JP2009172958A - Coated steel sheet excellent in corrosion resistance - Google Patents
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Abstract
Description
本発明は耐食性に優れる塗装鋼板に関する。 The present invention relates to a coated steel sheet having excellent corrosion resistance.
建材、自動車、家電などの各分野で使用される鋼板は、用途に応じたサイズに裁断された後、所定形状に成形加工される。一般に前記用途に使用される鋼板は、塗膜が表面に設けられている塗装鋼板であり、塗装鋼板の平坦部や加工部では当初の耐食機能が維持される。しかし、塗装鋼板の切断端面は鋼素地（下地鋼）が露出しているため赤錆が発生しやすい。 Steel sheets used in various fields such as building materials, automobiles, and home appliances are cut into sizes according to their use, and then formed into a predetermined shape. In general, a steel plate used for the above-mentioned application is a coated steel plate having a coating film provided on the surface, and the original corrosion resistance function is maintained in a flat portion or a processed portion of the coated steel plate. However, since the steel base (underlying steel) is exposed at the cut end face of the coated steel plate, red rust is likely to occur.
このような切断端面での腐食、すなわち赤錆の発生を抑制するために、スプレーや刷毛などを用いて切断端面を塗装する方法、あるいは切断端面に防錆油を塗布する方法が採用されている。しかし、所定サイズに切断した鋼板の切断端面を含む表面に塗装を施す方法は作業性・生産性に劣る。また鋼板の形状によっては塗料を均一に塗布することが難しいことから、切断端面に塗膜の欠陥部（塗膜切れ）が生じやすい。従ってその部分から腐食が発生してしまうことがある。
防錆油を塗布する方法においても同様の問題があり、さらに防錆油の塗布により鋼板がべたついて、取り扱いが困難になるという問題もある。
In order to suppress the corrosion at the cut end face, that is, the occurrence of red rust, a method of coating the cut end face using a spray or a brush or a method of applying a rust preventive oil to the cut end face is employed. However, the method of coating the surface including the cut end surface of the steel sheet cut into a predetermined size is inferior in workability and productivity. In addition, depending on the shape of the steel sheet, it is difficult to uniformly apply the paint, and thus a defective portion of the coating film (coating failure) tends to occur on the cut end face. Therefore, corrosion may occur from that portion.
There is a similar problem in the method of applying the rust preventive oil, and there is also a problem that the steel sheet becomes sticky due to the application of the rust preventive oil and the handling becomes difficult.
一方、鋼板表面に形成した塗膜により、切断端面での耐食性を改善する方法が提案されている。例えば、特許文献１には、クロメート処理後の鋼板表面に、珪酸ナトリウム（Ｎａ２Ｏ・ｘＳｉＯ２）、リン酸水素ナトリウム（Ｎａ２ＨＰＯ４）等の塩基性アルカリ金属塩を含有する塗膜を設ける方法が開示されている。塩基性アルカリ金属塩は、塩化物イオン等が微細疵部に侵入することを遮断するため、当該塗装鋼板の端面は耐食性に優れるとされている。
On the other hand, a method for improving the corrosion resistance at the cut end face by using a coating film formed on the steel sheet surface has been proposed. For example,
また特許文献２には、リン酸マグネシウム等の非クロム系防錆塗料が配合された下塗り塗料と、水に対する接触角が６０度以下である上塗り塗膜を有する塗装鋼板が開示されている。当該塗装鋼板は、上塗り塗膜が親水性であるため、塗装鋼板に付着した水滴が展開しやすく、水滴膜厚が薄くなることから水滴が蒸発しやすいため、耐食性に優れるとされている。
特許文献１に記載されている技術は、屋外使用環境において塗膜から溶出した物質を切断端面に作用させ、当該端面での腐食を抑制する。しかしながら、当該文献に記載されている技術は６価クロムの使用が必要であり、環境適合性が悪いという問題があった。
The technique described in
また、特許文献２に記載されている塗装鋼板は、環境が多湿であると水滴が蒸発しにくい場合があるため、これとは異なる機構で塗装鋼板の耐食性を向上させる方法が望まれていた。
これらのことに鑑み、本発明は耐食性に優れた塗装鋼板を提供することを目的とする。
In addition, since the coated steel sheet described in
In view of these, an object of the present invention is to provide a coated steel sheet having excellent corrosion resistance.
発明者らは鋭意研究の結果、溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板の上に、水に対する接触角が８０度以上１３０度未満である塗膜を有する塗装鋼板により、上記目的が達成できることを見出し、本発明を完成させた。
すなわち、上記課題は以下の本発明により解決される。
As a result of diligent research, the inventors have found that the above object can be achieved by a coated steel sheet having a coating angle of 80 ° or more and less than 130 ° on a molten Zn—Al—Mg alloy-plated steel sheet. The headline and the present invention were completed.
That is, the said subject is solved by the following this invention.
［１］鋼板の上に塗膜を有する塗装鋼板であって、
前記鋼板は、溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板であり、
前記塗膜は、水に対する接触角が８０度以上１３０度未満である、塗装鋼板。
［２］前記塗膜は、高分子化合物と滑剤を含み、
前記滑剤の配合量は、高分子化合物１００質量部に対して、０．５質量部以上２質量部以下である［１］に記載の塗装鋼板。
［３］前記滑剤は、ポリオレフィン系ワックスである、［２］に記載の塗装鋼板。
［４］前記塗膜の高分子化合物は、ポリエステル樹脂、または、ポリフッ化ビニリデン樹脂とアクリル樹脂の混合樹脂である、［２］〜［３］いずれかに記載の塗装鋼板。
［５］前記めっき鋼板と前記塗膜の間に、第二の塗膜をさらに有し、
前記第二の塗膜は、Ｍｇを含む防錆顔料を有する、［１］〜［４］いずれかに記載の塗装鋼板。
[1] A coated steel sheet having a coating film on a steel sheet,
The steel plate is a hot-dip Zn-Al-Mg alloy-plated steel plate,
The said coating film is a coated steel plate whose contact angle with respect to water is 80 degree | times or more and less than 130 degree | times.
[2] The coating film includes a polymer compound and a lubricant,
The compounding quantity of the said lubricant is a coated steel plate as described in [1] which is 0.5 to 2 mass parts with respect to 100 mass parts of high molecular compounds.
[3] The coated steel sheet according to [2], wherein the lubricant is a polyolefin-based wax.
[4] The coated steel sheet according to any one of [2] to [3], wherein the polymer compound of the coating film is a polyester resin or a mixed resin of a polyvinylidene fluoride resin and an acrylic resin.
[5] A second coating film is further provided between the plated steel sheet and the coating film,
Said 2nd coating film is a coated steel plate in any one of [1]-[4] which has a rust preventive pigment containing Mg.
本発明により耐食性に優れた塗装鋼板が提供できる。 According to the present invention, a coated steel sheet having excellent corrosion resistance can be provided.
１．塗装鋼板
本発明の塗装鋼板は、鋼板の上に塗膜を有する塗装鋼板であって、
前記鋼板は、溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板であり、
前記塗膜は、水に対する接触角（「対水接触角」ともいう）が８０度以上１３０度未満であることを特徴とする。
塗装鋼板とは鋼板表面に塗膜を有する鋼板である。塗膜とは鋼板表面に塗料を塗布して（塗装して）得られる膜である。
1. Coated steel sheet The coated steel sheet of the present invention is a coated steel sheet having a coating film on the steel sheet,
The steel plate is a hot-dip Zn-Al-Mg alloy-plated steel plate,
The coating film has a contact angle with water (also referred to as “contact angle with water”) of 80 degrees or more and less than 130 degrees.
A coated steel sheet is a steel sheet having a coating film on the surface of the steel sheet. A coating film is a film | membrane obtained by apply | coating a coating material on the steel plate surface (painting).
（１）鋼板
鋼板とは板状の鋼である。本発明に用いられる鋼板は、溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板である。溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板とは、Ｚｎ（亜鉛）を主成分とし、Ａｌ（アルミニウム）、Ｍｇ（マグネシウム）を必須成分として含む合金の溶融めっき浴を用いてめっきされた鋼板をいう。このような合金の好ましい例には、Ａｌが３〜２２質量％、Ｍｇが１〜１０質量％、残部が実質的にＺｎからなる溶融Ｚｎ−Ａｌ−Ｍｇ合金が含まれる。「残部が実質的にＺｎからなる」とは、残部が４０質量％以上のＺｎを含み、当該めっき鋼板の耐食性を阻害せず、かつ当該めっき鋼板の製造自体が可能な範囲で、Ｚｎ、Ａｌ、Ｍｇ以外の元素を含んでいることを含む。Ｚｎ、Ａｌ、Ｍｇ以外の元素の例には、Ｔｉ、Ｂ、Ｓｉ、Ｆｅが含まれる。これらの元素の好ましい含有量は、合金に対し、Ｔｉ：０．１質量％以下、Ｂ：０．０５質量％以下、Ｓｉ：２質量％以下、Ｆｅ：２質量％以下である。
(1) Steel plate Steel plate is plate-like steel. The steel plate used in the present invention is a hot-dip Zn—Al—Mg alloy-plated steel plate. The hot-dip Zn—Al—Mg alloy-plated steel sheet refers to a steel sheet plated using a hot-dip plating bath of an alloy containing Zn (zinc) as a main component and Al (aluminum) and Mg (magnesium) as essential components. . A preferable example of such an alloy includes a molten Zn—Al—Mg alloy in which Al is 3 to 22% by mass, Mg is 1 to 10% by mass, and the balance is substantially made of Zn. “The balance is substantially made of Zn” means that the balance contains Zn of 40% by mass or more, does not impair the corrosion resistance of the plated steel sheet, and is within the range where the production of the plated steel sheet is possible. Including elements other than Mg. Examples of elements other than Zn, Al, and Mg include Ti, B, Si, and Fe. Preferable content of these elements is Ti: 0.1% by mass or less, B: 0.05% by mass or less, Si: 2% by mass or less, and Fe: 2% by mass or less with respect to the alloy.
また「残部が実質的にＺｎからなる」は、「残部に不可避的不純物が含まれている」ことも含む。不可避的不純物とは、めっき工程において意図していないにもかかわらず不可避的に混入する不純物をいう。 Further, “the balance is substantially made of Zn” includes “the balance contains inevitable impurities”. Inevitable impurities refer to impurities that are inevitably mixed although not intended in the plating process.
本発明に用いる鋼板は、公知の製造方法により得てよい。例えば、本発明に用いる鋼板は、連続溶融めっきラインにおいて製造することができる。鋼板は「塗装原板」とも呼ばれる。また、本発明において記号「〜」は、その両端の数値を含む。 The steel plate used in the present invention may be obtained by a known production method. For example, the steel sheet used in the present invention can be manufactured in a continuous hot dipping line. The steel plate is also called “painted original plate”. In the present invention, the symbol “˜” includes numerical values at both ends thereof.
本発明に用いられる鋼板は、必要に応じて公知の塗装前処理が施される。当該処理の例には、鋼板表面に、酸洗および表面調整処理（酸系）を施した後、任意のクロムフリー塗装前処理皮膜を形成する処理が含まれる。これらの塗装前処理により、鋼板と塗膜の密着性が向上する。 The steel sheet used in the present invention is subjected to known coating pretreatment as necessary. The example of the said process includes the process which forms the arbitrary chromium free coating pre-treatment film | membrane after performing the pickling and surface adjustment process (acid type) on the steel plate surface. These coating pretreatments improve the adhesion between the steel sheet and the coating film.
（２）塗膜
本発明の塗装鋼板は、対水接触角が８０度以上１３０度未満の塗膜（「撥水性塗膜」ともいう）を有する。撥水性塗膜の対水接触角は、好ましくは８５〜１１０度である。対水接触角とは、塗膜の水に対するなじみ性を表す尺度であり、なじみが悪い、すなわち塗膜が水をはじきやすいほど、対水接触角は高くなる。対水接触角は公知の方法で求められるが、本発明においては、２０±２℃の環境下で水平に静置された塗装鋼板の上に、直径約１．６ｍｍ（液量にして約２．１μＬ）の純水の水滴を滴下し、液滴が塗装鋼板表面となす角度から求めてよい。具体的には、液滴を真横から観察して、液滴の左右の端点における接線が、鋼板表面となす角度から対水接触角を求める。
(2) Coating Film The coated steel sheet of the present invention has a coating film (also referred to as “water-repellent coating film”) having a contact angle with water of 80 degrees or more and less than 130 degrees. The water contact angle of the water repellent coating film is preferably 85 to 110 degrees. The contact angle with water is a scale representing the conformability of a coating film to water, and the contact angle with water becomes higher as the conformance is worse, that is, the coating film is easier to repel water. The contact angle with water can be determined by a known method. In the present invention, the diameter is about 1.6 mm (the amount of liquid is about 2) on a coated steel plate placed horizontally in an environment of 20 ± 2 ° C. 0.1 μL) of pure water may be dropped, and the angle formed by the droplet and the surface of the coated steel sheet may be obtained. Specifically, the droplet is observed from the side, and the contact angle with water is determined from the angle formed by the tangents at the left and right end points of the droplet with the steel plate surface.
１）高分子化合物
撥水性塗膜は高分子化合物と滑剤を含むことが好ましい。高分子化合物は塗膜のマトリックス（「ビヒクル」ともいう）をなす。高分子化合物の例には、有機化合物が重合してなる有機系高分子化合物、無機化合物が重合してなる無機系高分子化合物がある。
1) Polymer compound The water-repellent coating film preferably contains a polymer compound and a lubricant. The polymer compound forms a matrix (also referred to as “vehicle”) of the coating film. Examples of the polymer compound include an organic polymer compound obtained by polymerizing an organic compound and an inorganic polymer compound obtained by polymerizing an inorganic compound.
高分子化合物としては、公知のものを用いることができる。好ましい高分子化合物の例には、ポリエステル樹脂、アクリル樹脂、ポリフッ化ビニリデン樹脂、ポリウレタン樹脂、エポキシ樹脂、ポリビニルアルコール樹脂、フェノール樹脂等の有機系高分子化合物が含まれる。中でも本発明に用いられる高分子化合物としては、ポリエステル樹脂、またはアクリル樹脂とポリフッ化ビニリデン樹脂からなる混合樹脂が好ましい。これらの高分子化合物は、密着性、耐熱性、加工性に優れる。 A well-known thing can be used as a high molecular compound. Examples of preferred polymer compounds include organic polymer compounds such as polyester resins, acrylic resins, polyvinylidene fluoride resins, polyurethane resins, epoxy resins, polyvinyl alcohol resins, and phenol resins. Among them, the polymer compound used in the present invention is preferably a polyester resin or a mixed resin composed of an acrylic resin and a polyvinylidene fluoride resin. These polymer compounds are excellent in adhesion, heat resistance, and processability.
ポリエステル樹脂とは主鎖にエステル結合を有するポリマーの総称である。ポリエステル樹脂には結晶性ポリエステル樹脂と非晶性ポリエステル樹脂があるが、本発明においては、塗装作業性に優れることから非晶性ポリエステル樹脂が好ましい。 The polyester resin is a general term for polymers having an ester bond in the main chain. The polyester resin includes a crystalline polyester resin and an amorphous polyester resin. In the present invention, an amorphous polyester resin is preferable because of excellent coating workability.
本発明のポリエステル樹脂の分子量はＧＰＣで測定した場合の数平均分子量が２０００〜２００００であることが好ましい。分子量が２０００より小さくなると加工性が悪くなる傾向があり、２００００より大きくなると耐候性が劣る傾向があるためである。 The number average molecular weight of the polyester resin of the present invention is preferably 2000 to 20000 as measured by GPC. This is because when the molecular weight is smaller than 2000, the workability tends to be poor, and when it is larger than 20000, the weather resistance tends to be inferior.
本発明のポリエステル樹脂のガラス転移温度（Ｔｇ）は、−２０〜８０℃であることが好ましい。Ｔｇが低いと塗膜硬度が不足し耐薬品性も劣る傾向があり、高いと加工性が劣る傾向があるためである。Ｔｇは示差走査熱量計（ＤＳＣ）法により測定される。 The glass transition temperature (Tg) of the polyester resin of the present invention is preferably -20 to 80 ° C. This is because when the Tg is low, the coating film hardness is insufficient and the chemical resistance tends to be inferior, and when the Tg is high, the workability tends to be inferior. Tg is measured by a differential scanning calorimeter (DSC) method.
ポリフッ化ビニリデン樹脂とアクリル樹脂からなる混合樹脂とは、ポリフッ化ビニリデン樹脂４０〜９０質量％とアクリル樹脂６０〜１０質量％を混合してなる樹脂をいう。
ポリフッ化ビニリデン樹脂とは、ポリエチレンのエチレンユニットにおける一つの炭素に、二つのフッ素原子が結合している高分子化合物をいう。ポリフッ化ビニリデン樹脂の重量平均分子量は３０００００〜７０００００であることが好ましい。
The mixed resin composed of the polyvinylidene fluoride resin and the acrylic resin refers to a resin obtained by mixing 40 to 90% by mass of the polyvinylidene fluoride resin and 60 to 10% by mass of the acrylic resin.
The polyvinylidene fluoride resin refers to a polymer compound in which two fluorine atoms are bonded to one carbon in an ethylene unit of polyethylene. The weight average molecular weight of the polyvinylidene fluoride resin is preferably 300,000 to 700,000.
アクリル樹脂とは、（メタ）アクリル酸又は（メタ）アクリル酸エステルの重合体をいう。前記と同様の理由からアクリル樹脂の数平均分子量は１００００〜１５０００であることが好ましい。同様にアクリル樹脂のＴｇは−１０〜１００℃であることが好ましい。 An acrylic resin means the polymer of (meth) acrylic acid or (meth) acrylic acid ester. For the same reason as described above, the number average molecular weight of the acrylic resin is preferably 10,000 to 15,000. Similarly, it is preferable that Tg of an acrylic resin is -10-100 degreeC.
２）滑剤
撥水性塗膜の対水接触角を前記範囲にする手段は特に限定されないが、塗膜に表面エネルギーの低い材料を含ませることが好ましい。表面エネルギーの低い材料は、塗装時に表面エネルギーが低い部位、すなわち塗膜表面に移動する。そのため、塗膜表面を表面エネルギーの低い状態、つまり撥水性が高い状態にすることができる。表面エネルギーの低い材料の好ましい例には、滑剤が含まれる。滑剤とは、一般に、樹脂に添加されて樹脂と金属との摩擦や付着を防止するために添加される添加剤をいう。滑剤の例には、ワックスやシリコーンオイルが含まれる。
2) Lubricant The means for setting the water contact angle of the water-repellent coating film in the above range is not particularly limited, but it is preferable to include a material having a low surface energy in the coating film. A material having a low surface energy moves to a portion having a low surface energy during coating, that is, to the surface of the coating film. Therefore, the surface of the coating film can be brought into a state having a low surface energy, that is, a state having high water repellency. A preferred example of a low surface energy material includes a lubricant. A lubricant generally refers to an additive that is added to a resin to prevent friction and adhesion between the resin and the metal. Examples of lubricants include wax and silicone oil.
一般に、塗装鋼板においては、塗膜の成形加工性を向上させるために、滑剤の中でもワックスが使用されることが多い。この場合ワックスは、塗膜中の高分子化合物１００質量部に対して０．０５〜０．３質量部程度配合される。しかし、本発明のように塗膜の対水接触角を８０度以上とするためには、塗膜の高分子化合物１００質量部に対して、滑剤を０．５〜２質量部配合することが好ましい。滑剤の添加量がこの範囲であると、塗膜の撥水性、および塗装鋼板の加工性のバランスに優れる。 In general, in a coated steel sheet, a wax is often used among lubricants in order to improve the forming processability of a coating film. In this case, the wax is mixed in an amount of about 0.05 to 0.3 parts by mass with respect to 100 parts by mass of the polymer compound in the coating film. However, in order to make the water contact angle of the coating film 80 degrees or more as in the present invention, 0.5-2 parts by mass of a lubricant may be blended with 100 parts by mass of the polymer compound of the coating film. preferable. When the addition amount of the lubricant is within this range, the balance between the water repellency of the coating film and the workability of the coated steel sheet is excellent.
ワックスの例には、公知の天然ワックス、合成ワックスが含まれる。天然ワックスの例には、天然パラフィン、カルナバロウが含まれる。合成ワックスの例には、合成パラフィン、ポリエチレン等のポリオレフィン系ワックス、四フッ化エチレン等のフッ素樹脂系ワックス、高級脂肪酸等の脂肪酸系ワックス、脂肪酸アミド等の脂肪酸アミド系ワックス、脂肪酸のアルコールエステル等のエステル系ワックス、ポリグリセロール等のアルコール系ワックス、金属石けんが含まれる。
シリコーンオイルの例には、フルオロシリコーン、アルキルシリコーンが含まれる。
Examples of the wax include known natural wax and synthetic wax. Examples of natural wax include natural paraffin and carnauba wax. Examples of synthetic waxes include synthetic paraffins, polyolefin waxes such as polyethylene, fluororesin waxes such as ethylene tetrafluoride, fatty acid waxes such as higher fatty acids, fatty acid amide waxes such as fatty acid amides, alcohol esters of fatty acids, etc. Ester waxes, alcohol waxes such as polyglycerol, and metal soaps.
Examples of the silicone oil include fluorosilicone and alkyl silicone.
本発明においては、入手が容易であって、かつ塗膜の撥水性を高めることができることから、ポリオレフィン系ワックスを用いることが好ましく、ポリエチレンワックスを用いることがより好ましい。 In the present invention, polyolefin wax is preferably used, and polyethylene wax is more preferably used because it is easily available and can improve the water repellency of the coating film.
ワックスは、形状が粒状であることが好ましく、その平均粒径は１〜１５μｍであることが好ましい。ワックスがこの形状であると塗料に添加しやすく、かつ塗装時に塗膜表面に移動（「ブリードアウト」ともいう）しやすいからである。
また、ワックスはその融点が１３０℃以下であることが好ましい。本発明の塗装鋼板は、後述するように塗装工程で２００〜３００℃に加熱されることが好ましいが、ワックスの融点の上限が前記範囲であると、塗装工程においてワックスがよりブリードアウトしやすいからである。しかし、ワックスの融点が低すぎると、塗膜の加工性が低下することがある。このため、ワックスの融点は５０℃以上であることが好ましい。
The wax is preferably granular in shape, and the average particle size is preferably 1 to 15 μm. This is because, when the wax is in this shape, it is easy to add to the paint and to move to the surface of the coating film during coating (also referred to as “bleed out”).
The melting point of the wax is preferably 130 ° C. or lower. As described later, the coated steel sheet of the present invention is preferably heated to 200 to 300 ° C. in the painting process, but if the upper limit of the melting point of the wax is within the above range, the wax is more likely to bleed out in the painting process. It is. However, when the melting point of the wax is too low, the processability of the coating film may be lowered. For this reason, it is preferable that melting | fusing point of a wax is 50 degreeC or more.
撥水性塗膜には、必要に応じ、アクリロニトリルビーズ等の有機系骨材、シリカ等の無機系骨材、顔料、メタリック顔料等、各種添加物が配合されていてもよい。当該塗膜の厚みは、撥水性、下地鋼の防錆、塗膜密着性を考慮して、７μｍ以上とすることが好ましい。さらにコスト、耐食性、隠蔽性、密着性等を総合的に考慮すると、膜厚は７〜３０μｍとすることがより好ましい。 Various additives such as organic aggregates such as acrylonitrile beads, inorganic aggregates such as silica, pigments and metallic pigments may be blended in the water-repellent coating film as necessary. The thickness of the coating film is preferably 7 μm or more in consideration of water repellency, rust prevention of the base steel, and coating film adhesion. Furthermore, considering cost, corrosion resistance, concealability, adhesion, etc., the film thickness is more preferably 7-30 μm.
本発明の塗装鋼板は、鋼板と撥水性塗膜の間に第二の塗膜、すなわち「下塗り塗膜」が形成されていてもよい。下塗り塗膜とは、下地の防食や隠蔽、または上塗り塗膜との密着性を向上させるために設けられる塗膜である。特に本発明のように滑剤を含む塗膜を有する塗装鋼板においては、塗膜と鋼板の密着性が低下することがあるが、下塗り塗膜を設けることにより、鋼板と塗膜の密着性を高めることができる。下塗り塗膜は、樹脂と防錆顔料を含むことが好ましい。この樹脂の例には、エポキシ樹脂、ポリエステル樹脂、ウレタン樹脂またはアクリル樹脂が含まれる。防錆顔料とは、耐食性を高めるために添加される顔料であり、その例には、リン酸マグネシウム、トリポリリン酸２水素アルミ・マグネシウム、カルシウムシリケートが含まれる。中でも防錆顔料としては、リン酸マグネシウム、トリポリリン酸２水素アルミ・マグネシウム等のＭｇを含む防錆顔料が好ましい。塗装鋼板の耐食性をより高められるからである。 In the coated steel sheet of the present invention, a second coating film, that is, an “undercoating film” may be formed between the steel sheet and the water-repellent coating film. The undercoat coating film is a coating film provided for the purpose of improving the anticorrosion and concealment of the base, or the adhesion with the topcoat film. In particular, in a coated steel sheet having a coating film containing a lubricant as in the present invention, the adhesion between the coating film and the steel sheet may be reduced, but by providing an undercoat coating film, the adhesion between the steel sheet and the coating film is increased. be able to. The undercoat coating film preferably contains a resin and a rust preventive pigment. Examples of this resin include epoxy resin, polyester resin, urethane resin or acrylic resin. A rust preventive pigment is a pigment added to enhance corrosion resistance, and examples thereof include magnesium phosphate, aluminum dihydrogen tripolyphosphate / magnesium, and calcium silicate. Among them, as the rust preventive pigment, a rust preventive pigment containing Mg such as magnesium phosphate, aluminum dihydrogen tripolyphosphate, and magnesium is preferable. This is because the corrosion resistance of the coated steel sheet can be further improved.
リン酸マグネシウムとはＭｇ３（ＰＯ４）２で表される化合物である。リン酸水素マグネシウムとはＭｇＨＰＯ４で表されるリン酸第一マグネシウム、またはＭｇ（Ｈ２ＰＯ４）２で表されるリン酸第二マグネシウムをいう。
トリポリリン酸二水素アルミ・マグネシウムとは、トリポリリン酸２水素アルミニウム（Ｈ２ＡｌＰ３Ｏ１０）にマグネシウムの化合物を含有させたものである。
Magnesium phosphate is a compound represented by Mg 3 (PO 4 ) 2 . Magnesium hydrogen phosphate refers to magnesium magnesium phosphate represented by MgHPO 4 or magnesium magnesium phosphate represented by Mg (H 2 PO 4 ) 2 .
The aluminum dihydrogen tripolyphosphate / magnesium is obtained by adding a magnesium compound to aluminum dihydrogen tripolyphosphate (H 2 AlP 3 O 10 ).
下塗り塗膜の膜厚は、２μｍ以上とすることが好ましい。しかしながら下塗り塗膜が厚くなりすぎるとコストの上昇や加工性低下などを引き起こすことがあるため、膜厚は２〜１０μｍであることが好ましい。 The thickness of the undercoat coating film is preferably 2 μm or more. However, if the undercoat film becomes too thick, it may cause an increase in cost or a decrease in workability, so the film thickness is preferably 2 to 10 μm.
本発明の塗装鋼板が下塗り塗膜を有する場合、撥水性塗膜は「上塗り塗膜」と呼ばれることがある。図１は、下塗り塗膜、上塗り塗膜を有する塗装鋼板の一例を示す図である。図中、１は塗装鋼板、２は溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板、３は化成処理層、４は下塗り塗膜、５は上塗り塗膜（撥水性塗膜）である。 When the coated steel sheet of the present invention has an undercoat coating film, the water-repellent coating film is sometimes referred to as “top coat film”. FIG. 1 is a diagram showing an example of a coated steel sheet having an undercoat film and an overcoat film. In the figure, 1 is a coated steel sheet, 2 is a molten Zn—Al—Mg alloy-plated steel sheet, 3 is a chemical conversion treatment layer, 4 is an undercoat film, and 5 is a topcoat film (water-repellent film).
（３）塗装鋼板
本発明の塗装鋼板は、溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板を塗装原板とするため、高湿潤環境においても、優れた耐食性を有する。このメカニズムは次のように推察される。
Ｚｎを含む鋼板においては、腐食によりＺｎを含む生成物（「Ｚｎ系腐食生成物」ともいう）が形成される。Ｚｎ系腐食生成物は、Ｚｎ−Ａｌ−Ｍｇ系合金由来のＭｇにより安定化され、より強固な腐食生成物となる。このため塗装鋼板の腐食は進行しにくくなり、塗装鋼板の耐食性が向上される。さらに、本発明の塗装鋼板は、撥水性の高い塗膜を有するため、鋼板の表面に存在する水滴は球状になり、鋼板表面を転がりやすくなる。このため、鋼板の表面の水滴は除去されやすくなる。すなわち、本発明の塗装鋼板は、安定な腐食生成物の形成と、腐食しやすい部位への水分の供給が低減されることの相乗効果により、優れた耐食性が発現されると考えられる。
(3) Coated steel sheet Since the coated steel sheet of the present invention uses a molten Zn—Al—Mg alloy-plated steel sheet as a coating base plate, it has excellent corrosion resistance even in a highly humid environment. This mechanism is presumed as follows.
In a steel sheet containing Zn, a product containing Zn (also referred to as a “Zn-based corrosion product”) is formed by corrosion. The Zn-based corrosion product is stabilized by Mg derived from the Zn—Al—Mg-based alloy and becomes a stronger corrosion product. For this reason, the corrosion of the coated steel sheet is difficult to proceed, and the corrosion resistance of the coated steel sheet is improved. Furthermore, since the coated steel sheet of the present invention has a coating film with high water repellency, water droplets present on the surface of the steel sheet become spherical and easily roll on the surface of the steel sheet. For this reason, water droplets on the surface of the steel sheet are easily removed. That is, the coated steel sheet of the present invention is considered to exhibit excellent corrosion resistance due to a synergistic effect of forming a stable corrosion product and reducing the supply of moisture to the corrosive site.
本発明の塗装鋼板は、鉛直に配置された場合に（図２を参照）、下部端面の耐食性に特に優れる。従来の塗装鋼板は、鉛直に配置された場合、大部分の水分が下部端面付近に溜まるため、下部端面の耐食性が著しく低下する。しかし本発明の塗装鋼板は、鉛直に配置されても、図２に示すとおり水滴６は下部端面から落下しやすく、下部端面に溜まりにくい。よって、下部端面への水分の供給が低減され、下部端面での赤錆発生が抑制される。
The coated steel sheet of the present invention is particularly excellent in the corrosion resistance of the lower end face when arranged vertically (see FIG. 2). When the conventional coated steel sheet is arranged vertically, most of the water accumulates in the vicinity of the lower end surface, so that the corrosion resistance of the lower end surface is significantly reduced. However, even if the coated steel sheet of the present invention is arranged vertically, the
本発明の塗装鋼板は、鉛直に配置された場合に振動を与えられると、水滴の落下がより顕著になる。そのため、本発明の塗装鋼板は、空気調和機（エアコン）の室外機の筐体等に好適に用いられる。 When the coated steel sheet of the present invention is vibrated when arranged vertically, the drop of water drops becomes more prominent. Therefore, the coated steel sheet of the present invention is suitably used for a housing of an outdoor unit of an air conditioner (air conditioner).
また、本発明の塗装鋼板は水平に配置されていても、優れた耐食性を発現できる。本発明の塗装鋼板に付着した水滴は、鋼板表面を転がりやすいため、例えば屋外に設置された場合、風などにより、容易に水滴が除去されるからである。 Moreover, even if the coated steel plate of this invention is arrange | positioned horizontally, it can express the outstanding corrosion resistance. This is because the water droplets adhering to the coated steel sheet of the present invention are likely to roll on the surface of the steel sheet.
このように本発明の塗装鋼板は、端面において特に優れた耐食性を発現できる。端面とは主として加工の際に切断された鋼板の部分をいう。また同様に、端面にかかわらず鋼板の表面部分であっても塗膜が欠損している部分、あるいは塗膜およびめっき層が欠損している部分に対しても本発明の塗装鋼板は優れた耐食性を有する。
塗装鋼板の端面の耐腐食性は公知の方法で評価できる。例えば、塗装鋼板から切り出したサンプルを屋外に曝露して切断端面の状態を観察することにより行ってよい。
Thus, the coated steel sheet of the present invention can exhibit particularly excellent corrosion resistance on the end face. The end face mainly refers to a portion of a steel plate cut during processing. Similarly, the coated steel sheet of the present invention has excellent corrosion resistance even on the surface part of the steel sheet regardless of the end face, even on the part where the coating film is missing or the part where the coating film and plating layer are missing. Have
The corrosion resistance of the end face of the coated steel plate can be evaluated by a known method. For example, it may be performed by exposing a sample cut out from a coated steel sheet to the outdoors and observing the state of the cut end face.
２．塗装鋼板の製造方法
本発明の塗装鋼板は発明の効果を損なわない範囲で任意に製造されうるが、以下好ましい製造方法を説明する。
本発明の撥水性塗膜は、例えばポリエステル樹脂等の樹脂に滑剤、必要に応じて各種添加剤を混合して得られる。混合する手段は特に限定されないが、撹拌機、三本ロール、ビーズミル等を用いることが好ましい。このとき溶媒を加えてもよい。
2. Manufacturing method of coated steel plate The coated steel plate of the present invention can be arbitrarily manufactured as long as the effects of the invention are not impaired, but a preferable manufacturing method will be described below.
The water-repellent coating film of the present invention is obtained, for example, by mixing a resin such as a polyester resin with a lubricant and, if necessary, various additives. The means for mixing is not particularly limited, but it is preferable to use a stirrer, three rolls, a bead mill or the like. At this time, a solvent may be added.
本発明の塗装鋼板は、このようにして得た塗料を鋼板表面に塗布する工程（塗布工程）、当該塗膜を加熱して乾燥させる工程（焼付工程）を経て製造されることが好ましい。
塗料を塗装原板に塗布する方法の例には、ロールコート、カーテンコート、ダイコート、ナイフコートが含まる。さらには、これらを用いた連続塗装ラインにより塗装を行ってもよい。塗料の塗布量は所望の膜厚となるように調整される。焼付工程は到達板温が１５０〜２５０℃となるように行うことが好ましい。
The coated steel sheet of the present invention is preferably produced through a process (application process) for applying the coating material thus obtained to the steel sheet surface and a process (baking process) for heating and drying the coating film.
Examples of the method of applying the paint to the coating original plate include roll coat, curtain coat, die coat, and knife coat. Furthermore, you may paint by the continuous coating line using these. The coating amount of the paint is adjusted so as to obtain a desired film thickness. The baking process is preferably performed so that the ultimate plate temperature is 150 to 250 ° C.
また、本発明の塗装鋼板に下塗り塗膜を形成する場合も、撥水性塗膜と同様に形成すればよい。この場合、まず、塗装原板に下塗り塗膜を形成し、次に、この下塗り塗膜の上に撥水性塗膜を形成する。 Moreover, what is necessary is just to form similarly to a water-repellent coating film also when forming an under_coat_film on the coated steel plate of this invention. In this case, first, an undercoat coating film is formed on the coating original plate, and then a water-repellent coating film is formed on the undercoat coating film.
［実施例１］
１）鋼板の準備
板厚０．５ｍｍのＡｌキルド鋼冷延鋼板（公称組成；Ｃ：０．０４質量％、Ｓｉ：０．０３質量％、Ｍｎ：０．２０質量％、Ｐ：０．０１質量％、Ｓ：０．０１質量％、Ａｌ：０．０１質量％、残部Ｆｅ）を準備した。溶融Ｚｎ−６質量％Ａｌ−３質量％Ｍｇ系合金めっき浴を用いて前記鋼板表面にめっきを施し、溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板（以下「ＺＡＭ」ともいう）を調製した。当該めっき鋼板の片面めっき付着量は８４ｇ／ｍ２であった。
[Example 1]
1) Preparation of steel plate Al killed steel cold-rolled steel plate having a thickness of 0.5 mm (nominal composition; C: 0.04 mass%, Si: 0.03 mass%, Mn: 0.20 mass%, P: 0.01) Mass%, S: 0.01 mass%, Al: 0.01 mass%, balance Fe). The surface of the steel sheet was plated using a molten Zn-6 mass% Al-3 mass% Mg-based alloy plating bath to prepare a molten Zn-Al-Mg-based alloy plated steel sheet (hereinafter also referred to as “ZAM”). The single-sided plating adhesion amount of the said plated steel plate was 84 g / m < 2 >.
このめっき鋼板に、酸洗処理、日本ペイント社製、ＮＰＣ７００を用いた表面調整処理、湯洗による洗浄処理、および乾燥を施した。続いてこのめっき鋼板表面に、Ｓｉ系のクロムフリー処理液（日本ペイント社製、ＥＣ２０００）をロールコーターで塗布し、１００℃で乾燥して、クロムフリー塗装前処理（化成処理）を施した。 The plated steel sheet was subjected to pickling treatment, surface treatment using Nippon Paint Co., Ltd., NPC700, washing treatment with hot water washing, and drying. Subsequently, a Si-based chromium-free treatment solution (EC2000, manufactured by Nippon Paint Co., Ltd.) was applied to the surface of the plated steel plate with a roll coater, and dried at 100 ° C. to perform a chromium-free coating pretreatment (chemical conversion treatment).
２）下塗り塗膜の形成
エポキシ変性高分子ポリエステル樹脂１００質量部に対し、カルシウムシリケート３０質量部を配合し、下塗り塗料とした。続いて、化成処理の施されためっき鋼板の上に、前記下塗り塗料をロールコートで塗布し、最高板到達温度が２００℃となるような条件で焼き付けて、下塗り塗膜を形成した。膜厚は７μｍとした。
2) Formation of undercoat coating film 30 parts by mass of calcium silicate was blended with 100 parts by mass of the epoxy-modified polymer polyester resin to obtain an undercoat paint. Subsequently, the undercoat paint was applied by roll coating on the plated steel sheet that had been subjected to chemical conversion treatment, and baked under conditions such that the maximum plate arrival temperature was 200 ° C. to form an undercoat coating film. The film thickness was 7 μm.
３）撥水性塗膜の形成
ポリエステル樹脂１００質量部に対し、ポリエチレンワックスを０．７質量部配合し、さらに溶媒（ソルベッソ１００：４０％，シクロヘキサン：４０％，ｎ−ブチルアルコール：１０％，キシレン１０％）を加え、混合して塗料を調製した。
下塗り塗膜が設けられためっき鋼板の上に、当該塗料をロールコートで塗布し、最高板到達温度が２３０℃となるような条件で焼き付けて、撥水性塗膜を形成した。撥水性塗膜の膜厚は１８μｍとした。
3) Formation of water-repellent coating film 0.7 parts by mass of polyethylene wax is blended with 100 parts by mass of polyester resin, and solvent (solvesso 100: 40%, cyclohexane: 40%, n-butyl alcohol: 10%, xylene) 10%) was added and mixed to prepare a paint.
On the plated steel plate provided with the undercoat coating film, the paint was applied by roll coating and baked under conditions such that the maximum plate temperature reached 230 ° C. to form a water-repellent coating film. The film thickness of the water repellent coating film was 18 μm.
４）撥水性評価
こうして得た塗装鋼板を２０±２℃の環境下に水平におき、その表面に、直径約１．６ｍｍ（液量にして約２．１μＬ）の水滴を滴下し、小さな液滴を形成した。続いて液滴を真横から観察して、液滴の左右の端点における接線が鋼板表面となす角度から、対水接触角を求めた。対水接触角が８０度以上であったものを撥水性○、８０度未満であったものを撥水性×と評価した。
4) Evaluation of water repellency The coated steel sheet thus obtained was placed horizontally in an environment of 20 ± 2 ° C., and water droplets with a diameter of about 1.6 mm (about 2.1 μL in liquid volume) were dropped on the surface to form a small liquid. Drops formed. Subsequently, the droplet was observed from the side, and the contact angle with water was determined from the angle formed by the tangents at the left and right end points of the droplet with the steel plate surface. The water repellency was evaluated when the water contact angle was 80 degrees or more, and the water repellency x when the water contact angle was less than 80 degrees.
５）湿潤試験
塗装鋼板を切断して、１００ｃｍ×１１０ｃｍの板を準備した（図３）。このサンプルを用いて、ＪＩＳ Ｋ ２２４６に準じて、９６０時間の湿潤試験を行った。試験後の下部の切断端面１０における赤錆発生率を測定した。
5) Wetting test A coated steel plate was cut to prepare a 100 cm × 110 cm plate (FIG. 3). Using this sample, a wet test for 960 hours was performed according to JIS K 2246. The red rust generation rate in the lower
赤錆発生率は、次のように求めた。
まず、図４に示すように端面１０の所々に発生した赤錆１１について、端面１０の長手方向における最大長さ１２を計測した。次に個々の赤錆１１について求められた最大長さ１２を合計して赤錆発生長さを求めた。続いて測定部位長さ１３を測定し、「赤錆発生長さ」を「測定部位長さ」で除すことにより、「赤錆発生率（％）」を求めた。赤錆発生率が１０％未満であったものを○、１０％以上３０％未満であったものを△、３０％以上であったものを×と評価し、○評価を合格と判定した。結果を表１に示す。
The red rust occurrence rate was determined as follows.
First, as shown in FIG. 4, the
［実施例２〜５］
撥水性塗膜に含まれるワックスをポリエチレンから、表１に示すワックスに変更した以外は、実施例１と同様にして塗装鋼板を調製し、評価した。各ワックスとして、酸化ポリエチレンワックス、天然ワックス、ＰＴＦＥワックス、フルオロシリコーンを用いた。
[Examples 2 to 5]
A coated steel sheet was prepared and evaluated in the same manner as in Example 1 except that the wax contained in the water-repellent coating film was changed from polyethylene to the wax shown in Table 1. As each wax, oxidized polyethylene wax, natural wax, PTFE wax, and fluorosilicone were used.
［実施例６］
下塗り塗膜に含まれる防錆顔料を、カルシウムシリケート３０質量部からトリポリリン酸２水素アルミ・マグネシウム３０質量部に変更した以外は、実施例１と同様に塗装鋼板を調製し、評価した。
[Example 6]
A coated steel sheet was prepared and evaluated in the same manner as in Example 1 except that the rust preventive pigment contained in the undercoat coating was changed from 30 parts by mass of calcium silicate to 30 parts by mass of aluminum dihydrogen tripolyphosphate.
［実施例７〜１２］
下塗り塗料に含まれる樹脂をエポキシ変性高分子ポリエステル樹脂から、エポキシ樹脂に、撥水性塗料に含まれる樹脂をポリエステル樹脂から、アクリル樹脂とポリフッ化ビニリデン樹脂（配合比は質量比にして３０：７０）に変更した以外は、それぞれ実施例１〜６と同様に塗装鋼板を調製し、評価した。
[Examples 7 to 12]
The resin contained in the undercoat paint is an epoxy-modified polymer polyester resin, the epoxy resin, the resin contained in the water-repellent paint is a polyester resin, an acrylic resin and a polyvinylidene fluoride resin (mixing ratio is 30:70 by mass ratio) A coated steel plate was prepared and evaluated in the same manner as in Examples 1 to 6 except that the change was made.
［比較例１］
撥水性塗料（上塗り塗料）が、ワックスを含まないこと以外は実施例１と同様にして、塗装鋼板を調製し、評価した。
[Comparative Example 1]
A coated steel sheet was prepared and evaluated in the same manner as in Example 1 except that the water repellent paint (top coat paint) did not contain wax.
［比較例２〜６］
撥水性塗料（上塗り塗料）において、ポリエステル樹脂１００質量部に対する各種滑剤の含有量を０．０５質量％とした以外は、それぞれ実施例１〜５と同様にして、塗装鋼板を調製し、評価した。
[Comparative Examples 2 to 6]
In the water-repellent coating (top coating), a coated steel sheet was prepared and evaluated in the same manner as in Examples 1 to 5 except that the content of various lubricants with respect to 100 parts by mass of the polyester resin was 0.05% by mass. .
［比較例７］
撥水性塗料（上塗り塗料）が、ワックスを含まないこと以外は実施例７と同様にして、塗装鋼板を調製し、評価した。
[Comparative Example 7]
A coated steel sheet was prepared and evaluated in the same manner as in Example 7 except that the water-repellent paint (top coat paint) did not contain wax.
［比較例８〜１２］
撥水性塗料（上塗り塗料）において、アクリル樹脂とポリフッ化ビニリデン樹脂の混合樹脂１００質量部に対する各種滑剤の含有量を０．０５質量％とした以外は、それぞれ実施例７〜１１と同様にして、塗装鋼板を調製し、評価した。
[Comparative Examples 8-12]
In the water-repellent paint (top coat paint), except that the content of various lubricants with respect to 100 parts by mass of the mixed resin of acrylic resin and polyvinylidene fluoride resin was 0.05% by mass, the same as in Examples 7 to 11, respectively. Coated steel plates were prepared and evaluated.
［比較例１３、１４］
板厚０．５ｍｍのＡｌキルド鋼冷延鋼板（公称組成；Ｃ：０．０４質量％、Ｓｉ：０．０３質量％、Ｍｎ：０．２０質量％、Ｐ：０．０１質量％、Ｓ：０．０１質量％、Ａｌ：０．０１質量％、残部Ｆｅ）を準備した。当該鋼板の表面に、溶融亜鉛めっきを施し、溶融亜鉛めっき鋼板（「ＧＩ」ともいう）を得た。この溶融亜鉛めっき鋼板の片面めっき付着量は７４ｇ／ｍ２であった。
塗装原板として、溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板の代わりに、前記溶融亜鉛めっき鋼板を用いた以外は実施例１、２と同様にして、塗装鋼板を調製し、評価した。
[Comparative Examples 13 and 14]
Al-killed cold-rolled steel sheet having a thickness of 0.5 mm (nominal composition; C: 0.04 mass%, Si: 0.03 mass%, Mn: 0.20 mass%, P: 0.01 mass%, S: 0.01% by mass, Al: 0.01% by mass, balance Fe) were prepared. The surface of the steel plate was hot dip galvanized to obtain a hot dip galvanized steel plate (also referred to as “GI”). The single-sided plating adhesion amount of this hot dip galvanized steel sheet was 74 g / m 2 .
A coated steel plate was prepared and evaluated in the same manner as in Examples 1 and 2 except that the hot dip galvanized steel plate was used in place of the hot-dip Zn-Al-Mg alloy-plated steel plate as the coating original plate.
表１から、実施例１〜１２の塗装鋼板は、めっき中にＭｇを含有する鋼板と、撥水性を有する（対水接触角が８０度以上）塗膜を有するため、切断端面の耐赤錆性に優れることが明らかである。また、下塗り塗膜中の防錆顔料にＭｇを含む実施例６、１２は、相乗効果により、最も優れた耐赤錆性を示した。 From Table 1, the coated steel sheets of Examples 1 to 12 have a steel sheet containing Mg during plating and a coating film having water repellency (water contact angle of 80 degrees or more), and therefore, the red rust resistance of the cut end face. It is clear that it is excellent. Moreover, Examples 6 and 12 containing Mg in the rust preventive pigment in the undercoat coating film showed the most excellent red rust resistance due to a synergistic effect.
一方、比較例１〜１２は、滑剤の添加量が少ないため、塗膜の撥水性が十分でなく（対水接触角が８０度未満）、端面の赤錆発生率が高くなった。さらに比較例１３、１４のめっき層中にＭｇを含有しない亜鉛めっき鋼板を塗装原板とする塗装鋼板は、塗膜が優れた撥水性（対水接触角８０度以上）を有していても、Ｍｇによる耐食効果が得られないため、赤錆発生率が高くなった。 On the other hand, in Comparative Examples 1-12, since the addition amount of the lubricant was small, the water repellency of the coating film was not sufficient (the contact angle with water was less than 80 degrees), and the incidence of red rust on the end face was high. Furthermore, the coated steel sheet using the zinc-plated steel sheet that does not contain Mg in the plating layers of Comparative Examples 13 and 14 as a coating original sheet has excellent water repellency (water contact angle of 80 degrees or more), Since the corrosion resistance effect due to Mg could not be obtained, the red rust occurrence rate increased.
本発明の塗装鋼板は耐食性に優れるため、建材、自動車、家電等の鋼板、特に屋外に設置される空気調和機用室外機等として有用である。 Since the coated steel sheet of the present invention is excellent in corrosion resistance, it is useful as a steel sheet for building materials, automobiles, home appliances, etc., particularly as an outdoor unit for an air conditioner installed outdoors.
１ 本発明の塗装鋼板
２ 溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板
３ 化成処理層
４ 第二の塗膜（下塗り塗膜）
５ 撥水性塗膜（上塗り塗膜）
６ 水滴
１０ 端面
１１ 端面に発生した赤錆
１２ 端面１０の長手方向における赤錆の最大値
１３ 測定部位長さ
DESCRIPTION OF
5 Water repellent coating (top coating)
6
Claims (5)
前記鋼板は、溶融Ｚｎ−Ａｌ−Ｍｇ系合金めっき鋼板であり、
前記塗膜は、水に対する接触角が８０度以上１３０度未満である、塗装鋼板。 A coated steel sheet having a coating on the steel sheet,
The steel plate is a hot-dip Zn-Al-Mg alloy-plated steel plate,
The said coating film is a coated steel plate whose contact angle with respect to water is 80 degree | times or more and less than 130 degree | times.
前記滑剤の配合量は、高分子化合物１００質量部に対して、０．５質量部以上２質量部以下である請求項１に記載の塗装鋼板。 The coating film includes a polymer compound and a lubricant,
The coated steel sheet according to claim 1, wherein the blending amount of the lubricant is 0.5 parts by mass or more and 2 parts by mass or less with respect to 100 parts by mass of the polymer compound.
前記第二の塗膜は、Ｍｇを含む防錆顔料を有する、請求項１に記載の塗装鋼板。 Between the plated steel sheet and the coating film, further having a second coating film,
The said 2nd coating film is a coated steel plate of Claim 1 which has a rust preventive pigment containing Mg.
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| JP2018176632A (en) * | 2017-04-19 | 2018-11-15 | 新日鐵住金株式会社 | Coated steel sheet |
| CN109332469A (en) * | 2013-12-17 | 2019-02-15 | 日新制钢株式会社 | Surface-treated metal plate |
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| JP5124296B2 (en) * | 2008-01-28 | 2013-01-23 | 日新製鋼株式会社 | Painted steel sheet with excellent corrosion resistance |
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| JP2018176632A (en) * | 2017-04-19 | 2018-11-15 | 新日鐵住金株式会社 | Coated steel sheet |
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