JPH07316763A - Plated steel sheet for precoated steel sheet stock - Google Patents
Plated steel sheet for precoated steel sheet stockInfo
- Publication number
- JPH07316763A JPH07316763A JP11906694A JP11906694A JPH07316763A JP H07316763 A JPH07316763 A JP H07316763A JP 11906694 A JP11906694 A JP 11906694A JP 11906694 A JP11906694 A JP 11906694A JP H07316763 A JPH07316763 A JP H07316763A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- plated
- zinc
- coating film
- spangle
- 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
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、その用途が例えば、家
電機器の外板の如く、美麗な塗装仕上がり性が要求さ
れ、かつ、塗装の耐クラック性が要求される向きに供さ
れる塗装鋼板の素材として好適な亜鉛−アルミニウム系
合金めっき鋼板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to applications in which the coating finish is required to be beautiful and the crack resistance of the coating is required, such as the outer panel of home electric appliances. The present invention relates to a zinc-aluminum alloy plated steel sheet suitable as a material for a steel sheet.
【０００２】[0002]
【従来の技術】溶融めっき法亜鉛−アルミニウム系合金
めっき鋼板は、予め鋼板表面をめっきに適するように清
浄化し、同時に焼鈍により被めっき素材の機械的性質を
調質するための前処理を行った後、鋼板をそのめっき法
に適合する板温としたところで、亜鉛、アルミニウムお
よび目的に応じて少量の硅素、マグネシウム等でなる溶
融めっき浴に通してめっきされ、その直後に目付量調整
を行って製造される。2. Description of the Related Art A hot dip galvanized zinc-aluminum alloy plated steel sheet is cleaned in advance so that the surface of the steel sheet is suitable for plating, and at the same time, a pretreatment is performed by annealing to adjust the mechanical properties of the material to be plated. After that, when the steel plate has a plate temperature suitable for the plating method, it is plated through a hot dip bath consisting of zinc, aluminum and a small amount of silicon, magnesium, etc. depending on the purpose, and immediately after that, the basis weight is adjusted. Manufactured.
【０００３】ここで、亜鉛−アルミニウム系合金鋼板の
めっき層の代表例を表１に示す。Table 1 shows typical examples of plating layers of zinc-aluminum alloy steel sheets.
【０００４】[0004]
【表１】 [Table 1]
【０００５】めっき後のめっき層組成は、一般に表１に
示すタイプＡ、タイプＢの２タイプに大別される。いず
れも亜鉛とアルミニウム合金が主体で成る。また、それ
らのめっき表面は、それぞれ特有の外観を有し、その外
観は主としてスパングルの大きさ、花紋の形状、凹凸の
度合、色調などで決まるが、この外観が、これまでのめ
っき鋼板と異なるため、意匠性を有する鋼板として用い
られることもある。The composition of the plated layer after plating is generally classified into two types, type A and type B, shown in Table 1. Both are mainly composed of zinc and aluminum alloys. In addition, those plated surfaces each have a unique appearance, and the appearance is mainly determined by the size of the spangle, the shape of the flower pattern, the degree of unevenness, the color tone, etc., but this appearance is different from the plated steel sheets up to now. Therefore, it may be used as a steel plate having a design property.
【０００６】また、亜鉛−アルミニウム系合金でなるた
め、アルミニウムの特有の防食機能と亜鉛の特有の防食
機能とを兼備しており、その特性上のメリットが広く一
般に認識されつつある。その結果、従来の溶融亜鉛めっ
き鋼板では充分に適合し得なかった例えば、家電機器の
ヒータ周辺部で特に耐高温耐食性が要求され部品、ある
いは建材等の中で従来以上に耐食性が要求される部材等
に用いられ、その用途が拡大するとともに、その生産量
も増加する傾向にある。Further, since it is made of a zinc-aluminum alloy, it has both the anticorrosion function peculiar to aluminum and the anticorrosion function peculiar to zinc, and the merits of its characteristics are widely recognized. As a result, conventional hot-dip galvanized steel sheets could not be sufficiently adapted, for example, parts around the heater of home appliances that require high-temperature corrosion resistance, or parts that require higher corrosion resistance than construction materials such as building materials. It is used for various purposes such as the above, and its usage tends to expand, and its production amount tends to increase.
【０００７】さらに、最近では、塗装鋼板用素材として
用いられる例もみられるようになっている。そのねらい
は、上述の亜鉛−アルミニウム系合金めっきが有する特
性に、さらに塗膜が有する特性例えば、意匠性あるいは
耐食性をさらに付加して、高付加価値製品を得ようとす
るものである。このような亜鉛−アルミニウム系合金め
っき鋼板を用いた塗装鋼板用素材に関して、特開昭４９
−１１９８３４号公報、特開昭５０−１０４７３１号公
報、特開昭５０−５９２３４号公報、特開昭５０−１３
３９３３号公報、特開昭５０−１３３９３４号公報、特
開昭５０−１３３９３５号公報、特開昭５８−１１７７
１号公報、特開昭５８−１７７４４６号公報、特開昭５
８−１７７４５０号公報、特開昭５８−１８１８５５号
公報、特開平５−１４８６６８号公報などにその製造方
法等が開示されているFurther, recently, some examples are being used as materials for coated steel sheets. The aim is to obtain a high value-added product by further adding the characteristics of the coating film, such as design or corrosion resistance, to the characteristics of the zinc-aluminum alloy plating described above. Regarding a material for a coated steel sheet using such a zinc-aluminum alloy plated steel sheet, Japanese Patent Laid-Open No.
-1119834, JP-A-50-104731, JP-A-50-59234, and JP-A-50-13.
3933, JP-A-50-133934, JP-A-50-133935, JP-A-58-1177.
1, JP-A-58-177446, JP-A-5
No. 8-177450, Japanese Patent Laid-Open No. 58-181855, Japanese Patent Laid-Open No. 148668/1993 disclose the manufacturing method thereof.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、本発明
者らの研究の結果、上記従来の亜鉛−アルミニウム系合
金めっき鋼板を塗装鋼板用素材に用いた場合、以下の問
題点を有することが判った。問題点１として、塗装鋼板
の主要目的のひとつである意匠性、とりわけ最近、特に
冷蔵庫ドア用塗装鋼板などに要求される鮮映性（写像性
と表現される例もある。）が良くない。However, as a result of the research conducted by the present inventors, it has been found that the above-mentioned conventional zinc-aluminum alloy plated steel sheet has the following problems when used as a material for coated steel sheet. . The problem 1 is that the designability, which is one of the main purposes of the coated steel sheet, and particularly the sharpness (sometimes referred to as "image clarity") recently required for the coated steel sheet for refrigerator doors in particular, is not good.
【０００９】問題点２として、亜鉛−アルミニウム系合
金めっき鋼板を素材とする塗装鋼板は、例えば、一般に
行われる折り曲げ加工において、従来の溶融亜鉛めっき
鋼板を素材とるする塗装鋼板に比べ、塗膜にクラック
（亀裂）が入り易い。このため、加工部を中心とした腐
食が起こり易く、本来の目的のひとつである耐食性が損
なわれる。As a problem 2, a coated steel sheet made of a zinc-aluminum alloy plated steel sheet has a better coating film than a coated steel sheet made of a conventional hot-dip galvanized steel sheet, for example, in a commonly performed bending process. Cracks tend to occur. Therefore, corrosion tends to occur mainly in the processed portion, and the corrosion resistance, which is one of the original purposes, is impaired.
【００１０】上記の問題点１および問題点２の解決は、
塗装鋼板にとって重要かつ緊急の課題であるが、これま
でこれらに関する解決手段は開示されていない。そこで
この発明は、このような従来の問題点に着目してなされ
たものであり、塗装鋼板の鮮映性が著しく改善され、か
つ加工による塗膜のクラック発生も著しく抑制できるよ
うな塗装鋼板素材用の溶融法亜鉛−アルミニウム系合金
めっき鋼板を提供することを目的とする。To solve the above problems 1 and 2,
Although it is an important and urgent issue for coated steel sheets, no solution for them has been disclosed so far. Therefore, the present invention has been made by paying attention to such a conventional problem, and the coated steel sheet material is capable of remarkably improving the image clarity of the coated steel sheet and significantly suppressing the occurrence of cracks in the coating film due to processing. It is an object of the present invention to provide a hot-dip zinc-aluminum alloy-plated steel sheet for use in steel.
【００１１】[0011]
【課題を解決するための手段】本発明の発明者らは、前
記問題点を解決するべく研究してきた結果、次のような
知見を得るに至った。まず、亜鉛−アルミニウム系合金
めっき鋼板のめっき表面のスパングルが大きいほど鮮映
性が劣悪となる傾向を有する。便宜的に単位面積当たり
の平均長径と塗装鋼板の鮮映性との関係を求めたとこ
ろ、平均長径が４．５μｍ以上で目立って悪くなること
が判った。Means for Solving the Problems The inventors of the present invention have made the following findings as a result of researches aimed at solving the above problems. First, the larger the spangle on the plated surface of the zinc-aluminum alloy plated steel sheet, the worse the sharpness tends to be. For convenience, the relationship between the average major axis per unit area and the sharpness of the coated steel sheet was determined, and it was found that when the average major axis was 4.5 μm or more, it became noticeably worse.
【００１２】また、表面の微細凹凸パターンを表面粗さ
Ｒａとろ波中心線うねりＷCAで表したとき、両者が鮮映
性に影響し、Ｒａを０．４μｍ未満とし、かつＷCAを
０．３μｍ未満とすることによって、鮮映性が著しく向
上することを見い出した。さらに、スパングルの長径
４．５ｍｍ未満、Ｒａ０．４μｍ未満、ＷCAを０．３μ
ｍ未満とする３つのパラメータを同時に満足する亜鉛−
アルミニウム系合金めっき鋼板を用いた塗装鋼板の鮮映
性はさらに改善されることが判った。Further, when the fine uneven pattern on the surface is expressed by the surface roughness Ra and the filtered center line waviness W CA , both influence the image clarity, Ra is less than 0.4 μm, and W CA is 0. It has been found that when the thickness is less than 3 μm, the sharpness is remarkably improved. Furthermore, spangle long diameter less than 4.5 mm, Ra less than 0.4 μm, W CA 0.3 μ
Zinc that simultaneously satisfies the three parameters of less than m-
It was found that the sharpness of the coated steel sheet using the aluminum-based alloy plated steel sheet was further improved.
【００１３】同様の傾向が、塗装鋼板を折り曲げ加工し
た際の塗膜のクラックの発生程度にも認められることが
判った。It has been found that the same tendency is observed in the degree of cracking of the coating film when the coated steel sheet is bent.
【００１４】[0014]
【作用】本発明によれば、図１に示す如く、亜鉛−アル
ミニウム系合金めっき鋼板のそのめっき面のスパングル
の大きさ（平均長径で表した）、表面粗度Ｒａ及びろ波
中心うねりＷCAの３つのパラメータを規制することによ
って、これを素材とする塗装鋼板の鮮映性を著しく改善
することができる。According to the present invention, as shown in FIG. 1, the zinc-aluminum alloy plated steel sheet has a spangle size (expressed by an average long diameter), a surface roughness Ra and a filtered wave center waviness W CA of its plated surface. By controlling these three parameters, the sharpness of the coated steel sheet using this as a material can be significantly improved.
【００１５】図１から、亜鉛−アルミニウム系合金めっ
き鋼板のスパングルの平均長径が４．５ｍｍ以上にあっ
ては、鮮映性に優れた領域は殆ど存在し得ない。また、
Ｒａが０．５μｍ以上にあっては、スパングルが４．５
ｍｍ未満の小長径でかつ、Ｗ CAが０．３μｍ未満と小さ
い場合であっても鮮映性に優れた領域は殆どない。同様
にＷCAが０．４μｍ以上にあっては、Ｒａが０．４μｍ
未満でかつスパングルの平均長径が４．５ｍｍ未満にあ
っても鮮映性に優れた領域は存在しない。From FIG. 1, zinc-aluminum alloy plating
The average long diameter of the spangle of the steel plate is 4.5 mm or more.
As a result, there is almost no region with excellent image clarity. Also,
When Ra is 0.5 μm or more, spangle is 4.5
Small major diameter less than mm and W CAIs as small as less than 0.3 μm
Even if it is not, there are few areas with excellent image clarity. As well
To WCAIs 0.4 μm or more, Ra is 0.4 μm
And the average long diameter of the spangle is less than 4.5 mm.
However, there is no region with excellent image clarity.
【００１６】すなわち、亜鉛−アルミニウム系合金めっ
き鋼板のめっき表面のスパングルの平均長径を４．５ｍ
ｍ未満とし、表面粗度Ｒａを０．４μｍ未満、ろ波中心
線うねりを０．３μｍ未満とする３つの条件全てを満足
させることによって、はじめて充分に鮮映性の優れた塗
装鋼板を製造することができる。上記鮮映性と３つのパ
ラメータとの関係は、図２及び図３に示すように塗膜の
クラック発生傾向との関係においてもほぼ同様であるこ
とが判っている。That is, the average major axis of spangles on the plated surface of the zinc-aluminum alloy plated steel sheet is 4.5 m.
It is less than m, the surface roughness Ra is less than 0.4 μm, and the filtered center line waviness is less than 0.3 μm. By satisfying all of the three conditions, a coated steel sheet having sufficiently excellent sharpness is manufactured for the first time. be able to. It has been found that the relationship between the above-described image clarity and the three parameters is almost the same as the relationship with the tendency of cracking of the coating film as shown in FIGS. 2 and 3.
【００１７】以上の鮮映性およびクラック発生傾向と３
つのパラメータとの関係について、必ずしも明確ではな
いが、つぎのように考えられる。亜鉛−アルミニウム系
合金めっき鋼板のめっき面のスパングルは、図４ａの如
くなっている。また、スパングルとスパングルとの境す
なわち粒界は図４ｂとなっている。すなわち、スパング
ル１個の中で凹凸があり、粒界部では盛り上がり、粒内
中央部は相対的に凹んで見える。このため、スパングル
の平均長径が大きい場合は、表面の凹凸パターンは平均
的に長波長となり、平均長径が小さい場合は、平均的に
短波長となる。The above-mentioned image clarity and the tendency of cracks to occur and 3
The relationship between the two parameters is not always clear, but it can be considered as follows. The spangle on the plated surface of the zinc-aluminum alloy plated steel sheet is as shown in FIG. 4a. The boundary between the spangles, that is, the grain boundary is shown in FIG. 4b. That is, there is unevenness in one spangle, it rises at the grain boundary portion, and the central portion inside the grain appears to be relatively concave. Therefore, when the average major axis of the spangle is large, the uneven pattern on the surface has an average long wavelength, and when the average major axis is small, the average wavelength is short wavelength.
【００１８】このめっき面に塗装を施した場合について
観察すると、図５ａ、図５ｂに示す如くめっき表面の凹
凸パターンが長波長（スパングルの長径が大きい）の場
合には、塗膜の表面の凹凸も平均的に長波長であり、め
っき表面の凹凸パターンが短波長（スパングルの長径が
小さい）の場合には、塗装表面の凹凸は短波長となって
いる。When observing the case where coating is applied to the plated surface, when the uneven pattern of the plated surface has a long wavelength (the long diameter of the spangle is large) as shown in FIGS. 5a and 5b, the unevenness of the surface of the coating film is observed. Also has a long wavelength on average, and when the uneven pattern on the plating surface has a short wavelength (the long diameter of the spangle is small), the unevenness on the coating surface has a short wavelength.
【００１９】また、長短両波長の山高さは塗装前後で変
化し、いずれも塗装によって山高さは低くなっている
が、その程度は、短波長のほうが大きい。すなわち、短
波長のほうが塗料によって凹みがより小さくなってお
り、塗膜表面はより平滑になる傾向を有することが判
る。一方、表面粗度Ｒａは、よりミクロ的な凹凸度を表
す指標であるが、Ｒａが大きいとそのめっき面のミクロ
的な凹凸を塗膜が完全に隠蔽することができず、短波長
の凹凸が残存することになる。さらに、ろ波中心線うね
りＷCAは、結果的にスパングルの長径のような大きな波
長での凹凸程度と表面粗度Ｒａのような極小さい波長で
の凹凸程度との中間的波長での凹凸程度を表す指標と考
えられ、これが大きいと中間的波長の凹凸は塗膜によっ
て完全に隠蔽することができない。Further, the peak heights of both long and short wavelengths change before and after coating, and the peak heights are lowered by coating in both cases, but the extent is shorter for short wavelengths. That is, it can be seen that the shorter wavelengths have smaller dents due to the coating material, and the coating film surface tends to become smoother. On the other hand, the surface roughness Ra is an index representing a more microscopic unevenness, but when Ra is large, the coating film cannot completely hide the microscopic unevenness of the plated surface, and thus the unevenness of a short wavelength. Will remain. Furthermore, the filtered centerline waviness W CA is the degree of unevenness at an intermediate wavelength between the degree of unevenness at a large wavelength such as the long diameter of the spangle and the degree of unevenness at a very small wavelength such as the surface roughness Ra. It is considered that this is an index that represents, and if this is large, the unevenness of the intermediate wavelength cannot be completely hidden by the coating film.
【００２０】以上のように、本発明の亜鉛−アルミニウ
ムめっき鋼板の優れた鮮映性は、スパングルの長径、表
面粗度Ｒａおよびろ波中心線うねりＷCAの３つのパラメ
ータを各々を規制することによって、異なる３つの波長
領域の凹凸程度を補完し合って、前記結果が達成される
と推察される。また、本発明によれば、塗膜のクラック
の発生も改善されるが、その理由について、以下のよう
に考察される。As described above, the excellent sharpness of the zinc-aluminum plated steel sheet of the present invention is controlled by controlling each of the three parameters of the long diameter of the spangle, the surface roughness Ra and the filtered center line waviness W CA. It is presumed that the above results are achieved by complementing the degree of unevenness in three different wavelength regions. Further, according to the present invention, the occurrence of cracks in the coating film is also improved, and the reason for this is considered as follows.
【００２１】すなわち、折り曲げ加工によりクラックが
発生した塗膜下では、亜鉛−アルミニウム系合金めっき
鋼板のめっき面にもクラックが発生している。また、そ
のクラックは、スパングルとスパングルとの境、すなわ
ち結晶粒界に発生していることが確認された。さらに、
そのクラックの幅は、スパングルの平均長径が大きいほ
ど大きくなる傾向が認められた。That is, under the coating film in which cracks were generated by bending, cracks were also generated in the plated surface of the zinc-aluminum alloy plated steel sheet. In addition, it was confirmed that the crack occurred at the boundary between spangles, that is, at the grain boundary. further,
The width of the crack tended to increase as the average major axis of the spangle increased.
【００２２】このことは、めっき面上の塗膜に対して、
スパングルが大きいほど、結晶粒界周辺の塗膜に大きな
歪を与えることになり、この歪量に対応しきれなくなっ
た塗膜がクラックを発生するものと考えられる。さら
に、表面粗度Ｒａおよびろ波中心線うねりＷCAとクラッ
クの関係について、必ずしも明確でないが、Ｒａおよび
ＷCAが大きいほど、突起の山高さは高くなるために、こ
の山が高いほどその上の塗膜には折り曲げによる応力集
中が起こり易く、その結果として塗膜はクラックを発生
し易くなるものと推察される。This means that for the coating film on the plated surface,
It is considered that the larger the spangle is, the larger the strain is applied to the coating film around the crystal grain boundaries, and the coating film that cannot support the strain amount is cracked. Furthermore, although the relationship between the surface roughness Ra and the filter centerline waviness W CA and the crack is not always clear, the higher Ra and W CA , the higher the peak height of the protrusions. It is presumed that stress concentration due to bending is apt to occur in the coating film (2) and, as a result, the coating film is apt to crack.
【００２３】[0023]
実施例１ 亜鉛−アルミニウム系合金めっき鋼板製造設備として
は、一般的な無酸化炉タイプのゼンジマー法溶融亜鉛め
っき鋼板の営業生産ラインを利用し、その通常用いる溶
融亜鉛めっき浴（亜鉛ポット）に換えて亜鉛−アウミニ
ウム系合金溶融めっき浴を設けたものを使用した。Example 1 As a facility for producing a zinc-aluminum alloy plated steel sheet, a commercial non-oxidizing furnace type Zenzimer process hot dip galvanized steel sheet commercial production line was used, and the hot dip galvanizing bath (zinc pot) was used instead. A zinc-aluminium alloy hot-dip galvanizing bath was used.
【００２４】先ず、通常の鋼板表面の清浄化と焼鈍とを
行った鋼板に亜鉛−アルミニウム系合金をめっきし、目
付量調整を行った直後のめっき鋼板に、空気または水−
空気混合流体を冷媒として吹き付ける。その吹き付けに
際し、単位時間当たりの吹き付け量を変えることによっ
て、スパングルの大きさをコントロールした。次に、こ
うして得られた多様のスパングルの大きさを有するめっ
き鋼板を調質圧延して亜鉛−アルミニウム鋼板を製造す
る。その圧延に際して、予めロール面の表面粗度Ｒａと
うねりＷCAとを変化させたいく種もの調質圧延用ロール
を用意した。それらの多種の圧延用ロールを交互に調質
圧延機に組み込み、さらに圧延荷重を種々変化させ、こ
れらを組合せることによって、スパングルの大きさ、表
面粗度Ｒａ及びうねりＷCAが異なる多様な亜鉛−アルミ
ニウムめっき鋼板を製造した。First, a steel sheet on which a normal steel sheet surface has been cleaned and annealed is plated with a zinc-aluminum alloy, and the coated steel sheet immediately after the adjustment of the basis weight is dried with air or water.
The air mixed fluid is sprayed as a refrigerant. At the time of the spraying, the size of the spangle was controlled by changing the spraying amount per unit time. Next, the plated steel sheet having various spangle sizes thus obtained is temper-rolled to manufacture a zinc-aluminum steel sheet. During the rolling, various types of temper rolling rolls were prepared in which the surface roughness Ra of the roll surface and the waviness W CA were changed in advance. By incorporating these various types of rolling rolls into the temper rolling mill alternately, further changing the rolling load, and combining these, various zincs with different spangle sizes, surface roughness Ra and waviness W CA can be obtained. -Manufactured aluminized steel sheet.
【００２５】こうして得られた多様な亜鉛−アルミニウ
ムめっき鋼板について、スパングル長径とめっき表面の
ＲａおよびＷCAをしれぞれ測定した。さらに、これら亜
鉛−アルミニウムめっき鋼板に塗装下地処理として一般
的なクロメート被膜を形成し、その上にＰＣＭ用塗料を
塗装した後、塗料焼付処理を行って塗装鋼板を製造し
た。With respect to the various zinc-aluminum plated steel sheets thus obtained, the long diameter of spangle and the Ra and W CA of the plated surface were measured. Further, a general chromate film was formed on these zinc-aluminum-plated steel sheets as a coating base treatment, and a paint for PCM was applied thereon, and then a paint baking treatment was performed to manufacture coated steel sheets.
【００２６】これら塗装鋼板につき、鮮映性を測定し、
さらに折り曲げ試験を実施した。表２に、上記の亜鉛−
アルミニウムめっき鋼板の製造条件及びめっき付着量そ
の他のデータの詳細を示した。For these coated steel sheets, the sharpness was measured,
Further, a bending test was carried out. In Table 2, the above zinc-
The details of the production conditions of the aluminum-plated steel sheet, the coating weight, and other data are shown.
【００２７】[0027]
【表２】 [Table 2]
【００２８】また、表３に塗装方法の明細を示した。Table 3 shows the details of the coating method.
【００２９】[0029]
【表３】 [Table 3]
【００３０】さらに、表４には鮮映性の測定方法を示し
た。Further, Table 4 shows the method for measuring the sharpness.
【００３１】[0031]
【表４】 [Table 4]
【００３２】また、表５にはスパングル平均長径、平均
表面粗さＲａ及びろ波中心線うねりＷCAの測定方法を示
した。Table 5 shows the methods for measuring the spangle average major axis, average surface roughness Ra and filtered center line waviness W CA.
【００３３】[0033]
【表５】 [Table 5]
【００３４】上記で得られた、スパングル長径、Ｒａ、
ＷCAの３つのパラメータと鮮映性との関係を図１に示し
た。また、図２にスパングルの平均長径、ＷCAと塗膜ク
ラックの発生傾向との関係を示し、図３にスパングルの
平均長径、Ｒａと塗膜クラックの発生傾向の関係を示し
た。図１、図２および図３から、塗装鋼板の鮮映性およ
び塗膜クラックに改善に対して、本発明が有効であるこ
とは明らかである。The spangle long diameter, Ra,
The relationship between the three parameters of W CA and the image clarity is shown in FIG. Further, FIG. 2 shows the relationship between the average major axis of spangles, W CA and the tendency of coating film cracking, and FIG. 3 shows the relationship between the average major diameter of spangles, Ra and the tendency of coating film cracking. It is clear from FIGS. 1, 2 and 3 that the present invention is effective for improving the sharpness of coated steel sheets and coating cracks.
【００３５】なお、塗膜のクラックは、密着曲げ（ＯＴ
ベンドテスト）後、次の基準で作成した限度見本と比較
して評価した。５（：曲げ部にクラック発生なし）、４
（：ごく小さなクラックが１〜２個認められる）、
３（：小さなクラックが３〜５個ある）、２（：クラッ
クが６〜１０個）、１（：クラックが無数）。 実施例２ 表１に示すタイプＢのめっき組成例のものについて、実
施例１と同様にめっき表面の凹凸パターンとスパングル
の平均長径を変化させ、スパングルの平均長径、ＷCAお
よびＲａと塗装後の鮮映性、塗膜クラックの発生傾向と
の関係を求めた。It should be noted that cracks in the coating film are caused by tight bending (OT
After the bend test), evaluation was performed by comparing with a limit sample prepared according to the following criteria. 5 (: No cracks occur in the bent part), 4
(: 1-2 small cracks are recognized),
3 (: 3 to 5 small cracks), 2 (: 6 to 10 cracks), 1 (: countless cracks). Example 2 For the type B plating composition example shown in Table 1, the uneven pattern of the plating surface and the average major axis of the spangles were changed in the same manner as in Example 1, and the average major axis of the spangles, W CA and Ra The relationship between the sharpness and the tendency of coating film cracking was determined.
【００３６】その結果、図１、図２および図３に示す実
施例１とほぼ同様のスパングルの平均長径、ＷCAおよび
Ｒａの各パラメータと鮮映性、塗膜のクラックの各特性
との関係のあることが確認された。As a result, the relationship between the average major axis of the spangle, each parameter of W CA and Ra, and the sharpness and the characteristics of the crack of the coating film, which are almost the same as those in Example 1 shown in FIGS. 1, 2 and 3, It was confirmed that
【００３７】[0037]
【発明の効果】本発明は、亜鉛−アルミニウム系合金め
っき鋼板のめっき面のスパングル長径と表面粗さＲａと
ろ波中心線うねりＷCAの３つのパラメータを規制するこ
とによって、該鋼板を素材とする塗装鋼板の鮮映性を著
しく改善でき、加工による塗膜のクラック発生も著しく
抑制することができるという効果を奏する。INDUSTRIAL APPLICABILITY The present invention uses the steel sheet as a raw material by controlling three parameters of the spangle long diameter and surface roughness Ra of the zinc-aluminum alloy plated steel sheet and the filtered center line waviness W CA. The image clarity of the coated steel sheet can be remarkably improved, and the cracking of the coating film due to processing can be remarkably suppressed.
【図面の簡単な説明】[Brief description of drawings]
【図１】めっき面のろ波中心線うねりＷCA、表面粗さＲ
ａおよびスパングル長径と塗装鋼板の塗装面の鮮映性と
の関係を示す図である。[Fig.1] Filter center line waviness W CA , surface roughness R of plated surface
It is a figure which shows the relationship between a and a spangle long diameter, and the image clarity of the coated surface of a coated steel plate.
【図２】スパングル長径、ろ波中心線うねりＷCAと塗膜
のクラック発生との関係を示す図である。FIG. 2 is a diagram showing a relationship between a major axis of spangle, filtered center line waviness W CA and crack generation of a coating film.
【図３】スパングル長径、表面粗さＲａと塗膜のクラッ
ク発生との関係を示す図である。FIG. 3 is a diagram showing a relationship between a long diameter of spangle and surface roughness Ra and occurrence of cracks in a coating film.
【図４】めっき面のスパングルとその断面を模式的に示
す図である。FIG. 4 is a diagram schematically showing a spangle of a plated surface and a cross section thereof.
【図５】めっき面の凹凸パターンと塗装面の凹凸パター
ンを示す図である。FIG. 5 is a diagram showing an uneven pattern on a plated surface and an uneven pattern on a coated surface.
Claims (1)
さを長径４．５ｍｍ未満、平均表面粗さＲａを０．４μ
ｍ未満、ろ波中心線うねりＷCAを０．３μｍ未満とする
ことを特徴とする塗装用途の溶融法亜鉛−アルミニウム
系合金めっき鋼板。1. The plating surface has a spangle size of less than 4.5 mm in major axis and an average surface roughness Ra of 0.4 μm.
and a filtered center line waviness W CA of less than 0.3 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11906694A JPH07316763A (en) | 1994-05-31 | 1994-05-31 | Plated steel sheet for precoated steel sheet stock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11906694A JPH07316763A (en) | 1994-05-31 | 1994-05-31 | Plated steel sheet for precoated steel sheet stock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07316763A true JPH07316763A (en) | 1995-12-05 |
Family
ID=14752056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11906694A Pending JPH07316763A (en) | 1994-05-31 | 1994-05-31 | Plated steel sheet for precoated steel sheet stock |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07316763A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003060179A1 (en) * | 2002-01-09 | 2003-07-24 | Nippon Steel Corporation | Zinc-plated steel sheet excellent in corrosion resistance after coating and clarity of coating thereon |
| KR100728893B1 (en) * | 2002-03-08 | 2007-06-15 | 신닛뽄세이테쯔 카부시키카이샤 | Highly corrosion-resistant hot dip metal plated steel product excellent in surface smoothness |
| JP2007254808A (en) * | 2006-03-23 | 2007-10-04 | Jfe Steel Kk | Chromate-free galvanized steel plate having excellent surface appearance |
| JP2008214681A (en) * | 2007-03-01 | 2008-09-18 | Nippon Steel Corp | Galvannealed steel sheet superior in image clarity of coating and press formability, and manufacturing method therefor |
| WO2014084371A1 (en) * | 2012-11-30 | 2014-06-05 | 新日鐵住金株式会社 | Hot dip galvanized steel sheet |
| KR20150061025A (en) * | 2013-03-06 | 2015-06-03 | 아르셀러미탈 인베스티가시온 와이 데살롤로 에스엘 | A method for manufacturing a metal sheet with a znal coating and with optimised drying, corresponding metal sheet, part and vehicle |
-
1994
- 1994-05-31 JP JP11906694A patent/JPH07316763A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100338252C (en) * | 2002-01-09 | 2007-09-19 | 新日本制铁株式会社 | Zinc-plated steel sheet excellent in corrosion resistance after coating and clarity of coating thereon |
| JP2003268519A (en) * | 2002-01-09 | 2003-09-25 | Nippon Steel Corp | Galvanized steel sheet having excellent corrosion resistance after coating and image clarity in coating |
| KR100687825B1 (en) * | 2002-01-09 | 2007-03-02 | 신닛뽄세이테쯔 카부시키카이샤 | Zinc-plated steel sheet excellent in corrosion resistance after coating and clarity of coating thereon |
| US7534502B2 (en) | 2002-01-09 | 2009-05-19 | Nippon Steel Corporation | Zinc-plated steel sheet excellent in corrosion resistance after coating and clarity of coating thereon |
| WO2003060179A1 (en) * | 2002-01-09 | 2003-07-24 | Nippon Steel Corporation | Zinc-plated steel sheet excellent in corrosion resistance after coating and clarity of coating thereon |
| US7238431B2 (en) | 2002-03-08 | 2007-07-03 | Nippon Steel Corporation | Highly corrosion-resistant hot dip plated steel material excellent in surface smoothness |
| KR100728893B1 (en) * | 2002-03-08 | 2007-06-15 | 신닛뽄세이테쯔 카부시키카이샤 | Highly corrosion-resistant hot dip metal plated steel product excellent in surface smoothness |
| JP2007254808A (en) * | 2006-03-23 | 2007-10-04 | Jfe Steel Kk | Chromate-free galvanized steel plate having excellent surface appearance |
| JP2008214681A (en) * | 2007-03-01 | 2008-09-18 | Nippon Steel Corp | Galvannealed steel sheet superior in image clarity of coating and press formability, and manufacturing method therefor |
| WO2014084371A1 (en) * | 2012-11-30 | 2014-06-05 | 新日鐵住金株式会社 | Hot dip galvanized steel sheet |
| JP5960815B2 (en) * | 2012-11-30 | 2016-08-02 | 新日鐵住金株式会社 | Hot-dip galvanized steel sheet and manufacturing method thereof |
| KR20150061025A (en) * | 2013-03-06 | 2015-06-03 | 아르셀러미탈 인베스티가시온 와이 데살롤로 에스엘 | A method for manufacturing a metal sheet with a znal coating and with optimised drying, corresponding metal sheet, part and vehicle |
| US10041162B2 (en) | 2013-03-06 | 2018-08-07 | Arcelormittal | Metal sheet with a ZnAl coating |
| US10119187B2 (en) | 2013-03-06 | 2018-11-06 | Arcelormittal | Deformed part and vehicle |
| US10745790B2 (en) | 2013-03-06 | 2020-08-18 | Arcelormittal | Method for manufacturing a metal sheet with a ZnAl coating and with optimized wiping, corresponding metal sheet, part and vehicle |
| US11572613B2 (en) | 2013-03-06 | 2023-02-07 | Arcelormittal | Method for manufacturing a metal sheet with a ZnAl coating and with optimized wiping, corresponding metal sheet, part and vehicle |
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