量％以上を占めると考えられる）ことにより、亜鉛粉末同士をつなぐ樹脂量が極めて少なくなり、その結果、亜鉛粉末同士が分離して、皮膜３ａとして一体化された状態ではなくなり、付着性が低下したと考えられる。なお、溶射皮膜２の表面に形成される皮膜３ａの亜鉛の実質的な質量％は、９０質量％以下であることが適当であり、９０質量％を越えると、付着性が悪くなった。 However, when zinc is contained excessively in the sealing agent 3, the overcoated paint 4 becomes very easy to peel off as in the case of the test piece of Prototype No. 6 containing 50% by mass of zinc powder, and adhesion is improved. It was greatly reduced. This is because the zinc content becomes too high (substantially 95% by mass or more of the coating 3a formed on the surface of the thermal spray coating 2), so that the amount of resin that connects the zinc powders is reduced. As a result, the zinc powders are separated from each other and are not integrated as the coating 3a, and it is considered that the adhesiveness is lowered. In addition, it is appropriate that the substantial mass% of zinc in the coating 3a formed on the surface of the thermal spray coating 2 is 90% by mass or less, and when it exceeds 90% by mass, the adhesion is deteriorated.
また、封孔処理剤３として、その基材が有機系樹脂（エポキシ系樹脂）であるものや有機無機複合型であるものの場合でも、亜鉛粉末を３５質量％含ませた封孔処理剤３を用いた試作番号７、８の試験片では、碁盤目試験において上塗りした塗料４が剥がれることが殆どなくなり、付着性が極めて良好となり、付着性が向上したことが認められた。 Further, as the sealing treatment agent 3, even when the base material is an organic resin (epoxy resin) or an organic-inorganic composite type, the sealing treatment agent 3 containing 35% by mass of zinc powder is used. In the test pieces of prototype numbers 7 and 8 used, it was confirmed that the overcoated paint 4 hardly peeled off in the cross-cut test, the adhesion was extremely good, and the adhesion was improved.
（２）腐食性能について
上述したように、上塗りしない各試験片に対して、腐食試験として塩水噴霧試験を行った。ここで、図４（ａ）、（ｂ）に示すような溶射皮膜２に封孔処理剤３が供給されていない試作番号９の試験片での、塩水噴霧試験における錆発生期間を１（比較用単位期間）とし、塩水噴霧試験において錆発生期間が、鋳鉄部分が露出した試作番号９の試験片での場合の、何倍の期間で錆が発生したかを図２の図表に示している。亜鉛を含有しない有機系樹脂（エポキシ系樹脂）の封孔処理剤３を用いた試作番号１の試験片の錆発生期間は４、亜鉛を含有しない有機無機複合型の封孔処理剤３を用いた試作番号２の試験片の錆発生期間は５、亜鉛を含有しない無機系樹脂（シリケート系樹脂）の封孔処理剤３を用いた試作番号３の試験片の錆発生期間は７であり、これらの中では、無機系樹脂（シリケート系樹脂）の封孔処理剤３を用いた試作番号３の試験片が錆の発生するまでの期間が最も長かった。
(2) About corrosion performance As mentioned above, the salt spray test was done as a corrosion test with respect to each test piece which is not overcoated. Here, the rust generation period in the salt spray test is 1 (comparison) with the test piece of trial number 9 in which the sealing agent 3 is not supplied to the thermal spray coating 2 as shown in FIGS. 4 (a) and 4 (b). The chart of FIG. 2 shows how many times the rust was generated in the salt spray test when the rust generation period was the test piece No. 9 with the cast iron portion exposed. . Rust generation period of test piece No. 1 using an organic resin (epoxy resin) sealing agent 3 that does not contain zinc is 4, and an organic-inorganic composite sealing agent 3 that does not contain zinc is used. The rust generation period of the test piece No. 2 was 5, and the rust generation period of the test piece No. 3 using the sealing agent 3 of inorganic resin (silicate resin) not containing zinc was 7. Among these, the test piece of trial number 3 using the sealing agent 3 of inorganic resin (silicate resin) had the longest period until rust was generated.
これに対して、無機系樹脂（シリケート系樹脂）の封孔処理剤３において、亜鉛粉末を含ませると、亜鉛粉末を５質量％含ませた封孔処理剤３を用いた試作番号４の試験片の錆発生期間は８、亜鉛粉末を３５質量％含ませた封孔処理剤３を用いた試作番号５の試験片の錆発生期間は９、亜鉛粉末を５０質量％含ませた封孔処理剤３を用いた試作番号６の試験片の錆発生期間は８であり、何れも、亜鉛粉末を含まない場合と比較して、封孔処理剤３に亜鉛粉末を含ませた場合の試験片が、錆が発生するまでの期間が長くなり、防食性能が向上している。 On the other hand, in the sealing agent 3 for inorganic resin (silicate resin), when zinc powder is included, the test for trial number 4 using the sealing agent 3 containing 5% by mass of zinc powder is used. The rust generation period of the piece is 8, the rust generation period of the test piece No. 5 using the sealing agent 3 containing 35% by mass of zinc powder is 9, and the sealing process of 50% by mass of zinc powder is included. The test piece No. 6 using the agent 3 has a rust generation period of 8, and in all cases, the test piece in which the zinc powder was included in the sealing agent 3 as compared with the case in which the zinc powder was not included. However, the period until rust occurs becomes longer and the anticorrosion performance is improved.
また、封孔処理剤３として、基材が有機系樹脂（エポキシ系樹脂）であるものや有機無機複合型であるものの場合でも、亜鉛粉末を３５質量％含ませた封孔処理剤３を用いた試作番号７、８の試験片での錆発生期間は６、７であり、何れの場合も亜鉛粉末を含まない場合と比較して、錆が発生するまでの期間が長くなり、防食性能が向上したことを確認できた。 Further, as the sealing treatment agent 3, even when the base material is an organic resin (epoxy resin) or an organic-inorganic composite type, the sealing treatment agent 3 containing 35% by mass of zinc powder is used. The rust generation period in the test pieces of prototype Nos. 7 and 8 was 6 and 7, and in each case, the period until rust generation was longer and the anticorrosion performance was higher than when no zinc powder was included. It was confirmed that there was an improvement.
なお、上記実施の形態では、封孔処理剤３に亜鉛粉末を混合させて含有させたが、これに限るものではなく、亜鉛粉末に代えて、亜鉛系合金粉末を混合させるなどして含有させてもよい。 In the above embodiment, the zinc treatment powder 3 is mixed and contained in the sealing agent 3. However, the present invention is not limited to this, and instead of zinc powder, zinc alloy powder is mixed and contained. May be.
１ 鋳鉄管
２ 溶射皮膜
３ 封孔処理剤
４ 塗料
1 Cast iron pipe 2 Thermal spray coating 3 Sealing agent 4 Paint
Claims (2)
前記封孔処理剤に亜鉛または亜鉛系合金を含有させ、
封孔処理剤における亜鉛または亜鉛系合金の含有量が、溶射皮膜に封孔処理を行うことにより溶射皮膜の表面に形成された被膜の実質的な亜鉛または亜鉛系合金の成分割合が９０質量％以下（但し、０質量％は除く）となる量である
ことを特徴とする鋳鉄管の表面処理方法。 Surface treatment of a cast iron pipe which forms a thermal spray coating on the surface of the cast iron pipe, supplies a sealing agent to the thermal spray coating, seals the thermal spray coating, and coats the thermal spray coating subjected to the sealing treatment with a paint. A method,
Containing zinc or a zinc-based alloy in the sealing agent ,
The content of zinc or zinc-based alloy in the sealing agent is 90% by mass of the substantial zinc or zinc-based alloy component of the coating formed on the surface of the sprayed coating by sealing the sprayed coating. A cast iron pipe surface treatment method characterized in that the amount is as follows (excluding 0% by mass) .
ことを特徴とする鋳鉄管。Cast iron pipe characterized by that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009077893A JP5388651B2 (en) | 2009-03-27 | 2009-03-27 | Surface treatment method for cast iron pipe and cast iron pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009077893A JP5388651B2 (en) | 2009-03-27 | 2009-03-27 | Surface treatment method for cast iron pipe and cast iron pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2010229484A JP2010229484A (en) | 2010-10-14 |
| JP5388651B2 true JP5388651B2 (en) | 2014-01-15 |
Family
ID=43045568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009077893A Active JP5388651B2 (en) | 2009-03-27 | 2009-03-27 | Surface treatment method for cast iron pipe and cast iron pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5388651B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103375657B (en) * | 2012-04-17 | 2016-08-17 | 新兴铸管股份有限公司 | A kind of iron-based pipeline containing corrosion-inhibiting coating |
| FR2994243B1 (en) * | 2012-08-06 | 2016-06-10 | Saint-Gobain Pam | IRON PIPING ELEMENT FOR BOREHOLE PIPING, COMPRISING AN EXTERIOR COATING |
| CN102925849B (en) * | 2012-10-18 | 2014-06-25 | 马鞍山马钢表面工程技术有限公司 | Composite hole sealing agent for thermal sprayed coating and using method for composite hole sealing agent |
| FR3009999B1 (en) * | 2013-09-02 | 2017-04-21 | Saint-Gobain Pam | EXTERIOR COATING FOR IRON - BASED PIPING ELEMENT, COATED PIPING ELEMENT AND METHOD FOR COATING DEPOSITION. |
| CN108221016B (en) * | 2017-12-21 | 2019-10-01 | 广州传福化学技术有限公司 | A kind of zinc-plated sealer and its application method |
| CN109136597A (en) * | 2018-09-13 | 2019-01-04 | 安阳工学院 | One kind improving the corrosion proof method of as cast condition zinc-aluminum eutectic alloy by addition Nd |
| CN109897977A (en) * | 2019-03-22 | 2019-06-18 | 安阳工学院 | One kind improving the corrosion proof method of as cast condition zinc-aluminum eutectic alloy by addition yttrium |
| CN114082959A (en) * | 2021-11-23 | 2022-02-25 | 国铭铸管股份有限公司 | Surface treatment process for nodular cast pipes |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11100801A (en) * | 1997-07-31 | 1999-04-13 | Nippon Steel Corp | Rail excellent in corrosion preventiveness and rail surface layer residual stress measuring method |
| JPH11351518A (en) * | 1998-06-05 | 1999-12-24 | Nisshin Steel Co Ltd | Radiant tube having high high-temperature oxidation resistance and its manufacture |
| JP2000002396A (en) * | 1998-06-18 | 2000-01-07 | Furukawa Electric Co Ltd:The | Resin-covered copper tube |
| JP3386405B2 (en) * | 1999-03-29 | 2003-03-17 | 大日本インキ化学工業株式会社 | Externally coated cast iron tube |
-
2009
- 2009-03-27 JP JP2009077893A patent/JP5388651B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010229484A (en) | 2010-10-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5388651B2 (en) | Surface treatment method for cast iron pipe and cast iron pipe | |
| Cong et al. | Wear behavior of corroded Al-Al2O3 composite coatings prepared by cold spray | |
| MX265494B (en) | Aqueous coating composition with corrosion resistant thin-coat aluminium pigments method for production and use therof. | |
| JP5681332B2 (en) | Paint and coated steel | |
| TW200738907A (en) | Thermal barrier coatings and processes for applying same | |
| JP2006249459A (en) | Chemical conversion primary treatment agent for steel material, chemical conversion primary treatment method, and steel material with corrosion protective coating film | |
| CA2922163A1 (en) | Exterior finish for iron-based underground piping element, coated piping element and coating deposition process | |
| KR101112614B1 (en) | surface modification process of zinc-plated metal articles for high corrosion resistance | |
| JPWO2019069724A1 (en) | Reactive paint for steel that provides high corrosion resistance | |
| CN203247307U (en) | Composite coating for corrosion prevention for metal surface | |
| CN105088122B (en) | The Ni Al of Mg alloy surface2O3‑AlB12The preparation method of composite coating | |
| JP7285667B2 (en) | Method for manufacturing cast-iron pipe and method for preventing surface corrosion of cast-iron pipe | |
| JP5945185B2 (en) | Method for manufacturing pipe component with anti-corrosion coating on outer surface | |
| MXPA05001964A (en) | Anticorrosive. | |
| JP2007291440A (en) | Corrosion protection coating and method for forming the same | |
| JP2002105393A (en) | Anticorrosive powder coating composition for steel material, steel material coated with the coating and method for producing the coated steel material | |
| JP5653084B2 (en) | Iron-based member subjected to surface treatment and surface treatment method of iron-based member | |
| JP2007002328A (en) | Plated welded steel pipe excellent in corrosion resistance at weld zone and method for producing the same | |
| JP5820920B2 (en) | Iron-based member with surface treatment | |
| WO2009081452A1 (en) | Corrosion inhibitor and process for producing the same | |
| JP6623543B2 (en) | Organic resin coated steel | |
| JP6583012B2 (en) | Polyolefin-coated steel pipe and method for producing the same | |
| JP2009256761A (en) | Corrosion prevention method by plating-resin film for iron based material | |
| RU2699691C2 (en) | Method of restoration of art works and their elements made of ferrous metal | |
| JP2013036250A (en) | Open-close structure for manhole with anticorrosion film formed, and anticorrosion film formation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20110921 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20130523 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20130528 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20130725 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20130910 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20131008 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 5388651 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |