JP4113039B2 - Manufacturing method of coated chrome-plated TFS steel sheet with excellent appearance - Google Patents
Manufacturing method of coated chrome-plated TFS steel sheet with excellent appearance Download PDFInfo
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- JP4113039B2 JP4113039B2 JP2003129660A JP2003129660A JP4113039B2 JP 4113039 B2 JP4113039 B2 JP 4113039B2 JP 2003129660 A JP2003129660 A JP 2003129660A JP 2003129660 A JP2003129660 A JP 2003129660A JP 4113039 B2 JP4113039 B2 JP 4113039B2
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- plated
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- chemical treatment
- tfs
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Description
【０００１】
本発明は、表面に連続ラインで塗装を行う容器用のクロムめっきＴＦＳ鋼板の製造方法に関するものである。
【０００２】
【従来の技術】
従来、容器用の材料の１つとして、鋼板上にクロムめっきとクロム酸化物を形成させた鋼板が知られており、ＴＦＳ（ティンフリースチール）として一般に製造販売されている。このＴＦＳを製造する方法としては、クロムめっきとクロム酸化物を同一の浴で形成する１ステップ法と、クロムめっきとクロム酸化物を別々の浴で形成する２ステップ法がある。２ステップ法は、めっきおよび化学処理を同一のラインで連続して行うのが通常であり、例えば、冷延油の脱脂や鋼板表面活性化を目的とした酸洗を行った後、めっき浴で金属クロムをめっきし、その後鋼板表面の洗浄を行い、その後、電析助剤としてフッ素、硫酸イオンを使用した化学処理を行う。さらに、その後化学処理液を洗浄し、ドライヤーで乾燥し、防錆のために塗油を行う。
【０００３】
上述のような２ステップ法においては、その後の塗装や、ラミネート処理を行った際の外観や、塗膜や被膜との密着性を確保するために、めっき浴条件とともに化学処理浴の条件の検討が行われており、例えば、特開昭５７−３５６９９号公報（特許文献１）に開示されている。ところで、このＴＦＳは、上記のように塗装を施されて使用される場合が多く、その場合は連続塗装ラインで塗装が行われる場合がある。この場合に、連続して塗装した直後の塗装が鋼板上ではじけ、外観が損なわれる場合があった。
【０００４】
【引用文献】
（１）特許文献１（特開昭５７−３５６９９号公報）
【０００５】
【発明が解決しようとする課題】
本発明は、上記したような、従来でのＴＦＳの表面に連続塗装ラインで塗装を行う際の塗装のはじけの問題を解決した、外観の優れた容器用塗装クロムめっき鋼板の製造方法を提供することにある。
【０００６】
【課題を解決するための手段】
上述したような問題を解消するために、発明者らは鋭意研究を重ねた結果、化学処理浴の硫酸根の濃度を高めとし、化学処理後塗油前の乾燥温度を低めに制御することの組み合せ効果により、上記課題を解決することが出来ることを見出したものである。
その発明の要旨とするところは、鋼板表面に電解処理によって金属クロムをめっきし、化学処理を行って表面に酸化クロムを析出させる２ステップ法で被膜を形成した後、乾燥し、塗油を行い、その後に連続ラインで塗装を行って容器用塗装クロムめっきＴＦＳ（ティンフリースチール）鋼板を製造するに際し、無水クロム酸にＦ - イオンを生成する物質である弗化アンモニウムまたは弗化ナトリウムを添加した化学処理浴中の硫酸根の濃度を７０ｐｐｍ以上１１０ｐｐｍ以下とし、化学処理後塗油前の鋼板の乾燥温度を４０℃以上１２０℃以下とすることを特徴とする外観の優れた容器用塗装クロムめっきＴＦＳ鋼板の製造方法にある。
【０００７】
【発明の実施の形態】
以下、本発明について詳細に説明する。
本発明において、化学処理浴中の硫酸根の濃度は、７０ｐｐｍ以上とする。また、化学処理後乾燥時の鋼板温度は、１２０℃以下とする。この範囲は図１に示す。すなわち、図１は、硫酸根濃度と鋼板温度との関係を示す図である。この図からも判るように硫酸根濃度は７０〜１１０ｐｐｍ、鋼板温度は１２０℃以下、４０℃以上の範囲が良好な範囲である。これらの条件を組み合せることで連続塗装を行った際の塗装はじきが極めて低く押さえられる。その理由は定かではないが、本発明者らは以下のように推定している。
【０００８】
すなわち、従来のプロセスにおいては、化学処理浴におけるクロム酸化物層形成時に、クロムのオキソ錯体の重合による巨大分子が形成され、乾燥時の熱によって、この重合がさらに促進される。巨大分子化したオキソ錯体は鋼板表面に多くのミクロ的な凹凸を形成し、塗料等の液体に対して濡れ性の低い被膜を形成する。連続塗装ラインの如き高速短時間塗装においては、塗装はじき等の塗装不良が発生しやすく、従来のプロセスで製造したＴＦＳは、被膜の濡れ性の低さに起因した塗装はじきが発生しやすい。一方、化学処理液中の硫酸根濃度を高めにし、さらに乾燥温度を低くすることにより、クロムのオキソ錯体の重合を抑制することができる。オキソ錯体の重合を抑制したクロムメッキ鋼板表面は平滑で、液体に対する濡れ性が高く、連続塗装ラインにおいても、塗装はじきの発生を極めて低く抑えることができる。
【０００９】
化学処理液中の硫酸根の温度は、望ましくは７０ｐｐｍ、さらに望ましくは８０ｐｐｍ以上が望ましい。本発明を適用するＴＦＳは、例えば、鋼成分としては、通常、Ｃ：４００〜６００ｐｐｍ、Ｓｉ：０．０２９質量％以下、Ｍｎ：０．２０〜０．３０質量％である。この鋼板を冷延後、脱脂、酸洗などの前処理を施した後、クロムめっきを施す。クロムめっき浴の成分は、無水クロム酸に、通常は、弗化アンモニウムまたは弗化ナトリウムなど、Ｆ- イオンを生成する物質を添加する。めっき量は、通常は５０〜１５０ｍｇ／ｍ2 である。その後化学処理を施す。硫酸根の濃度は上記の通りであるが、他の条件は、無水クロム酸に、通常は、弗化アンモニウムまたは弗化ナトリウムなど、Ｆ- イオンを生成する物質を添加する。その後、化学処理液を洗浄した後乾燥を行い、防錆等のための塗油を行う。さらに、その後、連続塗装ラインにおいて、塗装を行う。塗装には通常エポキシフェノール系の塗料等が使用される。
【００１０】
【実施例】
以下、本発明について実施例によって具体的に説明する。
ＴＦＳ用の鋼板を、表１の条件で化学処理、乾燥を行い、この鋼板にエポキシフェノール系塗料を８５±５ｍｇ／ｄｍ2 塗布した。この場合の塗装はじきの発生量を表１に示す。この表に示すように、Ｎｏ．１〜２は本発明例であり、Ｎｏ．３〜４は比較例である。比較例Ｎｏ．３は硫酸根濃度が低く、かつ鋼板温度が高いために、はじき発生が生じ、また、比較例Ｎｏ．４は硫酸根濃度が低いために、はじきの発生がある。これに対し、本発明の場合はいずれも、はじきの発生が見られなかった。
【００１１】
【表１】
【発明の効果】
以上述べたように、本発明によると、ＴＦＳの表面に連続塗装ラインで塗装を行う際の塗装のはじきを防止することができ、その工業的な意義は極めて大きいものである。
【図面の簡単な説明】
【図１】硫酸根濃度と鋼板温度との関係を示す図である。[0001]
The present invention relates to a method for producing a chromium-plated TFS steel sheet for a container that is coated on a surface with a continuous line.
[0002]
[Prior art]
Conventionally, a steel plate in which chromium plating and chromium oxide are formed on a steel plate is known as one of the materials for containers, and is generally manufactured and sold as TFS (Tin Free Steel). As a method of manufacturing this TFS, there are a one-step method in which chromium plating and chromium oxide are formed in the same bath, and a two-step method in which chromium plating and chromium oxide are formed in separate baths. In the two-step method, plating and chemical treatment are usually performed continuously in the same line. For example, after performing pickling for the purpose of degreasing cold rolled oil and activating the steel sheet surface, Metal chromium is plated, and then the surface of the steel sheet is cleaned, and then chemical treatment using fluorine and sulfate ions as an electrodeposition aid is performed. Further, the chemical treatment liquid is then washed, dried with a dryer, and oiled for rust prevention.
[0003]
In the two-step method as described above, the conditions of the chemical treatment bath as well as the plating bath conditions are examined in order to ensure the appearance when the subsequent coating and laminating processes are performed, and the adhesion to the coating film and coating film. For example, it is disclosed by Unexamined-Japanese-Patent No. 57-35699 (patent document 1). By the way, this TFS is often used after being coated as described above, and in that case, painting may be performed in a continuous coating line. In this case, the coating immediately after the continuous coating may occur on the steel plate and the appearance may be impaired.
[0004]
[Cited document]
(1) Patent Document 1 (Japanese Patent Laid-Open No. 57-35699)
[0005]
[Problems to be solved by the invention]
The present invention provides a method for producing a coated chrome-plated steel sheet for a container having an excellent appearance, which solves the problem of paint splashing when the surface of a conventional TFS is coated on a continuous coating line as described above. There is.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the inventors have conducted intensive research. As a result, the concentration of sulfate radicals in the chemical treatment bath is increased, and the drying temperature before oiling after chemical treatment is controlled lower. The present inventors have found that the above problems can be solved by a combination effect.
Has as subject matter of the invention, plated with metallic chromium by electrolytic treatment of the steel sheet surface, after forming a film in a two-step method Ru precipitating chromium oxide on the surface subjected to chemical treatment, dried, and oiling After that, when coating chrome-plated chrome-plated TFS (tin-free steel) steel sheet for containers by coating on a continuous line, ammonium fluoride or sodium fluoride, a substance that generates F - ions, is added to chromic anhydride. The coating chromium for containers with excellent appearance, characterized in that the concentration of sulfate radical in the chemical treatment bath is 70 ppm to 110 ppm and the drying temperature of the steel plate after chemical treatment and before oil application is 40 ° C. to 120 ° C. It exists in the manufacturing method of a plating TFS steel plate.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
In the present invention, the concentration of the sulfate radical in the chemical treatment bath is 70 ppm or more. Moreover, the steel plate temperature at the time of drying after chemical treatment shall be 120 degrees C or less. This range is shown in FIG. That is, FIG. 1 is a diagram showing the relationship between the sulfate radical concentration and the steel plate temperature. As can be seen from this figure, the sulfate group concentration is 70 to 110 ppm, the steel sheet temperature is 120 ° C. or lower, and the range of 40 ° C. or higher is a good range. By combining these conditions, the repelling during continuous coating is extremely low. Although the reason is not certain, the present inventors presume as follows.
[0008]
That is, in the conventional process, when the chromium oxide layer is formed in the chemical treatment bath, a macromolecule is formed by polymerization of the chromium oxo complex, and this polymerization is further promoted by heat during drying. The macromolecularized oxo complex forms many microscopic irregularities on the surface of the steel sheet and forms a film having low wettability with respect to a liquid such as a paint. In high-speed and short-time coating such as a continuous coating line, coating defects such as coating repelling are likely to occur, and TFS produced by a conventional process is likely to cause coating repelling due to low wettability of the coating. On the other hand, the polymerization of the chromium oxo complex can be suppressed by increasing the sulfate group concentration in the chemical treatment solution and lowering the drying temperature. The surface of the chromium-plated steel sheet, in which the polymerization of the oxo complex is suppressed, is smooth and has high wettability with respect to liquids, and the occurrence of coating repellency can be suppressed to a very low level even in a continuous coating line.
[0009]
The temperature of the sulfate radical in the chemical treatment liquid is desirably 70 ppm, more desirably 80 ppm or more. The TFS to which the present invention is applied is, for example, usually steel: C: 400 to 600 ppm, Si: 0.029% by mass or less, and Mn: 0.20 to 0.30% by mass. After cold rolling the steel sheet, pretreatment such as degreasing and pickling is performed, followed by chrome plating. As a component of the chromium plating bath, a substance that generates F - ions such as ammonium fluoride or sodium fluoride is usually added to chromic anhydride. Plating amount is usually a 50 to 150 mg / m 2. Then chemical treatment is applied. The concentration of the sulfate radical is as described above, but the other condition is that a substance that generates F - ions such as ammonium fluoride or sodium fluoride is usually added to chromic anhydride. Thereafter, the chemical treatment liquid is washed and then dried, and oiling for rust prevention or the like is performed. After that, painting is performed in a continuous painting line. Epoxyphenol paints are usually used for painting.
[0010]
【Example】
Hereinafter, the present invention will be specifically described with reference to examples.
A steel plate for TFS was chemically treated and dried under the conditions shown in Table 1, and an epoxyphenol-based paint was applied to this steel plate at 85 ± 5 mg / dm 2 . Table 1 shows the amount of paint repellence in this case. As shown in this table, no. 1-2 are examples of the present invention. 3 to 4 are comparative examples. Comparative Example No. No. 3 has a low sulfate radical concentration and a high steel plate temperature, so that repelling occurs. Since No. 4 has a low sulfate radical concentration, repelling occurs. On the other hand, in the case of the present invention, no occurrence of repelling was observed.
[0011]
[Table 1]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent the repelling of the coating when the TFS surface is coated on the continuous coating line, and its industrial significance is extremely great.
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between sulfate radical concentration and steel plate temperature.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003129660A JP4113039B2 (en) | 2003-05-08 | 2003-05-08 | Manufacturing method of coated chrome-plated TFS steel sheet with excellent appearance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003129660A JP4113039B2 (en) | 2003-05-08 | 2003-05-08 | Manufacturing method of coated chrome-plated TFS steel sheet with excellent appearance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004332048A JP2004332048A (en) | 2004-11-25 |
| JP4113039B2 true JP4113039B2 (en) | 2008-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003129660A Expired - Fee Related JP4113039B2 (en) | 2003-05-08 | 2003-05-08 | Manufacturing method of coated chrome-plated TFS steel sheet with excellent appearance |
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| Country | Link |
|---|---|
| JP (1) | JP4113039B2 (en) |
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- 2003-05-08 JP JP2003129660A patent/JP4113039B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP2004332048A (en) | 2004-11-25 |
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