JP2001164194A - Zinc-rich coating excellent in corrosion-resistant property and coated metal plate - Google Patents
Zinc-rich coating excellent in corrosion-resistant property and coated metal plateInfo
- Publication number
- JP2001164194A JP2001164194A JP35251199A JP35251199A JP2001164194A JP 2001164194 A JP2001164194 A JP 2001164194A JP 35251199 A JP35251199 A JP 35251199A JP 35251199 A JP35251199 A JP 35251199A JP 2001164194 A JP2001164194 A JP 2001164194A
- Authority
- JP
- Japan
- Prior art keywords
- zinc
- mass
- corrosion resistance
- corrosion
- aluminum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鋼、鋼構造物、鋳
物等に良好な耐食性を付与するために、その表面を塗装
する塗料に関し、特に耐食性に優れたジンクリッチ塗料
およびそれを被覆に使用してなる塗装金属板を提供する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint for coating the surface of steel, steel structures, castings and the like in order to impart good corrosion resistance, and more particularly to a zinc-rich paint having excellent corrosion resistance and a coating for the same. An object of the present invention is to provide a coated metal plate used.
【０００２】[0002]
【従来の技術】従来、鋼、鋼構造物、鋳物等に耐食性を
付与する方法として、これら物品の表面にジンクリッチ
塗料を塗装する方法が知られている。これら従来のジン
クリッチ塗料においては、顔料として亜鉛の粉末を利用
し耐食性が付与されていた。2. Description of the Related Art Heretofore, as a method of imparting corrosion resistance to steel, steel structures, castings and the like, a method of applying a zinc-rich paint to the surface of these articles is known. In these conventional zinc-rich paints, corrosion resistance was imparted using zinc powder as a pigment.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、亜鉛の
粉末を利用したジンクリッチ塗料では、必ずしも耐食性
が十分に確保されていなかった。そこで、本発明は従来
の亜鉛系顔料を使用したものよりも、さらに耐食性に優
れたジンクリッチ塗料を提供するものである。However, zinc-rich paints using zinc powder have not always had sufficient corrosion resistance. Accordingly, the present invention provides a zinc-rich paint having more excellent corrosion resistance than a conventional paint using a zinc-based pigment.
【０００４】[0004]
【課題を解決するための手段】発明者らは、低コストで
耐食性に優れるジンクリッチ塗料の開発について鋭意研
究を重ねた結果、乾燥塗膜中に８０質量％以上の亜鉛−
アルミニウム−マグネシウム系合金粉末を含有した塗料
を使用することによって、優れた耐食性を得られること
を見いだして本発明をなしたものであって、その要旨と
するところは、 （１）質量％で、Ｍｇ：１〜１０％、Ａｌ：２〜１９％
を含有し、残部がＺｎ及び不可避的不純物よりなる亜鉛
−アルミニウム−マグネシウム系合金粉末を、乾燥塗膜
中に８０質量％以上含有することを特徴とする耐食性に
優れたジンクリッチ塗料。The inventors of the present invention have conducted intensive studies on the development of a zinc-rich paint which is low in cost and excellent in corrosion resistance.
The present invention has been made based on the finding that excellent corrosion resistance can be obtained by using a paint containing an aluminum-magnesium alloy powder, and the gist of the present invention is as follows. Mg: 1-10%, Al: 2-19%
A zinc-rich paint excellent in corrosion resistance, characterized in that the dry coating contains zinc-aluminum-magnesium-based alloy powder consisting of Zn and unavoidable impurities in a proportion of not less than 80% by mass.
【０００５】（２）前記亜鉛−アルミニウム−マグネシ
ウム系合金粉末の５０質量％以上が、Ａｌ／Ｚｎ／Ｚｎ
2 Ｍｇの三元共晶組織を主体とするものであることを特
徴とする前記（１）に記載の耐食性に優れたジンクリッ
チ塗料。 （３）前記亜鉛−アルミニウム−マグネシウム系合金粉
末の平均粒径が１〜３０μｍであることを特徴とする前
記（１）または（２）に記載の耐食性に優れたジンクリ
ッチ塗料。 （４）前記（１）〜（３）のいずれかに記載のジンクリ
ッチ塗料を被覆に使用してなる耐食性に優れた塗装金属
板である。(2) 50% by mass or more of the zinc-aluminum-magnesium alloy powder is Al / Zn / Zn
2. The zinc-rich paint excellent in corrosion resistance according to the above (1), which is mainly composed of a ternary eutectic structure of 2 Mg. (3) The zinc-rich paint excellent in corrosion resistance according to (1) or (2), wherein the zinc-aluminum-magnesium alloy powder has an average particle size of 1 to 30 μm. (4) A coated metal plate having excellent corrosion resistance, wherein the zinc-rich paint according to any one of (1) to (3) is used for coating.
【０００６】[0006]
【発明の実施の形態】以下に本発明を詳細に説明する。
本発明では、ジンクリッチ塗料の顔料として、亜鉛−ア
ルミニウム−マグネシウム系合金粉を使用する。ここで
亜鉛−アルミニウム−マグネシウム系合金は、Ｍｇ：１
〜１０質量％、Ａｌ：２〜１９質量％を含有し、残部が
Ｚｎ及び不可避的不純物よりなる。Ｍｇ：１〜１０質量
％、Ａｌ：２〜１９質量％を含有し、残部がＺｎ及び不
可避的不純物よりなる亜鉛−アルミニウム−マグネシウ
ム系合金は、合金添加量により、Ａｌ／Ｚｎ／Ｚｎ2 Ｍ
ｇの三元共晶組織を主体とした組織、または、Ａｌ／Ｚ
ｎ／Ｚｎ2 Ｍｇの三元共晶組織、Ｚｎ2 Ｍｇ相、Ｚｎ11
Ｍｇ2 相、Ａｌ相及びＺｎ相が混在した金属組織となる
ので、これを粉砕して得られる粉末は、こうした金属組
織が混在したものとなる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
In the present invention, a zinc-aluminum-magnesium alloy powder is used as a pigment for a zinc-rich paint. Here, the zinc-aluminum-magnesium alloy is Mg: 1
10 to 10% by mass, Al: 2 to 19% by mass, with the balance being Zn and unavoidable impurities. A zinc-aluminum-magnesium alloy containing Mg: 1 to 10% by mass and Al: 2 to 19% by mass, with the balance being Zn and unavoidable impurities, has an Al / Zn / Zn 2 M
g mainly composed of a ternary eutectic structure, or Al / Z
n / Zn 2 Mg ternary eutectic structure, Zn 2 Mg phase, Zn 11
Since the metal structure becomes a mixture of the Mg 2 phase, the Al phase, and the Zn phase, the powder obtained by pulverizing the mixture has a mixture of such metal structures.
【０００７】Ｍｇ：１〜１０質量％、Ａｌ：２〜１９質
量％を含有し、残部がＺｎ及び不可避的不純物よりなる
組成を使用する理由は、Ｚｎ−Ａｌ−Ｍｇ三元系合金で
は、Ｍｇ：３％、Ａｌ：４％、Ｚｎ：９３％の組成にお
いて、Ａｌ／Ｚｎ／Ｚｎ2 Ｍｇの三元共晶点が存在し、
この三元共晶点近傍の組成においてＡｌ／Ｚｎ／Ｚｎ 2
Ｍｇの三元共晶組織が得られる。このＡｌ／Ｚｎ／Ｚｎ
2 Ｍｇの三元共晶組織は、犠牲防食作用が高いため、本
発明における顔料として最も効果が高い。このＡｌ／Ｚ
ｎ／Ｚｎ2 Ｍｇの三元共晶組織を主体とする粒子が５０
質量％以上得られる合金組成の範囲が、Ｍｇ：１〜１０
質量％、Ａｌ：２〜１９質量％であるため、本組成の合
金を使用する。Mg: 1 to 10% by mass, Al: 2 to 19 substances
%, The balance being Zn and unavoidable impurities
The reason for using the composition is Zn-Al-Mg ternary alloy.
Has a composition of 3% Mg, 4% Al and 93% Zn.
And Al / Zn / ZnTwoThere is a ternary eutectic point of Mg,
In the composition near this ternary eutectic point, Al / Zn / Zn Two
A ternary eutectic structure of Mg is obtained. This Al / Zn / Zn
TwoThe ternary eutectic structure of Mg has a high sacrificial anticorrosion effect.
Most effective as a pigment in the invention. This Al / Z
n / ZnTwo50 particles mainly composed of a ternary eutectic structure of Mg
The range of the alloy composition obtained by mass% or more is Mg: 1 to 10
% By mass and Al: 2 to 19% by mass.
Use gold.
【０００８】好ましくは、成分調整だけでなく、粉砕前
のインゴットにおいて、Ａｌ／Ｚｎ／Ｚｎ2 Ｍｇの三元
共晶組織が５０質量％以上得られている組織であること
を、組織観察によって確認のうえで粉砕に供する。亜鉛
−アルミニウム−マグネシウム系合金粉の塗膜中の含有
量は８０質量％以上が望ましい。これは亜鉛−アルミニ
ウム−マグネシウム合金系材料の塗膜中の含有量が８０
質量％未満では耐食性向上効果が不十分となるためであ
る。上限は特に規定しないが、９０質量％を超えると塗
膜の欠陥が増加しやすくなる。したがって、乾燥塗膜に
おいて８０〜９０質量％の範囲となるようにすることが
好ましい。Preferably, not only the composition adjustment but also the observation of the ingot before pulverization confirms that the ternary eutectic structure of Al / Zn / Zn 2 Mg is 50% by mass or more in the ingot. And then pulverize. The content of the zinc-aluminum-magnesium alloy powder in the coating film is desirably 80% by mass or more. This is because the content of the zinc-aluminum-magnesium alloy-based material in the coating film is 80%.
If the amount is less than mass%, the effect of improving corrosion resistance will be insufficient. The upper limit is not particularly defined, but if it exceeds 90% by mass, the defects of the coating film tend to increase. Therefore, it is preferable that the content is in the range of 80 to 90% by mass in the dried coating film.
【０００９】また、使用する亜鉛−アルミニウム−マグ
ネシウム系合金粉の平均粒径を１〜３０μｍに限定した
理由は、１μｍ未満では塗料に混入する前に粒子が酸化
し易く耐食性を向上させる効果が認められなくなるため
であり、逆に、３０μｍを超えると塗料中に均一に分散
させることが困難になるためである。平均粒径の測定方
法は、特に規定しないが、気体分子が粒子表面に吸着さ
れる量を測定するＢＥＴ法などから求められる比表面積
から計算するのが一般的である。The reason why the average particle size of the zinc-aluminum-magnesium alloy powder used is limited to 1 to 30 μm is that if the average particle size is less than 1 μm, the particles are easily oxidized before being mixed into the paint, and the effect of improving the corrosion resistance is recognized. On the other hand, if it exceeds 30 μm, it becomes difficult to uniformly disperse it in the paint. The method for measuring the average particle size is not particularly limited, but is generally calculated from the specific surface area obtained by the BET method or the like for measuring the amount of gas molecules adsorbed on the particle surface.
【００１０】本発明に使用される塗料は、溶剤型、水溶
性型いずれでも良く、例えば、エポキシ樹脂、アルキド
樹脂、オイルフリーポリエステル樹脂、アクリル樹脂、
アクリルエチレン樹脂、メラミン樹脂、ウレタン樹脂、
フェノール樹脂、ポリカーボネート樹脂などが挙げら
れ、これら２種類以上の混合物でもかまわない。被覆方
法は、粉体顔料が混合された樹脂であることを考慮して
選択すれば、刷毛塗り、スプレー塗装、ロールコートな
ど公知のいずれの方法から選択してもよく、また、それ
らを任意に組み合わせても良い。本発明が、その対象と
する金属原板は、主として鉄系材料、例えば必要に応じ
Ｚｎなどをめっきした鋼板とするが、犠牲防食により防
食効果を得るものであるから、使用する亜鉛−アルミニ
ウム−マグネシウム系合金より卑な電位である金属には
本発明の効果は期待できる。The coating used in the present invention may be of a solvent type or a water-soluble type. Examples thereof include epoxy resins, alkyd resins, oil-free polyester resins, acrylic resins,
Acrylic ethylene resin, melamine resin, urethane resin,
Phenol resins, polycarbonate resins and the like can be mentioned, and a mixture of two or more of these may be used. The coating method may be selected from any known methods such as brush coating, spray coating, roll coating, and the like, as long as it is selected in consideration of the resin in which the powder pigment is mixed. They may be combined. The present invention is directed to a metal base sheet mainly made of an iron-based material, for example, a steel sheet plated with Zn or the like as necessary. However, since a sacrificial corrosion-preventing effect is obtained, the zinc-aluminum-magnesium used is used. The effect of the present invention can be expected for a metal having a potential lower than that of a system alloy.
【００１１】[0011]
【実施例】次に、本発明の実施例を示す。まず、厚さ
３．２ｍｍの亜鉛めっき鋼板を準備し、アーク溶接を使
用して、つけ合わせ溶接を行った。その後、ビード部が
中心になるようにして試料を１５０×７０ｍｍに切り出
し、ビード部を金ブラシで磨いた後、表２に示すジンク
リッチ塗料を６０μｍ塗装した。有機被覆に使用した亜
鉛−アルミニウム−マグネシウム合金系材料は表１に示
す合金を、樹脂は表２に示す樹脂を用いた。Next, examples of the present invention will be described. First, a 3.2 mm-thick galvanized steel sheet was prepared, and butt welding was performed using arc welding. Thereafter, the sample was cut into 150 × 70 mm with the bead portion as the center, and the bead portion was polished with a gold brush, and then a zinc rich paint shown in Table 2 was applied at 60 μm. The zinc-aluminum-magnesium alloy-based materials used for the organic coating were the alloys shown in Table 1, and the resins were the resins shown in Table 2.
【００１２】[0012]
【表１】 [Table 1]
【００１３】耐食性は、次のようなサイクル腐食試験を
６０サイクル実施し、ビード部における赤錆の発生面積
率を調査した。 塩水噴霧：３５℃、５％塩水、２時間 乾燥：６０℃、４時間 湿潤：５０℃、湿度９５％以上、２時間As for the corrosion resistance, the following cyclic corrosion test was carried out for 60 cycles, and the area ratio of the occurrence of red rust in the bead portion was examined. Salt spray: 35 ° C, 5% salt water, 2 hours Drying: 60 ° C, 4 hours Wetting: 50 ° C, humidity 95% or more, 2 hours
【００１４】耐食性の評価は、赤錆発生状況を以下に示
す評点づけで判定した。評点は○を合格とした。 ○：赤錆発生率 １０％未満 △：赤錆発生率 １０％以上、３０％未満 ×：赤錆発生率 ３０％以上 評価結果は表２に示す通りであり、本発明の実施例が高
い耐食性を有することがわかる。The evaluation of corrosion resistance was based on the following evaluation of the occurrence of red rust. The evaluation was "good". ：: Red rust occurrence rate of less than 10% Δ: Red rust occurrence rate of 10% or more and less than 30% ×: Red rust occurrence rate of 30% or more The evaluation results are as shown in Table 2, and the examples of the present invention have high corrosion resistance. I understand.
【００１５】[0015]
【表２】 [Table 2]
【００１６】[0016]
【発明の効果】以上のように、本発明は、亜鉛−アルミ
ニウム−マグネシウム系合金粉末を使用することで、塗
布するだけで極めて効果的に耐食性を得ることのできる
ジンクリッチ塗料およびそれを被覆に使用してなる耐食
性に優れた塗装金属板を提供することができ、その産業
上の価値は極めて高いといえる。As described above, the present invention uses a zinc-aluminum-magnesium alloy powder to provide a zinc-rich paint which can obtain corrosion resistance extremely effectively only by coating, and a coating for the same. A coated metal sheet having excellent corrosion resistance can be provided, and its industrial value is extremely high.
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Claims (4)
〜１９％を含有し、残部がＺｎ及び不可避的不純物より
なる亜鉛−アルミニウム−マグネシウム系合金粉末を、
乾燥塗膜中に８０質量％以上含有することを特徴とする
耐食性に優れたジンクリッチ塗料。1. A mass% of Mg: 1 to 10%, Al: 2
A zinc-aluminum-magnesium-based alloy powder containing up to 19%, with the balance being Zn and unavoidable impurities,
A zinc-rich paint excellent in corrosion resistance, characterized in that it is contained in a dry coating film in an amount of 80% by mass or more.
系合金粉末の５０質量％以上が、Ａｌ／Ｚｎ／Ｚｎ2 Ｍ
ｇの三元共晶組織を主体とするものであることを特徴と
する請求項１に記載の耐食性に優れたジンクリッチ塗
料。2. 50% by mass or more of the zinc-aluminum-magnesium alloy powder is Al / Zn / Zn 2 M
2. A zinc-rich paint having excellent corrosion resistance according to claim 1, wherein the zinc-rich paint has a ternary eutectic structure of g.
系合金粉末の平均粒径が１〜３０μｍであることを特徴
とする請求項１または２に記載の耐食性に優れたジンク
リッチ塗料。3. The zinc-rich paint having excellent corrosion resistance according to claim 1, wherein the zinc-aluminum-magnesium alloy powder has an average particle size of 1 to 30 μm.
リッチ塗料を被覆に使用してなる耐食性に優れた塗装金
属板。4. A coated metal plate having excellent corrosion resistance, wherein the zinc-rich paint according to claim 1 is used for coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35251199A JP2001164194A (en) | 1999-12-13 | 1999-12-13 | Zinc-rich coating excellent in corrosion-resistant property and coated metal plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35251199A JP2001164194A (en) | 1999-12-13 | 1999-12-13 | Zinc-rich coating excellent in corrosion-resistant property and coated metal plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001164194A true JP2001164194A (en) | 2001-06-19 |
Family
ID=18424575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35251199A Pending JP2001164194A (en) | 1999-12-13 | 1999-12-13 | Zinc-rich coating excellent in corrosion-resistant property and coated metal plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001164194A (en) |
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