JP3485457B2 - Corrosion-resistant steel plates for fuel tanks with excellent corrosion resistance and weldability - Google Patents

Corrosion-resistant steel plates for fuel tanks with excellent corrosion resistance and weldability

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Publication number
JP3485457B2
JP3485457B2 JP31985797A JP31985797A JP3485457B2 JP 3485457 B2 JP3485457 B2 JP 3485457B2 JP 31985797 A JP31985797 A JP 31985797A JP 31985797 A JP31985797 A JP 31985797A JP 3485457 B2 JP3485457 B2 JP 3485457B2
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JP
Japan
Prior art keywords
corrosion resistance
steel sheet
weldability
corrosion
layer
Prior art date
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Expired - Fee Related
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JP31985797A
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Japanese (ja)
Other versions
JPH11152555A (en
Inventor
純 真木
輝明 伊崎
雅裕 布田
秀一 武井
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Nippon Steel Corp
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Nippon Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/028—Including graded layers in composition or in physical properties, e.g. density, porosity, grain size

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Coating With Molten Metal (AREA)

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、自動車のガソリン
タンク材に要求される耐食性と溶接性とを兼備した燃料
タンク用防錆鋼板の製造法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a rustproof steel sheet for a fuel tank, which has both the corrosion resistance and the weldability required for a gasoline tank material for automobiles.

【０００２】[0002]

【従来の技術】燃料タンクは自動車の重要保安部品であ
るため、この燃料タンクに使用される材料には高度の耐
食性が要求される。具体的には、孔あき腐食や、燃料フ
ィルター目詰まりに繋がる大量の腐食生成物発生を起こ
すことの無いことが必要である。また最近の自動車業界
においては、従前にも増して車体の機能性、デザイン性
が重視される傾向にある。自動車燃料タンクの設計は、
車体のデザインに合わせて最後に設計されることが通常
で、その形状は益々複雑になっている。このため材料と
しては、高度のプレス成形や様々な接合を受けた後の耐
食性が特に重要である。2. Description of the Related Art Since fuel tanks are important safety parts for automobiles, the materials used for fuel tanks are required to have a high degree of corrosion resistance. Specifically, it is necessary not to cause pitting corrosion and generation of a large amount of corrosion products that lead to clogging of the fuel filter. In the recent automobile industry, the functionality and design of the vehicle body tend to be more important than ever. Automotive fuel tank design
It is usually designed last according to the body design, and its shape is becoming more and more complicated. For this reason, corrosion resistance after being subjected to a high degree of press molding and various joining is particularly important as a material.

【０００３】従来よりこの自動車燃料タンク用材料とし
ては、ターンシートと称されるＰｂ−Ｓｎ合金めっき鋼
板（特公昭５７−６１８３３号公報）が主に使用されて
いる。この材料はガソリンに対して安定な化学的性質を
持ち、かつプレス成形性に優れ、まためっき皮膜が柔軟
で、成形後もめっきにクラック等が入ることがなく、従
って優れた加工後の耐食性を有している。これ以外にも
亜鉛めっき鋼板に厚クロメート処理を施した鋼板（特公
昭５３−１９９８１号公報）も使用されており、Ｐｂ−
Ｓｎ合金程ではないが、やはり優れた加工性、耐食性を
有している。しかし近年Ｐｂの環境への影響が考慮さ
れ、環境への負荷という意味からもＰｂを使用しない材
料が希求されている。Conventionally, a Pb-Sn alloy-plated steel sheet (Japanese Patent Publication No. 57-61833) called a turn sheet has been mainly used as a material for automobile fuel tanks. This material has stable chemical properties for gasoline, has excellent press formability, and has a flexible plating film that does not cause cracks in the plating after molding, thus providing excellent corrosion resistance after processing. Have In addition to this, a steel plate obtained by subjecting a galvanized steel plate to a thick chromate treatment (Japanese Patent Publication No. 53-19981) is also used.
Although it is not as good as Sn alloy, it also has excellent workability and corrosion resistance. However, in recent years, the effect of Pb on the environment has been taken into consideration, and a material that does not use Pb has been sought after from the viewpoint of the load on the environment.

【０００４】また、近年の原油問題に関連したガソリン
不足を補うため、ガソリンに容易にブレンドでき、安価
で、燃焼させても有害なガスを生じにくいという利点を
持つメタノールやエタノールといったアルコール燃料の
導入率が年々拡大の傾向にある。しかしこれらのアルコ
ールやアルコール混合燃料を自動車用燃料に使用する際
に、これらの燃料はガソリンとは異なる腐食特性を持つ
ことから、従来のガソリンタンク用の材料は腐食のため
に使用できない可能性が強い。Further, in order to make up for the shortage of gasoline related to the recent problem of crude oil, introduction of alcohol fuel such as methanol or ethanol, which has the advantages that it can be easily blended with gasoline, is inexpensive, and hardly produces harmful gas even when burned, The rate tends to increase year by year. However, when using these alcohols or alcohol-blended fuels as fuels for automobiles, since these fuels have different corrosion characteristics from gasoline, conventional materials for gasoline tanks may not be usable due to corrosion. strong.

【０００５】具体的には、Ｐｂ−Ｓｎ合金めっき鋼板に
ついて言えば、Ｐｂ−Ｓｎ合金自体がメタノールやエタ
ノールなどのアルコールに溶解しやすい性質を有してい
るという問題点がある。一方亜鉛めっき鋼板に厚クロメ
ート処理を施した材料については、亜鉛は鉄に比べて卑
な電位を持つ金属であるから、プレス加工部等のめっき
層が損傷した箇所では亜鉛の犠牲防食作用で赤錆、孔あ
きの発生は抑制されるが、亜鉛自身の溶出速度が大き
く、浮遊性の白色沈澱物を多量に生成して燃料循環系統
でフィルターの目詰まりを発生しやすい問題点を有す
る。Specifically, in the case of a Pb-Sn alloy plated steel sheet, there is a problem that the Pb-Sn alloy itself has a property of being easily dissolved in alcohol such as methanol or ethanol. On the other hand, with regard to the material that has undergone thick chromate treatment on a galvanized steel sheet, zinc is a metal with a base potential lower than that of iron, so at locations where the plating layer is damaged, such as in the press working area, zinc sacrificial corrosion resistance causes red rust. Although the formation of perforations is suppressed, the elution rate of zinc itself is large, and there is a problem that a large amount of floating white precipitates are generated and the filter is easily clogged in the fuel circulation system.

【０００６】こういった背景から、Ｐｂを使用せず、Ｚ
ｎよりも耐食性に優れた材料が求められている。その候
補の一つが、Ａｌ（Ａｌ−Ｓｉ）めっき鋼板である。Ａ
ｌはその表面に安定な酸化皮膜が形成されるため、耐食
性が良好で、アルコールやその混合ガソリン、あるいは
ガソリン等が劣化したときに生じる有機酸に対しても耐
食性が良好である。従ってＡｌめっき鋼板は、燃料タン
ク材料として大変有望な材料であるといえる。実際に特
公平４−６８３９９号公報において、Ａｌめっき鋼板に
クロメート処理を施したアルコール燃料用燃料タンク用
鋼板が提案されている。しかしながらこれまでＡｌめっ
き鋼板が燃料タンク材料として使用されてこなかったの
は、タンク材料として使用する上で幾つかの難点がある
からである。From such a background, Pb is not used and Z
A material having a corrosion resistance higher than n is required. One of the candidates is an Al (Al-Si) plated steel sheet. A
Since l has a stable oxide film formed on its surface, it has good corrosion resistance and also has good corrosion resistance against alcohols and mixed gasoline thereof, or organic acids generated when gasoline or the like deteriorates. Therefore, it can be said that the Al plated steel sheet is a very promising material as a fuel tank material. In fact, Japanese Examined Patent Publication No. 4-68399 proposes a steel plate for a fuel tank for alcohol fuel in which an Al-plated steel plate is chromated. However, the Al-plated steel sheet has not been used as a fuel tank material until now, because there are some problems in using it as a tank material.

【０００７】それは、主として溶接性、特に溶接性と耐
食性の高度なバランスをとることが困難なためである。
すなわち、Ａｌめっき鋼板は、確かに耐食性に優れる
が、Ａｌ系被覆層は溶接電極の銅との反応性が高いため
に、電極が容易にＡｌとの反応物となり、電極の欠損と
なりやすい。これを防止するためには、Ａｌ系被覆層の
厚みを薄くする必要がある。一方で、十分な耐食性を得
るにはＡｌ系被覆層の厚みを厚くする必要があり、その
両性能を満たす付着量域が極めて狭い、あるいは殆ど無
いという問題があった。This is mainly because it is difficult to maintain a high balance between weldability, particularly weldability and corrosion resistance.
That is, although the Al-plated steel sheet is certainly excellent in corrosion resistance, since the Al-based coating layer has high reactivity with the copper of the welding electrode, the electrode easily becomes a reaction product with Al and the electrode is apt to be damaged. In order to prevent this, it is necessary to reduce the thickness of the Al-based coating layer. On the other hand, in order to obtain sufficient corrosion resistance, it is necessary to increase the thickness of the Al-based coating layer, and there has been a problem that the adhesion amount region that satisfies both of these properties is extremely narrow or almost nonexistent.

【０００８】[0008]

【発明が解決しようとする課題】そこで本発明におい
て、前記の溶接性と耐食性を両立する。すなわち、スポ
ット連続打点性に優れ、かつ通常のガソリンや酸化劣化
したガソリンは勿論のこと、メタノール、エタノール等
のアルコール燃料、あるいはこれらアルコール混合ガソ
リンに対して優れた耐食性を発揮し、しかもＰｂを使用
することの無い燃料タンク用防錆鋼板を提供するもので
ある。Therefore, in the present invention, the above-mentioned weldability and corrosion resistance are compatible. That is, it has excellent spot continuous hitting properties and exhibits excellent corrosion resistance not only to ordinary gasoline and gasoline that has been oxidized and deteriorated, but also to alcohol fuels such as methanol and ethanol, or gasoline mixed with these alcohols, and uses Pb. The present invention provides a rust preventive steel plate for a fuel tank that does not do so.

【０００９】[0009]

【課題を解決するための手段】本発明者らは、上記のよ
うな防錆鋼板を開発すべく種々検討した結果、従来と同
等の付着量で従来よりも大幅に耐食性に優れるＡｌめっ
き鋼板を開発し、耐食性と溶接性の両立を達成した。以
下本発明を詳細に説明する。本発明者らはＡｌめっき鋼
板の腐食挙動を詳細に検討し、次のような知見を持つに
至った。つまり通常の塩素分の高くない中性域におい
て、腐食はまずＡｌ系被覆層中を共晶Ｓｉに沿って開始
し、金属間化合物層（以降合金層と称す）まで至ると合
金層の腐食電位はＡｌ系被覆層、地鉄のそれよりも高い
（貴な）ため、Ａｌ系被覆層−合金層界面、あるいは合
金層−地鉄界面に沿って腐食が進行する。このため、特
に付着量の少ないときには、前記したＡｌ系被覆層−合
金層界面腐食の影響が大きくなり、Ａｌ系被覆層本来の
寿命よりも短い時間で被覆層が消失しやすい。塩素分の
多い環境では、Ａｌ系被覆層がほぼ完全に消耗するまで
は地鉄の腐食は起こらないが、やはりＡｌ系被覆層−合
金層界面での腐食がＡｌ系被覆層の腐食を促進する作用
を有している。Means for Solving the Problems As a result of various studies to develop the above-mentioned rust-preventing steel sheet, the present inventors have found that an Al-plated steel sheet having an adhesion amount equivalent to that of the conventional one and having a significantly superior corrosion resistance to the conventional one. Developed and achieved both corrosion resistance and weldability. The present invention will be described in detail below. The present inventors have studied the corrosion behavior of Al-plated steel sheets in detail, and have come to the following knowledge. In other words, in a normal neutral region where the chlorine content is not high, corrosion first starts along the eutectic Si in the Al-based coating layer, and reaches the intermetallic compound layer (hereinafter referred to as the alloy layer) Is higher (noble) than that of the Al-based coating layer and the base metal, so that the corrosion progresses along the Al-based coating layer-alloy layer interface or the alloy layer-base iron interface. Therefore, particularly when the amount of adhesion is small, the influence of the Al-based coating layer-alloy layer interface corrosion described above becomes large, and the coating layer is likely to disappear in a time shorter than the original life of the Al-based coating layer. In an environment with a large amount of chlorine, corrosion of the base metal does not occur until the Al-based coating layer is almost completely consumed, but again corrosion at the Al-based coating layer-alloy layer interface promotes corrosion of the Al-based coating layer. Has an effect.

【００１０】そこで本発明者らは、この合金層の悪影響
を改善すべく鋭意検討し、合金層にＣｒを含有させるこ
とで合金層−Ａｌ系被覆層、あるいは合金層−地鉄の界
面腐食を防止できることを知見し、本発明を完成させ
た。Ｃｒの作用は明確ではないが、合金層は地鉄、Ａｌ
系被覆層の界面腐食でいずれもカソードとして働くた
め、このカソード反応が抑制されたものと推定される。Therefore, the inventors of the present invention have made extensive studies to improve the adverse effect of the alloy layer, and by including Cr in the alloy layer, the interfacial corrosion between the alloy layer and the Al-based coating layer or the alloy layer and the base steel is prevented. They have found that they can be prevented, and have completed the present invention. Although the action of Cr is not clear, the alloy layer is composed of base iron, Al
It is presumed that this cathode reaction was suppressed because both of them act as a cathode due to the interfacial corrosion of the system coating layer.

【００１１】本発明の要旨とするところは以下の通りで
ある。 （１）被めっき鋼板の表面に、その平均組成が重量％
で、Ｆｅ：２５〜５０％、Ｓｉ：３〜２０％、Ｃｒ：
０．０６〜１％、残部がＡｌおよび不可避的不純物から
なり、かつ厚みが５μｍ以下である金属間化合物層を有
し、前記金属間化合物層の表面に、重量％で、Ｓｉ：２
〜１３％、Ｆｅ：１％以下、Ｃｒ：０．００２〜０．１
％未満、残部がＡｌおよび不可避的不純物からなるＡｌ
系被覆層を有することを特徴とする耐食性、溶接性に優
れた燃料タンク用防錆鋼板。The gist of the present invention is as follows. (1) The average composition is wt% on the surface of the steel sheet to be plated.
Then, Fe: 25 to 50%, Si: 3 to 20%, Cr:
0.06 to 1%, the balance being Al and unavoidable impurities, and having an intermetallic compound layer having a thickness of 5 μm or less, and on the surface of the intermetallic compound layer, by weight%, Si: 2
~ 13%, Fe: 1% or less, Cr: 0.002-0.1
%, Al with the balance Al and unavoidable impurities
An anticorrosive steel sheet for fuel tanks having excellent corrosion resistance and weldability, characterized by having a system coating layer.

【００１２】（２）被めっき鋼板の表面に、その平均組
成が重量％で、Ｆｅ：２５〜５０％、Ｓｉ：３〜２０
％、Ｃｒ：０．０６〜１％、残部がＡｌおよび不可避的
不純物からなり、かつ厚みが５μｍ以下である金属間化
合物層を有し、前記金属間化合物層の表面に、重量％
で、Ｓｉ：２〜１３％、Ｆｅ：１％以下、Ｃｒ：０．０
０２〜０．１％未満と、さらにＣａ，Ｍｇ，Ｔｉ，Ｂ，
Ｃｏ，Ｎｉ，Ｃｕ，Ｙ，Ｚｒ，Ｎｂ，Ｍｏの１種または
２種以上を合計で０．０１〜０．３％含有し、残部がＡ
ｌおよび不可避的不純物からなるＡｌ系被覆層を有する
ことを特徴とする耐食性、溶接性に優れた燃料タンク用
防錆鋼板。(2) On the surface of the steel sheet to be plated, the average composition is wt%, Fe: 25 to 50%, Si: 3 to 20
%, Cr: 0.06 to 1%, the balance consisting of Al and unavoidable impurities, and having an intermetallic compound layer having a thickness of 5 μm or less, and a weight% on the surface of the intermetallic compound layer.
Then, Si: 2 to 13%, Fe: 1% or less, Cr: 0.0
02 to less than 0.1%, further Ca, Mg, Ti, B,
0.01 to 0.3% in total of one or more of Co, Ni, Cu, Y, Zr, Nb and Mo, with the balance being A
A corrosion-resistant steel sheet for fuel tanks having excellent corrosion resistance and weldability, which has an Al-based coating layer composed of 1 and unavoidable impurities.

【００１３】 （３）被めっき鋼板中に、Ｂ：２〜３０
ｐｐｍを含有することを特徴とする前記（１）または
（２）に記載の耐食性、溶接性に優れた燃料タンク用防
錆鋼板。 （４）被めっき鋼板中のＣｒ量が、０．０１％以上０．
５％未満であることを特徴とする前記（１）〜（３）に
記載の耐食性、溶接性に優れた燃料タンク用防錆鋼板。 （５）Ａｌ系被覆層の表面に、金属Ｃｒ換算で１０〜１
５０ｍｇ／ｍ2 のクロメート皮膜を有することを特徴と
する前記（１）〜（４）に記載の耐食性、溶接性に優れ
た燃料タンク用防錆鋼板。(3) B: 2-30 in the steel plate to be plated
The corrosion-resistant steel sheet for a fuel tank having excellent corrosion resistance and weldability according to the above (1) or (2), which contains ppm. (4) The Cr content in the steel plate to be plated is 0.01% or more .
It is less than 5%, and the corrosion-resistant steel sheet for a fuel tank is excellent in corrosion resistance and weldability according to the above (1) to (3). (5) 10 to 1 in terms of metallic Cr on the surface of the Al-based coating layer
A corrosion preventive steel sheet for a fuel tank having excellent corrosion resistance and weldability according to the above (1) to (4), which has a chromate film of 50 mg / m 2 .

【００１４】（６）鋼板の少なくとも片面の最表層に有
機樹脂層を有することを特徴とする前記（１）〜（５）
に記載の耐食性、溶接性に優れた燃料タンク用防錆鋼
板。 （７）Ａｌ系被覆層と合金層の合計被覆量が、片面当た
り２０〜６０ｇ／ｍ2 であることを特徴とする前記
（１）〜（６）に記載の耐食性、溶接性に優れた燃料タ
ンク用防錆鋼板にある。(6) The above-mentioned (1) to (5), wherein the steel sheet has an organic resin layer on the outermost surface of at least one surface.
Corrosion-resistant steel plate for fuel tanks with excellent corrosion resistance and weldability. (7) The fuel having excellent corrosion resistance and weldability according to the above (1) to (6), wherein the total coating amount of the Al-based coating layer and the alloy layer is 20 to 60 g / m 2 per side. It is on the rustproof steel plate for tanks.

【００１５】次に本発明の数値の限定理由について説明
する。まず合金層とＡｌ系被覆層の限定理由を説明す
る。 Ｆｅ：本発明は、Ａｌ系めっきを溶融めっきで行うもの
であり、合金層（金属間化合物被覆層）は被めっき鋼板
とめっき浴との反応物となる。またＡｌめっき浴中に
は、若干のＦｅを含有するのが普通であり、Ａｌ系被覆
層中も不可避的にＦｅを含有する。通常の溶融Ａｌめっ
き条件でのＡｌ系被覆層中のＦｅ濃度は１％以下であ
り、また生成する合金層のＦｅの範囲は通常２５〜５０
％程度である。従ってそれぞれこの範囲に限定する。Next, the reason for limiting the numerical values of the present invention will be described. First, the reasons for limiting the alloy layer and the Al-based coating layer will be described. Fe: In the present invention, Al-based plating is performed by hot dip plating, and the alloy layer (intermetallic compound coating layer) is a reaction product between the steel sheet to be plated and the plating bath. Further, the Al plating bath usually contains some Fe, and the Al-based coating layer also contains Fe inevitably. The Fe concentration in the Al-based coating layer under the normal hot-dip Al plating conditions is 1% or less, and the range of Fe in the produced alloy layer is usually 25 to 50.
%. Therefore, each is limited to this range.

【００１６】Ｓｉ：溶融Ａｌめっきにおいて、通常合金
層の成長を抑制するためにＳｉを添加する。このため、
Ａｌ系被覆層、合金層中にもＳｉが含有される。Ｓｉ量
が少なすぎると前記した合金層の成長抑制効果が無くな
り、一方多すぎると耐食性を阻害する。従って好ましい
添加量はＡｌ系被覆層で２〜１３％、合金層で３〜２０
％である。Si: In molten Al plating, Si is usually added to suppress the growth of the alloy layer. For this reason,
Si is also contained in the Al-based coating layer and the alloy layer. If the amount of Si is too small, the effect of suppressing the growth of the alloy layer described above is lost, while if it is too large, the corrosion resistance is impaired. Therefore, the preferable addition amount is 2 to 13% in the Al-based coating layer and 3 to 20 in the alloy layer.
%.

【００１７】Ｃｒ：Ｃｒは本発明の要点となる元素で、
Ａｌ系被覆層中に０．００２〜０．１％未満、合金層中
に０．０６〜１％とする。Ｃｒは耐食性に大きく寄与す
る元素で、特に合金層中への添加に意味がある。この効
果を奏するに必要な含有量の下限は、合金層で０．０６
％で、このときのＡｌ系被覆層中の含有量は０．００２
％である。Ｃｒの含有量は多い方が望ましいが、溶融め
っきプロセスにおいては添加することが困難で、実質上
の上限はＡｌ系被覆層において０．１％に満たず、合金
層で１％である。Cr: Cr is an element which is the main point of the present invention,
It is 0.002 to less than 0.1% in the Al-based coating layer and 0.06-1% in the alloy layer. Cr is an element that greatly contributes to corrosion resistance, and is particularly important for addition to the alloy layer. The lower limit of the content necessary for achieving this effect is 0.06 in the alloy layer.
%, And the content in the Al-based coating layer at this time is 0.002
%. It is desirable that the content of Cr is large, but it is difficult to add Cr in the hot dip plating process, and the practical upper limit is less than 0.1% in the Al-based coating layer and 1% in the alloy layer.

【００１８】合金層は金属間化合物のため非常に脆性で
あり、厚みが増大すると内部で破壊され、めっき剥離を
惹起する。自動車燃料タンクのような加工の厳しい用途
において良好な加工性を確保するには厚みが５μｍ以下
であることが必要である。薄い方が好ましいが、実際上
１μｍ以下にするのは困難である。更に、Ａｌ系被覆層
中にＣａ，Ｍｇ，Ｔｉ，Ｂ，Ｃｏ，Ｎｉ，Ｃｕ，Ｙ，Ｚ
ｒ，Ｎｂ，Ｍｏの１種または２種以上を合計で０．０１
〜０．３％含有することも可能である。これらの元素は
いずれもＡｌ系被覆層の耐食性向上に寄与するが、その
効果は比較的小さい。効果を表す下限濃度は０．０１％
で、またその効果が飽和することから上限を０．３％と
する。Since the alloy layer is an intermetallic compound, it is very brittle, and if the thickness increases, the alloy layer will be internally broken and the plating will be peeled off. The thickness is required to be 5 μm or less in order to secure good workability in applications with severe processing such as automobile fuel tanks. It is preferable that the thickness is thin, but it is difficult to reduce the thickness to 1 μm or less in practice. Further, in the Al-based coating layer, Ca, Mg, Ti, B, Co, Ni, Cu, Y, Z
One or two or more of r, Nb and Mo in total of 0.01
It is also possible to contain ~ 0.3%. All of these elements contribute to improving the corrosion resistance of the Al-based coating layer, but the effect is relatively small. The lower limit concentration to show the effect is 0.01%
However, since the effect is saturated, the upper limit is set to 0.3%.

【００１９】 次に被めっき鋼板（母材）の鋼成分の限
定理由について説明する。 Ｂ：Ｂは一般的に鋼板の粒界強度を向上させる元素であ
り、めっき鋼板のめっきの粒界侵入を抑制することも知
られている。本発明においてもＢを添加することが可能
で、これにより溶接部の靱性を向上させることができ、
また二次加工性等にも効果がある。これらの効果を得る
には２ｐｐｍ以上の添加が必要で、一方大量の添加は、
延性を阻害することから上限を３０ｐｐｍとする。 Ｃｒ：合金層にＣｒを含有させる手段として、鋼中にＣ
ｒを添加することも可能であり、その効果を奏せしめる
には、０．０１％以上添加することが望ましい。また、
鋼中Ｃｒ添加は鋼板の成型性を阻害し、また製造コスト
も著しく増大するため、０．５％未満であることが望ま
しい。Next, the reasons for limiting the steel components of the steel sheet to be plated (base material) will be described. B: B is an element that generally improves the grain boundary strength of the steel sheet, and is also known to suppress the grain boundary penetration of the plated steel sheet. Also in the present invention, B can be added, whereby the toughness of the welded portion can be improved,
It is also effective for secondary workability. To obtain these effects, it is necessary to add 2 ppm or more, while adding a large amount of
Since it impairs ductility, the upper limit is set to 30 ppm. Cr: As a means for containing Cr in the alloy layer, C in steel
Ri also possible der be added to r, allowed to response rates and the effect
It is desirable to add 0.01% or more. Also,
Since the addition of Cr in steel impairs the formability of the steel sheet and significantly increases the manufacturing cost, it is desirable to be less than 0.5%.

【００２０】次にめっきの後処理の限定理由を説明す
る。一般に溶接性には最表層の接触抵抗の影響が大きい
ことが知られ、従って種々の後処理によって溶接性は影
響を受ける。また塗装後の耐食性等にも影響を及ぼす。
本発明においては後処理として、Ａｌ系被覆層の表面
に、金属Ｃｒ換算で１０〜１５０ｍｇ／ｍ2 のクロメー
ト皮膜を施すことが望ましい。あるいは鋼板の少なくと
も片面の最表層を有機樹脂層とすることが望ましい。Next, the reasons for limiting the post-treatment of plating will be described. It is generally known that the contact resistance of the outermost layer has a large effect on the weldability, and therefore the weldability is affected by various post treatments. It also affects the corrosion resistance after painting.
In the present invention, as a post-treatment, it is desirable to apply a chromate film of 10 to 150 mg / m 2 in terms of metallic Cr on the surface of the Al-based coating layer. Alternatively, it is desirable that the outermost surface layer of at least one surface of the steel sheet is an organic resin layer.

【００２１】クロメート皮膜としては、通常のクロム酸
系、クロム酸−シリカ系のものは勿論、これにリン酸や
有機樹脂を加えたものでもよい。更に樹脂濃度を高めて
樹脂クロメートとしたものも可能である。このときのク
ロメート付着量が、金属Ｃｒ換算で１０ｍｇ／ｍ2 未満
では溶接性の改善に効果が無く、一方１５０ｍｇ／ｍ 2
超の処理は効果が飽和すると共に、処理するのが困難で
生産性の低下を伴う。更に最表層を有機樹脂層とするこ
とも溶接性向上に効果がある。この時下地にクロメート
をすることがより望ましい。有機樹脂の樹脂系、膜厚は
特に限定しないが、通常のエポキシ，アクリル，ポリエ
ステル，ポリエチレン系等の皮膜が可能で、膜厚は０．
１〜２μｍ程度が好ましい。As the chromate film, ordinary chromic acid is used.
System, chromic acid-silica type, of course, phosphoric acid or
It may be one to which an organic resin is added. Further increase the resin concentration
A resin chromate is also possible. Ku at this time
Lomate adhesion amount is 10 mg / m in terms of metal Cr2 Less than
Has no effect on improving weldability, while 150 mg / m 2 
The treatment of super is saturated with the effect and difficult to treat
It is accompanied by a decrease in productivity. Furthermore, the outermost layer should be an organic resin layer.
Both are effective in improving weldability. Chromate on the base at this time
Is more desirable. Resin system of organic resin, film thickness
Although not particularly limited, ordinary epoxy, acrylic, and polyester
It can be made of stell, polyethylene, etc.
It is preferably about 1 to 2 μm.

【００２２】最後にめっきの付着量の限定理由を説明す
る。本発明は冒頭説明したように、溶接性と耐食性を高
度で両立する材料であり、この両特性は付着量の影響が
大きい。本発明ではＡｌ系被覆層と金属間化合物層の合
計被覆量（以降めっき付着量と称する）を、片面当たり
２０〜６０ｇ／ｍ2 に限定する。本発明は従来に比べて
めっきの耐食性を向上させたもので、より薄い付着量で
耐食性を確保できるが、溶融めっきプロセスで製造可能
な下限の付着量が２０ｇ／ｍ2 程度であり、これを下限
値とする。また付着量が増大すると溶接性が低下するこ
とから、上限を６０ｇ／ｍ2 とする。Finally, the reason for limiting the amount of plating adhered will be described. As described at the beginning, the present invention is a material that achieves both high weldability and high corrosion resistance, and these two properties are greatly affected by the amount of adhesion. In the present invention, the total coating amount of the Al-based coating layer and the intermetallic compound layer (hereinafter referred to as the coating deposition amount) is limited to 20 to 60 g / m 2 per side. The present invention improves the corrosion resistance of the plating as compared with the conventional one, and the corrosion resistance can be secured with a thinner adhesion amount, but the lower limit adhesion amount that can be produced by the hot dip plating process is about 20 g / m 2 , Set to the lower limit. Further, since the weldability decreases as the adhesion amount increases, the upper limit is set to 60 g / m 2 .

【００２３】本発明において、被めっき鋼板の鋼成分は
ＢとＣｒ以外は特に限定しない。しかし高度な加工性を
要求される用途であるため、鋼成分はＩＦ鋼の適用が望
ましい。まためっきの後処理として、ゼロスパングル処
理、焼鈍、調質圧延等が付与されることがあるが、これ
らについては特に限定しない。本発明では、合金層にＣ
ｒを添加することが重要な要件となっている。Ｃｒの添
加方法については特に限定しないが、考え得る方法とし
て浴中へのＣｒ添加、Ｃｒ系プレめっきの利用、めっき
後の溶融段階でのＣｒ吹き付け等がある。In the present invention, the steel components of the steel sheet to be plated are not particularly limited except B and Cr. However, since it is an application that requires high workability, it is desirable to use IF steel as the steel component. Further, as a post-treatment of plating, zero spangle treatment, annealing, temper rolling, etc. may be applied, but these are not particularly limited. In the present invention, the alloy layer contains C
The addition of r is an important requirement. The method of adding Cr is not particularly limited, but possible methods include addition of Cr into the bath, use of Cr-based pre-plating, and spraying of Cr at the melting stage after plating.

【００２４】次に実施例で本発明をより詳細に説明す
る。 （実施例１）通常の熱延、冷延工程を経た、表１に示す
ような鋼成分の冷延鋼板（板厚０．８ｍｍ）を材料とし
て、溶融Ａｌめっきを行った。溶融Ａｌめっきは無酸化
炉−還元炉タイプのラインを使用し、めっき後ガスワイ
ピング法でめっき付着量を調節し、その後冷却し、ゼロ
スパングル処理を施した。一部の材料にはクロメート処
理を、更にその一部には塗装を行った。この際のめっき
浴組成としてはＡｌ−２％Ｆｅをベース成分とし、Ｃ
ｒ：０．０５，０．１％，Ｓｉ：２，５，８，１０％を
添加した。このときの浴中のＦｅは浴中のめっき機器や
ストリップから供給される不可避のものである。めっき
外観は不めっき等なく良好であった。このときの製造条
件を表２に示す。めっき付着量は両面均一で、表示は両
面の付着量とした。このようにして製造した溶融Ａｌめ
っき鋼板の燃料タンクとしての性能を下に示した方法で
評価した。クロメートの種類は、α：クロム酸−シリカ
系，β：樹脂クロメート（乾燥重量比で、樹脂／クロム
＝８：アクリル系樹脂）の２種類を使用し、塗装はエポ
キシ系の樹脂を両面１μｍで処理した。クロメートの付
着量は片面当たりの表示とした。Next, the present invention will be described in more detail with reference to Examples. (Example 1) A hot-rolled steel sheet and a cold-rolled steel sheet having a steel composition as shown in Table 1 (sheet thickness 0.8 mm) which had been subjected to normal hot rolling and cold rolling were used as materials for hot-dip Al plating. For hot dip Al plating, a non-oxidizing furnace-reducing furnace type line was used. After plating, the coating amount was adjusted by a gas wiping method, followed by cooling and zero spangle treatment. Some materials were chromated and some were painted. As the plating bath composition at this time, Al-2% Fe as a base component and C
r: 0.05, 0.1% and Si: 2, 5, 8, 10% were added. The Fe in the bath at this time is unavoidable supplied from plating equipment and strips in the bath. The plating appearance was good with no plating. Table 2 shows the manufacturing conditions at this time. The amount of plating applied was uniform on both sides, and the indication was the amount of adhesion on both sides. The performance of the thus-produced hot-dip Al-plated steel sheet as a fuel tank was evaluated by the method shown below. Two types of chromate are used: α: chromic acid-silica type, β: resin chromate (dry weight ratio, resin / chromium = 8: acrylic type resin), and coating is epoxy type resin with 1 μm on both sides. Processed. The amount of chromate adhered is indicated on each side.

【００２５】[0025]

【表１】 [Table 1]

【００２６】[0026]

【表２】 [Table 2]

【００２７】（１）めっき層、合金層組成、厚み分析方
法 めっき層：３％ＮａＯＨ＋１％ＡｌＣｌ3 ・６Ｈ2 Ｏ
中で低電流電解剥離によりめっき層のみを剥離してめっ
き層組成分析液として、各元素の定量分析を行った。な
お、クロメート処理した後分析する場合には、クロメー
ト中のＣｒの影響をなくすため、表面を研磨，腐食等す
る必要がある。 合金層：上記の電解剥離後、２０％化成ソーダで合金
層を剥離して合金層組成分析液を得、各元素の定量分析
を行った。 合金層厚み：４００倍の断面検鏡写真より合金層厚み
を測定した。(1) Plating layer, alloy layer composition, thickness analysis method Plating layer: 3% NaOH + 1% AlCl 3 .6H 2 O
Only the plating layer was peeled off by low-current electrolytic peeling, and each element was quantitatively analyzed as a plating layer composition analysis liquid. In the case of analysis after chromate treatment, it is necessary to polish or corrode the surface in order to eliminate the influence of Cr in chromate. Alloy layer: After the above electrolytic stripping, the alloy layer was stripped with 20% chemical conversion soda to obtain an alloy layer composition analysis liquid, and quantitative analysis of each element was performed. Alloy layer thickness: The alloy layer thickness was measured from a cross-sectional micrograph of 400 times.

【００２８】（２）限界絞り比 クロメート、塗装を施さないＡｌめっき鋼板を使用し、
塗油のうえ油圧成形試験機により、直径５０ｍｍの円筒
ポンチを用いて、絞り比を変えて成型試験を行い、限界
絞り比を求めた。このときのシワ抑え力は５００ｋｇで
行い、成形性の評価は次の指標によった。 （評価基準） ◎：限界絞り比２．３５以上 〇：限界絞り比２．２０〜２．３０ ×：限界絞り比２．１５以下(2) Limiting draw ratio Chromate, using uncoated Al plated steel sheet,
After applying oil, a forming test was conducted by a hydraulic forming tester using a cylindrical punch having a diameter of 50 mm, and the drawing ratio was changed to obtain the limiting drawing ratio. The wrinkle suppressing force at this time was 500 kg, and the moldability was evaluated according to the following index. (Evaluation Criteria) A: Limiting aperture ratio 2.35 or more O: Limiting aperture ratio 2.20 to 2.30 X: Limiting aperture ratio 2.15 or less

【００２９】（３）溶接性 連続打点性 下に示す溶接条件でスポット溶接を行い、ナゲット径が
４√ｔ（ｔ：板厚）を切った時点までの連続打点数を評
価した。 （溶接条件） 溶接電流：１０ｋＡ 加圧力：２２０ｋｇ 溶接時間：１２サイクル 電極径：６ｍｍ 電極形状：ドーム型 （評価基準） ◎：連続打点１０００点超 〇：連続打点４００〜１０００点 ×：連続打点４００点未満(3) Continuous Weldability Spot welding was performed under the welding conditions shown below, and the number of consecutive spots was evaluated until the nugget diameter fell below 4√t (t: plate thickness). (Welding conditions) Welding current: 10 kA Pressurizing force: 220 kg Welding time: 12 cycles Electrode diameter: 6 mm Electrode shape: Dome type (Evaluation criteria) ◎: Continuous dot more than 1000 points ○: Continuous dot 400 to 1000 points ×: Continuous dot 400 Less than a point

【００３０】溶接部気密性 クランクプレス試験機にて、フランジ幅３０ｍｍ、深さ
２５ｍｍ、７０×７０ｍｍの平底角筒成型を行い、フラ
ンジ部を下に示した溶接条件でシーム溶接を行った。次
にこの一部に穴をあけ、水中でこの穴よりエアを内圧
０．５，１気圧となるように掛け、シーム溶接部からの
エアの漏れを判定した。 （溶接条件） 溶接電流：１０ｋＡ 加圧力：２２０ｋｇ 溶接速度：２．５ｍ／ｓ （評価基準） ◎：溶接部より漏れ発生無し 〇：１気圧で漏れ発生 ×：０．５気圧で漏れ発生Welded portion airtightness A flat bottom square cylinder having a flange width of 30 mm, a depth of 25 mm and a depth of 70 mm was formed using a crank press tester, and the flange portion was seam welded under the welding conditions shown below. Next, a hole was made in this part, and air was applied through this hole so that the internal pressure became 0.5 and 1 atm, and the leakage of air from the seam weld was determined. (Welding conditions) Welding current: 10 kA Pressurizing force: 220 kg Welding speed: 2.5 m / s (Evaluation criteria) ◎: No leakage from welded part 〇: Leakage occurred at 1 atm ×: Leakage occurred at 0.5 atm

【００３１】（４）耐食性評価 内面耐食性 ガソリンに対する耐食性を評価した。方法は上記の油圧
成形試験機により、フランジ幅２０ｍｍ、直径５０ｍ
ｍ、深さ２５ｍｍの平底円筒絞り加工を施した試料に、
試験液を入れ、シリコンゴム製のリングを介してガラス
で蓋をした。この試験後の腐食状況を目視判定した。 （試験条件） 試験液 ：ガソリン＋蒸留水１０％＋蟻酸２００ｐｐｍ 試験期間：４０℃で３ケ月放置 （評価基準） ◎：赤錆発生０．１％未満 〇：赤錆発生０．１〜５％あるいは白錆あり ×：赤錆発生５％超あるいは白錆顕著(4) Corrosion resistance evaluation Internal corrosion resistance The corrosion resistance to gasoline was evaluated. The method is the above-mentioned hydraulic forming tester, the flange width is 20 mm, the diameter is 50 m
m, 25 mm deep flat-bottomed cylindrical sample,
The test solution was put in, and the glass was covered with a silicone rubber ring. The state of corrosion after this test was visually judged. (Test conditions) Test liquid: Gasoline + distilled water 10% + formic acid 200 ppm Test period: Left at 40 ° C for 3 months (Evaluation criteria) ◎: Red rust occurrence less than 0.1% ◯: Red rust occurrence 0.1-5% or white There is rust x: Red rust generation exceeds 5% or white rust is remarkable

【００３２】外面耐食性 寸法７０×１５０ｍｍの試料に対してＪＩＳ Ｚ ２３
７１に準拠した塩水噴霧試験を３０日行い、腐食生成物
を剥離して腐食減量を測定した。この腐食減量の表示は
めっき片面に対しての値である。 （評価基準） ◎：腐食減量１５ｇ／ｍ2 未満 〇：腐食減量１５〜２５ｇ／ｍ2 ×：腐食減量２５ｇ／ｍ2 超JIS Z 23 is applied to a sample having an outer surface corrosion resistance dimension of 70 × 150 mm.
The salt spray test based on No. 71 was performed for 30 days, the corrosion product was peeled off, and the corrosion weight loss was measured. This indication of corrosion weight loss is a value for one side of the plating. (Evaluation criteria) ◎: less corrosion loss 15 g / m 2 ○: corrosion weight loss 15-25 g / m 2 ×: corrosion weight loss 25 g / m 2 greater

【００３３】比較例２９、３０のように、Ａｌ系被覆
層、合金層のＣｒ含有量が足りない時には、耐食性に劣
り、また比較例３１、３２のように、合金層が厚い場合
には、加工性に劣る。本発明例の中でも、鋼中ＢやＣｒ
が多かったり、合金層が厚いと加工性に劣る傾向にあ
り、付着量が多かったり、めっき後に有機系の処理をし
ないと、連続打点性に劣る傾向にある。また鋼中Ｂが少
ないと、溶接気密性に欠ける傾向がある。When the content of Cr in the Al-based coating layer or alloy layer is insufficient as in Comparative Examples 29 and 30, the corrosion resistance is poor, and when the alloy layer is thick as in Comparative Examples 31 and 32, Inferior in workability. Among the examples of the present invention, B in steel and Cr
If the amount is large or the alloy layer is thick, the workability tends to be inferior. If the amount of adhesion is large, or the organic treatment is not performed after plating, the continuous dot-forming property tends to be inferior. Further, when the amount of B in the steel is small, the weld airtightness tends to be poor.

【００３４】（実施例２）めっき原板として、表１のＢ
を使用し、Ａｌめっき浴中にＣａ，Ｍｇ，Ｔｉ，Ｂ，Ｃ
ｏ，Ｎｉ，Ｃｕ，Ｙ，Ｚｒ，Ｎｂ，Ｍｏを適宜添加し、
他の条件は実施例１と同一にしてＡｌめっきを行った。
めっき後の処理は実施例１のβで、金属Ｃｒ換算４０ｍ
ｇ／ｍ2 とした。Ａｌ系被覆層、合金層の他の分析値は
表３に示す。性能評価もやはり実施例１と同様の方法で
行ったが、上記の元素を添加することで、やや耐食性の
向上が認められた。 （Ａｌ系被覆層） Ｓｉ：７．８，Ｆｅ：０．３２，Ｃｒ：０．０３，他：
Ａｌ，付着量：３０ｇ／ｍ2 （片面） （合金層） Ｓｉ：１２．４，Ｆｅ：３５．２，Ｃｒ：０．１９，厚
み：２．２μｍ(Example 2) As a plating original plate, B in Table 1 was used.
Is used in the Al plating bath, Ca, Mg, Ti, B, C
o, Ni, Cu, Y, Zr, Nb, Mo are added appropriately,
Other conditions were the same as in Example 1 and Al plating was performed.
The treatment after plating is β in Example 1 and is 40 m in terms of metal Cr.
It was set to g / m 2 . Table 3 shows other analysis values of the Al-based coating layer and the alloy layer. Performance evaluation was also carried out by the same method as in Example 1, but it was confirmed that the corrosion resistance was slightly improved by adding the above elements. (Al-based coating layer) Si: 7.8, Fe: 0.32, Cr: 0.03, etc .:
Al, adhesion amount: 30 g / m 2 (one side) (alloy layer) Si: 12.4, Fe: 35.2, Cr: 0.19, thickness: 2.2 μm

【００３５】[0035]

【表３】 [Table 3]

【００３６】（実施例３）実施例１の表１のＢを材料と
して、サージェント浴（１００ｇ／ｌＣｒＯ3 ＋１ｇ／
ｌＨ2 ＳＯ4 ）を使用して、付着量片面０．５〜２ｇ／
ｍ2 でＣｒめっきを行い、しかる後溶融Ａｌめっきを行
った。その他の条件は実施例１と同一である。性能評価
は実施例１と同様の方法とした。分析値を表４に、また
性能評価結果を表５にまとめる。このように製造したＡ
ｌめっき鋼板も良好な性能を示す。Example 3 Using B in Table 1 of Example 1 as a material, a Sargent bath (100 g / l CrO 3 +1 g /
1H 2 SO 4 ), and the amount of adhesion on one side is 0.5 to 2 g /
Cr plating was performed at m 2 and then hot dip Al plating was performed. Other conditions are the same as in Example 1. The performance evaluation was performed in the same manner as in Example 1. The analytical values are summarized in Table 4, and the performance evaluation results are summarized in Table 5. A produced in this way
The l-plated steel sheet also shows good performance.

【００３７】[0037]

【表４】 [Table 4]

【００３８】[0038]

【表５】 [Table 5]

【００３９】[0039]

【発明の効果】本発明により、自動車燃料タンク材料と
して要求される、溶接性と耐食性の高度なバランスが可
能となり、この用途に最適な防錆鋼板を提供することが
できた。今後Ｐｂ系材料が環境問題で使用困難となった
ときの新しい燃料タンク材として非常に有望であり、産
業上の寄与も大きい。Industrial Applicability According to the present invention, it is possible to provide a high balance between weldability and corrosion resistance required for automobile fuel tank materials, and it is possible to provide a rust-preventing steel sheet which is optimum for this application. In the future, Pb-based materials are very promising as new fuel tank materials when they become difficult to use due to environmental problems, and they also make a great contribution to industry.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 武井 秀一 福岡県北九州市戸畑区飛幡町１番１号 新日本製鐵株式会社 八幡製鐵所内 (56)参考文献 特開 平９−53166（ＪＰ，Ａ) 特開 平８−325694（ＪＰ，Ａ) 特開 平９−156027（ＪＰ，Ａ) 特開 平８−319550（ＪＰ，Ａ) 特開 平２−88754（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 2/00 - 2/40 C23C 28/00 B05D 7/14 B32B 15/01 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Takei 1-1 Tobahata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Co., Ltd. Yawata Works (56) Reference JP-A-9-53166 (JP, A) JP-A-8-325694 (JP, A) JP-A-9-156027 (JP, A) JP-A-8-319550 (JP, A) JP-A-2-88754 (JP, A) (58) Survey Areas (Int.Cl. 7 , DB name) C23C 2/00-2/40 C23C 28/00 B05D 7/14 B32B 15/01

Claims (7)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 被めっき鋼板の表面に、その平均組成が
重量％で、Ｆｅ：２５〜５０％、Ｓｉ：３〜２０％、Ｃ
ｒ：０．０６〜１％、残部がＡｌおよび不可避的不純物
からなり、かつ厚みが５μｍ以下である金属間化合物層
を有し、前記金属間化合物層の表面に、重量％で、Ｓ
ｉ：２〜１３％、Ｆｅ：１％以下、Ｃｒ：０．００２〜
０．１％未満、残部がＡｌおよび不可避的不純物からな
るＡｌ系被覆層を有することを特徴とする耐食性、溶接
性に優れた燃料タンク用防錆鋼板。1. The surface of a steel sheet to be plated has an average composition of wt%: Fe: 25 to 50%, Si: 3 to 20%, C
r: 0.06 to 1%, the balance consisting of Al and unavoidable impurities, and having an intermetallic compound layer having a thickness of 5 μm or less, on the surface of the intermetallic compound layer, by weight%, S
i: 2 to 13%, Fe: 1% or less, Cr: 0.002 to
An anticorrosive steel sheet for fuel tank having excellent corrosion resistance and weldability, which has an Al-based coating layer containing less than 0.1% and the balance being Al and inevitable impurities. 【請求項２】 被めっき鋼板の表面に、その平均組成が
重量％で、Ｆｅ：２５〜５０％、Ｓｉ：３〜２０％、Ｃ
ｒ：０．０６〜１％、残部がＡｌおよび不可避的不純物
からなり、かつ厚みが５μｍ以下である金属間化合物層
を有し、前記金属間化合物層の表面に、重量％で、Ｓ
ｉ：２〜１３％、Ｆｅ：１％以下、Ｃｒ：０．００２〜
０．１％未満と、さらにＣａ，Ｍｇ，Ｔｉ，Ｂ，Ｃｏ，
Ｎｉ，Ｃｕ，Ｙ，Ｚｒ，Ｎｂ，Ｍｏの１種または２種以
上を合計で０．０１〜０．３％含有し、残部がＡｌおよ
び不可避的不純物からなるＡｌ系被覆層を有することを
特徴とする耐食性、溶接性に優れた燃料タンク用防錆鋼
板。2. The surface of a steel sheet to be plated has an average composition of wt%, Fe: 25 to 50%, Si: 3 to 20%, C
r: 0.06 to 1%, the balance consisting of Al and unavoidable impurities, and having an intermetallic compound layer having a thickness of 5 μm or less, on the surface of the intermetallic compound layer, by weight%, S
i: 2 to 13%, Fe: 1% or less, Cr: 0.002 to
If less than 0.1%, Ca, Mg, Ti, B, Co,
One or more of Ni, Cu, Y, Zr, Nb, and Mo are contained in a total amount of 0.01 to 0.3%, and the balance has an Al-based coating layer composed of Al and unavoidable impurities. Anti-corrosion steel sheet for fuel tanks with excellent corrosion resistance and weldability. 【請求項３】 被めっき鋼板中に、Ｂ：２〜３０ｐｐｍ
を含有することを特徴とする請求項１または請求項２に
記載の耐食性、溶接性に優れた燃料タンク用防錆鋼板。3. B: 2 to 30 ppm in the steel plate to be plated
The rust-preventive steel sheet for a fuel tank having excellent corrosion resistance and weldability according to claim 1 or 2, further comprising: 【請求項４】 被めっき鋼板中のＣｒ量が、０．０１％
以上０．５％未満であることを特徴とする請求項１〜請
求項３に記載の耐食性、溶接性に優れた燃料タンク用防
錆鋼板。4. The Cr content in the plated steel sheet is 0.01%.
It is above 0.5% and less than 0.5%, and the corrosion-resistant steel plate for fuel tanks excellent in corrosion resistance and weldability according to claim 1. 【請求項５】 Ａｌ系被覆層の表面に、金属Ｃｒ換算で
１０〜１５０ｍｇ／ｍ2 のクロメート皮膜を有すること
を特徴とする請求項１〜請求項４に記載の耐食性、溶接
性に優れた燃料タンク用防錆鋼板。5. The excellent corrosion resistance and weldability according to claim 1, wherein the surface of the Al-based coating layer has a chromate film of 10 to 150 mg / m 2 in terms of metallic Cr. Anti-rust steel plate for fuel tank. 【請求項６】 鋼板の少なくとも片面の最表層に有機樹
脂層を有することを特徴とする請求項１〜請求項５に記
載の耐食性、溶接性に優れた燃料タンク用防錆鋼板。6. The rust preventive steel sheet for a fuel tank excellent in corrosion resistance and weldability according to claim 1, wherein an organic resin layer is provided on at least one outermost surface of the steel sheet. 【請求項７】 Ａｌ系被覆層と合金層の合計被覆量が、
片面当たり２０〜６０ｇ／ｍ2 であることを特徴とする
請求項１〜請求項６に記載の耐食性、溶接性に優れた燃
料タンク用防錆鋼板。7. The total coating amount of the Al-based coating layer and the alloy layer is
It is 20-60 g / m < 2 > per one side, The corrosion-resistant steel plate for fuel tanks excellent in corrosion resistance and weldability according to claim 1.
JP31985797A 1997-11-20 1997-11-20 Corrosion-resistant steel plates for fuel tanks with excellent corrosion resistance and weldability Expired - Fee Related JP3485457B2 (en)

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JP4199404B2 (en) * 1999-03-15 2008-12-17 新日本製鐵株式会社 High corrosion resistance plated steel sheet
JP4267184B2 (en) * 1999-06-29 2009-05-27 新日本製鐵株式会社 Hot-dip aluminized steel sheet with excellent corrosion resistance and appearance and manufacturing method thereof
JP4518607B2 (en) * 2000-01-31 2010-08-04 日新製鋼株式会社 Aluminum-plated steel sheet with excellent corrosion resistance
JP5005254B2 (en) * 2006-05-15 2012-08-22 新日本製鐵株式会社 Al-plated steel for hot pressing with excellent temperature rise characteristics, workability, and post-coating corrosion resistance
JP4860537B2 (en) * 2007-04-10 2012-01-25 新日本製鐵株式会社 Automotive parts with excellent corrosion resistance at joints
JP2009120942A (en) * 2007-10-24 2009-06-04 Nippon Steel Corp Aluminum alloy plated steel sheet having excellent cut edge face corrosion resistance and worked part corrosion resistance
JP2009120943A (en) * 2007-10-24 2009-06-04 Nippon Steel Corp Aluminum-based alloy plated steel sheet having excellent oxidation resistance and spot weldability
JP5835268B2 (en) * 2013-04-18 2015-12-24 新日鐵住金株式会社 Plated steel sheet and fuel tank for truck and bus fuel tanks
ES2813870T3 (en) 2014-09-05 2021-03-25 Thyssenkrupp Steel Europe Ag Flat steel product with an Al coating, procedure for its manufacture and procedure for the manufacture of a hot-formed constructive element

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