JP4355251B2 - Rust prevention method for steel and painted steel - Google Patents
Rust prevention method for steel and painted steel Download PDFInfo
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Description
本発明は、船舶,土木,建築,プラント,産業機械等向けの防錆能を大幅に向上させた一次および二次の防錆方法と塗装鋼材に関わり,さらに詳しくは,鋼材として特定の合金元素を含有する低合金鋼にZn-Mg合金粉末を含有する無機系ジンクリッチプライマーを塗布することで,該鋼材表面の塗装耐久性を経済的に向上できる防錆方法および防錆鋼材に関するものである。 The present invention relates to primary and secondary rust prevention methods and coated steel materials that have greatly improved rust prevention performance for ships, civil engineering, architecture, plants, industrial machinery, etc., and more specifically, specific alloy elements as steel materials TECHNICAL FIELD The present invention relates to a rust prevention method and a rust prevention steel material that can economically improve the coating durability of the surface of a steel material by applying an inorganic zinc rich primer containing a Zn-Mg alloy powder to a low alloy steel containing bismuth. .
船舶,土木,建築,プラント,産業機械等の鋼構造物等に用いられている鉄鋼材料の腐食対策として,亜鉛粉末を顔料とし,有機溶剤,無機材をビヒクル(液状バインダー成分)とした無機系ジンクリッチペイントが主に用いられる。無機系ジンクリッチペイントは,一次防錆用途と重防食塗装の下塗りの用途がある。一次防錆用途としては,例えば,ショッププライマーとして製鉄所や鋼材加工工場にて適当な素地調整の後,ジンクリッチペイントを塗布する防錆方法が一般的である。 Inorganic systems using zinc powder as a pigment, organic solvents, and inorganic materials as vehicles (liquid binder components) as a corrosion countermeasure for steel materials used in steel structures such as ships, civil engineering, architecture, plants, and industrial machinery Zinc rich paint is mainly used. Inorganic zinc-rich paints are used for primary rust prevention and undercoating for heavy anticorrosion coating. As a primary rust preventive application, for example, a rust preventive method in which zinc rich paint is applied after a suitable substrate preparation at a steel mill or a steel processing factory as a shop primer is common.
ジンクリッチペイントの防食作用は,地鉄に対する亜鉛粉末の犠牲防食作用である。しかし,一次防錆用途でも,環境によっては亜鉛の消失速度が大きく,十分な防錆効果が得られないことがあった。これらの課題に対して,さらに長期にわたり犠牲防食作用を発揮する高性能ジンクリリッチペイントが提案されてきた。例えば,特許文献1,特許文献2ではMg合金粉末による高防錆能タイプのジンクリッチペイントが,または特許文献3では,亜鉛粉末のほかにZn−Mg合金粉末とMg粉末を含有させたジンクリッチペイントが提案された。さらに,特許文献4では,塗料におけるZn-(5〜15 質量%)Mg 合金粉末の高寿命防食性能が示された。また特許文献5では金属組織がZnとMgZn2より構成されるZn- Mg合金粉末の高寿命防食性能が示された。特許文献6では,Zn―Mg合金粉末にZn相およびZnとMgの固溶体相を主成分とした場合に,高い防錆性能が得られることが提案された。
The anticorrosive action of zinc rich paint is the sacrificial anticorrosive action of zinc powder on the steel. However, even in primary rust prevention applications, the disappearance rate of zinc was high depending on the environment, and sufficient rust prevention effects could not be obtained. In response to these problems, high-performance zinc chloride rich paints that exhibit sacrificial anticorrosive action for a longer period have been proposed. For example, in Patent Document 1 and
しかし,前記従来技術のZn−Mg合金粉末は,Zn粉末に比べて防錆性能は向上するが,一次防錆および二次防錆用途で十分な性能とはいえず,更なる改善が求められていた。例えば,一次防錆用途のジンクリッチペイントままでの使用では,鋼材の長期屋外保管で,保管状態や環境条件によっては,重ねて保管した鋼板の隙間部で深い食孔が発生し,鋼材の手入れや,廃棄が依然として必要な場合があるといった課題があった。二次防錆用途として重防食の下塗りとして使用した場合,船舶など,海水が関与する用途環境では,十分な性能とはいえず,更なる改善が求められていた。 However, the prior art Zn-Mg alloy powder has improved rust prevention performance compared to Zn powder, but it cannot be said that it is sufficient for primary and secondary rust prevention applications, and further improvement is required. It was. For example, when using zinc rich paint for primary anti-corrosion applications, the steel material may be stored outdoors for a long period of time. Depending on the storage conditions and environmental conditions, deep pits may form in the gaps between the steel plates that have been stored, and the steel material must be maintained. There was also a problem that disposal may still be necessary. When used as an undercoat for heavy corrosion protection as a secondary rust prevention application, it could not be said that the performance was satisfactory in application environments involving seawater such as ships, and further improvements were required.
本発明は、前述の問題を克服する技術を提供することを目的とするものであり、船舶,土木,建築,プラント用に,防錆能を大幅に向上させた一次および二次防錆方法と防錆鋼材に関わり,さらに詳しくは,鋼材として特定の合金元素を含有する低合金鋼にZn-Mg合金粉末を含有する無機系ジンクリッチプライマーを塗布することで,該鋼材表面の塗装耐久性を経済的に向上できる防錆方法および塗装鋼材に関するものである。 The present invention aims to provide a technique for overcoming the above-mentioned problems, and has primary and secondary rust prevention methods with greatly improved rust prevention capability for ships, civil engineering, construction, and plants. In particular, the coating durability of the steel surface is improved by applying an inorganic zinc rich primer containing Zn-Mg alloy powder to a low alloy steel containing a specific alloy element as a steel material. The present invention relates to a rust prevention method and painted steel that can be economically improved.
本発明者らは、上記課題を解決するためにZn−Mgの合金粉末を含有させた無機系ジンクリッチプライマーの防錆性能について鋭意研究を進めた結果,特定の合金元素を含有する鋼材の表面にZn−Mgを含有した無機系ジンクリッチプライマーを塗布すると,より一層顕著に防錆性能が発現することを知見した。その機構を更に検討した結果,(i)Zn−Mg合金粉末の犠牲防食作用で形成されるZnおよび/またはMgの腐食生成物は,それ自身も防食作用を有する,(ii)Zn−Mg合金粉末の消費速度は,該腐食生成物の特性に大きく依存する,(iii )Zn−Mg合金の腐食生成物が,その生成雰囲気でCuイオンと共存すると,前記(i)の防食作用の向上効果および前記(ii)の消費速度の低減効果が共に強くなることを知見した。さらに検討した結果,(iv)地鉄にCuを特定量含有させておくことで,Cuイオンを塗膜中に添加することなく,安定的に前記(i)〜(iii )の機能を発現できることを知見した。本発明は前記知見に基づいて構成したものであり、その要旨は以下の通りである。 In order to solve the above-mentioned problems, the present inventors have conducted extensive research on the anticorrosion performance of an inorganic zinc rich primer containing an alloy powder of Zn—Mg, and as a result, the surface of a steel material containing a specific alloy element. It was found that when an inorganic zinc rich primer containing Zn-Mg was applied to the rust preventive performance, the rust prevention performance was more remarkably exhibited. As a result of further investigation of the mechanism, (i) Zn and / or Mg corrosion products formed by sacrificial anticorrosive action of Zn-Mg alloy powder itself have anticorrosive action. (Ii) Zn-Mg alloy The consumption rate of the powder greatly depends on the characteristics of the corrosion product. (Iii) When the corrosion product of the Zn-Mg alloy coexists with Cu ions in the generation atmosphere, the effect of improving the anticorrosive action of (i) above. It was also found that the effect of reducing the consumption rate of (ii) is enhanced. As a result of further investigation, (iv) by containing a specific amount of Cu in the base iron, the functions (i) to (iii) can be stably expressed without adding Cu ions to the coating film. I found out. The present invention is configured based on the above findings, and the gist thereof is as follows.
(1)下地鋼材として,Cu:0.1〜0.7質量%を含有し残部がFeおよび不可避的不純物からなる溶接構造用耐食鋼を用い,該鋼材表面に,無機系ジンクリッチプライマーとして,Mg含有量が0.3〜10質量%で残部がZnを主成分とし,粒径が1〜15μmの範囲内にあるZn−Mg合金粉末を5〜80質量%含有し,残部がシリケート溶液を主成分としたビヒクル,溶剤、および塗料添加剤よりなるプライマーを塗布することを特徴とする,鋼材の防錆方法。 (1) As a base steel material, using corrosion resistant steel for welded structure containing Cu: 0.1 to 0.7% by mass with the balance being Fe and unavoidable impurities, as an inorganic zinc rich primer on the surface of the steel material, 5 to 80% by mass of Zn—Mg alloy powder having a Mg content of 0.3 to 10% by mass, the balance being Zn as a main component and a particle size in the range of 1 to 15 μm, and the balance being a silicate solution A method for preventing rusting of steel, characterized by applying a primer comprising a vehicle, a solvent, and a paint additive as main components.
(2)プライマーを塗布して形成されたプライマー塗膜上に,エポキシ系樹脂塗料を200〜400μm塗布することを特徴とする(1)に記載の鋼材の防錆方法。
(3)鋼製の油槽内面の一部または全部を防錆することを特徴とする(1)または(2)に記載の鋼材の防錆方法。
(2) The method for rust prevention of steel according to (1), wherein an epoxy resin coating is applied in an amount of 200 to 400 μm on a primer coating film formed by applying a primer.
(3) The method for preventing rust of a steel material according to (1) or (2), wherein a part or all of an inner surface of a steel oil tank is rust-prevented.
(4)船舶バラストタンク内面の一部または全部を防錆することを特徴とする(2)に記載の鋼材の防錆方法。 (4) The steel ball rust prevention method according to (2), wherein part or all of the inner surface of the ship ballast tank is rust proof.
(5)下地鋼材として,Cu:0.1〜0.7質量%を含有し残部がFeおよび不可避的不純物からなる溶接構造用耐食鋼の表面に,Mg含有量が0.3〜10質量質量%で残部がZnを主成分とし,粒系が1〜15μmの範囲内にあるZn−Mg合金粉末を含有する無機系ジンクリッチプライマー層が5〜30μmの厚さで形成してなることを特徴とする塗装鋼材。 (5) As the base steel material, Cu is contained in the surface of the corrosion-resistant steel for welded structure containing 0.1 to 0.7% by mass of Cu and the balance is Fe and inevitable impurities, and the Mg content is 0.3 to 10% by mass. %, And the balance is formed of an inorganic zinc rich primer layer containing Zn-Mg alloy powder whose main component is Zn and the grain system is in the range of 1 to 15 μm, with a thickness of 5 to 30 μm. Painted steel material.
(6)無機系ジンクリッチプライマー層の表面に,エポキシ系樹脂塗膜を200〜400μmの厚さで形成してなることを特徴とする(5)に記載の塗装鋼材。 (6) The painted steel material according to (5), wherein an epoxy resin coating film is formed on the surface of the inorganic zinc rich primer layer with a thickness of 200 to 400 μm.
(7)鋼製の油槽内面用の材料であることを特徴とする(5)または(6)に記載の塗装鋼材。 (7) The painted steel material according to (5) or (6), which is a steel oil tank inner surface material.
(8)船舶バラストタンク内面用の材料であることを特徴とする(6)に記載の塗装鋼材。 (8) The painted steel material according to (6), which is a material for the inner surface of a ship ballast tank.
以上のように,本発明は,特定の合金元素を含有する低合金鋼にZn−Mg合金粉末を含有する無機系ジンクリッチプライマー層を付与することにより,従来技術よりも優れた防錆性能を経済的に提供するものである。本発明の塗装鋼材は、船舶,土木,建築,プラント,産業機械等向けの船舶,産業機械の構造物の防錆方法または腐食対策用の塗装耐食鋼材として好適である。特に,特定の合金組成を満たす鋼材とZn−Mg粉末を添加した無機ジンクリッチプライマーを組み合わせることで,これまでの防錆方法では十分な耐久性が得られなかった鋼製の油槽(原油タンカーカーゴタンク等)の内面や、船舶バラストタンク内面において、極めて優れた防錆性能を示す。それゆえ,本発明の産業上の価値は極めて高い。 As described above, the present invention provides an antirust performance superior to that of the prior art by providing an inorganic zinc rich primer layer containing Zn-Mg alloy powder to a low alloy steel containing a specific alloy element. It is provided economically. The coated steel material of the present invention is suitable as a rust-preventing method for a ship, civil engineering, building, plant, industrial machine, etc., a structure of an industrial machine, or a corrosion-resistant steel material for corrosion countermeasures. In particular, a steel oil tank (crude oil tanker cargo, which has not been sufficiently durable with conventional rust prevention methods, by combining a steel material satisfying a specific alloy composition and an inorganic zinc rich primer to which Zn-Mg powder is added. It shows extremely excellent rust prevention performance on the inner surface of tanks, etc.) and on the inner surface of ship ballast tanks. Therefore, the industrial value of the present invention is extremely high.
本発明の限定要件を詳細に述べる。 The limiting requirements of the present invention will be described in detail.
まず,鋼材をCu:0.1〜0.7質量%含む鋼材としたのは,前述したZn−Mg合金粉末の腐食生成物の防食性能向上を発現するのに必要なCuイオンを地鉄から自然供給するには,0.1質量%未満の添加は効果がなく,0.7質量%を超える添加では効果があるものの,鋼材の圧延性を低下させるので,0.1〜0.7質量%に限定した。 First, the steel material was made of steel containing 0.1 to 0.7% by mass of Cu. The reason for this is that the Cu ions necessary for improving the anticorrosion performance of the corrosion product of the Zn-Mg alloy powder described above are derived from the ground iron. For natural supply, addition of less than 0.1% by mass is ineffective, and addition of over 0.7% by mass is effective, but reduces the rolling property of the steel material, so 0.1 to 0.7% by mass %.
次に無機系ジンクリッチプライマーの組成について述べる。 Next, the composition of the inorganic zinc rich primer will be described.
金属粉末中Mgの含有量:Mg含有量が0.3質量%未満だと防錆作用の向上効果が低減し,10質量%を超えて添加すると防錆作用が逆に低下するので,その範囲を0.3〜10質量%に限定した。Mgは,Znに比較して原料コストが高いので,経済性を考慮すると,0.3〜2質量%がより好ましい。 Mg content in metal powder: If the Mg content is less than 0.3% by mass, the effect of improving the rust-preventing effect is reduced, and if it exceeds 10% by mass, the rust-preventing effect is adversely reduced. Was limited to 0.3 to 10% by mass. Since Mg has a higher raw material cost than Zn, 0.3 to 2% by mass is more preferable in consideration of economy.
金属粉末の平均粒径:平均粒径がプライマーとして一般的な膜厚(15μm)を超えると,薄塗りが難しくなる。また,1μm未満の場合,粉末の取り扱いや製造性が難しくなるので,その範囲を1〜15μmに限定した。 Average particle diameter of metal powder: When the average particle diameter exceeds a general film thickness (15 μm) as a primer, thin coating becomes difficult. Moreover, since the handling and manufacturability of powder become difficult when it is less than 1 μm, the range is limited to 1 to 15 μm.
無機質系のジンクリッチプライマーのビヒクルとしては、シリケート溶液を主成分としたものを用いることができ、エチルシリケート、リチウムシリケート、ナトリウムシリケート、カリウムシリケート、アンモニウムシリケート等が挙げられるが、特に本発明の用途で好ましいビヒクルはエチルシリケート、カリウムシリケート、リチウムシリケートである。また,防錆性能を損なわない限り,通常のその他の添加剤を加えることができるが,下塗りとして用いる場合,上塗り塗料との密着性を向上させるためにはホウ素などの第三成分を添加してもよい。 As the vehicle of the inorganic zinc rich primer, a silicate solution as a main component can be used, and examples thereof include ethyl silicate, lithium silicate, sodium silicate, potassium silicate, ammonium silicate, and the like. Preferred vehicles are ethyl silicate, potassium silicate, and lithium silicate. In addition, other additives can be added as long as they do not impair the rust prevention performance. However, when used as an undercoat, a third component such as boron is added to improve adhesion to the top coat. Also good.
Zn−Mg合金を含む金属粉末の配合比は,金属粉末の防錆作用および塗膜の健全な物理的特性を両立させるためには,5〜80質量%の範囲に限定する。最大限に防錆性能を発揮させるためには、金属粉末を60〜90質量%、好ましくは70 〜80質量%、ビヒクルを10 〜40質量%、より好ましくは20 〜30質量%を均一に混合するのが好ましい。 The blending ratio of the metal powder containing the Zn—Mg alloy is limited to a range of 5 to 80% by mass in order to achieve both the rust preventive action of the metal powder and the sound physical properties of the coating film. In order to maximize the rust prevention performance, 60 to 90% by mass of metal powder, preferably 70 to 80% by mass, and 10 to 40% by mass of vehicle, more preferably 20 to 30% by mass are uniformly mixed. It is preferable to do this.
次に,本発明の防錆被覆方法の詳細について述べる。一次防錆の場合,先ずサンドブラストやショットブラストなどで十分に錆落としをした鋼材表面に対して、前記のショッププライマーをスプレーや刷毛塗り等により塗布する。本発明の防錆方法においては、前記のショッププライマーの乾燥塗膜の厚さは5〜30μm、好ましくは10〜20μmである。該膜厚が5μm未満である場合には、目的とする防食性は得られ難く、逆に膜厚が30μmを超えると、ショッププライマーの乾燥塗膜層内部において凝集破壊を起こし易く、このため、僅かな衝撃、機械的応力、熱ショックにより塗膜層が剥離し易くなるという欠点が生じるため好ましくない。 Next, the details of the rust-proof coating method of the present invention will be described. In the case of primary rust prevention, the shop primer is first applied by spraying or brushing to the steel surface that has been sufficiently rusted by sandblasting or shot blasting. In the rust prevention method of the present invention, the thickness of the dry paint film of the shop primer is 5 to 30 μm, preferably 10 to 20 μm. When the film thickness is less than 5 μm, it is difficult to obtain the desired anticorrosive property. Conversely, when the film thickness exceeds 30 μm, it tends to cause cohesive failure inside the dry paint layer of the shop primer. This is not preferable because the coating layer is easily peeled off by slight impact, mechanical stress, and heat shock.
二次防錆の場合,プライマー一層では得られない長期耐久性を得ることを目的として,上記のショッププライマーを常温乾燥させて得られた前記塗膜上に、スプレー塗装機、ローラー等により乾燥塗膜の厚さが200〜400μm、好ましくは250〜300μmとなるようにタールエポキシ樹脂塗料JIS2種または1種相当を塗装し、常温乾燥させて仕上げる。
In the case of secondary rust prevention, dry coating is performed on the coating film obtained by drying the above shop primer at room temperature for the purpose of obtaining long-term durability that cannot be obtained with a single primer layer using a spray coating machine, a roller, or the like. The tar epoxy resin
原油タンカーや、地上または地下原油タンクなどの、鋼製の油槽内面の一部または全部を防錆する場合は,本発明の一次防錆,すなわち特定成分の鋼材と前記プライマーを組み合わせることで,優れた耐久性が得られる。さらに,タールエポキシ系塗料を上塗りした場合,より一層の耐久性が得られる。尚、油槽とは上記の原油を扱うもの以外に、軽油、重油、タール等の各種の油を扱うものをすべて含む。 In the case of rust prevention of a part or all of the inner surface of a steel oil tank, such as a crude oil tanker or a ground or underground crude oil tank, it is excellent by combining the primary rust prevention of the present invention, that is, a steel material of a specific component and the primer. Durability. In addition, when tar-epoxy paint is overcoated, even greater durability is obtained. The oil tank includes all kinds of oil tanks, such as light oil, heavy oil, and tar, in addition to the above-described oil tanks.
船舶に装備されるバラストタンク内面の一部または全部を防錆する場合は,本発明の二次防錆,すなわち特定成分の鋼材と前記プライマーを組み合わせる,さらに,タールエポキシ系塗料を上塗りすると,優れた耐久性が得られる。 When rust-proofing part or all of the inner surface of a ballast tank equipped on a ship, it is excellent if the secondary rust prevention of the present invention, that is, combining a steel material of the specific component and the primer, and further applying a tar epoxy paint. Durability.
なお,本発明の防錆方法の効果は,タンクの工作方法に依存しない。鋼製の油槽、または船舶バラストタンク内面の防錆においては,タンクを建造後に防錆処理しても良いし,あらかじめ防錆処理した鋼材を用いてタンクを組立てた後,溶接部などの防錆処理を施す工作方法を用いても,本発明の防錆方法の効果が得られる。 The effect of the rust prevention method of the present invention does not depend on the tank work method. For rust prevention of steel oil tanks or ship ballast tanks, rust prevention treatment may be performed after the tank is built, or after the tank is assembled using a rust-proof steel material, the rust prevention of welded parts, etc. The effect of the rust-preventing method of the present invention can be obtained even by using a work method for performing the treatment.
以下、本発明を実施例に基づいて具体的に説明する。 Hereinafter, the present invention will be specifically described based on examples.
まず,表1に示した金属粉末を用い,下記の配合1に従って表2に示す無機系ジンクリッチプライマーを調整した。
[配合1]
合金粉末 43質量%
防錆顔料 5質量%
沈殿防止剤 3質量%
イソブタノール 13質量%
イソプロパノール 13質量%
トルエン 13質量%
エチルシリケート溶液 10質量%
次に,表3に示す本発明に関わるCu 含有鋼と普通鋼の試験片(板厚6mm 、大きさ500mm ×500mm )を、ショットブラストで完全にスケールを除去した後、表2に示したプライマーをエアスプレーにて乾燥膜厚が15±5μmになるように塗装し,20℃,相対湿度(以降RHと記載することがある)75%で7日間乾燥させてショッププライマー塗装供試材を得た。
First, an inorganic zinc rich primer shown in Table 2 was prepared according to the following formulation 1 using the metal powder shown in Table 1.
[Formulation 1]
Alloy powder 43% by mass
Anti-rust pigment 5% by mass
Anti-precipitation agent 3% by mass
Isobutanol 13% by mass
Isopropanol 13% by mass
Toluene 13% by mass
Ethyl silicate solution 10% by mass
Next, after removing the scale completely from the test pieces (plate thickness 6 mm, size 500 mm × 500 mm) of the Cu-containing steel and the ordinary steel related to the present invention shown in Table 3, the primers shown in Table 2 Is coated with air spray to a dry film thickness of 15 ± 5μm, and dried for 7 days at 20 ° C and 75% relative humidity (hereinafter sometimes referred to as RH) to obtain a shop primer coating specimen. It was.
次いでそれらのプライマー塗膜の上に,タールエポキシ塗料(新日鐵化学,NBコート20FV−R)をエアスプレーにて乾燥膜厚が250〜300μmになるように塗装し,20℃,75質量%RHで7日間乾燥させ,重防食塗装供試材を得た。
[曝露試験1]
表4に示したショッププライマー塗装供試鋼板を2枚一組として図1のように重ね,千葉県君津市製鉄所の製品岸壁空地に1年間曝露した。試験後にショッププライマーを除去し,重ね部で地鉄の腐食が生じた面積および最大腐食深さを表面の凹凸の3次元測定によって求めた。それらの結果を同じく表4に示した。
[曝露試験2]
表5に示したショッププライマー塗装供試材を,新造原油タンカー油槽内面のデッキプレート(天井)およびに底板に溶接し,就航2.5年後に腐食状況を評価した。評価結果を同じく表5に示した。
[曝露試験3]
表6に示した重防食塗装材の塗膜に地鉄まで達するクロスカットを入れた後,以下に示す条件でサイクル腐食試験を3ヶ月実施し,腐食状況を評価した。
Next, tar epoxy paint (Nippon Steel Chemical Co., Ltd., NB coating 20FV-R) was applied on the primer coating by air spray so that the dry film thickness was 250 to 300 μm, and 20 ° C., 75% by mass. It was dried with RH for 7 days to obtain a sample material for heavy anticorrosion coating.
[Exposure test 1]
The two sets of shop primer-coated test steel sheets shown in Table 4 were stacked as shown in Fig. 1 and exposed to the product quay vacant space of Kimitsu Steel Works, Chiba Prefecture for one year. After the test, the shop primer was removed, and the area where the corrosion of the base iron occurred in the overlapped area and the maximum corrosion depth were determined by three-dimensional measurement of surface irregularities. The results are also shown in Table 4.
[Exposure test 2]
The shop primer coating specimens shown in Table 5 were welded to the deck plate (ceiling) and bottom plate inside the new crude oil tanker tank, and the corrosion status was evaluated 2.5 years after service. The evaluation results are also shown in Table 5.
[Exposure test 3]
After putting a cross-cut reaching the base iron into the coating film of heavy anticorrosion coating material shown in Table 6, a cyclic corrosion test was conducted for 3 months under the following conditions to evaluate the corrosion situation.
[サイクル腐食試験条件]
噴霧:35℃,98%RH,4h,5質量%NaCl水溶液噴霧
乾燥:60℃,10〜15%RH,2h
湿潤:50℃ 95%RH以上, 2h
[曝露試験4]
表7に示した重防食塗装材を,船舶バラストタンクのデッキプレート(天井)およびバルクヘッド(隔壁)の中間部に溶接し,塗膜に地鉄まで達するクロスカットを入れた後,就航2.5年後に腐食状況を評価した。
[ショッププライマー塗装鋼材の防錆性能試験結果]
表4に示すように,大気環境において,本発明に関わるCu:0. 1 〜0.7 質量%含有鋼材を用い,Zn−Mg合金粉末を添加したプライマーによる下地被膜を形成させた供試材は,比較例よりも,腐食面積率および最大孔食深さが著しく低いことが認められた。
[Cycle corrosion test conditions]
Spray: 35 ° C., 98% RH, 4 h, 5 mass% NaCl aqueous solution spray Drying: 60 ° C., 10-15% RH, 2 h
Wet: 50 ° C 95% RH or more, 2h
[Exposure test 4]
The heavy-duty anticorrosive coating material shown in Table 7 was welded to the middle part of the ship's ballast tank deck plate (ceiling) and bulkhead (partition wall), and after the cross cut reaching the ground iron was put on the coating film, it was put into service. The corrosion situation was evaluated after 5 years.
[Rust prevention performance test results for shop primer coated steel]
As shown in Table 4, in the atmospheric environment, Cu related to the present invention: 0. The test material in which the base film was formed with a primer containing Zn-Mg alloy powder using a steel material containing 1 to 0.7% by mass has a significantly lower corrosion area ratio and maximum pitting corrosion depth than the comparative example. It was recognized that
表5に示すように,原油タンカー内面の環境において,本発明に関わるCu:0. 1 〜0.7 質量%含有鋼材を用い,Zn−Mg合金粉末を添加したプライマーによる下地被膜を形成させた供試材は比較例よりも,デッキ裏環境では特に腐食面積率の低減が認められ,タンク底板環境では,孔食点数,最大孔食深さが1/2以下に低減することが認められた。
[重防食塗装鋼材の防錆性能試験結果]
表6に示すように,サイクル腐食試験において,本発明に関わるCu:0. 1 〜0.7 質量%含有鋼材を用い,Zn−Mg合金粉末を添加したプライマーによる下地被膜を形成させた後,タールエポキシを塗装した供試材は,比較例よりも,クロスカット周辺から腐食した面積が著しく低いことが認められた。
As shown in Table 5, in the environment inside the crude oil tanker, Cu related to the present invention: In the specimen material in which the base film was formed with a primer containing Zn-Mg alloy powder using a 1 to 0.7 mass% steel material, a reduction in the corrosion area ratio was recognized in the environment behind the deck as compared with the comparative example. In the tank bottom plate environment, it was found that the number of pitting points and the maximum pitting depth were reduced to 1/2 or less.
[Rust prevention performance test results of heavy anticorrosion coated steel]
As shown in Table 6, in the cyclic corrosion test, Cu according to the present invention: The test material coated with tar epoxy after forming a base film with a primer containing Zn-Mg alloy powder using a 1 to 0.7 mass% steel material was corroded from the periphery of the crosscut rather than the comparative example. The measured area was found to be significantly lower.
表7に示すように,バラストタンク内面の環境において,本発明に関わるCu:0. 1 〜0.7 質量%含有鋼材を用い,Zn−Mg合金粉末を添加したプライマーによる下地被膜を形成させた後,タールエポキシを塗装した供試材は,比較例よりもクロスカット周辺から腐食した面積が著しく低いことが認められた。特にその効果は,デッキプレート裏で顕著であった。 As shown in Table 7, in the environment of the inner surface of the ballast tank, Cu: 0. The sample material coated with tar epoxy was corroded from the periphery of the crosscut rather than the comparative example after forming a base film with a primer containing Zn-Mg alloy powder using 1 to 0.7 mass% steel material. The area was found to be significantly lower. The effect was particularly remarkable on the back of the deck plate.
以上の実施例から明らかなように,Cu添加鋼材およびZn−Mg合金粉末を添加した無機系ジンクリッチプライマーを組み合わせると,単独効果の加算よりも遥かに強い相乗効果が発現し,本発明例はいずれも優れた耐塗膜下腐食性を示した。 As is clear from the above examples, when the inorganic zinc rich primer to which the Cu-added steel material and the Zn—Mg alloy powder are added is combined, a synergistic effect much stronger than the addition of the single effect is expressed. All showed excellent corrosion resistance under the coating film.
1…プライマーを塗布した鋼板
2…鋼板の重ねあわせ部
DESCRIPTION OF SYMBOLS 1 ... Steel plate which applied
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