JP2012149109A - Anticorrosive coating material and coated steel stock - Google Patents
Anticorrosive coating material and coated steel stock Download PDFInfo
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本発明は、防錆用塗料および塗装鋼材に係り、目視観察によって塗膜下における鋼材の腐食（発錆）を簡便に早期発見し、鋼材の腐食初期段階で塗膜の塗り替え塗装を施すことで、鋼材の防錆寿命を長期化し得る防錆用塗料、および該防錆用塗料を用いて表面に塗膜が形成された、塗装鋼材に関する。 The present invention relates to a rust-preventing paint and a coated steel material. By visually observing corrosion (rusting) of a steel material under a coating film easily and early, it is possible to repaint the coating film at an early stage of corrosion of the steel material. The present invention relates to a rust preventive paint capable of extending the rust preventive life of a steel material, and a coated steel material having a coating film formed on the surface using the rust preventive paint.
橋梁、杭、矢板等、長期に亘り自然環境に晒される鋼構造物では、腐食による特性劣化が常に問題とされている。例えば、鋼構造物の腐食が進行すると鋼材の肉厚が減少し、構造物としての所望の強度が維持できなくなる。そのため、これらの鋼構造物の素材となる鋼材には通常、防食被覆処理が施されている。防食被覆処理の代表的なものとしては、例えば、塗装、めっき、樹脂ライニング等が挙げられる。そして、これらの中でも特に、鋼材表面を塗膜で被覆することにより防錆する塗装は、低コストで施工性が良好であることから防錆用塗装として土木・建築用鋼材の防食（防錆）に広く用いられている。 In steel structures such as bridges, piles, and sheet piles that are exposed to the natural environment for a long period of time, deterioration of properties due to corrosion is always a problem. For example, when the corrosion of the steel structure proceeds, the thickness of the steel material decreases, and the desired strength as the structure cannot be maintained. Therefore, the steel material used as the material of these steel structures is usually subjected to a corrosion-proof coating treatment. Typical examples of the anticorrosion coating treatment include painting, plating, resin lining, and the like. Among these, especially, the coating that prevents rust by coating the steel surface with a coating film is low in cost and has good workability. Therefore, the corrosion protection (rust prevention) of steel for civil engineering and construction as a coating for rust prevention. Widely used in
鋼材表面に塗膜を形成した塗装鋼材は、優れた防食性（防錆性）を示すものの、塗膜端部や塗膜欠陥部から水分等が浸透するため、鋼材の腐食を完全に防止することはできない。そのため、塗装鋼材を素材として用いた鋼構造物では、鋼材表面に形成された塗膜を定期的に塗り替える作業が必要とされている。 Painted steel with a coating on the surface of the steel shows excellent corrosion resistance (rust prevention), but moisture penetrates from the edges of the coating and defects in the coating, thus completely preventing corrosion of the steel. It is not possible. Therefore, in a steel structure using a coated steel material as a raw material, an operation of periodically repainting a coating film formed on the steel material surface is required.
ここで重要となるのは、塗膜の塗り替え作業を行う時期の選定である。鋼材の腐食が進行すると塗膜の劣化を招き、更に腐食が進行すると鋼材表面から塗膜が剥離する。そして、ひとたび塗膜が剥離すると、鋼材の腐食が激しくなり、肉厚が減少して強度が著しく低下する等、鋼材の諸特性が大幅に劣化して様々な支障をきたす。特に、強度が要求される鋼構造物の場合、腐食により鋼材の肉厚が大幅に減少すると、鋼構造物に要求される強度を維持することができなくなるため、構造物としての安全性・信頼性を揺るがす結果となり兼ねない。また、鋼材の腐食や塗膜の劣化が大幅に進行した段階で塗り替えを行う場合には、その作業が大掛かりとなり、メンテナンスコストの高騰を招く。 What is important here is the selection of the timing for repainting the coating film. When the corrosion of the steel material proceeds, the coating film deteriorates, and when the corrosion further proceeds, the coating film peels off from the steel material surface. Once the coating film is peeled off, the steel material becomes severely corroded, the thickness is reduced, and the strength is remarkably lowered. As a result, various properties of the steel material are greatly deteriorated, causing various troubles. In particular, in the case of a steel structure that requires strength, if the thickness of the steel material is significantly reduced due to corrosion, the strength required for the steel structure cannot be maintained. It can be the result of shaking the sex. In addition, when repainting is performed at a stage where the corrosion of the steel material or the deterioration of the coating film has progressed significantly, the work becomes large and the maintenance cost increases.
以上の理由により、塗膜の塗り替えは、塗膜の劣化や剥離・欠落が発生する前の段階、すなわち鋼材の腐食（錆発生）初期段階で行うことが望ましい。このような早期の段階で塗膜の塗り替えを行えば、鋼材の防錆寿命を延長することが可能となり、延いては鋼構造物の安全性・信頼性を長期間に亘り維持することが可能となる。また、鋼材の腐食（錆発生）初期段階で塗膜の塗り替えを行えば、軽度の塗り替え補修作業で済むため、メンテナンスコスト面でも有利である。 For the above reasons, it is desirable to repaint the coating film at a stage before the coating film is deteriorated or peeled / missed, that is, at the initial stage of corrosion (rust generation) of the steel material. If the paint film is repainted at such an early stage, it will be possible to extend the rust prevention life of the steel material, and to maintain the safety and reliability of the steel structure over a long period of time. It becomes. In addition, if the paint film is repainted at the initial stage of corrosion (rust generation) of the steel material, a light repainting repair work is sufficient, which is advantageous in terms of maintenance cost.
塗装鋼材において鋼材表面に形成される塗膜は、特許文献１に記載されているように樹脂と顔料を含有する塗膜とするのが一般的である。また、塗装鋼材からなる鋼構造物の場合、塗膜の塗り替え時期は、例えば非特許文献１に記載されているように、塗膜外観を調査し、塗膜の状態を標準写真等と対比して、錆、剥がれ、変退色、汚れ、割れ・膨れ等について、４段階（健全、ほぼ健全、劣化している、劣化が著しい）に評価し、これらの評価に基づき決定している。
また、このような塗膜外観は目視観察によって行われる場合が多いが、例えば特許文献２に記載されているように、目視に加えて画像処理解析や塗膜の化学分析、塗膜下腐食測定等を行う場合もある。
As described in Patent Document 1, a coating film formed on the surface of a steel material in a coated steel material is generally a coating film containing a resin and a pigment. In the case of a steel structure made of coated steel, the coating film is repainted by examining the appearance of the coating film as described in Non-Patent Document 1, for example, and comparing the state of the coating film with a standard photograph or the like. Rust, peeling, discoloration, dirt, cracking, swelling, etc. are evaluated in four stages (sound, almost sound, deteriorated, severely deteriorated), and determined based on these evaluations.
In addition, the appearance of such a coating film is often performed by visual observation. For example, as described in Patent Document 2, in addition to visual observation, image processing analysis, chemical analysis of the coating film, and under-corrosion measurement Etc. may be performed.
しかしながら、塗装鋼材の鋼材表面に形成される一般的な塗膜、すなわち特許文献１に記載されたような樹脂と顔料を含む塗膜は透明でないため、塗膜下における鋼材の腐食（錆）の発生・進行状況を目視で確認することは極めて困難である。なお、塗膜下における鋼材の腐食（錆）が発生・進行すると、塗膜の膨れや塗膜欠陥部からの流れ錆びが確認され、腐食（錆）が著しくなると塗膜が剥離する。そのため、塗膜の状態を目視観察することで塗膜下における鋼材の腐食状況を確認し得るが、鋼構造物の形状が複雑である場合や塗膜の色合いによっては、目視の判定が困難なケースがあり、鋼材の腐食が著しく進展するまで鋼材の腐食（錆発生）や塗膜劣化・剥離を発見することができない場合があった。また、塗膜の膨れや塗膜欠陥部からの流れ錆び、或いは塗膜の剥離を確認することによって鋼材の腐食（錆発生）を認識することができたとしても、塗膜の膨れ等が生じた段階では塗膜下の鋼材の腐食（錆発生）はかなり進行している。以上のように、従来の塗膜では、塗膜下で発生する鋼材の腐食（錆）発生を早期に発見することができない。 However, since a general coating film formed on the steel surface of the coated steel material, that is, a coating film containing a resin and a pigment as described in Patent Document 1, is not transparent, corrosion (rust) of the steel material under the coating film It is extremely difficult to visually check the occurrence and progress. In addition, when corrosion (rust) of the steel material under the coating film occurs and progresses, swelling of the coating film and flow rust from the defective part of the coating film are confirmed, and when corrosion (rust) becomes remarkable, the coating film peels off. Therefore, the state of corrosion of the steel material under the coating film can be confirmed by visually observing the state of the coating film, but it is difficult to make a visual judgment depending on the shape of the steel structure or the color of the coating film. In some cases, corrosion of the steel material (rust generation), deterioration of the coating film, and delamination could not be detected until the corrosion of the steel material significantly progressed. In addition, even if the corrosion of the steel material (rust generation) can be recognized by confirming the swelling of the coating film, the flow rust from the defective part of the coating film, or the peeling of the coating film, the swelling of the coating film occurs. At this stage, corrosion (rust generation) of the steel material under the coating film has progressed considerably. As described above, in the conventional coating film, the occurrence of corrosion (rust) of the steel material occurring under the coating film cannot be detected at an early stage.
一方、特許文献２では、塗膜下腐食測定や塗膜の化学分析を行う技術について提案されており、この技術によると塗膜下における鋼材の腐食（錆）の発生を早期に確認し得る。しかしながら、鋼構造物は通常、大型構造物であるため、構造物全体について上記の如き腐食測定・化学分析を行うには多大な労力と時間を要する。また、メンテナンスコストも嵩む。 On the other hand, Patent Document 2 proposes a technique for measuring corrosion under a coating film and chemical analysis of the coating film. According to this technique, occurrence of corrosion (rust) of a steel material under the coating film can be confirmed at an early stage. However, since a steel structure is usually a large structure, it takes a lot of labor and time to perform the above-described corrosion measurement and chemical analysis on the entire structure. In addition, maintenance costs increase.
以上のように、鋼構造物において塗膜の塗り替え時期を決定するに際し、塗膜下腐食測定や塗膜の化学分析を行うことにより塗膜下の鋼材の腐食（錆発生）状況を確認する従来技術では、作業が煩雑になるうえ、コスト面でも不利になる。そのため、塗膜下の鋼材の腐食（錆発生）状況を目視観察により確認することができれば、極めて簡便に塗膜の塗り替え時期を決定することができる。しかし、従来の塗膜では、塗膜下で発生する鋼材の腐食（錆）発生を、目視観察によって早期に発見することができない。 As described above, when deciding when to repaint a coating on a steel structure, the corrosion (rust generation) status of the steel under the coating is confirmed by measuring the corrosion under the coating and chemical analysis of the coating. With technology, the work is complicated and the cost is disadvantageous. Therefore, if the corrosion (rust generation) state of the steel material under the coating film can be confirmed by visual observation, it is possible to determine the repainting time of the coating film very simply. However, in the conventional coating film, the occurrence of corrosion (rust) of the steel material occurring under the coating film cannot be detected early by visual observation.
本発明は、上記した従来技術が抱える問題を有利に解決するものであり、目視観察によって塗膜下における鋼材の腐食（発錆）を簡便に早期発見し、鋼材の腐食初期段階で塗膜の塗り替え塗装を施すことで、鋼材の防錆寿命を長期化し得る防錆用塗料、および該防錆用塗料を用いて表面に塗膜が形成された、鋼構造物の素材に好適な塗装鋼材を提供することを目的とする。 The present invention advantageously solves the above-described problems of the prior art. By visual observation, corrosion (rusting) of the steel material under the coating film is easily detected at an early stage, and the coating film is detected at the initial stage of corrosion of the steel material. By applying repainting, a rust-preventing paint that can prolong the rust-preventing life of the steel material, and a coated steel material suitable for steel structure materials with a coating film formed on the surface using the rust-preventing paint The purpose is to provide.
上記課題を解決すべく、本発明者らは、特許文献１に記載の如き塗膜、すなわち樹脂と顔料を含む塗膜を具えた塗装鋼材について、塗膜下における鋼材の腐食（錆発生）状態を目視により確認する手段について鋭意検討した。
まず、本発明者らは、塗膜の膨れや剥離によらず、目視によって塗膜下の鋼材の腐食（発錆）状態を確認し得る手段について検討した。そして、鋼材の腐食に伴い鉄イオンが生じることに着目し、鉄イオンと反応することで発色する物質を用いることに思い至った。
In order to solve the above-mentioned problems, the present inventors have developed a coating film as described in Patent Document 1, that is, a coated steel material including a coating film containing a resin and a pigment, and the corrosion (rust generation) state of the steel material under the coating film. The means for visually confirming the above was studied earnestly.
First, the present inventors examined a means by which the corrosion (rusting) state of the steel material under the coating film can be visually confirmed regardless of the swelling or peeling of the coating film. Then, focusing on the fact that iron ions are generated along with the corrosion of steel materials, the inventors came up with the idea of using a substance that develops color by reacting with iron ions.
そこで、本発明者らは更に検討を進めた結果、このような物質を塗膜に含有させれば、塗膜表面を目視観察することをもって塗膜下における鋼材の腐食発生（発錆）を容易に確認できることを知見した。塗膜下における鋼材が腐食（発錆）すると、基材となる鋼材と塗膜との界面で鉄イオンが発生し、この鉄イオンは主に塗膜欠陥部を伝って塗膜表面まで拡散する。そこで、鉄イオンと反応することで発色する物質を塗膜に含有させておけば、塗膜の表面が発色するため、目視観察することをもって塗膜下における鋼材の腐食（発錆）を認識できることを知見した。 Therefore, as a result of further investigations, the present inventors have made it easy to cause corrosion (rusting) of the steel material under the paint film by visually observing the paint film surface if such a substance is contained in the paint film. It was found that it can be confirmed. When the steel under the coating is corroded (rusting), iron ions are generated at the interface between the steel material and the coating as the base material, and these iron ions mainly diffuse through the coating film defects and diffuse to the coating surface. . Therefore, if the coating film contains a substance that develops color by reacting with iron ions, the surface of the coating film will develop color, and corrosion (rusting) of the steel material under the coating film can be recognized by visual observation. I found out.
また、鉄イオンと反応することで発色する物質を塗膜に含有させず、鋼構造物の保守点検時に上記物質を鋼構造物の表面に塗布することにより、塗膜下における鋼材の腐食（発錆）状態を確認する手段も考えられる。しかしながら、係る手段では、保守点検を行うたびに上記物質を鋼構造物の表面に塗布することを要する。そして、一般的に鋼構造物は大型であるうえ、厳しい自然環境下に施工されていることが多いため、保守点検時に上記物質を鋼構造物の表面に塗布する作業は極めて煩雑である。また、上記のような方法では、錆成分が塗膜表面に出てきた後、もしくは塗膜にピンホールなどの欠陥が発生した後にしか検知できない。これに対し、鉄イオンと反応することで発色する物質を予め塗膜に含有させておけば、鋼構造物の保守点検時、特別な措置を採らずとも錆の発生初期に、外観を目視観察するという単純作業で、塗膜下における鋼材の腐食（発錆）状態を確認できることを知見した。 In addition, the coating material does not contain a substance that develops color by reacting with iron ions, and is applied to the surface of the steel structure during maintenance inspection of the steel structure. A means for confirming the (rust) state is also conceivable. However, with such means, it is necessary to apply the substance to the surface of the steel structure every time maintenance inspection is performed. And since a steel structure is generally large and is often constructed in a harsh natural environment, the operation of applying the above-mentioned substance to the surface of the steel structure during maintenance and inspection is extremely complicated. Moreover, in the above methods, it can be detected only after a rust component has come out on the surface of the coating film or after a defect such as a pinhole has occurred in the coating film. On the other hand, if the coating film contains a substance that develops color by reacting with iron ions, the appearance is visually observed at the initial stage of rust generation without taking special measures during maintenance inspection of steel structures. It has been found that the corrosion (rusting) state of the steel material under the coating can be confirmed by a simple operation.
本発明は上記の知見に基づき完成されたものであり、その要旨は次のとおりである。
［１］ 溶剤中に樹脂と顔料とを含有し、鋼材表面に塗布して塗膜を形成するための防錆用塗料であって、前記樹脂と前記顔料に加えて鉄イオンと反応して発色する物質を含有することを特徴とする防錆用塗料。
The present invention has been completed based on the above findings, and the gist thereof is as follows.
[1] A rust preventive paint containing a resin and a pigment in a solvent and applied to a steel material surface to form a coating film, which reacts with iron ions in addition to the resin and the pigment and develops color An anti-corrosion paint characterized by containing a substance to be used.
［２］ ［１］において、前記物質が、トリアジンまたは1,10-フェナントロリンであることを特徴とする防錆用塗料。 [2] A rust preventive paint according to [1], wherein the substance is triazine or 1,10-phenanthroline.
［３］ ［１］または［２］において、前記物質の含有量が、塗膜形成成分に対する質量％で3％以上20％以下であることを特徴とする防錆用塗料。 [3] A rust-preventing paint as set forth in [1] or [2], wherein the content of the substance is 3% or more and 20% or less in terms of mass% based on the film-forming component.
［４］ 基板である鋼材表面に塗膜を形成してなる塗装鋼材であって、前記塗膜が樹脂と顔料に加えて鉄イオンと反応して発色する物質を含有することを特徴とする塗装鋼材。 [4] A coated steel material in which a coating film is formed on the surface of a steel material as a substrate, wherein the coating film contains a substance that develops color by reacting with iron ions in addition to a resin and a pigment. Steel material.
［５］ ［４］において、前記物質が、トリアジンまたは1,10-フェナントロリンであることを特徴とする塗装鋼材。 [5] A coated steel material according to [4], wherein the substance is triazine or 1,10-phenanthroline.
［６］ ［４］または［５］において、前記物質の含有量が、乾燥状態での塗膜全質量に対する質量％で3％以上20％以下であることを特徴とする塗装鋼材。 [6] The coated steel material according to [4] or [5], wherein the content of the substance is 3% or more and 20% or less by mass% with respect to the total mass of the coating film in a dry state.
本発明によれば、塗膜の塗り替えを必要とする塗装鋼材を適用した鋼構造物において、塗膜下の鋼材の腐食発生（発錆）を早期に、しかも目視で確認することができる。そのため、本発明によると、塗膜の塗り替えに適切な時期（塗膜下の鋼材の腐食（発錆）初期段階）を、煩雑な作業を伴わずに目視で簡便に判定することができる。そして、塗膜下の鋼材の腐食（錆）がさほど進行していないような適切な時期に塗膜の塗り替えを行うことにより、鋼構造物の防錆寿命を延長するとともにメンテナンスコストの低減化が可能となり、産業上格段の効果を奏する。 ADVANTAGE OF THE INVENTION According to this invention, the corrosion generation | occurrence | production (rusting) of the steel material under a coating film can be confirmed early and visually in the steel structure to which the coating steel material which needs repainting of a coating film is applied. Therefore, according to the present invention, it is possible to easily determine visually the appropriate time for recoating the coating film (the initial stage of corrosion (rusting) of the steel material under the coating film) without complicated operations. And by repainting the coating film at an appropriate time when the corrosion (rust) of the steel material under the coating film has not progressed much, the rust prevention life of the steel structure can be extended and the maintenance cost can be reduced. It becomes possible and has a remarkable effect on the industry.
以下、本発明について詳細に説明する。
まず、本発明の防錆用塗料について説明する。
本発明の防錆用塗料は、溶剤中に樹脂と顔料とを含有し、鋼材表面に塗布して塗膜を形成するための防錆塗料であって、前記樹脂と前記顔料に加えて鉄イオンと反応して発色する物質を含有することを特徴とする。
Hereinafter, the present invention will be described in detail.
First, the anticorrosive paint of the present invention will be described.
The rust preventive paint of the present invention is a rust preventive paint containing a resin and a pigment in a solvent and applied to a steel material surface to form a coating film, and in addition to the resin and the pigment, an iron ion It contains a substance that develops color by reacting with.
本発明において、鉄イオンと反応して発色する物質の種類は特に限定されず、例えば、トリアジン、1,10-フェナントロリン、チオシアン酸カリウム、チオシアン酸ナトリウム、チオシアン酸アンモニウムなどのチオシアン酸塩、フェロシアン化カリウム、フェロシアン化ナトリウムなどのフェロシアン塩、フェリシアン化カリウム、フェリシアン化ナトリウムなどのフェリシアン塩などが挙げられる。 In the present invention, the kind of substance that develops color by reacting with iron ions is not particularly limited. For example, triazine, 1,10-phenanthroline, potassium thiocyanate, sodium thiocyanate, thiocyanate such as ammonium thiocyanate, potassium ferrocyanide And ferricyan salts such as sodium ferrocyanide and ferricyan salts such as potassium ferricyanide and sodium ferricyanide.
また、本発明においては、鋼材の腐食の初期段階で生成する２価の鉄イオン(Fe2+)と反応して発色する物質を用いることが好ましい。このような物質を適用すれば、鋼材の腐食の初期段階で塗膜を発色させることができるため、目視観察によって塗膜下における鋼材腐食（発錆）を早期に発見することが可能となる。 In the present invention, it is preferable to use a substance that develops color by reacting with divalent iron ions (Fe 2+ ) generated in the initial stage of corrosion of the steel material. If such a substance is applied, the coating film can be colored at the initial stage of corrosion of the steel material, and therefore it is possible to detect steel material corrosion (rusting) under the coating film at an early stage by visual observation.
２価の鉄イオン(Fe2+)と反応して発色する物質としては、例えば、トリアジン、1,10-フェナントロリン、フェリシアン化カリウム、フェリシアン化ナトリウムなどのフェリシアン塩等が挙げられる。これらの中でも、トリアジン、1,10-フェナントロリンは有機物であることから、有機溶剤に可溶であり、しかも塗膜を構成する有機樹脂中への溶解度が他の無機系発色物質よりも高いため、塗膜中に、より分子レベルに近い状態で分散していると考えられ、他の無機系発色物質よりも早期での検知が可能となる。他の無機系発色物質は塗料作製時に無機粉末をボールミルなどで破砕して細かい固体粒子にして、それを塗膜中に分散させることになるので、本来目的とする腐食（発錆）検知効果以外の塗膜の剛性等の物性大きく変えてしまうことになる。このような観点から、有機物であるトリアジンまたは1,10-フェナントロリンが好ましい。トリアジンは、２価の鉄イオンと反応すると紫色の化合物を形成する。また、1,10-フェナントロリンは、２価の鉄イオンと反応するとオレンジ色の化合物を形成する。そのため、これらの物質を塗膜に含有させると、鋼材の腐食の初期段階で塗膜が発色し、目視観察によって塗膜下における鋼材腐食（発錆）を早期かつ容易に発見することが可能となる。 Examples of the substance that develops color by reacting with divalent iron ions (Fe 2+ ) include triazine, 1,10-phenanthroline, potassium ferricyanide, ferricyanide such as sodium ferricyanide, and the like. Among these, since triazine and 1,10-phenanthroline are organic substances, they are soluble in organic solvents and have higher solubility in the organic resin constituting the coating film than other inorganic color developing substances. It is thought that it is dispersed in a state closer to the molecular level in the coating film, and can be detected at an earlier stage than other inorganic coloring materials. Other inorganic coloring substances are crushed by a ball mill etc. during the preparation of paints to make fine solid particles and disperse them in the coating film, so other than the intended corrosion (rusting) detection effect The physical properties such as the rigidity of the coating film are greatly changed. From such a viewpoint, triazine or 1,10-phenanthroline which is an organic substance is preferable. Triazine forms a purple compound when reacted with divalent iron ions. 1,10-phenanthroline forms an orange compound when it reacts with divalent iron ions. Therefore, when these substances are included in the paint film, the paint film develops color at the initial stage of corrosion of the steel material, and it is possible to detect steel material corrosion (rusting) under the paint film early and easily by visual observation. Become.
防錆用塗料に含まれる上記物質（鉄イオンと反応して発色する物質）の含有量は、塗膜形成成分の合計質量、すなわち防錆用塗料を構成する成分のうち溶剤以外の成分である樹脂（該樹脂の硬化剤も含む）、顔料、鉄イオンと反応して発色する物質および後述する塗料調整剤の合計質量に対して、3質量％以上20質量％以下とすることが好ましい。上記含有量が3質量％未満になると、塗膜下における鋼材が腐食（発錆）しても、塗膜の十分な発色が期待できないため発色するまでの時間が長期になり、実際に流れ錆などが発生する時間に対してさほど早期に腐食を検知できなくなる。一方、上記含有量が20質量％を超えると、更なる塗膜発色効果が得られず、また、硬化性・透水性・可撓性などの塗膜物性、および塗装性を低下させる等、悪影響を及ぼすことが懸念される。なお、より早期に検知するという観点から10質量％以下がより好ましい。 The content of the above-mentioned substances (substances that react with iron ions to develop color) contained in the antirust coating is the total mass of the coating film forming components, that is, components other than the solvent among the components constituting the antirust coating. The content is preferably 3% by mass or more and 20% by mass or less with respect to the total mass of the resin (including the curing agent of the resin), the pigment, the substance that develops color by reacting with iron ions, and the paint adjusting agent described later. When the above content is less than 3% by mass, even if the steel material under the coating is corroded (rusting), sufficient color development of the coating cannot be expected, so it takes a long time until the color develops. Corrosion cannot be detected so early with respect to the time when the above occurs. On the other hand, if the content exceeds 20% by mass, no further coating color forming effect can be obtained, and the coating properties such as curability, water permeability and flexibility, and paintability are adversely affected. There is a concern that In addition, 10 mass% or less is more preferable from a viewpoint of detecting earlier.
本発明の防錆用塗料に用いる溶剤、該溶剤に含まれる樹脂および顔料としては、塗装鋼材の塗膜を形成する防錆用塗料の成分として一般的に用いられているものを適用することができる。たとえば、市販の防錆用塗料に、鉄イオンと反応することで発色する物質を添加してもよい。但し、本発明は、鉄イオンと反応することで発色する物質を塗膜に含有させ、鋼材の腐食時に塗膜を発色させることを目的としている。そのため、本発明では、防錆用塗料により形成される塗膜の色が、上記物質が鉄イオンと反応する際に発する色と異なる色となるように、塗膜に含まれる樹脂および顔料の種類を適宜選択する。 As the solvent used in the anti-corrosion paint of the present invention, the resin and the pigment contained in the solvent, those commonly used as components of the anti-corrosion paint for forming a coating film of a coated steel material can be applied. it can. For example, a substance that develops color by reacting with iron ions may be added to a commercially available antirust coating. However, an object of the present invention is to make the coating film contain a substance that develops color by reacting with iron ions, and to color the coating film when the steel material is corroded. Therefore, in the present invention, the type of resin and pigment contained in the coating film is such that the color of the coating film formed by the anticorrosive coating is different from the color emitted when the substance reacts with iron ions. Is appropriately selected.
本発明の防錆用塗料に用いる溶剤としては、例えば、キシレン、トルエン等の炭化水素系溶剤、イソプロピルアルコール、イソブチルアルコールなどのアルコール系溶剤、酢酸エチル、酢酸ブチルなどのエステル系溶剤、エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテルなどのセロソルブ系溶剤、メチルエチルケトン、シクロペンタノン等のケトン系溶剤等、通常、塗料用溶剤に使用されるものを用いることができる。ただし、塗料樹脂成分およびトリアジン、1,10-フェナントロリンを溶解できる組み合わせで使用することが好ましい。 Examples of the solvent used in the antirust coating of the present invention include hydrocarbon solvents such as xylene and toluene, alcohol solvents such as isopropyl alcohol and isobutyl alcohol, ester solvents such as ethyl acetate and butyl acetate, ethylene glycol mono A cellosolve solvent such as ethyl ether and ethylene glycol monobutyl ether, a ketone solvent such as methyl ethyl ketone and cyclopentanone, and the like, which are usually used as solvents for paints, can be used. However, it is preferable to use a combination that can dissolve the paint resin component, triazine, and 1,10-phenanthroline.
上記溶剤に含まれる樹脂としては、例えば、エポキシ樹脂、フェノキシ樹脂、およびそれらの硬化剤として作用するアミン系硬化剤、ポリアミド系硬化剤、イミダゾール系硬化剤、ジシアンジアミド系硬化剤、酸無水物系硬化剤、アルキッド、ウレタン樹脂、およびその原料になるポリオール、ポリイソシアネートなどが挙げられ、これらのいずれか１種を単独で使用しても２種以上を適宜併用してもよく、２液型としても１液型としてもよく、また、加熱により硬化するものでも、室温で硬化するものでもよい。塗膜の防錆性、鋼との密着性という観点からは、上記溶剤に含まれる樹脂をエポキシ樹脂とすることが好ましい。 Examples of the resin contained in the solvent include epoxy resins, phenoxy resins, and amine-based curing agents, polyamide-based curing agents, imidazole-based curing agents, dicyandiamide-based curing agents, and acid anhydride-based curings that act as their curing agents. Agents, alkyds, urethane resins, and polyols and polyisocyanates used as raw materials thereof. Any one of these may be used alone, or two or more may be used in combination as appropriate. It may be a one-component type, and may be cured by heating or cured at room temperature. From the viewpoint of rust prevention of the coating film and adhesion to steel, it is preferable that the resin contained in the solvent is an epoxy resin.
また、防錆用塗料に含まれる樹脂の含有量は、塗膜形成成分の合計質量に対して、20質量％以上90質量％以下とし、溶剤に溶解することが好ましい。上記含有量が20質量％未満になると、乾燥時間が長くなる、もしくは所望の膜厚の塗膜を得るための塗り重ね回数が増えるという問題が懸念される。一方、上記含有量が90質量％を超えると、粘度が上昇し塗装困難になるという問題が懸念される。なお、より好ましくは、30質量％以上80質量％以下である。 The content of the resin contained in the anticorrosive coating is preferably 20% by mass or more and 90% by mass or less with respect to the total mass of the coating film forming components, and is preferably dissolved in the solvent. When the content is less than 20% by mass, there is a concern that the drying time becomes long or the number of times of recoating for obtaining a coating film having a desired film thickness increases. On the other hand, if the content exceeds 90% by mass, there is a concern that the viscosity increases and it becomes difficult to paint. In addition, More preferably, they are 30 to 80 mass%.
上記溶剤に含まれる顔料としては、例えば、タルク、二酸化チタン、炭酸カルシウム、およびリン酸塩系防錆顔料、トリポリリン酸塩系防錆顔料など通常の塗料用の体質顔料、防錆顔料等が挙げられ、これらのいずれか１種を単独で使用しても２種以上を適宜併用してもよい。また、鉄イオンと反応して発色する物質と併用するという観点からは、ベンガラなど鉄を顔料中に含有するものは使用できず、鉄を含有しない顔料が好ましい。 Examples of the pigment contained in the solvent include talc, titanium dioxide, calcium carbonate, and extender pigments for ordinary paints such as phosphate-based anticorrosive pigments and tripolyphosphate-based anticorrosive pigments, and antirust pigments. Any one of these may be used alone, or two or more may be used in combination as appropriate. Further, from the viewpoint of using together with a substance that develops color by reacting with iron ions, those containing iron in the pigment such as Bengala cannot be used, and pigments containing no iron are preferred.
また、防錆用塗料に含まれる顔料の含有量は、塗膜形成成分の合計質量に対して、10質量％以上60質量％以下とすることが好ましい。上記含有量が10質量％未満になると、塗膜の防錆性が低下したり、所望の色合いが得られない、塗料の材料コストが高価なものになるという問題を招来するおそれがある。一方、上記含有量が60質量％を超えると、やはり、防錆性の低下を招いたり、塗装性の低下等の問題が懸念される。なお、より好ましくは30質量％以上60質量％以下である。 Moreover, it is preferable that content of the pigment contained in the coating material for rust prevention shall be 10 to 60 mass% with respect to the total mass of a coating-film formation component. When the content is less than 10% by mass, the rust prevention property of the coating film may be lowered, a desired color may not be obtained, and the material cost of the paint may be expensive. On the other hand, when the content exceeds 60% by mass, there is a concern about problems such as a decrease in rust prevention and a decrease in paintability. In addition, More preferably, it is 30 to 60 mass%.
なお、本発明の防錆用塗料には、溶剤に上記した樹脂、顔料、鉄イオンと反応して発色する物質を含有するほか、沈降防止剤、分散剤、消泡剤、レベリング剤、はじき防止剤、粘度調整剤などの各種添加剤や塗料調整剤等を含有することができる。これらの合計含有量は、塗膜形成成分の合計質量に対して、10質量％以下とすることが、塗膜の物性確保という観点から好ましい。 The anti-corrosion paint of the present invention contains the above-mentioned resin, pigment, and a substance that develops color by reacting with iron ions in the solvent. Various additives such as agents and viscosity modifiers, paint modifiers and the like can be contained. The total content of these is preferably 10% by mass or less with respect to the total mass of the coating film forming components from the viewpoint of securing the physical properties of the coating film.
本発明の防錆用塗料は、従前公知の方法により調製することができる。例えば、樹脂と各種添加剤を溶解した溶剤に、顔料とトリアジン、1,10-フェナントロリン等の鉄イオンと反応して発色する物質を分散させる方法などで調製することができる。 The antirust paint of the present invention can be prepared by a conventionally known method. For example, it can be prepared by a method in which a pigment and a substance that reacts with iron ions such as triazine and 1,10-phenanthroline are dispersed in a solvent in which a resin and various additives are dissolved.
次に、本発明の塗装鋼材について説明する。
本発明の塗装鋼材は、基板である鋼材表面に、上記の防錆用塗料により形成された塗膜を具えてなる塗装鋼材であって、前記塗膜が樹脂と顔料に加えて鉄イオンと反応して発色する物質を含有することを特徴とする。
Next, the coated steel material of the present invention will be described.
The coated steel material of the present invention is a coated steel material comprising a coating film formed of the above-mentioned anti-corrosion coating on the surface of the steel material as a substrate, and the coating film reacts with iron ions in addition to the resin and the pigment. And a substance that develops color.
本発明において、鉄イオンと反応して発色する物質の種類は特に限定されず、例えば、トリアジン、1,10-フェナントロリン、チオシアン酸カリウム、チオシアン酸ナトリウム、チオシアン酸アンモニウムなどのチオシアン酸塩、フェロシアン化カリウム、フェロシアン化ナトリウムなどのフェロシアン塩、フェリシアン化カリウム、フェリシアン化ナトリウムなどのフェリシアン塩などが挙げられる。 In the present invention, the kind of substance that develops color by reacting with iron ions is not particularly limited. For example, triazine, 1,10-phenanthroline, potassium thiocyanate, sodium thiocyanate, thiocyanate such as ammonium thiocyanate, potassium ferrocyanide And ferricyan salts such as sodium ferrocyanide and ferricyan salts such as potassium ferricyanide and sodium ferricyanide.
特に、鋼材の腐食の初期段階で生成する２価の鉄イオン(Fe2+)と反応して発色する物質を用いることが好ましいため、例えば、トリアジン、1,10-フェナントロリン、フェリシアン化カリウム、フェリシアン化ナトリウムなどのフェリシアン塩等が挙げられる。これらの中でも、上述した理由で有機物であるトリアジンまたは1,10-フェナントロリンが好ましい。 In particular, it is preferable to use a substance that develops color by reacting with divalent iron ions (Fe 2+ ) generated in the early stage of corrosion of steel materials. For example, triazine, 1,10-phenanthroline, potassium ferricyanide, ferricyan And ferricyan salts such as sodium halide. Of these, triazine or 1,10-phenanthroline, which is an organic substance, is preferred for the reasons described above.
塗膜中の前記物質（鉄イオンと反応して発色する物質）の含有量は、乾燥状態での塗膜の全質量に対して3質量％以上20質量％以下とすることが好ましい。鉄イオンと反応して発色する物質の含有量が3質量％未満であると、塗膜下における鋼材が腐食（発錆）しても塗膜発色効果が十分に発現しないため発色するまでの時間が長期になり、実際に流れ錆などが発生する時間に対してさほど早期に腐食を検知できなくなるおそれがある。一方、鉄イオンと反応して発色する物質の含有量が20質量％を超えると、更なる塗膜発色効果が得られないうえ、硬化性、透水性・可撓性などの塗膜物性、および塗装性を低下させるという問題が懸念される。
なお、より早期に検知するという観点から10質量％以下がより好ましい。
The content of the substance (a substance that develops color by reacting with iron ions) in the coating film is preferably 3% by mass to 20% by mass with respect to the total mass of the coating film in a dry state. If the content of the substance that develops color by reacting with iron ions is less than 3% by mass, even if the steel material under the coating is corroded (rusting), the coating coloring effect is not fully exhibited, so the time until coloring occurs However, there is a possibility that corrosion cannot be detected so early with respect to the time when flow rust or the like actually occurs. On the other hand, if the content of the substance that develops color by reacting with iron ions exceeds 20% by mass, further coating film coloring effect cannot be obtained, and coating film properties such as curability, water permeability and flexibility, and There is concern about the problem of reducing the paintability.
In addition, 10 mass% or less is more preferable from a viewpoint of detecting earlier.
また、塗膜は、例えば、エポキシ樹脂、フェノキシ樹脂、およびそれらの硬化剤として作用するアミン系硬化剤、ポリアミド系硬化剤、イミダゾール系硬化剤、ジシアンジアミド系硬化剤、酸無水物系硬化剤から形成されるもの、もしくはアルキッド、ウレタン樹脂などから形成されるものでよい。塗膜の防錆性、鋼との密着性という観点からは、エポキシ樹脂からなる塗膜であることが好ましい。 The coating film is formed from, for example, an epoxy resin, a phenoxy resin, and an amine curing agent, a polyamide curing agent, an imidazole curing agent, a dicyandiamide curing agent, and an acid anhydride curing agent that act as a curing agent thereof. Or formed from alkyd, urethane resin, or the like. From the viewpoint of rust prevention of the coating film and adhesion to steel, a coating film made of an epoxy resin is preferable.
塗膜中の樹脂の含有量は、乾燥状態での塗膜の全質量に対して20質量％以上90質量％以下とすることが好ましい。樹脂の含有量が20質量％未満であると、塗膜の防錆性が低下するという問題が懸念される。一方、樹脂の含有量が90質量％を超えると、塗料コストが高くなる、塗膜物性が低下するという問題を招来する。なお、より好ましくは30質量％以上50質量％以下である。 The content of the resin in the coating film is preferably 20% by mass or more and 90% by mass or less with respect to the total mass of the coating film in a dry state. If the resin content is less than 20% by mass, there is a concern that the rust preventive property of the coating film is lowered. On the other hand, when the resin content exceeds 90% by mass, the coating cost increases and the physical properties of the coating film deteriorate. In addition, More preferably, it is 30 to 50 mass%.
また、上記塗膜中に含まれる顔料としては、例えば、タルク、二酸化チタン、炭酸カルシウム、およびリン酸塩系防錆顔料、トリポリリン酸塩系防錆顔料など通常の塗料用の体質顔料、防錆顔料等が挙げられ、これらのいずれか１種を単独で使用しても２種以上を適宜併用してもよいが、鉄を顔料中に含有しない顔料が好ましい。 Examples of the pigment contained in the coating film include, for example, talc, titanium dioxide, calcium carbonate, phosphate-based anti-rust pigments, tripolyphosphate-based anti-rust pigments, extender pigments for ordinary paints, and anti-rust. A pigment etc. are mentioned, and any one of these may be used alone, or two or more may be used in combination as appropriate, but a pigment containing no iron in the pigment is preferred.
塗膜中の顔料の含有量は、乾燥状態での塗膜の全質量に対して10質量％以上60質量％以下とすることが好ましい。顔料の含有量が10質量％未満であると、塗膜の防錆性が低下したり、所望の色合いが得られない、塗料の材料コストが高価なものになるという問題が懸念される。一方、顔料の含有量が60質量％を超えると、やはり、防錆性の低下を招いたり、塗装性の低下等という問題を招来する。なお、より好ましくは30質量％以上60質量％以下である。 The content of the pigment in the coating film is preferably 10% by mass or more and 60% by mass or less with respect to the total mass of the coating film in a dry state. If the content of the pigment is less than 10% by mass, there is a concern that the rust preventive property of the coating film is lowered, a desired color is not obtained, and the material cost of the paint becomes expensive. On the other hand, if the pigment content exceeds 60% by mass, it also causes problems such as a decrease in rust prevention and a decrease in paintability. In addition, More preferably, it is 30 to 60 mass%.
なお、本発明における塗膜は、樹脂、顔料、鉄イオンと反応して発色する物質を含むほか、沈降防止剤、分散剤、消泡剤、レベリング剤、はじき防止剤、粘度調整剤などの各種添加剤や塗料調整剤等を含有することができる。塗膜中のこれらの合計含有量は、乾燥状態での塗膜の全質量に対して10質量％以下とすることが、塗膜の物性確保の観点からは好ましい。 In addition, the coating film in the present invention includes various substances such as an anti-settling agent, a dispersant, an antifoaming agent, a leveling agent, an anti-fogging agent, and a viscosity adjusting agent in addition to a resin, pigment, and a substance that develops color by reacting with iron ions. Additives, paint modifiers, and the like can be included. The total content of these in the coating film is preferably 10% by mass or less with respect to the total mass of the coating film in a dry state from the viewpoint of securing the physical properties of the coating film.
本発明の塗装鋼材は、基板である鋼材表面に、上記した塗料、すなわち溶剤中に所望の樹脂、顔料、鉄イオンと反応する物質を含有する防錆用塗料を用いて塗膜を形成することによって得られるが、基材となる鋼材の種類は特に問わない。
また、塗膜を形成する手段についても特に問わず、従前公知の手段が何れも適用可能である。一例を挙げれば、塗装前の鋼材（基材）表面に、通常のブラスト、ケレン等の下処理を施したのち、上記した塗料をロールコート法、スプレー法、刷毛塗り法、浸漬法等によって塗布して常温乾燥もしくは焼付け処理を施すことにより、塗膜を形成する。
The coated steel material of the present invention forms a coating film on the surface of the steel material, which is a substrate, using the above-described paint, that is, a rust preventive paint containing a substance that reacts with a desired resin, pigment, or iron ion in a solvent. However, the type of steel material used as a base material is not particularly limited.
Further, the means for forming a coating film is not particularly limited, and any conventionally known means can be applied. For example, after pretreatment of the steel material (base material) before coating with normal blasting, keren, etc., the above coating is applied by roll coating, spraying, brushing, dipping, etc. Then, a coating film is formed by drying at room temperature or baking.
塗膜の厚さは、20μm以上3000μm以下とすることが好ましい。塗膜の厚さが20μm未満であると、十分な防食（防錆）効果が発現しないという問題が懸念される。一方、塗膜の厚さが3000μmを超えると、鉄イオンと反応して発色する物質と腐食（発錆）によって鋼材−塗膜界面で発生した鉄イオンとが反応し発色しても、外観からは分かりにくいという問題がある。特に、顔料等が塗膜中に多く含まれている場合は、塗膜表面から鋼材−塗膜界面の着色は分かりにくいため、鉄イオンが塗膜表面まで拡散してこないと発色が外観から判別できなくなる。その結果、判別するのに長時間を要し、塗膜下における鋼材の腐食発生（発錆）を早期に認識できないおそれがある。なお、好ましくは200μm以上1000μm以下である。 The thickness of the coating film is preferably 20 μm or more and 3000 μm or less. If the thickness of the coating film is less than 20 μm, there is a concern that a sufficient anticorrosion (rust prevention) effect is not exhibited. On the other hand, if the thickness of the coating exceeds 3000 μm, the substance that reacts with iron ions and develops color, and the iron ions generated at the steel material-coating interface due to corrosion (rusting) react to develop color. There is a problem that is difficult to understand. In particular, when the paint film contains a large amount of pigment, the coloration of the steel-coating film interface from the paint film surface is difficult to understand. become unable. As a result, it takes a long time to discriminate, and there is a possibility that the occurrence of corrosion (rusting) of the steel material under the coating film cannot be recognized early. In addition, Preferably it is 200 micrometers or more and 1000 micrometers or less.
以上のように、鉄イオンと反応して発色する物質を含有する塗膜を具えた本発明の塗装鋼材によると、塗膜下の鋼材の腐食発生（発錆）を早期に、しかも目視で確認することができる。したがって、本発明の塗装鋼材を鋼構造物の素材に適用すれば、塗膜の塗り替えに適切な時期（塗膜下の鋼材の腐食（発錆）初期段階）を、煩雑な作業を伴わずに目視で簡便に判定することができる。また、塗膜表面における着色の有無は、遠方からの目視観察であっても容易に確認することができるため、大型の構造物や作業員が容易に立ち入ることのできない場所に施工された構造物であっても、構造物の表面を遠方から目視観察することによって塗膜の塗り替え時期を判定することができる。 As described above, according to the coated steel material of the present invention having a coating film containing a substance that develops color by reacting with iron ions, the corrosion (rusting) of the steel material under the coating film is confirmed early and visually. can do. Therefore, if the coated steel material of the present invention is applied to the material of the steel structure, the time suitable for repainting the coating film (the initial stage of corrosion (rusting) of the steel material under the coating film) can be obtained without complicated operations. It can be easily determined visually. In addition, since the presence or absence of coloring on the coating film surface can be easily confirmed even by visual observation from a distance, a large structure or a structure constructed in a place where workers cannot easily enter Even so, it is possible to determine the repainting time of the coating film by visually observing the surface of the structure from a distance.
防錆用塗料の調製
＜本発明例の塗料＞
溶剤（トルエン・１−ブタノール・メチルエチルケトン）に、表１に示した樹脂、発色物質（鉄イオンと反応して発色する物質）を室温にて溶解し、さらに、表１に示した顔料をボールミルで分散させ、さらに、一部のものには沈降防止剤を塗料調整剤として加え、最後に硬化剤を加え攪拌し、塗料P1〜8,10,11,13,14,22〜25を調製した。
また、市販のエポキシ樹脂塗料（関西ペイント(株)製、商品名：エポマリンEX300、白色）または２液型ポリウレタン樹脂塗料（関西ペイント(株)製、商品名：アレスレタン、白色）に、表１に示した発色物質（鉄イオンと反応して発色する物質）を室温にて溶解し、塗料P16,17,19,20を調製した。
＜比較例の塗料＞
鉄イオンと反応して発色する物質を添加しないことを除き、上記した本発明例の塗料と同じ方法によって塗料P9,12,15,18,21を調製した。
Preparation of anti-corrosion coating material <Coating material of the present invention>
In a solvent (toluene / 1-butanol / methyl ethyl ketone), the resin shown in Table 1 and a coloring substance (substance that develops color by reacting with iron ions) are dissolved at room temperature. Further, the pigment shown in Table 1 is ball milled. In addition, an anti-settling agent was added as a paint adjusting agent to a part of the mixture, and finally a curing agent was added and stirred to prepare paints P1 to 8,10,11,13,14,22 to 25.
Also, see Table 1 for commercially available epoxy resin paint (manufactured by Kansai Paint Co., Ltd., trade name: Epomarin EX300, white) or two-component polyurethane resin paint (manufactured by Kansai Paint Co., Ltd., trade name: Alesletan, white). The indicated coloring substances (substances that develop color by reacting with iron ions) were dissolved at room temperature to prepare paints P16, 17, 19, and 20.
<Comparative paint>
Coating materials P9, 12, 15, 18, and 21 were prepared by the same method as the coating material of the above-described example of the present invention, except that a substance that develops color by reacting with iron ions was not added.
＜試験片の作製＞
JIS G 3106(2008)に規定されたSM400鋼板（150mm×70mm×6mm）の表面（片面）に、ブラスト処理を施して、その表面粗さをJIS B 0601(2001)に規定された十点平均粗さで50±10μmに調整した。続いて、表面粗さが調整された鋼板の表面（片面）に、硬化剤を混合したばかりの表１に示す塗料をそれぞれ刷毛塗り法によって塗布したのち、乾燥処理を施して、乾燥状態で厚さ100±10μmの各種塗膜を形成して試験片とした。上記乾燥処理は、温度35℃、湿度65％RHの室内で７日間乾燥する処理とした。試験片は各2枚ずつ作製し、1枚は下記の塗膜硬化度判定に用い、残りの各1枚を用いて腐食確認試験を行なった。
<Preparation of test piece>
Blasting is applied to the surface (single side) of SM400 steel plate (150mm x 70mm x 6mm) specified in JIS G 3106 (2008), and the surface roughness is the 10-point average specified in JIS B 0601 (2001). The roughness was adjusted to 50 ± 10 μm. Subsequently, the paint shown in Table 1 just mixed with the curing agent was applied to the surface (one side) of the steel sheet with the adjusted surface roughness by a brush coating method, followed by a drying treatment to obtain a thick dry state. Various coating films having a thickness of 100 ± 10 μm were formed as test pieces. The drying treatment was a treatment of drying for 7 days in a room at a temperature of 35 ° C. and a humidity of 65% RH. Two test pieces were prepared, and one piece was used for the following coating degree determination, and the remaining one piece was used for a corrosion confirmation test.
＜塗膜硬化度判定＞
塗膜中央の部分を指先で強くこすり、指先に塗料が付着するか、塗膜表面に指紋痕が残るかという観点から、塗膜の硬化度を以下の基準で評価した。この評価では“○”および“◎”を合格とした。
◎：指先に塗料が付着せず、塗膜表面に指紋痕も残らない。
○：指先に塗料は付着しないが、塗膜表面に指紋痕が残る。
×：指先に塗料が付着し、且つ塗膜表面に指紋痕が残る。
<Coating degree determination>
The degree of cure of the coating film was evaluated based on the following criteria from the viewpoint of rubbing the center of the coating film strongly with the fingertip and whether the paint adheres to the fingertip or whether fingerprint marks remain on the coating film surface. In this evaluation, “◯” and “◎” were accepted.
A: The paint does not adhere to the fingertips, and no fingerprint marks remain on the coating surface.
○: The paint does not adhere to the fingertip, but a fingerprint mark remains on the surface of the coating film.
X: The paint adheres to the fingertips, and fingerprint marks remain on the surface of the coating film.
＜腐食確認試験＞
以上のようにして作製した試験片の中央に、塗膜下の鋼材面に達するまでの人工欠陥（欠陥の長さ：100mm）をカッターにて形成した。錆発生を検知するまでの時間につき、各試験片の相対比較を行なうために、以下に示す同一の条件下で大気暴露試験を実施した。
<Corrosion confirmation test>
In the center of the test piece produced as described above, an artificial defect (defect length: 100 mm) until reaching the steel surface under the coating film was formed with a cutter. In order to make a relative comparison of each test piece with respect to the time until the occurrence of rust was detected, an air exposure test was conducted under the same conditions shown below.
＜大気暴露試験条件＞
JIS Z 2381(2001)に準拠し、直接暴露試験方法にて試験片を大気暴露した。試験中、試験片表面を定期的（24時間に１回の割合）に目視観察し、外観変化を確認した。
目視観察の結果を、表２に示す。
<Air exposure test conditions>
In accordance with JIS Z 2381 (2001), the test piece was exposed to the atmosphere by a direct exposure test method. During the test, the surface of the test piece was visually observed regularly (once every 24 hours) to confirm a change in appearance.
The results of visual observation are shown in Table 2.
表２に示す結果から明らかであるように、鉄イオンと反応して発色する物質を塗膜に含む本発明例によると、鉄イオンと反応して発色する物質を塗膜に含まない比較例に比べて早期に外観変化が確認され、塗膜下における鋼材の腐食（発錆）を早期に確認することができた。 As is apparent from the results shown in Table 2, according to the example of the present invention in which the coating material contains a substance that reacts with iron ions and develops color, the comparative example does not contain a substance that reacts with iron ions and develops color. In comparison, the appearance change was confirmed early, and corrosion (rusting) of the steel material under the coating film could be confirmed early.
Claims (6)
The coated steel material according to claim 4 or 5, wherein the content of the substance is 3% or more and 20% or less by mass% with respect to the total mass of the coating film in a dry state.
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| US11236195B2 (en) * | 2020-02-24 | 2022-02-01 | Saudi Arabian Oil Company | Corrosion-indicating materials and methods of making and using the same |
| US20220204822A1 (en) * | 2010-11-19 | 2022-06-30 | Ppg Industries Ohio, Inc. | Structural adhesive compositions |
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| US11236195B2 (en) * | 2020-02-24 | 2022-02-01 | Saudi Arabian Oil Company | Corrosion-indicating materials and methods of making and using the same |
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