JPH0813158A - Steel excellent in weatherability and surface treating method therefor - Google Patents
Steel excellent in weatherability and surface treating method thereforInfo
- Publication number
- JPH0813158A JPH0813158A JP14502094A JP14502094A JPH0813158A JP H0813158 A JPH0813158 A JP H0813158A JP 14502094 A JP14502094 A JP 14502094A JP 14502094 A JP14502094 A JP 14502094A JP H0813158 A JPH0813158 A JP H0813158A
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- rust
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- ions
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐候性に優れる鋼材お
よびその新しい表面処理方法に関し、特に、大気腐食環
境に対する保護作用を有する錆、いわゆる耐候性錆の層
が、短期間で育成される鋼材、および耐候性錆早期育成
のための鋼材の表面処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel material having excellent weather resistance and a new surface treatment method thereof, and in particular, a layer of rust having a protective action against atmospheric corrosive environment, so-called weather resistant rust, is grown in a short period of time. TECHNICAL FIELD The present invention relates to a steel material and a surface treatment method for a steel material for early growth of weather resistant rust.
【０００２】[0002]
【従来の技術】一般に鋼にＰ，Ｃｕ，Ｃｒ，Ｎｉ等の元
素を添加することにより、大気中における耐食性を向上
させることができる。これらの低合金鋼は耐候性鋼と呼
ばれるが、屋外において数年で腐食に対して保護性のあ
る錆（以下耐候性錆という）を形成し、以後塗装等の耐
食処理作業を不要とするいわゆるメインテナンスフリー
鋼である。2. Description of the Related Art Generally, by adding elements such as P, Cu, Cr and Ni to steel, corrosion resistance in the atmosphere can be improved. These low alloy steels are called weather resistant steels, but they form rust that protects against corrosion (hereinafter referred to as weather resistant rust) in the outdoors for several years, and the so-called corrosion-resistant treatment work such as painting is unnecessary thereafter. Maintenance-free steel.
【０００３】しかしながら、耐候性錆が形成されるまで
に数年かかるため、それまでの期間中に赤錆や黄錆等の
浮き錆や流れ錆を生じてしまい、外見的に好ましくない
ばかりでなく周囲の環境の汚染原因にもなるという問題
点を残している。この問題は、海辺などの海塩粒子飛来
環境において特に顕著である。However, since it takes several years until the weather-resistant rust is formed, floating rust such as red rust and yellow rust and flow rust occur during the period until then, which is not only visually unfavorable but also surrounding. It also causes the pollution of the environment. This problem is particularly remarkable in a sea salt particle flying environment such as the seaside.
【０００４】[0004]
【発明が解決しようとする課題】この問題について、た
とえば特公昭５３−２２５３０号公報においては、特定
の樹脂を被覆することにより、流れ錆を生じることなく
安定錆を形成させる方法が開示されている。また、特公
昭５６−３３９１１号公報においては、２層被覆による
方法が開示れている。With respect to this problem, for example, Japanese Patent Publication No. 53-22530 discloses a method of forming a stable rust by coating a specific resin without causing flow rust. . Further, Japanese Patent Publication No. 56-33911 discloses a method of coating two layers.
【０００５】しかし、特公昭５３−２２５３０号公報に
開示された方法の場合、腐食性の高い環境では流れ錆の
防止が不十分であるばかりでなく、安定錆の生成促進に
もおとることが判明した。また、特公昭５６−３３９１
１号公報に開示された方法の場合、流れ錆の防止には優
れるものの、安定錆を形成するまでに、長時間を要して
しまうものである。However, in the case of the method disclosed in Japanese Patent Publication No. 53-22530, not only the flow rust is not sufficiently prevented in a highly corrosive environment, but also stable rust generation can be promoted. found. In addition, Japanese Examined Japanese Patent Publication 56-3391
In the case of the method disclosed in Japanese Patent Publication No. 1, although it is excellent in preventing flow rust, it takes a long time to form stable rust.
【０００６】他方、特開平１−１４２０８８号におい
て、リン酸塩被膜を形成させる表面処理方法が提案され
ている。しかし、リン酸塩被膜を形成させる以前に適当
な前処理を施す必要がある等処理の内容が複雑であり、
また鋼材の溶接が必要な場合は溶接部に処理を施すこと
は容易ではなく、建築構造物には適用が困難なものであ
るとともに、かかる処理を行わない場合と比較すれば、
浮き錆や流れ錆の量は低減してはいるものの、完全なも
のではなかった。On the other hand, Japanese Unexamined Patent Publication No. 1-142088 proposes a surface treatment method for forming a phosphate coating. However, the content of the treatment is complicated, such as the need to perform an appropriate pretreatment before forming the phosphate coating,
In addition, when welding of steel material is necessary, it is not easy to apply treatment to the welded portion, and it is difficult to apply to a building structure, and in comparison with the case where such treatment is not performed,
Although the amount of floating rust and flow rust was reduced, it was not perfect.
【０００７】そこで、本発明の主たる課題は、簡単な処
理により、赤錆や黄錆等の浮き錆や流れ錆をほとんど生
じることなく、大気腐食環境に対して安定した耐候性錆
を生成すること、および耐候性錆が早期に育成される鋼
材を提供することにある。Therefore, the main object of the present invention is to produce stable weather-resistant rust against atmospheric corrosive environment by simple treatment, with almost no floating rust such as red rust or yellow rust or flow rust. Another object of the present invention is to provide a steel material in which weather-resistant rust is quickly grown.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
の本第１発明に係る耐候性に優れた鋼材の表面処理方法
は、鋼材の表面あるいは鋼材の錆層に、アルミ付着量が
乾燥質量で１．０ｇ／ｍ2 以上となるように、アルミニ
ウムイオンを含む水溶液を塗布し、水分乾燥後、その上
層に、乾燥膜厚が５μｍ以上１５０μｍ以下である有機
樹脂被膜を形成することを特徴とするものである。A method for surface treatment of a steel material having excellent weather resistance according to the first aspect of the present invention for solving the above-mentioned problems is a method in which an aluminum adhesion amount is a dry mass on a surface of a steel material or a rust layer of the steel material. To 1.0 g / m 2 or more, an aqueous solution containing aluminum ions is applied, and after drying the water, an organic resin film having a dry film thickness of 5 μm or more and 150 μm or less is formed thereon. To do.
【０００９】また、本第２発明に係る鋼材の表面処理方
法は、鋼材の表面あるいは鋼材の錆層に、アルミ付着量
が乾燥質量で１．０ｇ／ｍ2 以上、Ｃｕ、Ｆｅ、Ｐ、Ｃ
ｒ、Ｎｉイオンのうちの１種あるいは２種以上のイオン
の総付着量が、０．１ｇ／ｍ2 以上となるように、アル
ミニウムイオンと、Ｃｕ、Ｆｅ、Ｐ、Ｃｒ、Ｎｉイオン
のうちの１種あるいは２種以上のイオンを含んだ水溶液
を塗布し、水分乾燥後、その上層に、乾燥膜厚が５μｍ
以上１５０μｍ以下である有機樹脂被膜を形成すること
を特徴とするものである。Further, in the surface treatment method for a steel material according to the second aspect of the present invention, the amount of aluminum adhering to the surface of the steel material or the rust layer of the steel material is 1.0 g / m 2 or more in dry mass, Cu, Fe, P, C.
Of the aluminum ions and Cu, Fe, P, Cr, and Ni ions, the total amount of one or more of the r and Ni ions attached is 0.1 g / m 2 or more. An aqueous solution containing one or more ions is applied, dried with water, and then a dry film thickness of 5 μm is formed on the upper layer.
It is characterized by forming an organic resin film having a thickness of 150 μm or less.
【００１０】さらに、本第３発明に係る耐候性に優れた
鋼材は、鋼材の表面あるいは鋼材の錆層に、硫酸アルミ
ニウムを乾燥質量で１〜６５質量％含む有機樹脂塗料に
よって、乾燥膜厚が５μｍ以上１５０μｍ以下である被
膜が形成されていることを特徴とするものである。Further, the steel material excellent in weather resistance according to the third aspect of the present invention has a dry film thickness formed by an organic resin coating material containing aluminum sulfate in a dry mass of 1 to 65 mass% on the surface of the steel material or the rust layer of the steel material. A coating film having a thickness of 5 μm or more and 150 μm or less is formed.
【００１１】そして、本第４発明に係る耐候性に優れた
鋼材は、鋼材の表面あるいは鋼材の錆層に、硫酸アルミ
ニウムを乾燥質量で１〜６４質量％、α−ＦｅＯＯＨを
乾燥質量で１〜６４質量％、その合計量を乾燥質量で６
５質量％以下含む有機樹脂塗料によって、乾燥膜厚が５
μｍ以上１５０μｍ以下である被膜が形成されているこ
とを特徴とするものである。The steel material having excellent weather resistance according to the fourth aspect of the present invention has a dry mass of 1 to 64 mass% aluminum sulfate and 1 mass% to α-FeOOH dry mass on the surface of the steel material or the rust layer of the steel material. 64% by mass, the total amount of dry mass is 6
With an organic resin paint containing 5% by mass or less, the dry film thickness is 5
It is characterized in that a film having a thickness of not less than μm and not more than 150 μm is formed.
【００１２】[0012]
【作用】本発明者等は、２０年以上暴露して生成させた
安定錆を解析した結果、安定錆が主としてα−ＦｅＯＯ
Ｈからなる微細結晶の緻密な集合により構成されている
ことを解明した。このため、安定錆を早期に生成するた
めには、緻密なα−ＦｅＯＯＨを迅速に生成することが
重要となる。それとともに、α−ＦｅＯＯＨによる安定
錆を生成している間に、流れ錆や浮き錆を防止する必要
がある。The present inventors analyzed stable rust produced by exposure for 20 years or more, and found that stable rust was mainly α-FeOO.
It was clarified that it is composed of a dense assembly of fine crystals of H. Therefore, in order to produce stable rust early, it is important to produce dense α-FeOOH rapidly. At the same time, it is necessary to prevent flow rust and floating rust while generating stable rust due to α-FeOOH.
【００１３】また、耐候性鋼において、耐候性錆の構造
が緻密であれば、物理的に大気腐食環境を遮断し易く、
また浮き錆や流れ錆の根本的な原因であるＦｅイオンの
溶出を軽減する。しかし一方、耐候性錆中に割れや細孔
があると水や酸素の供給経路となり、耐候性錆の防食性
が低減する。このため、緻密で連続した錆層を早期に生
成する必要がある。Further, in the weather resistant steel, if the structure of the weather resistant rust is dense, it is easy to physically block the atmospheric corrosion environment,
It also reduces the elution of Fe ions, which is the fundamental cause of floating rust and flow rust. On the other hand, however, if there are cracks or pores in the weather-resistant rust, they serve as a supply path for water and oxygen, and the corrosion resistance of the weather-resistant rust decreases. Therefore, it is necessary to form a dense and continuous rust layer at an early stage.
【００１４】これらのことを前提として、以下、本発明
に用いられる各構成要素の作用について具体的に説明す
る。 （１）第１発明および第２発明について （１−１）アルミニウムイオンを含む水溶液の塗布 アルミニウムイオンを含む水溶液を鋼材の表面あるいは
鋼材の錆層に塗布すると、鋼材に形成される錆が緻密に
なるため、割れや細孔のさらに少ない構造となる。ま
た、錆中の割れや細孔にアルミニウムイオンを含む水溶
液が流入すると、錆中の割れや細孔を埋めて錆を緻密に
する。この効果を発揮するためには、乾燥質量で１．０
μｍ以上のアルミ付着量が必要である。Based on these things, the operation of each component used in the present invention will be specifically described below. (1) About 1st invention and 2nd invention (1-1) Application | coating of the aqueous solution containing an aluminum ion When the aqueous solution containing an aluminum ion is apply | coated to the surface of steel material or the rust layer of steel material, the rust formed in steel material becomes dense. Therefore, the structure has fewer cracks and pores. When an aqueous solution containing aluminum ions flows into the cracks and pores in the rust, the cracks and pores in the rust are filled and the rust is made dense. In order to exert this effect, the dry mass is 1.0
Aluminum adhesion amount of μm or more is required.
【００１５】アルミ付着量の上限は特に限定されない
が、アルミ付着量が乾燥質量で５００ｇ／ｍ2 を超える
と、水分乾燥後の鋼材表面にアルミ化合物が粉状に析出
し、上塗りの塗膜密着性を損なうことがあるので、アル
ミ付着量は５００ｇ／ｍ2 以下とするのが望ましい。ま
た、アルミ付着量が５００ｇ／ｍ2 を超えてもその効果
は飽和するので、施工性、経済性の観点からも５００ｇ
／ｍ2 以下であることが好ましい。The upper limit of the amount of aluminum adhered is not particularly limited, but if the amount of aluminum adhered exceeds 500 g / m 2 in dry mass, aluminum compounds will be precipitated in powder form on the surface of the steel material after moisture drying, and adhesion of the top coat film will occur. Since it may impair the properties, it is desirable that the amount of aluminum adhered is 500 g / m 2 or less. Further, even if the amount of aluminum adhered exceeds 500 g / m 2 , the effect is saturated, so from the viewpoint of workability and economical efficiency, 500 g
/ M 2 or less is preferable.
【００１６】アルミニウムイオンを含む水溶液として
は、たとえば０．１〜５質量％の硫酸アルミ水溶液を好
適に使用することができる。この場合、硫酸アルミ水溶
液が０．１質量％未満だと必要なアルミニウムイオンを
鋼材に付着させるのに、数回の塗布作業が必要となり、
作業性、経済性に劣る。また、硫酸アルミ中の硫酸根
は、初期段階において鋼表面を腐食するため、安定錆の
形成を促進させる働きがあるので、その意味からも硫酸
アルミを使用するのが望ましい。As the aqueous solution containing aluminum ions, for example, a 0.1 to 5 mass% aluminum sulfate aqueous solution can be preferably used. In this case, if the aqueous solution of aluminum sulfate is less than 0.1% by mass, several coating operations are required to attach necessary aluminum ions to the steel material,
Inferior in workability and economy. Further, the sulfate group in aluminum sulfate corrodes the steel surface in the initial stage, and therefore has a function of promoting the formation of stable rust, and therefore it is preferable to use aluminum sulfate in that sense as well.
【００１７】（１−２）Ｃｕ、Ｆｅ、Ｐ、Ｃｒ、Ｎｉイ
オンの添加 Ｃｕ、Ｆｅ、Ｐ、Ｃｒ、Ｎｉイオンの各イオンは、アル
ミニウムイオンと共存すると、（１−１）に示した硫酸
アルミ水溶液の塗布処理効果をより高め、錆と鋼の界面
構造を緻密にするとともに、錆粒子自体を緻密にする効
果を持つ。これらの効果を発揮するためには、Ｃｕ、Ｆ
ｅ、Ｐ、Ｃｒ、Ｎｉイオンのうちの１種あるいは２種以
上を０．１ｇ／ｍ2 以上表面に付着させる必要がある。
そして、それらのうちの２種以上のイオンを添加すると
さらにその効果が増すので、２種類以上のイオンを添加
することが望ましい。(1-2) Addition of Cu, Fe, P, Cr, and Ni ions When the Cu, Fe, P, Cr, and Ni ions coexist with aluminum ions, the sulfuric acid shown in (1-1) is used. It has the effect of further increasing the coating effect of the aluminum aqueous solution, making the interface structure between rust and steel dense, and making the rust particles themselves dense. In order to exert these effects, Cu, F
It is necessary to deposit one or more of e, P, Cr, and Ni ions on the surface of 0.1 g / m 2 or more.
And, if two or more of these ions are added, the effect is further enhanced, so it is desirable to add two or more ions.
【００１８】この水溶液処理において、さらにα−Ｆｅ
ＯＯＨの微粒子を添加しておき、鋼材表面または鋼材の
錆層に０．１〜５００ｇ／ｍ2 の範囲で付着させること
ができ、また好適である。α−ＦｅＯＯＨは、耐候性鋼
を長期暴露して形成される防食性の高い安定錆の主要構
成化合物であり、通常の大気腐食環境中で化学的に安定
であり、相変態や溶解が生じない。このα−ＦｅＯＯＨ
の添加は、これ自身がその後に形成される安定錆の構成
要素となるばかりでなく、結晶核として腐食により新た
に溶解してくるＦｅイオンがα−ＦｅＯＯＨに変化する
反応を促進することにより、安定錆の形成を助長するも
のである。ここで、α−ＦｅＯＯＨの付着量が０．１〜
５００ｇ／ｍ2 の範囲が好ましいのは、０．１ｇ／ｍ2
未満ではその効果が小さく、５００ｇ／ｍ2 を超える
と、鋼材表面にα−ＦｅＯＯＨが粉状に析出する結果、
上塗りの塗膜密着性を損なう場合があるからである。In this aqueous solution treatment, α-Fe is further added.
OOH fine particles can be added in advance and can be attached to the surface of the steel material or the rust layer of the steel material in the range of 0.1 to 500 g / m 2 , which is also preferable. α-FeOOH is a main constituent compound of stable rust with high corrosion resistance formed by long-term exposure of weathering steel, is chemically stable in normal atmospheric corrosion environment, and does not cause phase transformation or dissolution. . This α-FeOOH
Addition of itself not only becomes a constituent element of stable rust that is subsequently formed, but also promotes a reaction in which Fe ions newly dissolved by corrosion as crystal nuclei change to α-FeOOH, It promotes the formation of stable rust. Here, the adhesion amount of α-FeOOH is 0.1 to 0.1
The range of 500 g / m 2 is preferably 0.1 g / m 2
If less than 500 g / m 2 , the effect is small, and if it exceeds 500 g / m 2 , α-FeOOH precipitates in powder form on the surface of the steel,
This is because the adhesion of the top coat may be impaired.
【００１９】（１−３）有機樹脂被膜の効果 前記の硫酸アルミ水溶液による下塗り塗布に対して、有
機樹脂による上塗り被覆が行われる。この上塗り被覆に
より形成される有機樹脂被膜は、過度の水分や酸素を鋼
面に透過させて、下地鋼面での安定錆の生成または変態
反応を進行させるとともに、その間のＦｅイオンの滲み
出しを防止して、流れ錆を生じることなく安定錆生成を
完了させる機能を有する。また、上述した安定錆生成促
進化合物を鋼材表面に固定することにより、安定錆形成
を有効に行わせる働きを持つ。さらには、海塩粒子飛来
環境において、塩素イオンの透過による過度の腐食を防
止する働きもある。(1-3) Effect of Organic Resin Coating A topcoat coating with an organic resin is performed in addition to the undercoat coating with the aluminum sulfate aqueous solution. The organic resin film formed by this overcoating allows excess water and oxygen to permeate the steel surface, promotes stable rust formation or transformation reaction on the base steel surface, and prevents Fe ions from seeping out during that time. It has the function of preventing the formation of stable rust without causing flow rust. Further, by fixing the above-mentioned stable rust formation promoting compound on the surface of the steel material, it has a function of effectively performing stable rust formation. Further, it also has a function of preventing excessive corrosion due to permeation of chlorine ions in an environment in which sea salt particles fly.
【００２０】この上塗りの有機樹脂被膜は、乾燥膜厚で
５〜１５０μｍ、より好ましくは５〜５０μｍとされ
る。５μｍより薄い膜厚では、Ｆｅイオンや塩素イオン
の透過に対するバリアー効果が低く、下地鋼材の腐食で
生成されてくるＦｅイオンの滲み出しを完全に防ぐこと
ができず、流れ錆を生じてしまう。特に、海塩粒子飛来
環境においては、塩素イオンの透過が激しく、過度の腐
食を生じてしまい、連続した安定錆の生成が阻害されて
しまうため、有機樹脂被膜の膜厚を５μｍ以上とする必
要がある。The top coat organic resin film has a dry film thickness of 5 to 150 μm, more preferably 5 to 50 μm. When the film thickness is less than 5 μm, the barrier effect against the permeation of Fe ions and chlorine ions is low, the exudation of Fe ions generated by the corrosion of the base steel material cannot be completely prevented, and flow rust occurs. In particular, in an environment where sea salt particles come in, chlorine ions permeate violently, causing excessive corrosion, which hinders the formation of continuous stable rust. Therefore, it is necessary to set the thickness of the organic resin film to 5 μm or more. There is.
【００２１】一方、１５０μｍを超える膜厚とすると、
経済的に不利となるばかりでなく、錆層が形成されてい
ない下地に１５０μｍを超える被膜を形成すると、バリ
アー効果が高くなりすぎ、衝撃等なんらかの理由により
被膜が剥落すると、その部分から流れ錆を生じ、また安
定錆の形成が阻害される可能性があるため、有機樹脂被
膜の膜厚を１５０μｍ以下に限定した。On the other hand, if the film thickness exceeds 150 μm,
Not only is it economically disadvantageous, but when a coating of more than 150 μm is formed on the underlayer on which no rust layer is formed, the barrier effect becomes too high, and if the coating peels off for some reason such as impact, flow rust will flow from that portion. Since this may occur and the formation of stable rust may be hindered, the film thickness of the organic resin film is limited to 150 μm or less.
【００２２】ここで、本発明で使用される有機樹脂は、
特に限定されない。エポキシ樹脂、ウレタン樹脂、ビニ
ル樹脂、ポリエステル樹脂、アクリル樹脂、アルキド樹
脂、ブチラール樹脂、フタル酸樹脂等、あるいはこれら
の組合せまたは積層して用いることができる。また上記
樹脂を塗料化して塗装を行うが、溶剤系の塗料として
も、水性の塗料としても特に問題はない。ただし、フェ
ノール樹脂のように硬化に加熱を要するもの、ポリエチ
レン樹脂のように接着する時に加熱して溶融させる必要
がある樹脂は、施工性、経済性の点で好ましくない。Here, the organic resin used in the present invention is
There is no particular limitation. An epoxy resin, a urethane resin, a vinyl resin, a polyester resin, an acrylic resin, an alkyd resin, a butyral resin, a phthalic acid resin, or the like, or a combination or a laminate of these can be used. Although the above resin is used as a paint for coating, there is no particular problem as a solvent-based paint or an aqueous paint. However, resins that require heating for curing, such as phenolic resins, and resins that need to be heated and melted at the time of bonding, such as polyethylene resins, are not preferable in terms of workability and economy.
【００２３】また、有機樹脂中には、ベンガラ、二酸化
チタン、カーボンブラック、フタロシアニンブルー等の
着色顔料、タルク、シリカ、マイカ、硫酸バリウム、炭
酸カルシウム等の体質顔料、酸化クロム、クロム酸亜
鉛、クロム酸鉛、塩基性硫酸鉛等の防錆顔料、その他チ
キソ剤、分散剤、酸化防止剤等慣用の添加剤を含むこと
ができる。特に上塗りの有機樹脂被膜が将来的に損耗な
いしは剥落しても外観が損なわれないように、着色顔料
により安定錆と同色の茶色あるいはチョコレート色にし
ておくことが好ましい。In the organic resin, coloring pigments such as red iron oxide, titanium dioxide, carbon black and phthalocyanine blue, body pigments such as talc, silica, mica, barium sulfate and calcium carbonate, chromium oxide, zinc chromate and chromium. Antirust pigments such as lead acid and basic lead sulfate, and other conventional additives such as thixotropic agents, dispersants, and antioxidants may be included. In particular, it is preferable that the topcoat organic resin film is colored brown or chocolate, which is the same color as stable rust, by a coloring pigment so that the appearance is not damaged even if it is worn or peeled off in the future.
【００２４】以上、述べてきた下塗り処理液および上塗
り塗料のどらちも、通常の塗装方法と同じくエアスプレ
ー、エアレススプレーあるいは刷毛塗り等のいずれの方
法によっても塗布することができるため、場所を選ばず
施工が可能である。したがって、現地での鋼材の切断、
溶接等の加工後にも対応できる。また、下塗り、上塗り
の２回の塗布作業で効果があるため、経済的である。Any one of the above-mentioned undercoat treatment liquid and topcoat paint can be applied by any method such as air spray, airless spray or brush coating as in the usual coating method. It can be installed without using it. Therefore, on-site cutting of steel materials,
Can be used even after processing such as welding. In addition, it is economical because it is effective in two coating operations of undercoating and topcoating.
【００２５】本発明が対象とする鋼材は、耐候性鋼に限
らず、通常の大気腐食環境において、本発明に係る樹脂
被膜中の硫酸アルミニウムの作用により、最終的に化学
的に安定で緻密な耐候性錆に変態する錆を生成する鋼材
であれば良く、たとえば普通鋼、低合金鋼等も本発明の
対象の鋼材として挙げられる。The steel material to which the present invention is applied is not limited to weathering steel, but in a normal atmospheric corrosive environment, due to the action of aluminum sulfate in the resin coating according to the present invention, it is finally chemically stable and dense. Any steel material may be used as long as it is a steel material that produces rust that transforms into weather-resistant rust, and examples thereof include ordinary steel and low alloy steel.
【００２６】ただし、こうして生成された保護性の錆層
になんらかの外力が作用して亀裂の生成や剥落を生じた
とき、普通鋼等は、その損傷部において再度安定錆を生
成する自己修復性能に劣るため、耐候性鋼を使用するこ
とが望ましい。However, when some kind of external force acts on the protective rust layer generated in this way to cause the formation or cracking of cracks, ordinary steel or the like has a self-repairing ability of generating stable rust again at the damaged portion. Since it is inferior, it is desirable to use weathering steel.
【００２７】（２）第３発明および第４発明について （２−１）有機樹脂塗料の効果 本発明においては、硫酸アルミニウムまたは硫酸アルミ
ニウムとα−ＦｅＯＯＨが添加されている有機樹脂塗料
によって、鋼材表面に被膜が形成されているが、その乾
燥膜厚を５μｍ〜１５０μｍと限定したのは、５μｍよ
り薄い膜厚では、バリアー効果が低く、下地鋼材が腐食
されて生成される鉄イオンの滲み出しを完全に防ぐこと
ができず、流れ錆を生じてしまうからである。特に、海
塩粒子飛来環境においては、塩素イオンの透過が激し
く、過度の腐食を生じてしまい、連続した安定錆の生成
が阻害されてしまうため、膜厚を５μｍ以上とする必要
がある。(2) Third and Fourth Inventions (2-1) Effect of Organic Resin Paint In the present invention, the surface of steel material is coated with an organic resin paint containing aluminum sulfate or aluminum sulfate and α-FeOOH. The film thickness is limited to 5 μm to 150 μm, but the barrier effect is low when the film thickness is less than 5 μm, and the exudation of iron ions generated by corrosion of the base steel material is prevented. This is because it cannot be completely prevented and flow rust occurs. In particular, in the environment where sea salt particles fly, chlorine ions permeate violently, causing excessive corrosion, which hinders the production of continuous stable rust. Therefore, it is necessary to set the film thickness to 5 μm or more.
【００２８】一方、１５０μｍを超える膜厚とすると、
経済的に不利となるばかりでなく、錆層が形成されてい
ない下地に１５０μｍを超える被膜を形成すると、バリ
アー効果が高くなりすぎて、下地鋼面に安定錆を生成す
るのに長時間を要するようになる。安定錆が生成する以
前に、衝撃等なんらかの理由により被膜が剥落すると、
その部分から流れ錆が生じ、また安定錆の形成が阻害さ
れる可能性が高いため、膜厚を１５０μｍ以下として早
期に安定錆を生成させることが望ましい。On the other hand, if the film thickness exceeds 150 μm,
Not only is it economically disadvantageous, but when a coating of more than 150 μm is formed on a base without a rust layer, the barrier effect becomes too high and it takes a long time to generate stable rust on the base steel surface. Like If the film peels off for some reason such as impact before stable rust is generated,
Since it is highly likely that flow rust will occur from that portion and the formation of stable rust will be hindered, it is desirable to form stable rust at an early stage by setting the film thickness to 150 μm or less.
【００２９】すなわち、本発明の被膜は、適度の水分や
酸素を界面に透過させることにより、下地鋼面で安定錆
生成あるいは変態反応を進行させ、その間鉄イオンの滲
み出しを防止し、流れ錆を生じることなく安定錆生成を
完了させる働きをもつものである。That is, the coating film of the present invention allows a stable rust formation or transformation reaction to proceed on the surface of the base steel by allowing an appropriate amount of water and oxygen to permeate through the interface, while preventing the leaching of iron ions and preventing flow rust. It has the function of completing the stable rust formation without causing rust.
【００３０】ここで、本発明において使用される有機樹
脂塗料は特に限定されるものではなく、エポキシ樹脂、
ウレタン樹脂、ビニル樹脂、ポリエステル樹脂、アクリ
ル樹脂、アルキド樹脂、ブチラール樹脂、フタル酸樹脂
等を挙げることができる。またこれらの樹脂を塗料化し
て塗装を行うが、溶剤系の塗料としても、水性塗料とし
ても特に問題はない。ただし、フェノール樹脂（常温で
硬化するタイプのものを除く）のように硬化に加熱を必
要とするもの、あるいはポリエチレン樹脂のように接着
するときに加熱して溶融させる必要がある樹脂は施工
性、経済性の点で好ましくない。Here, the organic resin coating material used in the present invention is not particularly limited, and an epoxy resin,
Examples thereof include urethane resin, vinyl resin, polyester resin, acrylic resin, alkyd resin, butyral resin, and phthalic acid resin. Although these resins are used as paints for coating, there is no particular problem as solvent-based paints or water-based paints. However, if the resin requires heating to cure, such as phenol resin (excluding those that cure at room temperature), or the resin that needs to be heated and melted when bonding, such as polyethylene resin, It is not preferable in terms of economy.
【００３１】また、本発明における有機樹脂塗料中に
は、ベンガラ、二酸化チタン、カーボンブラック、フタ
ロシアニンブルー等の着色顔料、タルク、シリカ、マイ
カ、硫酸バリウム、炭酸カルシウム等の体質顔料、酸化
クロム、クロム酸亜鉛、クロム酸鉛、塩基性硫酸鉛等の
防錆顔料、その他チキソ剤、分散剤、酸化防止剤等慣用
の添加剤を含むことができる。特に上塗りの被膜が将来
部分的に損耗ないし剥落しても外観を損なわないよう
に、着色顔料により、安定錆と同色の茶色ないしチョコ
レート色にしておくことが好ましい。In the organic resin coating material of the present invention, coloring pigments such as red iron oxide, titanium dioxide, carbon black and phthalocyanine blue, body pigments such as talc, silica, mica, barium sulfate and calcium carbonate, chromium oxide and chromium. It may contain rust preventive pigments such as zinc acid salt, lead chromate and basic lead sulfate, and other conventional additives such as thixotropic agents, dispersants and antioxidants. In particular, it is preferable that the top coat is colored brown or chocolate with the same color as stable rust so that the appearance is not damaged even if the top coat is partially worn or peeled off in the future.
【００３２】これらのうち、防錆顔料は、腐食環境の非
常に激しい場所で使用するときに、防食性のコントロー
ルの意味で添加しても差し支えないが、添加する場合は
過度の防食性を与えないようにその添加量を１０質量％
以下にしておくことが望ましい。Of these, the rust preventive pigment may be added in the sense of anticorrosion control when used in a place where the corrosive environment is extremely severe, but when added, it gives an excessive anticorrosion property. 10% by mass so that it is not added
It is desirable to keep the following.
【００３３】また、有機樹脂塗料に硫酸鉄、硫酸ニッケ
ル、燐酸等を添加してもよく、むしろ好適である。鉄イ
オンやニッケルイオンあるいは燐酸は、アルミニウムイ
オンと共存することにより、α−ＦｅＯＯＨの生成を促
進させる効果を有するからである。Further, iron sulfate, nickel sulfate, phosphoric acid and the like may be added to the organic resin coating material, which is rather preferable. This is because iron ions, nickel ions, or phosphoric acid, when coexisting with aluminum ions, has the effect of promoting the production of α-FeOOH.
【００３４】なお、ここで述べた有機樹脂塗料中の添加
剤濃度は、乾燥固化した後の濃度で示している。被膜を
形成する前には、適当量の溶剤または水により塗装作業
に適した粘度に調整されていることは言うまでもないこ
とであり、溶剤または水分は、塗装後自然乾燥により蒸
散していく。The additive concentration in the organic resin coating material described here is the concentration after drying and solidification. Needless to say, the viscosity is adjusted with a suitable amount of solvent or water before forming the film, and the solvent or water evaporates by natural drying after coating.
【００３５】（２−２）硫酸アルミニウムの効果 有機樹脂塗料に添加されている硫酸アルミニウムは、被
膜中に水分が浸透してきたときに、アルミニウムイオン
と硫酸イオンになり、被膜と鋼の界面に到達する。それ
らのうちの硫酸イオンおよび水分は、鋼を腐食させて鉄
イオンを加速的に生成させる。一方アルミニウムイオン
は、この鉄イオンが安定錆の主成分であるα−ＦｅＯＯ
Ｈへ加速的に変態させるための触媒的な役割を果たして
いる。さらにアルミニウムイオンの一部は、α−ＦｅＯ
ＯＨの結晶粒に取り込まれ、その結晶を微細かつ緻密な
構造にすることによって、錆層の防食性能を向上させ
る。また、硫酸イオンも初期の鉄イオンの生成の加速の
みならず、安定錆層の微細化、緻密化に関与していると
考えられる。(2-2) Effect of Aluminum Sulfate Aluminum sulfate added to the organic resin paint becomes aluminum ions and sulfate ions when moisture penetrates into the coating film, and reaches the interface between the coating film and steel. To do. Sulfate ions and water among them corrode steel and produce iron ions in an accelerated manner. On the other hand, aluminum ions are α-FeOO, which is the main component of stable rust.
It plays a catalytic role for accelerating transformation into H. Furthermore, a part of aluminum ions is α-FeO.
The corrosion resistance of the rust layer is improved by being taken into the crystal grains of OH and making the crystals have a fine and dense structure. Further, it is considered that the sulfate ions are involved not only in the acceleration of the initial generation of iron ions but also in the miniaturization and densification of the stable rust layer.
【００３６】これらの効果を得るためには、乾燥質量で
１質量％以上の硫酸アルミニウムを必要とする。反対に
６５質量％を超える量を添加すると、これら無機物質を
結合する役割を持つ有機樹脂分が不足するため、被膜が
脆くなるとともに、被膜表面から鋼界面に到達する貫通
孔が形成されて、流れ錆が発生しやすくなるため、上限
を６５質量％とした。In order to obtain these effects, 1 mass% or more of aluminum sulfate in dry mass is required. On the other hand, when the amount exceeds 65% by mass, the organic resin component that has a role of binding these inorganic substances is insufficient, so that the coating becomes brittle and a through hole reaching the steel interface from the coating surface is formed, Since flow rust is likely to occur, the upper limit was made 65 mass%.
【００３７】（２−３）α−ＦｅＯＯＨ添加の効果 安定錆の主成分は、α−ＦｅＯＯＨで構成されており、
有機樹脂塗料中にα−ＦｅＯＯＨを１質量％以上添加す
ることにより、このα−ＦｅＯＯＨが結晶核となり、α
−ＦｅＯＯＨの生成が促進される。また有機樹脂塗料に
添加されたα−ＦｅＯＯＨの一部は被膜と鋼の界面で形
成される安定錆に取り込まれ、連続被膜形成を促進する
効果を持つ。さらには、α−ＦｅＯＯＨの添加は、被膜
の損耗や剥落後に現れる最終的な安定錆と樹脂被膜の色
調を同一にすることができるという効果も有する。上限
の添加量を６４質量％（硫酸アルミニウムとの合計量で
６５質量％）としたのは、６４質量％を超える量を添加
すると、これら無機物質を結合する役割を持つ有機樹脂
分が不足するため、被膜が脆くなるとともに被膜表面か
ら鋼表面に達する貫通孔が形成されて流れ錆が発生しや
すくなるからである。(2-3) Effect of Addition of α-FeOOH The main component of stable rust is α-FeOOH,
By adding 1% by mass or more of α-FeOOH to the organic resin paint, this α-FeOOH becomes a crystal nucleus,
-Production of FeOOH is promoted. Further, a part of α-FeOOH added to the organic resin coating material is taken into stable rust formed at the interface between the coating film and steel, and has the effect of promoting the formation of a continuous coating film. Furthermore, addition of α-FeOOH also has the effect that the color tone of the resin film can be made the same as the final stable rust that appears after the film is worn or peeled. The upper limit of the amount added is 64% by mass (65% by mass in total with aluminum sulfate), because the addition of an amount exceeding 64% by mass results in a shortage of the organic resin component having a role of binding these inorganic substances. Therefore, the coating becomes brittle and through holes are formed from the surface of the coating to the surface of the steel, and flow rust easily occurs.
【００３８】本発明にかかる鋼材に施される処理は、以
上述べてきた塗料を、通常の塗装方法と同じくエアスプ
レー、エアレススプレーあるいは刷毛塗り等のいずれの
方法によって塗装してもよいため、場所を選ばず施工が
可能である。また、１回の塗装作業で効果があるため経
済性にも優れる。さらに現地塗装が可能なため、現地で
の鋼材の切断、溶接等の加工後にも対応できる。The treatment applied to the steel material according to the present invention may be carried out by applying the above-mentioned coating material by any method such as air spraying, airless spraying or brush coating as in the ordinary coating method. Construction is possible regardless of. In addition, it is economical because it is effective in one coating operation. Furthermore, since it can be painted on-site, it can be used even after processing such as cutting and welding steel materials on-site.
【００３９】また、対象とする鋼材は、耐候性鋼に限ら
ず、通常の大気腐食環境において、本発明に係る樹脂被
膜中の硫酸アルミニウムの作用により、最終的に化学的
に安定で緻密な耐候性錆に変態する錆を生成する鋼材で
あれば良く、たとえば普通鋼、低合金鋼等も本発明の対
象の鋼材として挙げられる。Further, the target steel material is not limited to weathering steel, but in a normal atmospheric corrosive environment, due to the action of aluminum sulfate in the resin coating according to the present invention, finally chemically stable and dense weather resistance is obtained. Any steel material may be used as long as it is a material that produces rust that transforms into natural rust.
【００４０】ただし、こうして生成された保護性の錆層
になんらかの外力が作用して亀裂の生成や剥落を生じた
とき、普通鋼等は、その損傷部において再度安定錆を生
成する自己修復性能に劣るため、耐候性鋼を使用するこ
とが望ましい。However, when some kind of external force acts on the protective rust layer generated in this way to cause the formation or cracking of cracks, ordinary steel or the like has a self-repairing ability of generating stable rust again at the damaged portion. Since it is inferior, it is desirable to use weathering steel.
【００４１】[0041]
【実施例】以下、本発明の実験例を示し、この実験例に
基づいて本発明の効果および各構成要件の限定条件を詳
説する。 ＜実験例１＞本実験例に用いた試験鋼の化学成分を表１
に示す。また、本処理を行う前の鋼材の前処理を表２に
示し、下塗り処理液の組成と上塗り塗料組成をそれぞれ
表３および表４に示す。試験片の寸法は、１５０×７×
３．２mmとし、処理前の試験片の表面はエメリー紙研磨
およびバフ研磨により鏡面となっている。なお、上塗り
塗料組成中の硬化剤は、エポキシ樹脂についてはアミン
系硬化剤、ウレタン樹脂についてはイソシアネート系硬
化剤、顔料はベンガラ５．０質量％カーボンブラック
１．３質量％、シリカ１４．７質量％として合計で上塗
り塗料中にいずれも２０．０質量％となるように添加し
た。EXAMPLE An experimental example of the present invention will be shown below, and the effect of the present invention and the limiting conditions of each constituent element will be described in detail based on the experimental example. <Experimental example 1> Table 1 shows the chemical composition of the test steel used in this experimental example.
Shown in Table 2 shows the pretreatment of the steel material before this treatment, and Tables 3 and 4 show the composition of the undercoat treatment liquid and the composition of the top coat, respectively. The size of the test piece is 150 × 7 ×
The surface of the test piece before treatment is 3.2 mm, and the surface is mirror-finished by polishing emery paper and buffing. In addition, the curing agent in the top coating composition is an amine curing agent for epoxy resin, an isocyanate curing agent for urethane resin, and a pigment is 5.0% by mass red iron oxide (1.3% by mass) carbon black (14.7% by mass). %, So that the total amount was 20.0% by mass in the topcoat paint.
【００４２】[0042]
【表１】 [Table 1]
【００４３】[0043]
【表２】 [Table 2]
【００４４】[0044]
【表３】 [Table 3]
【００４５】[0045]
【表４】 [Table 4]
【００４６】下塗り処理液はエアスプレー塗装により、
また上塗り塗料はエアレススプレー塗装により塗布し、
サンプル試験片を作製した。このサンプル試験片を同一
条件のもとに、海岸より１０ｍの位置にある兵庫県尼崎
市の工業地帯に１年間暴露し、その間経時的に流れ錆発
生の有無を評価した。また、暴露後のサンプルについて
偏光顕微鏡による断面観察により安定錆生成の有無（安
定錆が生成した部分は消光する）を確認し、画像解析処
理により全錆中に対する安定錆量を百分率で求めた。本
発明例のサンプル片の作成条件および試験結果を表５、
表６に、比較例のサンプル片の作成条件および試験結果
を表７に示す。The undercoat treatment liquid is formed by air spray coating.
Also, the top coat paint is applied by airless spray painting,
A sample test piece was prepared. Under the same conditions, this sample test piece was exposed to an industrial area in Amagasaki City, Hyogo Prefecture, located 10 m from the coast for one year, and during that time, the presence or absence of flow rust was evaluated. Moreover, the presence or absence of stable rust formation (the part where stable rust was generated disappeared) was confirmed by observing the cross-section of the exposed sample with a polarizing microscope, and the stable rust amount relative to the total rust was obtained as a percentage by image analysis processing. Table 5 shows the preparation conditions and test results of the sample piece of the present invention.
Table 6 shows the preparation conditions and test results of the sample piece of the comparative example.
【００４７】[0047]
【表５】 [Table 5]
【００４８】[0048]
【表６】 [Table 6]
【００４９】[0049]
【表７】 [Table 7]
【００５０】表５、表６に示される本発明例、および表
７に示される比較例の結果を見てみると、本発明例であ
る試験番号１〜３４では、流れ錆の発生は認められず、
下地鋼面部分に安定錆が高い割合で生成しているのが認
められた。特に試験番号３〜９のように、アルミイオン
以外のイオンが添加されているものは、イオンの相乗効
果により安定錆の生成比率が高く、その促進効果が顕著
であった。また安定錆生成率が４５％を超えるものは、
概ね安定錆が連続被膜として生成しているのに対し、安
定錆生成率が４５％以下のものは不連続被膜になる傾向
を示しており、防食効果に劣ることが判った。When the results of the examples of the present invention shown in Tables 5 and 6 and the comparative examples shown in Table 7 are examined, in the test numbers 1 to 34 which are the examples of the present invention, occurrence of flow rust was recognized. No
It was confirmed that stable rust was generated in a high proportion on the base steel surface part. In particular, as in Test Nos. 3 to 9, in which ions other than aluminum ions were added, the generation ratio of stable rust was high due to the synergistic effect of the ions, and its promoting effect was remarkable. If the stable rust generation rate exceeds 45%,
In general, stable rust was formed as a continuous film, whereas those with a stable rust formation rate of 45% or less tended to be a discontinuous film, and it was found that the anticorrosion effect was poor.
【００５１】一方、比較例である試験番号３５〜４１に
おいては、下塗り処理で付着させるアルミの量が１ｇ／
ｍ2 未満であったり、上塗り有機樹脂塗料の膜厚が５〜
１５０μｍの範囲外のときは流れ錆を生じたり、安定錆
の生成が不十分になったりするために、流れ錆を生じる
ことなく早期に安定錆を生成させるという本発明の目的
を達成することができないものであることが判った。On the other hand, in test numbers 35 to 41, which are comparative examples, the amount of aluminum deposited in the undercoating treatment was 1 g /
less than m 2 , or the thickness of the top organic resin paint is 5
When it is out of the range of 150 μm, flow rust is generated, or stable rust is insufficiently generated. Therefore, it is possible to achieve the object of the present invention to generate stable rust early without flow rust. It turned out to be impossible.
【００５２】また、１年間暴露した後の試験番号８、２
５の各サンプル片に、ナイフにより鉄素地に達する傷を
入れ、さらに３か月間暴露を継続した。その結果、試験
番号２５の傷部から非常に多くの流れ錆の発生が認めら
れたが、試験番号８の傷部からは少量の流れ錆しか認め
られなかった。これにより、安定錆生成に関し耐候性鋼
の方が普通鋼よりも優れた自己修復機能を有することが
判った。Test numbers 8 and 2 after exposure for 1 year
Each sample piece of 5 was scratched with a knife to reach the iron substrate, and the exposure was continued for another 3 months. As a result, an extremely large amount of flow rust was observed from the scratches of test number 25, but only a small amount of flow rust was observed from the scratches of test number 8. From this, it was found that weathering steel has a better self-repairing function than ordinary steel in terms of stable rust formation.
【００５３】＜実験例２＞本実験例に用いた試験鋼の化
学成分を表８に、また鋼材の前処理を表９に示し、被覆
材に用いる基材樹脂を表１０に示す。試験片の寸法は、
１５０×７０×３．２mmとし、処理前の鋼材表面には、
ショットブラストによる除錆を施した。Experimental Example 2 The chemical composition of the test steel used in this experimental example is shown in Table 8, the pretreatment of the steel material is shown in Table 9, and the base resin used for the coating material is shown in Table 10. The size of the test piece is
150 × 70 × 3.2mm, the steel surface before treatment,
Rust removal was performed by shot blasting.
【００５４】[0054]
【表８】 [Table 8]
【００５５】[0055]
【表９】 [Table 9]
【００５６】[0056]
【表１０】 [Table 10]
【００５７】被覆材として用いる樹脂のうち硬化剤を使
用するタイプには、２液タイプで主剤（基材樹脂＋添加
剤）と硬化剤を塗装直前に混合した。Among the resins used as the coating material, the type using a curing agent was a two-component type in which the main agent (base resin + additive) and the curing agent were mixed immediately before coating.
【００５８】表１１および表１２に本発明例のサンプル
の作成条件および試験結果を、表１２に比較例のサンプ
ルの作成条件および試験結果をそれぞれ示す。表１１お
よび表１２に示す樹脂、添加材配合組成に適当量の溶剤
を加えて粘度（Ｂ型粘度計測定）を２００〜１０００Ｃ
ＰＳにした塗料を作製し、これらの塗料をエアスプレー
塗装により試験鋼に塗布し、試験鋼を被覆してサンプル
試験片を作製した。このサンプル試験片を同一条件のも
とに、海岸より１０ｍの位置にある兵庫県尼崎市の工業
地帯に１年間暴露し、その間経時的に流れ錆発生の有無
を評価した。また暴露後のサンプルについて偏光顕微鏡
による断面観察により安定錆生成有無を確認し、画像解
析処理により全錆中に対する安定錆量を百分率で求め
た。なお、比較例のうちの試験番号８３、８４において
は、２層被覆を施している。Tables 11 and 12 show the preparation conditions and test results of the sample of the present invention, and Table 12 shows the preparation conditions and test results of the sample of the comparative example. An appropriate amount of solvent was added to the resin and additive composition shown in Table 11 and Table 12 to adjust the viscosity (measured by a B-type viscometer) to 200 to 1000C.
Paints made into PS were prepared, these paints were applied to test steel by air spray coating, and the test steel was coated to prepare sample test pieces. Under the same conditions, this sample test piece was exposed to an industrial area in Amagasaki City, Hyogo Prefecture, located 10 m from the coast for one year, and during that time, the presence or absence of flow rust was evaluated. In addition, the presence or absence of stable rust formation was confirmed by observing the cross section of the exposed sample with a polarizing microscope, and the stable rust amount relative to the total rust was obtained as a percentage by image analysis processing. In addition, in the test numbers 83 and 84 of the comparative example, two-layer coating is applied.
【００５９】[0059]
【表１１】 [Table 11]
【００６０】[0060]
【表１２】 [Table 12]
【００６１】表１１および表１２から判るように、本発
明例である試験番号５１〜７３においては、流れ錆の発
生が認められず、しかも下地鋼面部分に安定錆が高い割
合で生成しているのが認められた。特に硫酸アルミニウ
ムを単独で用いたものに比べ、α−ＦｅＯＯＨや硫酸ク
ロム等を併用したものは、その相乗効果により安定錆の
生成比率が高く、安定錆生成に対する促進効果が顕著で
あった。また、安定錆生成率が４５％を超えるものは概
ね安定錆が連続被膜として生成しているのに対し、４０
％以下のものは不連続被膜になる傾向を示しており、防
食効果に劣ることが予想される。As can be seen from Tables 11 and 12, in Test Nos. 51 to 73, which are examples of the present invention, no flow rust was observed and stable rust was generated at a high ratio on the base steel surface. Was found to exist. In particular, as compared with the case of using aluminum sulfate alone, the case of using α-FeOOH, chromium sulfate or the like in combination has a high ratio of stable rust generation due to the synergistic effect, and the effect of promoting stable rust generation is remarkable. In addition, in the case where the stable rust formation rate exceeds 45%, stable rust is generally formed as a continuous film, whereas
% Or less shows a tendency to form a discontinuous coating, and it is expected that the anticorrosion effect is inferior.
【００６２】一方、表１２から判るように、比較例であ
る７４〜８４においては、硫酸アルミニウムの添加量が
適性範囲外のもの、あるいは膜厚が５〜１５０μｍの範
囲外のものは、流れ錆を生じたり、安定錆の生成が不十
分になったりするために、流れ錆を生じることなく安定
錆を早期に生成させるという本発明の目的は達成できな
かった。On the other hand, as can be seen from Table 12, in the comparative examples 74 to 84, if the addition amount of aluminum sulfate is out of the appropriate range, or if the film thickness is out of the range of 5 to 150 μm, flow rust occurs. Therefore, the object of the present invention that the stable rust is generated at an early stage without generating the flow rust cannot be achieved because of the generation of the rust and the insufficient generation of the stable rust.
【００６３】また、１年間暴露した試験番号５９および
６８の各サンプル試験片に、ナイフにより鉄素地に達す
る傷を入れ、さらに３か月間暴露を継続した。その結
果、サンプル６８の傷部からは、大量の流れ錆の発生が
認められたが、サンプル５９の傷部からは、少量の流れ
錆しか認められなかった。これは耐候性鋼が、安定錆生
成に関し、自己修復能力を有するためと考えられる。Further, each sample test piece of Test Nos. 59 and 68 exposed for 1 year was scratched with a knife to reach the iron substrate, and the exposure was continued for another 3 months. As a result, a large amount of flow rust was observed from the scratches of Sample 68, but only a small amount of flow rust was observed from the scratches of Sample 59. It is considered that this is because the weathering steel has a self-repairing ability for stable rust formation.
【００６４】[0064]
【発明の効果】以上の通り、本発明によれば、簡単な処
理により、赤錆や黄錆等の浮き錆や流れ錆をほとんど生
じることなく、大気腐食環境に対して安定した耐候性錆
を生成すること、および耐候性錆が早期に育成される鋼
材を提供することが可能となる。As described above, according to the present invention, by simple treatment, floating rust such as red rust or yellow rust or flow rust is hardly generated, and stable weather-resistant rust is generated in an atmospheric corrosive environment. By doing so, it is possible to provide a steel material in which weather-resistant rust is grown at an early stage.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 幸 英昭 大阪市中央区北浜４丁目５番33号 住友金 属工業株式会社内 (72)発明者 神田 三 東京都江東区新木場４丁目12番12号 神東 塗料株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Sachi 4-533 Kitahama, Chuo-ku, Osaka City Sumitomo Metal Industries, Ltd. (72) Inventor San Kanda 4-12-12 Shinkiba, Koto-ku, Tokyo Shinto Paint Co., Ltd.
Claims (4)
付着量が乾燥質量で１．０ｇ／ｍ2 以上となるように、
アルミニウムイオンを含む水溶液を塗布し、水分乾燥
後、その上層に、乾燥膜厚が５μｍ以上１５０μｍ以下
である有機樹脂被膜を形成することを特徴とする耐候性
に優れた鋼材の表面処理方法。1. A surface of steel material or a rust layer of steel material, wherein the amount of aluminum adhered is 1.0 g / m 2 or more in dry mass.
A surface treatment method for a steel material having excellent weather resistance, which comprises applying an aqueous solution containing aluminum ions, drying the water, and then forming an organic resin film having a dry film thickness of 5 μm or more and 150 μm or less on the upper layer thereof.
付着量が乾燥質量で１．０ｇ／ｍ2 以上、Ｃｕ、Ｆｅ、
Ｐ、Ｃｒ、Ｎｉイオンのうちの１種あるいは２種以上の
イオンの総付着量が、０．１ｇ／ｍ2 以上となるよう
に、アルミニウムイオンと、Ｃｕ、Ｆｅ、Ｐ、Ｃｒ、Ｎ
ｉイオンのうちの１種あるいは２種以上のイオンを含ん
だ水溶液を塗布し、水分乾燥後、その上層に、乾燥膜厚
が５μｍ以上１５０μｍ以下である有機樹脂被膜を形成
することを特徴とする耐候性に優れた鋼材の表面処理方
法。2. The amount of aluminum deposited on the surface of a steel material or the rust layer of a steel material is 1.0 g / m 2 or more in terms of dry mass, Cu, Fe,
Aluminum ions and Cu, Fe, P, Cr, N so that the total deposition amount of one or more of P, Cr, and Ni ions is 0.1 g / m 2 or more.
An aqueous solution containing one or more of i ions is applied, dried with water, and then an organic resin film having a dry film thickness of 5 μm or more and 150 μm or less is formed thereon. Surface treatment method for steel materials with excellent weather resistance.
ルミニウムを乾燥質量で１〜６５質量％含む有機樹脂塗
料によって、乾燥膜厚が５μｍ以上１５０μｍ以下であ
る被膜が形成されていることを特徴とする耐候性に優れ
た鋼材。3. A coating film having a dry film thickness of 5 μm or more and 150 μm or less is formed on the surface of the steel material or the rust layer of the steel material by an organic resin paint containing 1 to 65 mass% of aluminum sulfate in a dry mass. A steel material with excellent weather resistance.
ルミニウムを乾燥質量で１〜６４質量％、α−ＦｅＯＯ
Ｈを乾燥質量で１〜６４質量％、その合計量を乾燥質量
で６５質量％以下含む有機樹脂塗料によって、乾燥膜厚
が５μｍ以上１５０μｍ以下である被膜が形成されてい
ることを特徴とする耐候性に優れた鋼材。4. Aluminum sulfate on the surface of the steel material or on the rust layer of the steel material in a dry mass of 1 to 64 mass%, α-FeOO
A weather resistance characterized in that a coating film having a dry film thickness of 5 μm or more and 150 μm or less is formed by an organic resin coating material containing H in a dry mass of 1 to 64% by mass and a total amount thereof in a dry mass of 65% by mass or less. Steel material with excellent properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14502094A JP2850097B2 (en) | 1994-06-27 | 1994-06-27 | Steel material excellent in weather resistance and surface treatment method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14502094A JP2850097B2 (en) | 1994-06-27 | 1994-06-27 | Steel material excellent in weather resistance and surface treatment method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0813158A true JPH0813158A (en) | 1996-01-16 |
| JP2850097B2 JP2850097B2 (en) | 1999-01-27 |
Family
ID=15375580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14502094A Expired - Lifetime JP2850097B2 (en) | 1994-06-27 | 1994-06-27 | Steel material excellent in weather resistance and surface treatment method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2850097B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6068712A (en) * | 1998-01-08 | 2000-05-30 | Kawasaki Steel Corporation | Steel products having superior weathering, method of producing the steel products, and method of forming weathering protective rust on steel product surfaces |
| KR100482209B1 (en) * | 2000-11-18 | 2005-04-13 | 주식회사 포스코 | Coating Paint For Coated Steel With Superior Corrosion Resistance And Method For Manufacturing Coated Steel Using The Coating Paint |
| JP2006283171A (en) * | 2005-04-04 | 2006-10-19 | Sumitomo Metal Ind Ltd | Surface treated steel having excellent weatherability in chloride environment |
| JP2006316139A (en) * | 2005-05-11 | 2006-11-24 | Sumitomo Metal Ind Ltd | Steel material for structure excellent in weather resistance in seashore and surface treating agent |
| JP2006315238A (en) * | 2005-05-11 | 2006-11-24 | Sumitomo Metal Ind Ltd | Weatherable structural steel material excellent in long-period durability in high flying chloride environment |
| JP2007230088A (en) * | 2006-03-01 | 2007-09-13 | Sumitomo Metal Ind Ltd | Resin-coated steel excellent in long-term durability in environment high in chloride concentration and method for producing the steel |
| JP2007302970A (en) * | 2006-05-12 | 2007-11-22 | Nhk Spring Co Ltd | Steel material with film having excellent corrosion resistance and corrosion fatigue resistance, and its production method |
-
1994
- 1994-06-27 JP JP14502094A patent/JP2850097B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6068712A (en) * | 1998-01-08 | 2000-05-30 | Kawasaki Steel Corporation | Steel products having superior weathering, method of producing the steel products, and method of forming weathering protective rust on steel product surfaces |
| KR100482209B1 (en) * | 2000-11-18 | 2005-04-13 | 주식회사 포스코 | Coating Paint For Coated Steel With Superior Corrosion Resistance And Method For Manufacturing Coated Steel Using The Coating Paint |
| JP2006283171A (en) * | 2005-04-04 | 2006-10-19 | Sumitomo Metal Ind Ltd | Surface treated steel having excellent weatherability in chloride environment |
| JP2006316139A (en) * | 2005-05-11 | 2006-11-24 | Sumitomo Metal Ind Ltd | Steel material for structure excellent in weather resistance in seashore and surface treating agent |
| JP2006315238A (en) * | 2005-05-11 | 2006-11-24 | Sumitomo Metal Ind Ltd | Weatherable structural steel material excellent in long-period durability in high flying chloride environment |
| JP2007230088A (en) * | 2006-03-01 | 2007-09-13 | Sumitomo Metal Ind Ltd | Resin-coated steel excellent in long-term durability in environment high in chloride concentration and method for producing the steel |
| JP4577238B2 (en) * | 2006-03-01 | 2010-11-10 | 住友金属工業株式会社 | Resin-coated steel with excellent long-term durability in concentrated chloride environments and its manufacturing method |
| JP2007302970A (en) * | 2006-05-12 | 2007-11-22 | Nhk Spring Co Ltd | Steel material with film having excellent corrosion resistance and corrosion fatigue resistance, and its production method |
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| Publication number | Publication date |
|---|---|
| JP2850097B2 (en) | 1999-01-27 |
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