JPH09143679A - Black zinc-magnesium plated steel sheet and its production - Google Patents
Black zinc-magnesium plated steel sheet and its productionInfo
- Publication number
- JPH09143679A JPH09143679A JP32517395A JP32517395A JPH09143679A JP H09143679 A JPH09143679 A JP H09143679A JP 32517395 A JP32517395 A JP 32517395A JP 32517395 A JP32517395 A JP 32517395A JP H09143679 A JPH09143679 A JP H09143679A
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- layer
- steel sheet
- content
- black
- plated steel
- 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.)
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- Physical Vapour Deposition (AREA)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐食性，めっき密着性
に優れ、家電製品のハウジングや部材等として使用され
る黒色Ｚｎ−Ｍｇ系めっき鋼板及びその製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a black Zn-Mg-based plated steel sheet which is excellent in corrosion resistance and plating adhesion and is used as a housing or member of home electric appliances and a method for producing the same.
【０００２】[0002]
【従来の技術】家電，建築等の分野では、黒色の鋼板
は、製品形状に加工した後、塗装を施すことにより黒色
の色調を付与している。また、黒色塗装や黒色処理され
た鋼板を加工することにより、塗装工程を省略してコス
トを削減することも検討されている。鋼板を黒色化する
手段としては、黒色塗料を塗装する外に、Ｚｎめっき鋼
板やＺｎ系めっき鋼板を燐酸塩処理することにより、Ｊ
ＩＳ Ｚ８７３０で規定されている明度指数Ｌ* を３０
〜５０にすることも特願平７−４７８６２号で提案され
ている。2. Description of the Related Art In the fields of home appliances, construction, and the like, black steel sheets are processed into product shapes and then painted to impart a black color tone. It is also considered to reduce the cost by omitting the painting process by processing a black-painted or black-treated steel plate. As a means for blackening a steel sheet, in addition to coating a black paint, a Zn-plated steel sheet or a Zn-based plated steel sheet is treated with a phosphate to obtain a J
The lightness index L * specified by IS Z8730 is 30.
It is also proposed in Japanese Patent Application No. 7-47862 that the value be set to -50.
【０００３】[0003]
【発明が解決しようとする課題】黒色塗料を用いて鋼板
を黒色化する場合、鋼板表面に形成された黒色塗料が太
陽光線を吸収し易く、塗装の耐候性が劣る。また、リン
酸塩処理で黒色化する方法では、無機質のリン酸亜鉛結
晶で黒色化しているため、耐候性が良好であるものの、
明度指数Ｌ* が３０以上であり、良好な色調をもつ黒色
が得られない。また、Ｚｎめっき鋼板を基材として使用
することから、耐食性に劣ることも欠点である。本発明
は、このような問題を解消すべく案出されたものであ
り、Ｚｎ−Ｍｇ系めっき層が黒色化に適した特性を呈す
ることを活用し、耐食性，耐候性に優れ、明度指数Ｌ*
３０以下の色調をもつ黒色Ｚｎ−Ｍｇ系めっき鋼板を提
供することを目的とする。When a steel sheet is blackened using a black paint, the black paint formed on the surface of the steel sheet easily absorbs the sun's rays and the weather resistance of the coating is poor. Further, in the method of blackening by the phosphate treatment, since it is blackened by the inorganic zinc phosphate crystal, although the weather resistance is good,
The lightness index L * is 30 or more, and black having a good color tone cannot be obtained. Further, since the Zn-plated steel sheet is used as the base material, the corrosion resistance is inferior. The present invention has been devised to solve such a problem, and takes advantage of the fact that the Zn-Mg based plating layer has characteristics suitable for blackening, and is excellent in corrosion resistance and weather resistance, and has a lightness index L. *
It is an object to provide a black Zn-Mg-based plated steel sheet having a color tone of 30 or less.
【０００４】[0004]
【課題を解決するための手段】本発明の黒色Ｚｎ−Ｍｇ
系めっき鋼板は、その目的を達成するため、めっき層の
最表層にＭｇ（ＯＨ）2 ，ＺｎＯ及びＺｎからなる層を
形成しており、明度指数Ｌ* が３０以下に調整されてい
る。このめっき鋼板は、Ｚｎ層又はＭｇ含有量０．５重
量％以下のＺｎ−Ｍｇ合金層又はＭｇ含有量７〜２０重
量％のＺｎ−Ｍｇ合金層を下層として介在させるとき、
耐食性が向上する。Black Zn-Mg of the present invention
In order to achieve the object, the system-plated steel sheet has a layer composed of Mg (OH) 2 , ZnO and Zn formed on the outermost surface of the plated layer, and the lightness index L * is adjusted to 30 or less. In this plated steel sheet, when a Zn layer or a Zn-Mg alloy layer having a Mg content of 0.5 wt% or less or a Zn-Mg alloy layer having a Mg content of 7 to 20 wt% is interposed as a lower layer,
Corrosion resistance is improved.
【０００５】また、Ｚｎ層又はＭｇ含有量０．５重量％
以下のＺｎ−Ｍｇ合金層，Ｍｇ含有量７〜２０重量％の
Ｚｎ−Ｍｇ合金層を鋼板表面に順次形成し、その上にＭ
ｇ（ＯＨ）2 ，ＺｎＯ及びＺｎからなる層を設けること
によって、めっき密着性及び耐食性が向上する。或い
は、Ｚｎ層又はＭｇ含有量０．５重量％以下のＺｎ−Ｍ
ｇ合金層，Ｍｇ含有量２〜７重量％のＺｎ−Ｍｇ合金
層，Ｍｇ含有量７〜２０重量％のＺｎ−Ｍｇ合金層を鋼
板表面に順次形成し、その上にＭｇ（ＯＨ）2 ，ＺｎＯ
及びＺｎからなる層を設けることによっても、めっき密
着性及び耐食性が向上する。Ｍｇ（ＯＨ）2 ，ＺｎＯ及
びＺｎからなる層は、めっき層最表層にＭｇ含有量７〜
２０重量％のＺｎ−Ｍｇ合金層を形成し、温度７０〜９
５℃，相対湿度５０〜９０％の高温高湿雰囲気で処理す
ることにより形成される。The Zn layer or the Mg content is 0.5% by weight.
The following Zn-Mg alloy layer and a Zn-Mg alloy layer having a Mg content of 7 to 20 wt% were sequentially formed on the surface of the steel sheet, and M was formed thereon.
By providing a layer composed of g (OH) 2 , ZnO and Zn, plating adhesion and corrosion resistance are improved. Alternatively, a Zn layer or Zn-M having a Mg content of 0.5 wt% or less
A g-alloy layer, a Zn-Mg alloy layer having a Mg content of 2 to 7% by weight, and a Zn-Mg alloy layer having a Mg content of 7 to 20% by weight are sequentially formed on the steel sheet surface, and Mg (OH) 2 , ZnO
The plating adhesion and corrosion resistance are also improved by providing a layer made of Zn and Zn. The layer composed of Mg (OH) 2 , ZnO and Zn has a Mg content of 7-
A Zn-Mg alloy layer of 20 wt% is formed, and the temperature is 70-9.
It is formed by processing in a high temperature and high humidity atmosphere at 5 ° C. and a relative humidity of 50 to 90%.
【０００６】[0006]
【作用】本発明では、無機質のＺｎ，ＺｎＯ及びＭｇ
（ＯＨ）2 によってめっき鋼板を黒色化している。その
ため、太陽光線が長期間にわたって照射される使用環境
においても変色せず、優れた耐候性を呈する。Ｚｎ，Ｚ
ｎＯ及びＭｇ（ＯＨ）2 からなる最表層は、明度指数Ｌ
* が３０以下で重量感のある黒色を呈する。なお、明度
指数Ｌ* が３０以下で安定した黒色を得るためには、Ｚ
ｎ，ＺｎＯ及びＭｇ（ＯＨ）2 からなる最表層が０．１
μｍ以上の厚みをもつことが好ましい。Ｚｎ，ＺｎＯ及
びＭｇ（ＯＨ）2 からなる最表層は、鋼板表面を均一に
覆った強固な酸化物系皮膜であるため、それ自体で耐食
性に優れている。更に優れた耐食性が要求される場合、
Ｚｎ層又はＭｇ含有量０．５重量％以下のＺｎ−Ｍｇ合
金層やＭｇ含有量７〜２０重量％のＺｎ−Ｍｇ合金層を
めっき層下層として形成する。In the present invention, the inorganic Zn, ZnO and Mg
The plated steel sheet is blackened by (OH) 2 . Therefore, it does not discolor even in a use environment in which sunlight is irradiated for a long period of time, and exhibits excellent weather resistance. Zn, Z
The outermost layer composed of nO and Mg (OH) 2 has a lightness index L
When * is 30 or less, it has a heavy black color. In order to obtain a stable black color with a lightness index L * of 30 or less, Z
The outermost layer composed of n, ZnO and Mg (OH) 2 is 0.1
It is preferable to have a thickness of μm or more. The outermost surface layer made of Zn, ZnO and Mg (OH) 2 is a strong oxide film uniformly covering the surface of the steel sheet, and therefore has excellent corrosion resistance by itself. If even better corrosion resistance is required,
A Zn layer, a Zn-Mg alloy layer having a Mg content of 0.5 wt% or less, or a Zn-Mg alloy layer having a Mg content of 7 to 20 wt% is formed as a plating layer lower layer.
【０００７】Ｚｎ，ＺｎＯ及びＭｇ（ＯＨ）2 からなる
最表層は、酸化物系の皮膜であることから、厚くなると
鋼板表面から剥離する場合がある。また、Ｍｇ含有量が
７〜２０重量％のＺｎ−Ｍｇ合金層は、脆い金属間化合
物相を呈し、剥離することがある。そこで、めっき層の
剥離を抑制するため、Ｚｎ又はＭｇ含有量０．５重量％
以下のＺｎ−Ｍｇ合金層を形成し、めっき密着性を改善
することが好ましい。めっき密着性は、Ｚｎ又はＭｇ含
有量０．５重量％以下のＺｎ−Ｍｇ合金層，Ｍｇ含有量
７〜２０重量％のＺｎ−Ｍｇ合金層を下層として順次形
成することによっても改善される。Since the outermost layer composed of Zn, ZnO and Mg (OH) 2 is an oxide film, it may peel off from the surface of the steel sheet if it becomes thick. Further, the Zn-Mg alloy layer having a Mg content of 7 to 20% by weight exhibits a brittle intermetallic compound phase and may peel off. Therefore, in order to suppress the peeling of the plating layer, the Zn or Mg content is 0.5% by weight.
It is preferable to form the following Zn-Mg alloy layer to improve plating adhesion. The plating adhesion can also be improved by sequentially forming a Zn-Mg alloy layer having a Zn or Mg content of 0.5 wt% or less and a Zn-Mg alloy layer having a Mg content of 7 to 20 wt% as the lower layers.
【０００８】このようにして、本発明に従った黒色Ｚｎ
−Ｍｇ系めっき鋼板は、要求特性に応じて図１〜５に示
す種々の層構造をとる。すなわち、鋼板表面にＺｎ，Ｚ
ｎＯ及びＭｇ（ＯＨ）2 からなる単一のめっき層（図
１），Ｚｎ又はＭｇ含有量０．５重量％以下のＺｎ−Ｍ
ｇ合金層を下層としてＺｎ，ＺｎＯ及びＭｇ（ＯＨ）2
からなる層を形成した２層構造のめっき層（図２），Ｍ
ｇ含有量７〜２０重量％のＺｎ−Ｍｇ合金層を下層とし
てＺｎ，ＺｎＯ及びＭｇ（ＯＨ）2 からなる層を形成し
た２層構造のめっき層（図３），Ｚｎ又はＭｇ含有量
０．５重量％以下のＺｎ−Ｍｇ合金層，Ｍｇ含有量７〜
２０重量％のＺｎ−Ｍｇ合金層，Ｚｎ，ＺｎＯ及びＭｇ
（ＯＨ）2 からなる層を順次形成した３層構造のめっき
層（図４），Ｚｎ又はＭｇ含有量０．５重量％以下のＺ
ｎ−Ｍｇ合金層，Ｍｇ含有量２〜７重量％のＺｎ−Ｍｇ
合金層，Ｍｇ含有量７〜２０重量％のＺｎ−Ｍｇ合金
層，Ｚｎ，ＺｎＯ及びＭｇ（ＯＨ）2 からなる層を順次
形成した４層構造のめっき層（図４）等である。何れの
層構造でも、Ｚｎ，ＺｎＯ及びＭｇ（ＯＨ）2 からなる
層が最表層にあり、明度指数Ｌ* が３０以下の黒色表面
をもっている。Thus, the black Zn according to the invention is
The Mg-plated steel sheet has various layered structures shown in FIGS. That is, Zn, Z
Single plating layer consisting of nO and Mg (OH) 2 (Fig. 1), Zn-M with Zn or Mg content of 0.5 wt% or less
Zn, ZnO and Mg (OH) 2 with the g alloy layer as the lower layer
Plating layer having a two-layer structure in which a layer made of M is formed (Fig. 2), M
A Zn-Mg alloy layer having a g content of 7 to 20% by weight as a lower layer and a plating layer having a two-layer structure in which a layer made of Zn, ZnO and Mg (OH) 2 is formed (Fig. 3), a Zn or Mg content of 0. Zn-Mg alloy layer of 5 wt% or less, Mg content 7 to
20 wt% Zn-Mg alloy layer, Zn, ZnO and Mg
A plating layer having a three-layer structure in which layers composed of (OH) 2 are sequentially formed (FIG. 4), Z having a Zn or Mg content of 0.5 wt% or less.
n-Mg alloy layer, Zn-Mg having Mg content of 2 to 7% by weight
An alloy layer, a Zn—Mg alloy layer having a Mg content of 7 to 20% by weight, and a plating layer having a four-layer structure in which layers composed of Zn, ZnO and Mg (OH) 2 are sequentially formed (FIG. 4) and the like. In any of the layer structures, a layer composed of Zn, ZnO and Mg (OH) 2 is the outermost layer and has a black surface with a lightness index L * of 30 or less.
【０００９】Ｚｎ，ＺｎＯ及びＭｇ（ＯＨ）2 からなる
層は、めっき層最表層に形成したＭｇ含有量７〜２０重
量％のＺｎ−Ｍｇ合金層を温度７０〜９５℃，相対湿度
５０〜９０％の高温高湿雰囲気に曝すとき、良質の色調
をもった黒色皮膜となる。温度７０℃未満又は相対湿度
５０％以下の雰囲気では、得られた黒色にムラが生じ
る。逆に、９５℃を超える温度又は９０％を超える相対
湿度の雰囲気では、めっき表面に白錆が発生する。本発
明に従って得られた黒色Ｚｎ−Ｍｇ系めっき鋼板は、加
工する場合の疵付きを防止するためクリアー塗装等で黒
色めっき層を保護することが好ましい。クリアー塗装と
しては、エポキシ系，塩化ビニル系，アクリル系等の塗
料が使用される。The layer composed of Zn, ZnO and Mg (OH) 2 is a Zn-Mg alloy layer having a Mg content of 7 to 20 wt% formed on the outermost layer of the plating layer at a temperature of 70 to 95 ° C. and a relative humidity of 50 to 90. %, When exposed to a high temperature and high humidity atmosphere, a black film with a good color tone is formed. In an atmosphere where the temperature is lower than 70 ° C. or the relative humidity is 50% or less, the obtained black color is uneven. On the contrary, white rust is generated on the plating surface in an atmosphere having a temperature exceeding 95 ° C. or a relative humidity exceeding 90%. In the black Zn-Mg-based plated steel sheet obtained according to the present invention, it is preferable to protect the black plating layer by clear coating or the like in order to prevent flaws during processing. As the clear coating, epoxy-based, vinyl chloride-based, acrylic-based, etc. paints are used.
【００１０】[0010]
【実施例】鋼板上にＺｎ，Ｍｇの順に蒸着めっきし、加
熱合金化処理によってＺｎ−Ｍｇ合金めっき鋼板を製造
した。このとき、Ｚｎ付着量，Ｍｇ付着量，加熱温度を
調節することにより、Ｍｇ含有量７〜２０重量％のＺｎ
−Ｍｇ合金層の単層構造（図６），Ｚｎ層又はＭｇ含有
量０．５重量％以下のＺｎ−Ｍｇ合金層，Ｍｇ含有量７
〜２０重量％のＺｎ−Ｍｇ合金層の順に鋼板上に形成し
た２層構造（図７），Ｚｎ層又はＭｇ含有量０．５重量
％以下のＺｎ−Ｍｇ合金層，Ｍｇ含有量２〜７重量％の
Ｚｎ−Ｍｇ合金層，Ｍｇ含有量７〜２０重量％のＺｎ−
Ｍｇ合金層の順に鋼板上に形成した３層構造（図８）の
層構造をもつめっき層を形成した。各Ｚｎ−Ｍｇ合金め
っき鋼板を温度８０℃，相対湿度８０％の高温高湿環境
に１０〜６０分間放置し、最表層をＭｇ（ＯＨ）2 ，Ｚ
ｎ及びＺｎＯからなる層に改質した。このとき、図６及
び図７のＭｇ含有量７〜２０重量％のＺｎ−Ｍｇ合金層
の全てをＭｇ（ＯＨ）2 ，Ｚｎ及びＺｎＯからなる層に
改質したものが図１及び図２に相当し、図６〜８のＭｇ
含有量７〜２０重量％のＺｎ−Ｍｇ合金層の表層部をＭ
ｇ（ＯＨ）2 ，Ｚｎ及びＺｎＯからなる層に改質したも
のが図３〜５に相当する。Example A Zn-Mg alloy-plated steel sheet was manufactured by performing vapor deposition plating of Zn and Mg on a steel sheet in this order and performing heat alloying treatment. At this time, by adjusting the Zn adhesion amount, the Mg adhesion amount, and the heating temperature, Zn with a Mg content of 7 to 20 wt% is adjusted.
-Single layer structure of Mg alloy layer (Fig. 6), Zn layer or Zn-Mg alloy layer with Mg content of 0.5 wt% or less, Mg content 7
˜20 wt% Zn-Mg alloy layer formed on the steel sheet in this order (FIG. 7), Zn layer or Zn-Mg alloy layer with Mg content of 0.5 wt% or less, Mg content 2-7 Wt% Zn-Mg alloy layer, Mg content 7-20 wt% Zn-
A plating layer having a three-layer structure (FIG. 8) formed on the steel sheet in the order of the Mg alloy layer was formed. Each Zn-Mg alloy plated steel sheet is left in a high temperature and high humidity environment at a temperature of 80 ° C. and a relative humidity of 80% for 10 to 60 minutes, and the outermost layer is Mg (OH) 2 , Z.
It was modified into a layer composed of n and ZnO. At this time, all of the Zn—Mg alloy layers having a Mg content of 7 to 20 wt% in FIGS. 6 and 7 are modified into layers composed of Mg (OH) 2 , Zn and ZnO, and FIGS. Corresponding, Mg of Figures 6-8
The surface layer portion of the Zn-Mg alloy layer having a content of 7 to 20% by weight is M
A layer formed of g (OH) 2 , Zn and ZnO corresponds to FIGS.
【００１１】また、比較のため、Ｍｇ（ＯＨ）2 ，Ｚ
ｎ，ＺｎＯからなる層の厚みが０．１μｍに達しない黒
色Ｚｎ−Ｍｇ系めっき鋼板（比較例１），通常のＺｎめ
っき鋼板（比較例２），酸化による亜鉛めっき層の表層
をＺｎＯとしためっき鋼板（比較例３）及びリン酸塩処
理したＺｎめっき鋼板（比較例４）を用意した。各めっ
き鋼板の色調を色差計で測定した。また、最表層のＭｇ
（ＯＨ）2 を含有したＺｎ合金層について、めっき層の
厚さ，Ｍｇ（ＯＨ）2 濃度及びＺｎＯ濃度を測定した。
更に、塩水噴霧試験における赤錆発生時間で耐食性を評
価した。表１の調査結果にみられるように、本発明に従
った実施例１〜１５では、何れも明度指数Ｌ* が３０以
下の安定した黒色表面が得られていた。また、耐食性も
非常に優れていた。For comparison, Mg (OH) 2 , Z
ZnO was used as the surface layer of the black Zn-Mg-based plated steel sheet (Comparative Example 1) in which the thickness of the layer consisting of n and ZnO did not reach 0.1 μm (Comparative Example 1), the ordinary Zn plated steel sheet (Comparative Example 2), and the zinc plated layer by oxidation. A plated steel sheet (Comparative Example 3) and a phosphate-treated Zn-plated steel sheet (Comparative Example 4) were prepared. The color tone of each plated steel sheet was measured with a color difference meter. In addition, the outermost layer of Mg
With respect to the Zn alloy layer containing (OH) 2 , the thickness of the plating layer, the Mg (OH) 2 concentration and the ZnO concentration were measured.
Furthermore, the corrosion resistance was evaluated by the red rust generation time in the salt spray test. As can be seen from the survey results in Table 1, in Examples 1 to 15 according to the present invention, a stable black surface having a lightness index L * of 30 or less was obtained. Moreover, the corrosion resistance was also very excellent.
【００１２】これに対し、リン酸塩処理により黒色化し
た比較例４では、明度指数Ｌ* が４２と黒色化度が低
く、耐食性を示す赤錆発生時間も大幅に短かった。ま
た、最表層のＭｇ（ＯＨ）2 を含有したＺｎ合金層であ
っても、層厚が不足すると比較例１に示すように明度指
数Ｌ* が高い値を示した。以上の対比から明らかなよう
に、めっき層最表層にＭｇ（ＯＨ）2 ，Ｚｎ，ＺｎＯか
らなる層を形成するとき、従来のリン酸塩処理では得ら
れない高品質の黒色皮膜が形成されることが判る。ま
た、Ｍｇ（ＯＨ）2 ，Ｚｎ，ＺｎＯからなる層を厚く形
成するとき、明度指数Ｌ* が３０以下の黒色皮膜が安定
して得られることが判る。On the other hand, in Comparative Example 4 which was blackened by the phosphate treatment, the lightness index L * was 42, the degree of blackening was low, and the red rust generation time showing the corrosion resistance was significantly short. Further, even in the Zn alloy layer containing Mg (OH) 2 as the outermost layer, when the layer thickness was insufficient, the lightness index L * showed a high value as shown in Comparative Example 1. As is clear from the above comparison, when forming a layer composed of Mg (OH) 2 , Zn, and ZnO on the outermost layer of the plating layer, a high-quality black film which cannot be obtained by the conventional phosphate treatment is formed. I understand. It is also found that when a thick layer of Mg (OH) 2 , Zn, ZnO is formed, a black film having a lightness index L * of 30 or less can be stably obtained.
【００１３】 [0013]
【００１４】また、本発明に従って得られた黒色Ｚｎ−
Ｍｇ系めっき鋼板の耐パウダリング性を調査した。耐パ
ウダリング性は、６ｔ曲げ曲げ戻し後テープ剥離試験で
判定し、めっき層の剥離がないものを◎，一部剥離した
ものを○，全面で剥離が生じたが剥離量が少量であるも
のを△，全面で剥離が生じ且つ剥離量が多量出あるもの
を×として評価した。調査結果を表２に示す。なお、表
２では、合金化溶融Ｚｎめっき鋼板を比較例５として同
様に耐パウダリング性を調査した。表２にみられるよう
に、本発明に従った黒色Ｚｎ−Ｍｇ系めっき鋼板は、何
れも良好な耐パウダリング性を示し、加工性に優れてい
ることが判る。Also, the black Zn-obtained according to the present invention
The powdering resistance of the Mg-based plated steel sheet was investigated. The powdering resistance was judged by a tape peeling test after bending and bending back for 6 tons, ◎ when the plating layer was not peeled, ◯ when it was partially peeled, and when the entire surface was peeled but the peeling amount was small. Was evaluated as Δ, and the case where peeling occurred on the entire surface and a large amount of peeling occurred was evaluated as x. Table 2 shows the survey results. In Table 2, the alloying hot-dip Zn-plated steel sheet was used as Comparative Example 5 and the powdering resistance was similarly investigated. As can be seen from Table 2, all the black Zn-Mg-based plated steel sheets according to the present invention show good powdering resistance and are excellent in workability.
【００１５】 [0015]
【００１６】[0016]
【発明の効果】以上に説明したように、本発明の黒色Ｚ
ｎ−Ｍｇ系めっき鋼板は、Ｍｇ（ＯＨ）2 ，Ｚｎ，Ｚｎ
Ｏからなる層で最表層を構成することにより、明度指数
Ｌ* が３０以下と黒色化度に優れている。また、この黒
色は、無機質のＭｇ（ＯＨ）2，Ｚｎ，ＺｎＯに由来す
るものであるから、太陽光線の照射等によって変色する
ことがなく耐候性に優れている。しかも、Ｚｎ−Ｍｇ系
めっき本来の高耐食性が維持されている。そのため、家
電製品のハウジング，部材等に高品質の材料として使用
される。As described above, the black Z of the present invention is used.
The n-Mg-based plated steel sheet is composed of Mg (OH) 2 , Zn, Zn.
By forming the outermost layer with a layer of O, the lightness index L * is 30 or less, which is excellent in blackening degree. Further, since this black color is derived from inorganic Mg (OH) 2 , Zn, ZnO, it does not discolor due to irradiation of sunlight and has excellent weather resistance. Moreover, the original high corrosion resistance of Zn-Mg system plating is maintained. Therefore, it is used as a high-quality material for housings and members of home electric appliances.
【図１】 本発明に従った単層構造の黒色Ｚｎ−Ｍｇ系
めっき鋼板FIG. 1 is a black Zn-Mg-based plated steel sheet having a single-layer structure according to the present invention.
【図２】 本発明に従った２層構造の黒色Ｚｎ−Ｍｇ系
めっき鋼板FIG. 2 is a two-layer structure black Zn-Mg-based plated steel sheet according to the present invention.
【図３】 本発明に従った２層構造の黒色Ｚｎ−Ｍｇ系
めっき鋼板FIG. 3 is a black Zn-Mg-based plated steel sheet having a two-layer structure according to the present invention.
【図４】 本発明に従った３層構造の黒色Ｚｎ−Ｍｇ系
めっき鋼板FIG. 4 is a black Zn-Mg-based plated steel sheet having a three-layer structure according to the present invention.
【図５】 本発明に従った３層構造の黒色Ｚｎ−Ｍｇ系
めっき鋼板FIG. 5 is a black Zn-Mg-based plated steel sheet having a three-layer structure according to the present invention.
【図６】 黒色Ｚｎ−Ｍｇ系めっき鋼板の出発材料であ
るＺｎ−Ｍｇ合金層単層が形成されためっき鋼板層FIG. 6 is a plated steel sheet layer on which a Zn-Mg alloy layer single layer, which is a starting material for a black Zn-Mg-based plated steel sheet, is formed.
【図７】 黒色Ｚｎ−Ｍｇ系めっき鋼板の出発材料であ
る２層構造のＺｎ−Ｍｇ合金層単層が形成されためっき
鋼板層FIG. 7 is a plated steel sheet layer in which a single layer of a Zn-Mg alloy layer having a two-layer structure, which is a starting material for a black Zn-Mg-based plated steel sheet, is formed.
【図８】 黒色Ｚｎ−Ｍｇ系めっき鋼板の出発材料であ
る３層構造のＺｎ−Ｍｇ合金層単層が形成されためっき
鋼板層FIG. 8 is a plated steel sheet layer in which a single layer of a Zn-Mg alloy layer having a three-layer structure, which is a starting material for a black Zn-Mg-based plated steel sheet, is formed.
Claims (6)
るめっき層が形成され、明度指数Ｌ* が３０以下の黒色
Ｚｎ−Ｍｇ系めっき鋼板。1. A black Zn-Mg-based plated steel sheet having a plating layer made of Mg (OH) 2 , ZnO and Zn and having a lightness index L * of 30 or less.
のＺｎ−Ｍｇ合金層を介してＭｇ（ＯＨ）2 ，ＺｎＯ及
びＺｎからなる層が形成され、明度指数Ｌ*が３０以下
の黒色Ｚｎ−Ｍｇ系めっき鋼板。2. A layer composed of Mg (OH) 2 , ZnO and Zn is formed through a Zn layer or a Zn—Mg alloy layer having a Mg content of 0.5 wt% or less, and a lightness index L * of 30 or less. Black Zn-Mg based plated steel sheet.
合金層を介してＭｇ（ＯＨ）2 ，ＺｎＯ及びＺｎからな
る層が形成され、明度指数Ｌ* が３０以下の黒色Ｚｎ−
Ｍｇ系めっき鋼板。3. Zn-Mg having a Mg content of 7 to 20% by weight.
A layer made of Mg (OH) 2 , ZnO and Zn is formed through the alloy layer, and a black Zn- having a lightness index L * of 30 or less is formed.
Mg-based plated steel sheet.
５重量％以下のＺｎ−Ｍｇ合金層，第２層としてＭｇ含
有量７〜２０重量％のＺｎ−Ｍｇ合金層，第３層として
Ｍｇ（ＯＨ）2 ，ＺｎＯ及びＺｎからなる層が鋼板表面
に順次形成され、明度指数Ｌ* が３０以下の黒色Ｚｎ−
Ｍｇ系めっき鋼板。4. A Zn layer as the first layer or a Mg content of 0.
A Zn-Mg alloy layer of 5 wt% or less, a Zn-Mg alloy layer having a Mg content of 7 to 20 wt% as the second layer, and a layer composed of Mg (OH) 2 , ZnO and Zn as the third layer are formed on the surface of the steel sheet. Black Zn- successively formed with a lightness index L * of 30 or less
Mg-based plated steel sheet.
５重量％以下のＺｎ−Ｍｇ合金層，第２層としてＭｇ含
有量２〜７重量％のＺｎ−Ｍｇ合金層，第３層としてＭ
ｇ含有量７〜２０重量％のＺｎ−Ｍｇ合金層，第４層と
してＭｇ（ＯＨ）2 ，ＺｎＯ及びＺｎからなる層が鋼板
表面に順次形成され、明度指数Ｌ* が３０以下の黒色Ｚ
ｎ−Ｍｇ系めっき鋼板。5. A Zn layer as the first layer or a Mg content of 0.
Zn-Mg alloy layer with 5 wt% or less, Zn-Mg alloy layer with Mg content of 2 to 7 wt% as the second layer, M as the third layer
A Zn-Mg alloy layer having a g content of 7 to 20% by weight, a layer composed of Mg (OH) 2 , ZnO and Zn as a fourth layer is sequentially formed on the steel sheet surface, and a lightness index L * is 30 or less in black Z.
n-Mg based plated steel sheet.
％のＺｎ−Ｍｇ合金層を形成し、温度７０〜９５℃，相
対湿度５０〜９０％の高温高湿雰囲気で処理することに
よりめっき層表層をＭｇ（ＯＨ）2 ，ＺｎＯ及びＺｎか
らなる層に改質する黒色Ｚｎ−Ｍｇ系めっき鋼板の製造
方法6. A plating is performed by forming a Zn—Mg alloy layer having a Mg content of 7 to 20% by weight on the surface of the plating layer and treating in a high temperature and high humidity atmosphere at a temperature of 70 to 95 ° C. and a relative humidity of 50 to 90%. Method for manufacturing black Zn-Mg-based plated steel sheet in which layer surface layer is modified to a layer composed of Mg (OH) 2 , ZnO and Zn
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32517395A JPH09143679A (en) | 1995-11-20 | 1995-11-20 | Black zinc-magnesium plated steel sheet and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32517395A JPH09143679A (en) | 1995-11-20 | 1995-11-20 | Black zinc-magnesium plated steel sheet and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09143679A true JPH09143679A (en) | 1997-06-03 |
Family
ID=18173830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32517395A Withdrawn JPH09143679A (en) | 1995-11-20 | 1995-11-20 | Black zinc-magnesium plated steel sheet and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09143679A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9296903B2 (en) | 2011-03-28 | 2016-03-29 | Posco | Film formation composition for preventing blackening of steel sheet, and steel sheet having film formed by composition |
| JP2017190489A (en) * | 2016-04-13 | 2017-10-19 | 新日鐵住金株式会社 | Plated steel material |
| WO2020130396A1 (en) * | 2018-12-19 | 2020-06-25 | 주식회사 포스코 | Plated steel plate having excellent glossiness and surface property, and method for manufacturing same |
-
1995
- 1995-11-20 JP JP32517395A patent/JPH09143679A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9296903B2 (en) | 2011-03-28 | 2016-03-29 | Posco | Film formation composition for preventing blackening of steel sheet, and steel sheet having film formed by composition |
| JP2017190489A (en) * | 2016-04-13 | 2017-10-19 | 新日鐵住金株式会社 | Plated steel material |
| WO2020130396A1 (en) * | 2018-12-19 | 2020-06-25 | 주식회사 포스코 | Plated steel plate having excellent glossiness and surface property, and method for manufacturing same |
| KR20200076824A (en) * | 2018-12-19 | 2020-06-30 | 주식회사 포스코 | Plated steel sheet having excellent surface property and glossiness, and method for manufacturing the same |
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Legal Events
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