JP5962168B2 - Manufacturing method of high-lubrication hot-dip galvanized steel sheet with excellent appearance - Google Patents
Manufacturing method of high-lubrication hot-dip galvanized steel sheet with excellent appearance Download PDFInfo
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本発明は、酸化膜の変色を防止することが可能な外観性に優れた高潤滑溶融亜鉛めっき鋼板の製造方法に関するものである。 The present invention relates to a method for producing a highly lubricated hot-dip galvanized steel sheet having excellent appearance that can prevent discoloration of an oxide film.
表面に高潤滑の酸化膜を形成させた溶融亜鉛めっき鋼板（以下、高潤滑溶融亜鉛めっき鋼板と称す）は、図1に示すように、鋼板表面に酸性処理液を塗布した後所定時間放置することで溶融亜鉛めっき鋼板と酸性処理液との化学反応により鋼板表面に酸化膜が形成し製造される（以下、このような処理をＪＡＺ処理と称す）。
しかしながら、所定時間放置し、洗浄、乾燥工程終了後に、鋼板表面に微量な水分が残留していると酸化膜の酸化がさらに進行して表面が変色する問題がある。
A hot-dip galvanized steel sheet (hereinafter referred to as a high-lubrication hot-dip galvanized steel sheet) on which a highly lubricated oxide film is formed is left for a predetermined time after applying an acidic treatment solution to the steel sheet surface as shown in FIG. Thus, an oxide film is formed on the surface of the steel sheet by a chemical reaction between the hot-dip galvanized steel sheet and the acidic treatment liquid (hereinafter, such treatment is referred to as JAZ treatment).
However, if a trace amount of moisture remains on the surface of the steel sheet after being left for a predetermined time and after the cleaning and drying process, the oxidation of the oxide film further proceeds and the surface is discolored.
これに対して、酸化膜の変色を防止し外観性に優れた高潤滑溶融亜鉛めっき鋼板の製造方法は未だ提案されていない。 On the other hand, a method for producing a highly lubricated hot-dip galvanized steel sheet that prevents discoloration of the oxide film and has excellent appearance has not been proposed yet.
本発明は、かかる事情に鑑みてなされたもので、外観性に優れた高潤滑溶融亜鉛めっき鋼板の製造方法を提供することを目的とする。 This invention is made | formed in view of this situation, and it aims at providing the manufacturing method of the high lubricity hot-dip galvanized steel plate excellent in the external appearance property.
本発明は、洗浄、乾燥後に残留水分の測定を行い、高潤滑溶融亜鉛めっき鋼板表面の水分量を所定値以下にすることが表面変色防止に対し有効であることを知見した。
本発明の要旨は以下のとおりである。
溶融亜鉛めっき鋼板表面に酸性処理液を塗布し、所定時間放置した後、洗浄、乾燥を経て、前記溶融亜鉛めっき鋼板表面に酸化膜を形成させる溶融亜鉛めっき鋼板の製造方法において、前記洗浄、乾燥終了後、前記溶融亜鉛めっき鋼板表面の水膜厚もしくは水分量を測定し、次いで、前記水膜厚が５μｍ以下もしくは水分量が５ｇ／ｍ２以下となるように乾燥を行うことを特徴とする外観性に優れた溶融亜鉛めっき鋼板の製造方法。
The present invention has been found that it is effective for preventing surface discoloration by measuring the residual moisture after washing and drying, and setting the moisture content on the surface of the highly lubricated hot-dip galvanized steel sheet to a predetermined value or less.
The gist of the present invention is as follows.
In the method for producing a hot dip galvanized steel sheet, an acidic treatment solution is applied to the surface of the hot dip galvanized steel sheet, left for a predetermined time, and then washed and dried to form an oxide film on the surface of the hot dip galvanized steel sheet. After completion, the water film thickness or moisture content on the surface of the hot dip galvanized steel sheet is measured, and then the drying is performed so that the water film thickness is 5 μm or less or the water content is 5 g / m 2 or less. A method for producing hot-dip galvanized steel sheets with excellent appearance.
本発明によれば、外観性に優れた高潤滑溶融亜鉛めっき鋼板を得ることができる。
さらに、変色発生前に異常を検知することが可能となり、大量の品質不良発生の予防につながる。
According to the present invention, a highly lubricated hot-dip galvanized steel sheet having excellent appearance can be obtained.
Furthermore, it becomes possible to detect an abnormality before the occurrence of discoloration, leading to the prevention of a large number of quality defects.
以下、本発明を詳細に説明する。
本発明は、溶融亜鉛めっき鋼板表面に酸性処理液を塗布し、所定時間放置した後、洗浄、乾燥を経て、溶融亜鉛めっき鋼板表面に酸化膜を形成させる高潤滑溶融亜鉛めっき鋼板の製造方法である。そして、洗浄、乾燥工程終了後、溶融亜鉛めっき鋼板表面の水膜厚もしくは水分量を測定し、次いで、前記水膜厚もしくは水分量が所定値以下となるように乾燥を行うことを特徴とする。
Hereinafter, the present invention will be described in detail.
The present invention is a method for producing a highly lubricated hot dip galvanized steel sheet in which an acidic treatment solution is applied to the surface of a hot dip galvanized steel sheet, left for a predetermined time, and after washing and drying, an oxide film is formed on the surface of the hot dip galvanized steel sheet. is there. And after completion | finish of a washing | cleaning and a drying process, the water film thickness or water | moisture content of the hot dip galvanized steel plate surface is measured, and then it dries so that the said water film thickness or water | moisture content may become below a predetermined value, It is characterized by the above-mentioned. .
所定時間放置した後、洗浄、乾燥終了後に、溶融亜鉛めっき鋼板表面に微量な水分が残留していると溶融亜鉛めっき鋼板表面の酸化膜の酸化がさらに進行して、図２に示すように表面が変色する。そこで、この表面の変色について、詳細に検討した。図３は、水膜厚と酸化膜の変色発生との関係を示す図である。なお、水膜厚の測定は、後述する実施例と同様の方法にて行った。また、酸化膜の変色が発生しているかどうかの判別は目視にて行った。 If a trace amount of water remains on the surface of the hot dip galvanized steel sheet after it has been left for a predetermined time, washed and dried, oxidation of the oxide film on the surface of the hot dip galvanized steel sheet further proceeds, as shown in FIG. Changes color. Therefore, this surface discoloration was examined in detail. FIG. 3 is a diagram showing the relationship between the water film thickness and the occurrence of discoloration of the oxide film. In addition, the measurement of the water film thickness was performed by the method similar to the Example mentioned later. Further, whether or not the oxide film was discolored was visually determined.
図３によると、水膜厚が1μm程度であれば、変色は発生しないが、水膜厚が6μm（水分量で6g／m2に相当）から変色が発生している。仮に目視で判別できる程度に水分が付着しているのであれば鋼板表面を目視にて検査することで変色するかどうかの判定は可能である。しかし、実際には目視でほとんど色調差の見られない厚み6μm程度の水膜厚が残留しているだけで変色が発生することになる。 According to FIG. 3, discoloration does not occur when the water film thickness is about 1 μm, but discoloration occurs when the water film thickness is 6 μm (corresponding to 6 g / m 2 in water content). If moisture is attached to such an extent that it can be visually discerned, it is possible to determine whether the color changes by visually inspecting the steel sheet surface. However, in actuality, discoloration occurs only by leaving a water film thickness of about 6 μm with almost no color difference visually observed.
また、さらに検討を進めた結果、変色はすぐには起こらず、2〜3日経過してから変色する場合もあった。さらに、溶融亜鉛めっき鋼板は、製造工程において、通常さび止め、潤滑のための塗油がされるが、鋼板表面上に水分が残留する場合は、上層にさび止め、塗油を施しても、酸化反応は進行し、変色を抑止することはできなかった。 Further, as a result of further investigation, discoloration did not occur immediately, and discoloration sometimes occurred after 2 to 3 days. Furthermore, the hot dip galvanized steel sheet is usually coated with oil for rust prevention and lubrication in the manufacturing process, but if moisture remains on the steel sheet surface, even if rust prevention and oiling are applied to the upper layer, The oxidation reaction proceeded and discoloration could not be suppressed.
以上の結果、変色発生要因としては鋼板表面に残留する水分が考えられ、洗浄、乾燥後に変色発生要因である鋼板表面に残留する水分量を定期的に測定し、所定値以下に抑えることが変色防止に有効であるとの知見を得た。なお、所定値とは水膜厚が5μｍ以下（水分量で5ｇ／ｍ２以下）であり、図3の結果より、鋼板表面に残留する水膜厚が3μm（水分量で3g／m2に相当）以下であることが好ましい。 As a result, moisture remaining on the steel sheet surface can be considered as a cause of discoloration, and the amount of water remaining on the steel sheet surface, which is the cause of discoloration after washing and drying, should be measured periodically and kept below a predetermined value. The knowledge that it was effective in prevention was obtained. The predetermined value is a water film thickness of 5 μm or less (5 g / m 2 or less in water content). From the results of FIG. 3, the water film thickness remaining on the steel sheet surface is 3 μm (water content is 3 g / m 2) . It is preferable that
図４は、本発明の外観性に優れた溶融亜鉛めっき鋼板の製造方法の一実施形態を示す。図４において、１は液接触装置、２は洗浄・乾燥装置、３は水分検出器、４は乾燥設備である。図４によれば、液接触装置１にて溶融亜鉛めっき鋼板表面に酸性処理液を塗布し、所定時間放置した後、洗浄、乾燥装置２にて洗浄、乾燥を行い、溶融亜鉛めっき鋼板表面に酸化膜を形成する。次いで、水分検出器３にて、溶融亜鉛めっき鋼板表面の水膜厚もしくは水分量を測定する。次いで、水膜厚もしくは水分量の測定結果に基づき、乾燥設備４では、水膜厚もしくは水分量が所定値以下となるように乾燥を行う。なお、水分検出器３は、常時測定可能となっており、板幅方向に走査することで全幅連続測定が可能となる。また、乾燥設備４は、水分検出器３による測定結果を受けて、水膜厚もしくは水分量が所定値以下となるように、乾燥が行えるように、風量および温風温度の調整が可能な設備となっている。このように、洗浄、乾燥後の表面の微量の水分を測定監視することで表面の水分量を所定値以下にすることが可能となる。その結果、鋼板表面に微量な水分が残留し酸化膜の酸化がさらに進行することで表面が変色する問題が解決される。 FIG. 4 shows an embodiment of a method for producing a hot-dip galvanized steel sheet having excellent appearance according to the present invention. In FIG. 4, 1 is a liquid contact device, 2 is a cleaning / drying device, 3 is a moisture detector, and 4 is a drying facility. According to FIG. 4, an acidic treatment liquid is applied to the surface of the hot dip galvanized steel sheet with the liquid contact device 1, left for a predetermined time, and then washed and dried with the cleaning and drying device 2 to An oxide film is formed. Next, the moisture detector 3 measures the water film thickness or moisture content on the surface of the hot dip galvanized steel sheet. Next, based on the measurement result of the water film thickness or water content, the drying equipment 4 performs drying so that the water film thickness or water content is a predetermined value or less. The moisture detector 3 can always measure, and the full width continuous measurement is possible by scanning in the plate width direction. In addition, the drying facility 4 is a facility that can adjust the air volume and the hot air temperature so that the drying can be performed so that the water film thickness or the water content is not more than a predetermined value based on the measurement result by the moisture detector 3. It has become. Thus, by measuring and monitoring a small amount of moisture on the surface after cleaning and drying, the amount of moisture on the surface can be reduced to a predetermined value or less. As a result, the problem that the surface is discolored due to a minute amount of moisture remaining on the surface of the steel sheet and further oxidation of the oxide film proceeds is solved.
なお、水分量の測定は、単位面積当たりの重量であっても、水膜の厚みであってもよい。洗浄、乾燥後塗油までの間に実施すれば良く、特に制限されない。しかしながら、酸化反応時間を極力減らすことを考慮すれば、洗浄、乾燥直後に水分量を測定することが好ましい。 The water content may be measured by the weight per unit area or the thickness of the water film. What is necessary is just to implement between washing | cleaning and oiling after drying, and it does not restrict | limit in particular. However, in consideration of reducing the oxidation reaction time as much as possible, it is preferable to measure the water content immediately after washing and drying.
なお、本発明における溶融亜鉛めっき鋼板とは、合金化処理を行わない溶融亜鉛めっき鋼板、めっき処理後合金化処理を行う合金化亜鉛めっき鋼板のいずれにも適用できる。 In addition, with the hot dip galvanized steel plate in this invention, it can apply to both the hot dip galvanized steel plate which does not perform an alloying process, and the alloyed galvanized steel plate which performs an alloying process after a plating process.
図４に示した装置を用いて、板厚0.6ｍｍ、板幅1200ｍｍの溶融亜鉛めっき鋼板のコイルに対して、酸化膜を形成させる処理を行った。なお、水分検出器３としては、0.1μm単位で測定可能な赤外線吸収法を用いた水膜計を使用した。そして、洗浄、乾燥後に、前記水膜計を鋼板の表裏に１台ずつ設置し幅方向に走査させることで、鋼板表裏の全幅の水膜厚を測定した（図5参照）。測定結果に基づき、水膜厚が5μmを超えると警報がなるようにし、即座に乾燥状態を確認し、水膜厚が5μm以下となるように乾燥処理を行った。洗浄直後（リンガーロールによる絞りの後）の水膜厚は約300μｍあったが、その後、120℃、風量1200Ｎｍ３／ｈｒの乾燥を実施した結果、水膜厚は1〜2μｍ（水分量1〜2ｇ／ｍ２）となった。 Using the apparatus shown in FIG. 4, a treatment for forming an oxide film was performed on a coil of a hot dip galvanized steel sheet having a thickness of 0.6 mm and a width of 1200 mm. In addition, as the water | moisture-content detector 3, the water film meter using the infrared absorption method which can be measured per 0.1 micrometer was used. And after washing | cleaning and drying, the said water film meter was installed one each on the front and back of a steel plate, and the water film thickness of the full width of the steel plate front and back was measured by scanning in the width direction (refer FIG. 5). Based on the measurement results, an alarm was given when the water film thickness exceeded 5 μm, the dry state was immediately confirmed, and the drying process was performed so that the water film thickness was 5 μm or less. The water film thickness immediately after washing (after squeezing with a ringer roll) was about 300 μm, but after drying at 120 ° C. and an air volume of 1200 Nm 3 / hr, the water film thickness was 1 to 2 μm (water content 1 to 1). 2 g / m 2 ).
以上により得られた高潤滑溶融亜鉛めっき鋼板に対して、表面の変色の有無を目視により観察したところ、表面の酸化膜の変色発生は０であった。 When the surface of the highly lubricated galvanized steel sheet obtained as described above was visually observed for discoloration, the occurrence of discoloration of the oxide film on the surface was zero.
１ 液接触装置
２ 洗浄・乾燥装置
３ 水分検出器
４ 乾燥設備
1 Liquid contact device 2 Cleaning / drying device 3 Moisture detector 4 Drying equipment
Claims (1)
前記洗浄、乾燥終了後、前記溶融亜鉛めっき鋼板表面の水膜厚もしくは水分量を測定し、次いで、前記水膜厚が５μｍ以下もしくは水分量が５ｇ／ｍ２以下となるように乾燥を行うことを特徴とする表面酸化膜の変色を防止した溶融亜鉛めっき鋼板の製造方法。 In the method for producing a hot dip galvanized steel sheet, an acidic treatment solution is applied to the surface of the hot dip galvanized steel sheet, left for a predetermined time, and after washing and drying, an oxide film is formed on the surface of the hot dip galvanized steel sheet.
After completion of the washing and drying, the water film thickness or water content on the surface of the hot dip galvanized steel sheet is measured, and then drying is performed so that the water film thickness is 5 μm or less or the water content is 5 g / m 2 or less. A method for producing a hot-dip galvanized steel sheet, which prevents discoloration of the surface oxide film .
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| JP2003231959A (en) * | 2002-02-13 | 2003-08-19 | Jfe Steel Kk | Hot-dip galvannealed steel plate manufacturing facility |
| JP2006255687A (en) * | 2005-02-15 | 2006-09-28 | Jfe Steel Kk | Production method of surface treated object |
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