JPH05214582A - Manufacture of electroplated steel sheet excellent in chemical convertibility - Google Patents
Manufacture of electroplated steel sheet excellent in chemical convertibilityInfo
- Publication number
- JPH05214582A JPH05214582A JP1790292A JP1790292A JPH05214582A JP H05214582 A JPH05214582 A JP H05214582A JP 1790292 A JP1790292 A JP 1790292A JP 1790292 A JP1790292 A JP 1790292A JP H05214582 A JPH05214582 A JP H05214582A
- Authority
- JP
- Japan
- Prior art keywords
- plating
- steel sheet
- sided
- chemical conversion
- electroplating
- 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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- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、非電気メッキ面側の化
成処理性に優れた片面電気メッキ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 single-sided electroplated steel sheet having excellent chemical conversion treatability on the non-electroplated surface side.
【０００２】[0002]
【従来の技術】近年では、自動車用鋼板として、金属ま
たは合金の各種電気メッキ鋼板が使用されるようになっ
ている。このような電気メッキ鋼板には両面電気メッキ
鋼板と片面電気メッキ鋼板とがある。ところで、自動車
用鋼板とりわけ車体外板用鋼板として電気メッキ鋼板を
用いる場合には、主として、その外面 (自動車の外面を
構成する面) には塗装後における優れた外観が、その内
面 (自動車の内面を構成する面) には優れた耐食性が、
それぞれ求められる。そこで、従来より、車体外板用鋼
板として片面電気メッキ鋼板を用い、メッキ面側を内面
側、非メッキ面側を外面側とすることにより、塗装面
(非メッキ面) の外観を確保していた。2. Description of the Related Art In recent years, various electroplated steel sheets of metal or alloy have been used as steel sheets for automobiles. Such electroplated steel sheets include double-sided electroplated steel sheets and single-sided electroplated steel sheets. By the way, when an electroplated steel sheet is used as a steel sheet for automobiles, especially as a steel sheet for vehicle outer panels, the outer surface (the surface that constitutes the outer surface of the vehicle) of which the excellent appearance after painting is mainly the inner surface (the inner surface of the vehicle) Has excellent corrosion resistance.
Each is required. Therefore, conventionally, a single-sided electroplated steel plate is used as a steel plate for a vehicle body outer plate, and the coated surface is the inner surface side and the non-plated surface side is the outer surface side.
The appearance of (non-plated surface) was secured.
【０００３】ところで、片面電気メッキ鋼板の製造にお
いて、片面メッキは、例えば (i) 鋼板の片面にメッキを阻止する薬液を予め塗布して
電気メッキを行い、メッキ後塗布面をブラッシロール等
で剥離する剥離剤塗布法や(ii)両面電気メッキ鋼板を次
工程に設置された研摩機によって片面のみを機械的に研
削除去する機械的研削法といった公知の片面メッキ法を
用いることにより容易に実施できる。しかし、片面電気
メッキにおいては、メッキ液により非メッキ面が酸焼け
(酸化皮膜を形成する現象) されるため、化成処理性が
低下してしまうという問題があった。By the way, in the production of a single-sided electroplated steel sheet, for the single-sided plating, for example, (i) a single side of the steel sheet is preliminarily coated with a chemical solution that prevents plating, electroplating is performed, and the coated surface is peeled off by a brush roll or the like. It can be easily carried out by using a known single-sided plating method such as a stripping agent coating method or (ii) a mechanical grinding method of mechanically grinding and removing only one side of a double-sided electroplated steel sheet by a polishing machine installed in the next step. . However, in single-sided electroplating, the non-plated surface is acid burned by the plating solution.
(Phenomenon of forming an oxide film) is caused, so that there is a problem that the chemical conversion treatment property is deteriorated.
【０００４】そこで、従来は、片面電気メッキ鋼板の製
造に際しては、非メッキ面の化成処理性を確保するため
に、メッキ後にブラシを用いて酸焼け部を除去する方
法、メッキ液中に添加剤を入れて酸焼けを防止する方法
さらには事前に薄メッキを行ってメッキ後に薄メッキを
除去する方法等が行われていた。また特開昭56−102585
号公報には、再結晶焼鈍後の冷延コイルを、Coイオン、
Niイオン、Snイオンの１種または２種以上を１×10-3〜
0.1mol/l含む塩酸または硫酸水溶液により酸洗すること
により、微細・緻密な化成結晶を得ることができる方法
が提案されている。Therefore, conventionally, in the production of a single-sided electroplated steel sheet, in order to ensure the chemical conversion treatment property of the non-plated surface, a method of removing the acid burned portion with a brush after plating, an additive in the plating solution In order to prevent acid burn, a method of performing thin plating in advance and removing the thin plating after plating has been used. Also, JP-A-56-102585
In the gazette, a cold rolled coil after recrystallization annealing, Co ions,
1 × 10 −3 or more of one or more of Ni ion and Sn ion
A method has been proposed in which fine and dense chemical conversion crystals can be obtained by pickling with an aqueous solution of hydrochloric acid or sulfuric acid containing 0.1 mol / l.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、これら
の方法には以下に示すような問題がある。メッキ後に酸
焼け部をブラシで除去する方法では、酸焼けの程度や下
地の粗さ等に合わせて研削の程度を変更することが必要
であるが、これは殆ど実現不可能であるため、完全に酸
焼け部を除去することができない。メッキ液中に添加剤
を入れて酸焼けを防止する方法では、添加剤がメッキ性
状に悪影響 (例えば結晶構成や皮膜組成の変化) を与え
る場合がある。However, these methods have the following problems. In the method of removing the acid burned part with a brush after plating, it is necessary to change the degree of grinding according to the degree of acid burnt, the roughness of the base, etc. The acid burned part cannot be removed. In the method of preventing acid burn by adding an additive to the plating solution, the additive may adversely affect the plating property (for example, change in crystal composition or film composition).
【０００６】事前に薄メッキを行ってメッキ後に薄メッ
キを除去する方法では、メッキ残りにより化成処理性が
低下するという問題がある。さらに、特開昭56−102585
号公報により提案された方法では、連続ラインでは処理
時間がバラツクため化成処理性が安定しないという問題
があり、その改善が望まれている。ここに、本発明の目
的は、非電気メッキ面側の化成処理性に優れた片面電気
メッキ鋼板の製造法を提供することにある。In the method of performing thin plating in advance and removing the thin plating after plating, there is a problem that chemical conversion processability is deteriorated due to residual plating. Furthermore, JP-A-56-102585
The method proposed by the publication has a problem that the chemical conversion processability is not stable because the processing time varies in a continuous line, and its improvement is desired. It is an object of the present invention to provide a method for producing a single-sided electroplated steel sheet having excellent chemical conversion treatability on the non-electroplated surface side.
【０００７】[0007]
【課題を解決するための手段】本発明者は、上記課題を
解決するため検討を重ねた結果、片面電気メッキを行う
前に、非メッキ面に微量のNiメッキを行うことに着目し
た。そして、このNiメッキを行った後に非メッキ面に片
面電気メッキを行うことによりメッキ液による非メッキ
面の酸焼けを防止することができ、さらに電気メッキ後
に軽度の圧下を行うことにより非メッキ面の化成処理性
を向上させることができることを知見して、本発明を完
成した。As a result of repeated studies to solve the above problems, the present inventor has noticed that a slight amount of Ni plating is performed on the non-plated surface before performing the single-sided electroplating. Then, after performing this Ni plating, it is possible to prevent acid burning of the non-plated surface by the plating solution by performing single-sided electroplating on the non-plated surface, and by performing a slight reduction after the electroplating, the non-plated surface The present invention was completed by finding that the chemical conversion treatability of can be improved.
【０００８】ここに、本発明の要旨とするところは、鋼
板の少なくとも片面に付着量0.05〜0.2 g/m2のNiメッキ
を施し、片面にNiメッキを施した場合にはこのNiメッキ
面が非メッキ面になるように、また両面にNiメッキを施
した場合にはいずれかの面に、望ましくは電気純Znメッ
キまたは電気Zn−Ni合金メッキの片面電気メッキを施
し、さらに伸び率0.05％以上１％以下の圧下を行うこと
を特徴とする化成処理性に優れた片面電気メッキ鋼板の
製造法である。すなわち、本発明にかかる化成処理性に
優れた片面電気メッキ鋼板の製造法によれば、以下に示
す工程が提供される。Here, the gist of the present invention is that at least one surface of a steel plate is plated with Ni with an adhesion amount of 0.05 to 0.2 g / m 2 , and when one surface is plated with Ni, this Ni-plated surface is As a non-plated surface, and when Ni plating is applied on both sides, either surface is preferably electro-pure Zn plating or electro Zn-Ni alloy plating, and one side electroplating is applied, and the elongation is 0.05%. This is a method for producing a single-sided electroplated steel sheet having excellent chemical conversion treatability, which is characterized by performing a reduction of 1% or less. That is, according to the method for producing a single-sided electroplated steel sheet having excellent chemical conversion treatability according to the present invention, the following steps are provided.
【０００９】[0009]
【数１】 [Equation 1]
【００１０】以下、各工程について適用範囲、対象を簡
単に説明する。 (i) 冷延鋼板 使用される冷延鋼板は、通常、電気メッキ母材として使
用されるものであればよく、鋼種、焼鈍方法等は限定を
要さない。 (ii)Niメッキ Niメッキは、片面当たりの付着量：0.05〜0.2g/m2 が確
保できればよく、電気メッキであるか化学メッキである
かといったメッキ方法については何ら限定を要さない。The applicable range and object of each process will be briefly described below. (i) Cold-rolled steel plate The cold-rolled steel plate used may be any one that is normally used as an electroplating base material, and the steel type, annealing method, etc. are not limited. (ii) Ni Plating Ni plating needs only to secure an adhesion amount per one side: 0.05 to 0.2 g / m 2 , and the plating method such as electroplating or chemical plating does not require any limitation.
【００１１】(iii) 片面電気メッキ 電気メッキの前処理は、通常行われているアルカリ脱脂
や電解酸洗等のいずれの方法を用いてもよく、特定の手
段に限定する必要はない。なお、片面電気メッキのメッ
キ面は、Niメッキが片面メッキの場合は非Niメッキ面と
し、Niメッキが両面メッキの場合はいずれか一方の面と
する。 (iv)圧下 伸び率を0.05％以上確保することができる圧下であれば
よく、何ら限定を要さない。例えばインラインラベラー
での圧下であってもよい。(Iii) Single-sided electroplating The pretreatment for electroplating may be performed by any of the commonly used methods such as alkaline degreasing and electrolytic pickling, and it is not necessary to limit it to a specific means. The single-sided electroplated surface is a non-Ni-plated surface when the Ni plating is a single-sided plating, and is one of the surfaces when the Ni plating is a double-sided plating. (iv) Reduction There is no limitation as long as it is a reduction that can secure an elongation rate of 0.05% or more. For example, the pressure may be reduced by an in-line labeler.
【００１２】[0012]
【作用】以下、本発明を作用効果とともに詳述する。本
発明において、冷延鋼板の少なくとも片面にNiメッキを
施すのは、後続する片面電気メッキ時に、非電気メッキ
面の酸焼けを防止するとともに、この面の化成処理性を
向上させるためである。すなわち、NiはZnやFeに比較す
ると電気化学的に貴であるため、メッキ液中でも酸焼け
されないのである。本発明において、Niメッキの付着量
の下限を0.05g/m2としたのは、これよりも付着量が少な
いと、非電気メッキ面を完全にNiで覆うことができなく
なり、部分的に表面に露出した非電気メッキ面が酸によ
って浸食され、化成処理性が低下するからである。ま
た、Niメッキの付着量の上限を0.2 g/m2としたのは、こ
れを越えて付着させると後の工程で余分な伸び率の圧下
を行う必要があり、経済的に不利となる。The operation of the present invention will be described in detail below. In the present invention, at least one surface of the cold-rolled steel sheet is plated with Ni in order to prevent acid burning of the non-electroplated surface and improve the chemical conversion treatability of this surface during the subsequent one-sided electroplating. That is, Ni is electrochemically noble compared to Zn and Fe, and therefore is not acid-baked even in the plating solution. In the present invention, the lower limit of the adhesion amount of Ni plating is set to 0.05 g / m 2, and if the adhesion amount is less than this, the non-electroplated surface cannot be completely covered with Ni, and the surface is partially This is because the non-electroplated surface exposed at the surface is corroded by the acid and the chemical conversion treatment property is deteriorated. Further, the reason why the upper limit of the amount of Ni plating deposited is set to 0.2 g / m 2 is that it is economically disadvantageous if it is deposited beyond this amount, because it is necessary to reduce the extra elongation rate in a later step.
【００１３】次に、片面にNiメッキを行った場合にはこ
のNiメッキ面が非メッキ面になるように、また両面にNi
メッキを行った場合にはいずれかの面に、片面電気メッ
キを行う。この電気メッキは、自動車用鋼板として要求
される耐食性を確保するために行われるものであり、メ
ッキ方法、付着量等は公知の範囲であればよく、何ら限
定を要さない。そして、本発明では、電気メッキ後に0.
05％以上１％以下の伸び率で圧下、例えばレベラー圧下
を行う。すなわち、鋼板の表面が完全にNiメッキ被膜で
覆われていると化成処理を行うことはできない。そこ
で、本発明では例えばレベラーにより圧下を行うことに
よりNiメッキ被膜に適度のクラックを形成させて、化成
処理性を改善する。Next, when Ni plating is performed on one side, the Ni-plated surface should be a non-plated surface, and both sides should be Ni-plated.
When plating is performed, one side is electroplated on one side. This electroplating is carried out in order to ensure the corrosion resistance required for a steel sheet for automobiles, and the plating method, the amount of adhesion, etc. may be within the known range, and no limitation is required. And in the present invention, after electroplating 0.
Rolling is performed at an elongation rate of 05% or more and 1% or less, for example, leveler rolling. That is, chemical conversion treatment cannot be performed if the surface of the steel sheet is completely covered with the Ni plating film. Therefore, in the present invention, for example, reduction is performed by a leveler to form appropriate cracks in the Ni-plated coating to improve chemical conversion treatability.
【００１４】Niメッキ被膜にクラックが入ることにより
素地のFe面が露出し、Fe面とNiメッキ被膜との間で電池
が形成されるようになり、化成結晶の核の生成が促進さ
れる。したがって、本発明によれば、化成処理性が向上
する。なお、両面にNiメッキを行い、さらに片面に電気
メッキを行った場合、（Niメッキ）＋（片面電気メッ
キ）面側は、圧下を行っても何ら問題はない。圧下の際
の伸び率を0.05％以上としたのは、これよりも小さいと
Niメッキにクラックが入らないため化成処理性の向上が
図られないからであり、一方１％超の伸び率の圧下を行
うと母材特性値の劣化が起こるためである。そこで、本
発明では圧延時の伸び率は0.05％以上１％以下と限定す
る。By cracking the Ni plating film, the Fe surface of the base material is exposed, a battery is formed between the Fe surface and the Ni plating film, and generation of nuclei of chemical conversion crystals is promoted. Therefore, according to the present invention, the chemical conversion treatability is improved. When both sides are plated with Ni and one side is electroplated, there is no problem even if the (Ni plating) + (single-sided electroplating) side is rolled down. The elongation at the time of rolling down is set to 0.05% or more when it is smaller than this.
This is because the Ni plating is not cracked and therefore the chemical conversion processability cannot be improved, while the reduction of the elongation rate of more than 1% causes deterioration of the base material characteristic values. Therefore, in the present invention, the elongation percentage during rolling is limited to 0.05% or more and 1% or less.
【００１５】このようにして、本発明によれば、非電気
メッキ面側の化成処理性に優れた片面電気メッキ鋼板の
製造法を提供することが可能となる。さらに、本発明を
実施例を参照しながら説明するが、これは本発明の例示
であり、これにより本発明が限定されるものではない。As described above, according to the present invention, it is possible to provide a method for producing a single-sided electroplated steel sheet having excellent chemical conversion treatability on the non-electroplated surface side. Further, the present invention will be described with reference to examples, which are illustrative of the present invention and are not intended to limit the present invention.
【００１６】[0016]
【実施例】板厚0.8 mmの鋼板を準備し、この鋼板の片面
に表１に示すメッキ浴を用いて電気Niメッキを行った。Example A steel plate having a plate thickness of 0.8 mm was prepared, and one surface of this steel plate was electroplated with Ni using the plating bath shown in Table 1.
【００１７】[0017]
【表１】 [Table 1]
【００１８】なお、この電気Niメッキでの電流密度は２
〜４A/dm2 とし、Ni付着量は通電量をコントロールする
ことにより調整した。また、この片面メッキは剥離剤塗
布法により行った。このようにしてNiメッキを行った鋼
板に、通常の条件のアルカリ脱脂および酸洗を行い、表
２に示すメッキ浴を用いて非Niメッキ面に片面電気メッ
キを行った。The current density in this electric Ni plating is 2
And ~4A / dm 2, Ni deposition amount was adjusted by controlling the amount of energization. Further, this one-sided plating was performed by a release agent coating method. The Ni-plated steel sheet was subjected to alkaline degreasing and pickling under normal conditions, and the non-Ni-plated surface was subjected to single-sided electroplating using the plating bath shown in Table 2.
【００１９】[0019]
【表２】 [Table 2]
【００２０】なお、片面電気メッキにおいては、メッキ
液中のZn2+、Ni2+の濃度をそれぞれコントロールするこ
とによりメッキ組成を、また通電量をコントロールする
ことにより付着量をそれぞれ調整した。最後に、レベラ
ーを通して伸び率が0.01％から0.1 ％の範囲で圧下を行
って、片面電気メッキ鋼板を製造した。In single-sided electroplating, the plating composition was controlled by controlling the concentrations of Zn 2+ and Ni 2+ in the plating solution, and the amount of deposition was adjusted by controlling the amount of energization. Finally, a single-sided electroplated steel sheet was produced by rolling through a leveler in the range of elongation of 0.01% to 0.1%.
【００２１】このようにして製造された片面電気メッキ
鋼板について、化成処理性を評価した。ここで化成処理
性は、日本パーカーライジング社製ボンデライト3030を
用いて２分間浸漬し、化成付着量および化成結晶の大き
さ、被覆率を測定することにより、化成処理性を総合的
に判定した。結果を表３にまとめて示す。なお、表３に
おいては、化成付着量：1.5 〜2.5 g/m2、化成結晶の大
きさ：１〜２μm 、被覆率：100 ％をそれぞれ合格と
し、さらに総合評価ではこれらが全て合格のものを○と
し、ひとつでも合格でないものは×として示した。The single-sided electroplated steel sheet thus produced was evaluated for chemical conversion treatability. Here, the chemical conversion treatability was comprehensively judged by immersing it in Bonderite 3030 manufactured by Nippon Parker Rising Co., Ltd. for 2 minutes and measuring the amount of chemical conversion adhesion, the size of the chemical conversion crystals and the coverage. The results are summarized in Table 3. In addition, in Table 3, the amount of chemical conversion adhesion: 1.5 to 2.5 g / m 2 , the size of the chemical conversion crystals: 1 to 2 μm, and the coverage rate: 100% were passed, respectively. The results are shown as ◯, and those that do not pass even one are shown as x.
【００２２】[0022]
【表３】 [Table 3]
【００２３】表３から明らかなように、本発明の範囲を
全て満足する試料は優れた化成処理性を備えていた。ま
た、これらの試料は自動車用鋼板として必要な耐食性を
備えていることも分かった。これに対し、本発明の範囲
を満足しない条件で製造された試料は、化成処理性が不
足していることがわかる。As is clear from Table 3, the samples satisfying all the ranges of the present invention had excellent chemical conversion treatability. It was also found that these samples have the corrosion resistance required for steel sheets for automobiles. On the other hand, it is understood that the samples manufactured under the conditions that do not satisfy the scope of the present invention have insufficient chemical conversion treatability.
【００２４】[0024]
【発明の効果】以上詳述したように、本発明によれば、
メッキ時の酸焼けを防止して非メッキ面側の化成処理性
に優れた片面電気メッキ鋼板を容易かつ確実に製造する
ことができる。かかる効果を有する本発明の意義は極め
て著しい。As described in detail above, according to the present invention,
It is possible to easily and reliably manufacture a single-sided electroplated steel sheet that prevents acid burning during plating and has excellent chemical conversion treatment properties on the non-plated surface side. The significance of the present invention having such effects is extremely remarkable.
Claims (2)
2 g/m2のNiメッキを施し、片面にNiメッキを施した場合
にはこのNiメッキ面が非メッキ面になるように、また両
面にNiメッキを施した場合にはいずれかの面に、片面電
気メッキを施し、さらに伸び率0.05％以上１％以下の圧
下を行うことを特徴とする化成処理性に優れた片面電気
メッキ鋼板の製造法。1. An amount of adhesion of at least one side of a steel plate of 0.05 to 0.
When 2 g / m 2 of Ni plating is applied and Ni plating is applied on one side, this Ni plating surface becomes the non-plating surface, and when Ni plating is applied on both sides, either surface is applied. A method for producing a single-sided electroplated steel sheet having excellent chemical conversion treatability, which comprises performing single-sided electroplating and further performing a rolling reduction of not less than 0.05% and not more than 1%.
または電気Zn−Ni合金メッキである請求項１記載の化成
処理性に優れた片面電気メッキ鋼板の製造法。2. The method for producing a single-sided electroplated steel sheet having excellent chemical conversion treatability according to claim 1, wherein the single-sided electroplating is electroless Zn plating or electroless Zn-Ni alloy plating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1790292A JPH05214582A (en) | 1992-02-03 | 1992-02-03 | Manufacture of electroplated steel sheet excellent in chemical convertibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1790292A JPH05214582A (en) | 1992-02-03 | 1992-02-03 | Manufacture of electroplated steel sheet excellent in chemical convertibility |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05214582A true JPH05214582A (en) | 1993-08-24 |
Family
ID=11956678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1790292A Withdrawn JPH05214582A (en) | 1992-02-03 | 1992-02-03 | Manufacture of electroplated steel sheet excellent in chemical convertibility |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05214582A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0849091A (en) * | 1994-08-03 | 1996-02-20 | Sumitomo Metal Ind Ltd | Production of electrogalvanized steel sheet |
-
1992
- 1992-02-03 JP JP1790292A patent/JPH05214582A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0849091A (en) * | 1994-08-03 | 1996-02-20 | Sumitomo Metal Ind Ltd | Production of electrogalvanized steel sheet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990518 |