JP2974878B2 - Black plated steel sheet with excellent adhesion and corrosion resistance and method for producing the same - Google Patents
Black plated steel sheet with excellent adhesion and corrosion resistance and method for producing the sameInfo
- Publication number
- JP2974878B2 JP2974878B2 JP5104602A JP10460293A JP2974878B2 JP 2974878 B2 JP2974878 B2 JP 2974878B2 JP 5104602 A JP5104602 A JP 5104602A JP 10460293 A JP10460293 A JP 10460293A JP 2974878 B2 JP2974878 B2 JP 2974878B2
- Authority
- JP
- Japan
- Prior art keywords
- black
- steel sheet
- plated steel
- corrosion resistance
- excellent adhesion
- 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.)
- Expired - Lifetime
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- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は黒色めっき鋼板に関する
もので、特に密着性、耐食性に優れた黒色めっき鋼板と
その製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a black-plated steel sheet, and more particularly to a black-plated steel sheet having excellent adhesion and corrosion resistance and a method for producing the same.
【0002】[0002]
【従来の技術】黒色めっき鋼板の従来技術はZn−Ni
合金めっき鋼板を硝酸水溶液でエッチング(特開昭60
−121275号公報)もしくは硝酸塩水溶液中で陽極
酸化する(特開昭61−143594号公報)もしくは
硝酸イオン含有の亜鉛ニッケル合金めっき中で陰極電解
する(特公平3−40116号公報)ことによって黒色
皮膜を形成させたのち、クロメート処理を行ない、さら
にその上層に樹脂を被覆する方法が公開されている。こ
れらの技術はそれぞれ特徴があり、陰極電解処理が最も
効率的で高速生産のできる処理である。2. Description of the Related Art The prior art of black-plated steel sheet is Zn-Ni.
Etching alloy plated steel plate with nitric acid aqueous solution
JP-A-112275) or anodizing in an aqueous nitrate solution (JP-A-61-143594) or performing cathodic electrolysis in zinc-nickel alloy plating containing nitrate ions (JP-B-3-40116). A method is disclosed in which a chromate treatment is performed after the formation of a resin, and a resin is further coated on the upper layer. Each of these techniques has its own characteristics, and cathodic electrolysis is the most efficient and high-speed production process.
【0003】[0003]
【発明が解決しようとする課題】従来の黒色めっき鋼板
は上述した多段処理による多層構造のため操業条件によ
って品質が影響されやすく、密着性、耐食性に優れた黒
色めっき鋼板を得るため細かな作業管理が必要な課題が
ある。密着性不良は、多くの場合、黒色皮膜とクロメー
ト間の剥離、クロメート内の剥離および樹脂とクロメー
ト間で剥離することが観察される。本発明は安定した密
着性、耐食性および美麗な外観が得られる黒色めっき鋼
板とその製造方法を提供することを目的とするものであ
る。The conventional black-plated steel sheet has a multi-layer structure formed by the above-described multi-step processing, so that its quality is easily affected by operating conditions, and fine work management is required to obtain a black-plated steel sheet having excellent adhesion and corrosion resistance. There are issues that need to be addressed. In many cases, poor adhesion is observed as peeling between the black film and the chromate, peeling in the chromate, and peeling between the resin and the chromate. An object of the present invention is to provide a black-plated steel sheet capable of obtaining stable adhesion, corrosion resistance and beautiful appearance, and a method for producing the same.
【0004】[0004]
【課題を解決するための手段】本発明は従来の技術の課
題を有利に解決するものであって、 (1)亜鉛合金めっき鋼板の表面にクロム化合物をCr
として10〜50mg/m2 共析させた黒色皮膜層、そ
の上層にCrとして5〜90mg/m2 のクロメート被
膜、その上層に樹脂皮膜層を被覆したことを特徴とする
密着性、耐食性に優れた黒色めっき鋼板。SUMMARY OF THE INVENTION The present invention advantageously solves the problems of the prior art. (1) A chromium compound is added to the surface of a zinc alloy plated steel sheet
Excellent adhesion and corrosion resistance, characterized in that a black coating layer of 10 to 50 mg / m 2 as eutectoid, a chromate coating of 5 to 90 mg / m 2 as Cr on the upper coating layer, and a resin coating layer on the upper coating layer Black plated steel sheet.
【0005】(2)亜鉛合金めっき鋼板の表面にNO3
- ,Zn2+,Ni2+,Cr3+を含む水溶液中で陰極電解
によってクロム化合物をCrとして10〜50mg/m
2 共析させた黒色皮膜層、その上層にCrとして5〜9
0mg/m2 のクロメート、その上層に樹脂皮膜層を被
覆したことを特徴とする密着性、耐食性に優れた黒色め
っき鋼板。(2) NO 3 is applied to the surface of a zinc alloy plated steel sheet.
-, 10~50mg / m Zn 2+, Ni 2+, the chromium compound by cathodic electrolysis in an aqueous solution containing Cr 3+ as Cr
2 Co-deposited black coating layer, 5 to 9 as Cr on top
A black-plated steel sheet having excellent adhesion and corrosion resistance, characterized by having a chromate of 0 mg / m 2 and a resin film layer coated thereon.
【0006】(3)亜鉛合金めっき鋼板の表面にクロム
化合物をCrとして10〜50mg/m2 共析させた黒
色皮膜層、その上層にCrとして5〜90mg/m2 の
クロメート被膜、その上層に樹脂皮膜層を被覆したこと
を特徴とする密着性、耐食性に優れた黒色めっき鋼板の
製造において樹脂被膜を塗布する入側板温を50〜80
℃、焼付後の到達板温を150℃以上とすることを特徴
とする密着性、耐食性に優れた黒色めっき鋼板の製造方
法。(3) A black coating layer in which a chromium compound as Cr is co-deposited at 10 to 50 mg / m 2 on the surface of a zinc alloy-plated steel sheet, a chromate coating of 5 to 90 mg / m 2 as Cr on the upper layer, In the production of a black plated steel sheet having excellent adhesion and corrosion resistance characterized by coating with a resin film layer, the temperature of the inlet side plate where the resin film is applied is 50 to 80.
A method for producing a black-plated steel sheet having excellent adhesion and corrosion resistance, wherein the ultimate sheet temperature after baking is 150 ° C. or higher.
【0007】(4)亜鉛合金めっき鋼板の表面にNO3
- ,Zn2+,Ni2+,Cr3+を含む水溶液中で電流密度
30A/dm2 以上の陰極電解によってクロム化合物を
Crとして10〜50mg/m2 共析させた黒色皮膜
層、その上層にCrとして5〜90mg/m2 のクロメ
ート、その上層に樹脂皮膜層を被覆したことを特徴とす
る密着性、耐食性に優れた黒色めっき鋼板の製造におい
て樹脂被膜を塗布する入側板温を50〜80℃、焼付後
の到達板温を140℃以上とすることを特徴とする密着
性、耐食性に優れた黒色めっき鋼板の製造方法にある。(4) NO 3 is applied to the surface of a zinc alloy plated steel sheet.
-, Zn 2+, Ni 2+, black coating layer was 10 to 50 mg / m 2 eutectoid chromium compound as Cr by a current density of 30A / dm 2 or more cathodic electrolysis in an aqueous solution containing Cr 3+, the upper layer A chromate of 5 to 90 mg / m 2 as Cr, and a resin coating layer coated on top of the chromate. A method for producing a black-plated steel sheet having excellent adhesion and corrosion resistance, characterized in that the ultimate sheet temperature after baking is set to 140 ° C. or higher at 80 ° C.
【0008】[0008]
【作用と実施例】図1は本発明の黒色めっき鋼板の被膜
構造の例を示した。aは薄鋼板、bは亜鉛合金めっき被
膜、cはZn−Ni−Crで構成される黒色被膜層、d
はクロメート被膜層、eは樹脂被膜層で構成される。本
発明の特徴とするところは安定した密着性、耐食性およ
び良好な黒色外観を得るためクロム化合物を黒色被膜層
にCrとして10〜50mg/m2 を共析させその上層
にCr付着量として5〜90mg/m2 のクロメート被
膜を被覆させた被膜構成にしたことである。FIG. 1 shows an example of the coating structure of the black plated steel sheet of the present invention. a is a thin steel plate, b is a zinc alloy plating film, c is a black film layer composed of Zn-Ni-Cr, d
Is a chromate coating layer, and e is a resin coating layer. The feature of the present invention is that a chromium compound is co-deposited with 10 to 50 mg / m 2 as Cr on the black coating layer to obtain stable adhesion, corrosion resistance and good black appearance, and the upper layer has a Cr adhesion amount of 5 to 50 mg / m 2. In other words, the coating composition was such that a 90 mg / m 2 chromate coating was applied.
【0009】黒色被膜層(c)は黒色の水和酸化物を主
成分とする黒色化合物で構成されるが、上層のクロメー
トおよび樹脂被膜を被覆する際に乾燥が不足すると界面
間の反応過多によって密着性の良くない脆い被膜を形成
しやすい。共析させるクロム化合物のバインダー効果に
よって密着性に優れた被膜が得られ、且つ、クロム化合
物の不働態化によって良好な耐食性が得られる。共析さ
せるクロム付着量を限定した理由はクロム化合物のバイ
ンダーおよび不働態化作用を得るためCrとして10m
g/m2 以上が必要であり、Crが50mg/m2 超で
はCrの不働態化作用により外観にむらが発生し黒色外
観が劣化するため好ましくない。以上の理由で最適な共
析Cr付着量範囲は15〜30mg/m2 である。The black coating layer (c) is composed of a black compound mainly composed of a black hydrated oxide. However, if the drying is insufficient when the upper chromate and the resin coating are coated, excessive reaction between the interfaces may occur. A brittle film with poor adhesion is easily formed. A film having excellent adhesion can be obtained by the binder effect of the chromium compound to be eutectoid, and good corrosion resistance can be obtained by passivation of the chromium compound. The reason for limiting the amount of deposited chromium to be eutectoid is that the chromium compound has a binder of 10 m in order to obtain a passivation effect.
g / m 2 or more is required, and if Cr is more than 50 mg / m 2 , the passivation of Cr causes uneven appearance and deteriorates the black appearance, which is not preferable. For the above reasons, the optimum eutectoid Cr adhesion amount range is 15 to 30 mg / m 2 .
【0010】クロム化合物を共析させた黒色被膜の上層
のクロメート被膜を限定した理由はCr付着量として5
mg/m2 未満では樹脂と黒色被膜が反応過多となり良
好な外観、密着性が得られにくい。また、Cr付着量が
90mg/m2 超ではクロメート被膜自身の凝集破壊が
生じ密着性が得られない。クロメート被膜の好ましい付
着量範囲はCrとして20〜50mg/m2 である。ク
ロメート被膜は公知のものを用いることができるが本発
明では塗布クロメートが望ましくクロム酸望ましくは部
分還元した還元クロム酸もしくは還元クロム酸にりん
酸、シリカゾル等を加えたクロメート液を塗布し、板温
として60℃以上に乾燥することが望ましい。The reason for limiting the upper chromate film on the black film on which the chromium compound is codeposited is that the amount of Cr attached is 5%.
When the amount is less than mg / m 2 , the resin and the black coating are excessively reacted, and it is difficult to obtain good appearance and adhesion. On the other hand, if the Cr adhesion amount exceeds 90 mg / m 2 , cohesive failure of the chromate film itself occurs, and no adhesion can be obtained. A preferred range of the amount of the chromate coating is 20 to 50 mg / m 2 as Cr. A known chromate film can be used, but in the present invention, chromate is preferably applied. Chromic acid, preferably partially reduced reduced chromic acid or a chromate solution obtained by adding phosphoric acid, silica sol, or the like to reduced chromic acid, is applied. Is desirably dried to 60 ° C. or more.
【0011】また、黒色めっき鋼板の製造において最終
の樹脂被膜を塗布する入側板温を50〜80℃、焼付後
の到達板温を好ましくは150℃以上とすることによっ
て密着性、耐食性に優れた黒色めっき鋼板を製造するこ
とができる。入側板温の限定理由は50℃未満では黒色
およびクロメート被膜の乾燥不足による密着不良80℃
超では樹脂液の温度上昇による樹脂液の粘度上昇、革張
りおよびコーター表面で乾きが生じるなどの理由で好ま
しくない。また、焼付後の板温の限定理由は140℃未
満では焼付不足による密着不良が生じ易く安定した密着
性が得られないためである。これらの操業条件を導入し
た本発明のプロセスを図2に示した。黒色めっき鋼板の
密着性、耐食性および外観が安定して得られる。[0011] Further, in the production of black-plated steel sheet, by setting the temperature of the inlet side plate where the final resin coating is applied to 50 to 80 ° C and the ultimate plate temperature after baking to preferably 150 ° C or higher, excellent adhesion and corrosion resistance are obtained. A black plated steel sheet can be manufactured. The reason for limiting the inlet side plate temperature is that if it is lower than 50 ° C, the adhesion is poor at 80 ° C due to insufficient drying of the black and chromate films.
If the temperature is too high, the viscosity of the resin liquid is increased due to the increase in the temperature of the resin liquid, and the leather coating and the coater surface are undesirably dried. The reason for limiting the sheet temperature after baking is that if the temperature is lower than 140 ° C., poor adhesion is likely to occur due to insufficient baking and stable adhesion cannot be obtained. The process of the present invention incorporating these operating conditions is shown in FIG. The adhesion, corrosion resistance and appearance of the black plated steel sheet can be obtained stably.
【0012】[0012]
【実施例】以下実施例にて説明する。図3、図4、図
5、図6は電気メッキパイロットラインを用いて亜鉛ニ
ッケル合金めっき鋼板(めっき量20g/m2 )を亜鉛
イオン55±10g/l、ニッケルイオンを55±10
g/l、三価クロムイオンを1±0.5g/l、有機添
加剤を20±5g/l加えた浴温55±5℃、pH2.
5±0.5の水溶液中で陰極として電流密度30±10
A/dm2 で20〜30クーロン/dm2 通電し、水洗
後ただちに還元クロム酸/りん酸比10/1でクロム酸
濃度を5〜20g/lのクロメート液を塗布し熱風で板
温80℃に乾燥後、入側板温を65〜75℃に調節して
シリカゾルを複合させたアクリル系エマルジョン樹脂塗
料を乾燥塗膜厚で1μm塗布し、焼付炉で出側到達板温
160℃に焼付たのち水冷して製造した黒色めっき鋼板
の密着性、耐食性および外観の結果を示したものであ
る。Embodiments will be described below with reference to embodiments. FIGS. 3, 4, 5, and 6 show that a zinc-nickel alloy-coated steel sheet (coating amount 20 g / m 2 ) was zinc ions 55 ± 10 g / l and nickel ions 55 ± 10 g using the electroplating pilot line.
g / l, trivalent chromium ion at 1 ± 0.5 g / l, organic additive at 20 ± 5 g / l, bath temperature 55 ± 5 ° C., pH 2.
Current density 30 ± 10 as a cathode in 5 ± 0.5 aqueous solution
And 20 to 30 coulombs / dm 2 current in A / dm 2, immediately chromic acid concentration reducing chromic acid / phosphoric acid ratio of 10/1 was washed with water 5 to 20 g / l chromate solution plate temperature 80 ° C. In applying hot air to the After drying, the inlet side plate temperature was adjusted to 65 to 75 ° C., and an acrylic emulsion resin coating compounded with silica sol was applied at a dry film thickness of 1 μm, and baked in a baking furnace to the outlet side plate temperature of 160 ° C. It shows the results of adhesion, corrosion resistance, and appearance of a black-plated steel sheet manufactured by water cooling.
【0013】図3はクロメートの付着量と密着性の関係
を実線aで示し、黒色被膜中のCr共析量と密着性の関
係を点線bで示した。密着性はエリクセン8mm加工後
テープ剥離して評価し、剥離したものを×で表示し、良
好なものを○で示した。結果から、明らかなようにクロ
メート付着量が90mg/m2 超(共析Cr25±2m
g/m2 一定)のものは密着性が良くない。また、共析
Cr量が10mg/m 2 未満(クロメート付着量が30
±2mg/m2 )のものは密着性が良くない結果を示し
た。FIG. 3 shows the relationship between the amount of chromate deposited and the adhesion.
Is indicated by a solid line a, and the relationship between the amount of Cr eutectoid in the black coating and the adhesion is shown.
The engagement is indicated by a dotted line b. Adhesion after Erichsen 8mm processing
The tape was peeled off and evaluated.
Good ones are indicated by a circle. The results clearly show that
90mg / mTwo Super (eutectoid Cr 25 ± 2m
g / mTwo (Constant) has poor adhesion. Also, eutectoid
Cr content is 10mg / m Two (Less than 30 chromate deposits)
± 2mg / mTwo ) Indicates poor adhesion.
Was.
【0014】図4は黒色被膜中の共析Cr量とクロメー
ト(Cr付着量30±2mg/m2)および樹脂被覆後
の黒色めっき鋼板の表面を色差計で測定した明度(実線
a:黒さを示し通常明度<20が必要)および密着性
(点線b)の関係を示した。共析Cr量が50mg/m
2 超では明度が20を超えて外観が劣化する。また、共
析Cr量が10mg/m2 未満では密着性が良くない。FIG. 4 shows the amounts of eutectoid Cr and chromate (Cr adhesion amount 30 ± 2 mg / m 2 ) in the black coating and the lightness (solid line a: blackness) of the surface of the black-plated steel sheet coated with the resin using a color difference meter. And a relationship between normal lightness <20 is required and adhesiveness (dotted line b). Eutectoid Cr content is 50mg / m
If it exceeds 2 , the lightness exceeds 20 and the appearance deteriorates. If the amount of eutectoid Cr is less than 10 mg / m 2 , the adhesion is not good.
【0015】図5は黒色被膜中の共析Cr量とクロメー
ト(Cr付着量30±2mg/m2)および樹脂被覆後
の黒色めっき鋼板の耐食性をJISZ−2371規定の
連続塩水噴霧試験機で7日試験した後の白錆の発生面積
率を目視で評価したものである。共析Cr量に比例して
白錆が減少し、共析Cr量が10mg/m2 超で白錆が
まったく認められず耐食性が改善されている。FIG. 5 shows the amount of eutectoid Cr in the black coating, the chromate (Cr adhesion amount 30 ± 2 mg / m 2 ), and the corrosion resistance of the black plated steel sheet coated with the resin using a continuous salt spray tester according to JISZ-2371. This is a visual evaluation of the area ratio of white rust after a day test. White rust was reduced in proportion to the amount of eutectoid Cr, and when the amount of eutectoid Cr exceeded 10 mg / m 2 , no white rust was observed and the corrosion resistance was improved.
【0016】図6は共析Cr量30mg/m2 およびク
ロメート付着量30mg/m2 の条件で樹脂被覆の入側
板温(a枠)と出側板温(b枠)の密着性におよぼす影
響を示した図である。密着性はOT曲げ後テープ剥離し
剥離を認められるものを×、良好なものを○で示した。
入側板温が40℃では剥離が生じ、50℃以上では良好
な密着性が得られた。また、出側板温が80℃では剥離
し、100℃でも30%の確立で剥離(評価△)するも
のが認められた。出側板温150℃以上ではまったく剥
離を認めなかった。FIG. 6 shows the effect of the resin coating on the adhesiveness between the inlet plate temperature (a frame) and the outlet plate temperature (b frame) under the conditions of eutectoid Cr content of 30 mg / m 2 and chromate adhesion amount of 30 mg / m 2. FIG. The adhesion was evaluated as x when the tape was peeled after OT bending and peeling was observed, and as good when the tape was peeled.
When the inlet side plate temperature was 40 ° C., peeling occurred, and at 50 ° C. or higher, good adhesion was obtained. In addition, peeling was observed when the exit sheet temperature was 80 ° C, and peeling (estimation △) was established at 30% even at 100 ° C. No peeling was observed at an exit side plate temperature of 150 ° C. or higher.
【0017】図7は黒色被膜の電流密度とクロメートお
よび樹脂被覆後のエリクセン密着性(実線a)および板
幅方向の明度変動(点線b:ΔL)の関係を示した図で
ある。共析Cr量は電流密度によって5〜30mg/m
2 に変動しおよびクロメート付着量30mg/m2 の条
件である。電流密度を30A/dm2 以上にすることに
より、優れた密着性が得られ、また、明度変動も0.5
以下でむらは感知されない程度に良好である。しかし、
電流密度10A/dm2 では密着性が不良となり明度変
動も3のむら外観となる。電流密度20A/dm2 では
密着性は良好で明度変動も1と改善されるがむらが認め
られる。FIG. 7 is a graph showing the relationship between the current density of the black film, the Erichsen adhesion after the chromate and resin coating (solid line a), and the brightness variation in the plate width direction (dotted line b: ΔL). The amount of eutectoid Cr is 5 to 30 mg / m depending on the current density.
2 and a condition of 30 mg / m 2 of chromate adhesion amount. By setting the current density to 30 A / dm 2 or more, excellent adhesion can be obtained, and brightness fluctuation can be reduced to 0.5.
Below, it is good enough that no unevenness is perceived. But,
At a current density of 10 A / dm 2 , the adhesion is poor, and the brightness variation has an uneven appearance of 3. At a current density of 20 A / dm 2 , the adhesion was good and the brightness variation was improved to 1, but unevenness was observed.
【0018】[0018]
【発明の効果】本発明の鋼板は従来のプレコート塗装鋼
板とは異なる特性例えば溶接性可能、傷がつき難い、指
紋が目立たないが得られ家電製品、自動車部品の内板、
準外板に使用することができる。本発明によって安定し
た外観、密着性および耐食性に優れた黒色めっき鋼板が
広い操業条件で確保され、高速で歩留の良い製造ができ
る効果がある。The steel sheet of the present invention has properties different from those of the conventional pre-coated steel sheet, such as weldability, scratch resistance, and inconspicuous fingerprints.
Can be used for quasi-skin. According to the present invention, a black-plated steel sheet having a stable appearance, adhesion and corrosion resistance is ensured under a wide range of operating conditions, and there is an effect that high-speed and high-yield production can be performed.
【図1】本発明の被膜の断面の構成を示した模式図、FIG. 1 is a schematic diagram showing a cross-sectional configuration of a coating film of the present invention;
【図2】本発明の黒色処理以降の製造工程と板温の範囲
を示した図、FIG. 2 is a view showing a manufacturing process and a range of a sheet temperature after black processing according to the present invention;
【図3】クロメート付着量および黒色被膜中の共析Cr
量と密着性の関係を示した図、FIG. 3 Chromate deposition amount and eutectoid Cr in black coating
A diagram showing the relationship between the amount and the adhesion,
【図4】黒色被膜中の共析Cr量と明度および密着性の
関係を示した図、FIG. 4 is a diagram showing the relationship between the amount of eutectoid Cr in a black coating and the brightness and adhesion.
【図5】黒色被膜中の共析Cr量と塩水噴霧耐食性の関
係を示した図、FIG. 5 is a diagram showing the relationship between the amount of eutectoid Cr in the black coating and the salt spray corrosion resistance;
【図6】黒色めっき鋼板の密着性におよぼす樹脂被覆の
入側板温および出側板温の関係を示した図、FIG. 6 is a diagram showing the relationship between the inlet sheet temperature and the outlet sheet temperature of the resin coating on the adhesion of the black plated steel sheet,
【図7】黒色被膜の電流密度と密着性(実線a)および
板幅方向の明度変動(点線b)の関係を示した図であ
る。FIG. 7 is a diagram showing the relationship between the current density of the black coating, the adhesion (solid line a), and the brightness variation in the plate width direction (dotted line b).
a 薄鋼板 b 亜鉛合金めっき被膜 c 黒色被膜層 d クロメート被膜層 e 樹脂被膜層 a Thin steel plate b Zinc alloy plating film c Black coating layer d Chromate coating layer e Resin coating layer
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平5−69508(JP,A) 特開 平5−59570(JP,A) (58)調査した分野(Int.Cl.6,DB名) C23C 28/00 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-69508 (JP, A) JP-A-5-59570 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C23C 28/00
Claims (4)
物をCrとして10〜50mg/m2 共析させた黒色被
膜層、その上層にCrとして5〜90mg/m2 のクロ
メート被膜、その上層に樹脂皮膜層を被覆したことを特
徴とする密着性、耐食性に優れた黒色めっき鋼板。1. A black coating layer in which a chromium compound is eutectoidized with 10 to 50 mg / m 2 as Cr on a surface of a zinc alloy plated steel sheet, a chromate coating with 5 to 90 mg / m 2 as Cr on an upper layer, and a resin on the upper layer A black plated steel sheet with excellent adhesion and corrosion resistance characterized by a coating layer.
Zn2+,Ni2+,Cr3+を含む水溶液中で陰極電解によ
ってクロム化合物をCrとして10〜50mg/m2 共
析させた黒色皮膜層、その上層にCrとして5〜90m
g/m2 のクロメート、その上層に樹脂皮膜層を被覆し
たことを特徴とする密着性、耐食性に優れた黒色めっき
鋼板。2. The method according to claim 1, wherein the surface of the zinc alloy-plated steel sheet has NO 3 − ,
A black coating layer obtained by co-depositing a chromium compound as Cr by 10 to 50 mg / m 2 by cathodic electrolysis in an aqueous solution containing Zn 2+ , Ni 2+ , and Cr 3+.
g / m 2 chromate, a black-plated steel sheet having excellent adhesion and corrosion resistance, characterized in that a resin film layer is coated thereon.
物をCrとして10〜50mg/m2 共析させた黒色皮
膜層、その上層にCrとして5〜90mg/m2 のクロ
メート被膜、その上層に樹脂皮膜層を被覆したことを特
徴とする密着性、耐食性に優れた黒色めっき鋼板の製造
において樹脂被膜を塗布する入側板温を50〜80℃、
焼付後の到達板温を140℃以上とすることを特徴とす
る密着性、耐食性に優れた黒色めっき鋼板の製造方法。3. A black coating layer obtained by codepositing a chromium compound as Cr with 10 to 50 mg / m 2 on the surface of a zinc alloy plated steel sheet, a chromate coating of 5 to 90 mg / m 2 as Cr on the upper layer, and a resin on the upper layer. In the production of a black-plated steel sheet having excellent adhesion and corrosion resistance, characterized in that the coating layer is coated, the inlet side sheet temperature at which the resin coating is applied is 50 to 80 ° C,
A method for producing a black-plated steel sheet having excellent adhesion and corrosion resistance, wherein the ultimate sheet temperature after baking is set to 140 ° C. or higher.
Zn2+,Ni2+,Cr3+を含む水溶液中で電流密度30
A/dm2 以上の陰極電解によってクロム化合物をCr
として10〜50mg/m2 共析させた黒色皮膜層、そ
の上層にCrとして5〜90mg/m2 のクロメート、
その上層に樹脂皮膜層を被覆したことを特徴とする密着
性、耐食性に優れた黒色めっき鋼板の製造において樹脂
被膜を塗布する入側板温を50〜80℃、焼付後の到達
板温を140℃以上とすることを特徴とする密着性、耐
食性に優れた黒色めっき鋼板の製造方法。4. The method according to claim 1, wherein the surface of the zinc alloy plated steel sheet has NO 3 − ,
A current density of 30 in an aqueous solution containing Zn 2+ , Ni 2+ , and Cr 3+
A / dm 2 or more cathodic electrolysis converts chromium compound to Cr
10 to 50 mg / m 2 eutectoid black coating layer, and a Cr layer of 5 to 90 mg / m 2 as Cr on the upper layer,
In the production of a black plated steel sheet having excellent adhesion and corrosion resistance, characterized in that an upper layer is coated with a resin film layer, the temperature of the inlet side sheet where the resin film is applied is 50 to 80 ° C., and the ultimate sheet temperature after baking is 140 ° C. A method for producing a black-plated steel sheet having excellent adhesion and corrosion resistance, characterized in that:
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JP5104602A JP2974878B2 (en) | 1993-04-30 | 1993-04-30 | Black plated steel sheet with excellent adhesion and corrosion resistance and method for producing the same |
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JP5104602A JP2974878B2 (en) | 1993-04-30 | 1993-04-30 | Black plated steel sheet with excellent adhesion and corrosion resistance and method for producing the same |
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Publication Number | Publication Date |
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JPH06316774A JPH06316774A (en) | 1994-11-15 |
JP2974878B2 true JP2974878B2 (en) | 1999-11-10 |
Family
ID=14384975
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JP5104602A Expired - Lifetime JP2974878B2 (en) | 1993-04-30 | 1993-04-30 | Black plated steel sheet with excellent adhesion and corrosion resistance and method for producing the same |
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Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6438890U (en) * | 1987-09-02 | 1989-03-08 |
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1993
- 1993-04-30 JP JP5104602A patent/JP2974878B2/en not_active Expired - Lifetime
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