JPH04218650A - Hot dip metal coating method - Google Patents
Hot dip metal coating methodInfo
- Publication number
- JPH04218650A JPH04218650A JP40328990A JP40328990A JPH04218650A JP H04218650 A JPH04218650 A JP H04218650A JP 40328990 A JP40328990 A JP 40328990A JP 40328990 A JP40328990 A JP 40328990A JP H04218650 A JPH04218650 A JP H04218650A
- Authority
- JP
- Japan
- Prior art keywords
- bath
- inclusions
- molten metal
- filter
- zinc
- 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.)
- Withdrawn
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 25
- 239000002184 metal Substances 0.000 title claims abstract description 25
- 238000000576 coating method Methods 0.000 title abstract 4
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 8
- 238000007747 plating Methods 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 abstract description 16
- 239000011701 zinc Substances 0.000 abstract description 16
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 15
- 239000000919 ceramic Substances 0.000 abstract description 14
- 229910021328 Fe2Al5 Inorganic materials 0.000 abstract description 8
- 238000005246 galvanizing Methods 0.000 abstract description 4
- 229910001335 Galvanized steel Inorganic materials 0.000 abstract description 2
- 239000008397 galvanized steel Substances 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、溶融金属めっき浴中の
ドロス除去方法を改善した溶融金属めっき方法に関する
。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molten metal plating that improves the method for removing dross from a molten metal plating bath.
【０００２】0002
【従来の技術】例えば、鋼帯（以下、ストリップという
）の亜鉛めっきの場合に、亜鉛めっき浴中ではストリッ
プや浴中機器から溶出したＦｅが固溶限界以上になると
浴中に析出し、浴中に含まれるＡｌ等と反応して固体介
在物（一般にドロスと称する）を生成する。[Prior Art] For example, when galvanizing a steel strip (hereinafter referred to as a strip), Fe eluted from the strip or equipment in the bath in a galvanizing bath will precipitate in the bath if it exceeds the solid solubility limit. It reacts with Al and the like contained therein to produce solid inclusions (generally referred to as dross).
【０００３】この介在物は浴中のＡｌ濃度等により、Ｆ
ｅＺｎ７ として浴の底部に堆積したり、Ｆｅ２Ａｌ５
として浴面に浮上するが、Ｆｅ２Ａｌ５はその過程にお
いて浴中に浮遊しているものが多くあり、これがストリ
ップに付着してその表面品質を低下させている。[0003] These inclusions are caused by F depending on the Al concentration in the bath.
Deposited at the bottom of the bath as eZn7 or as Fe2Al5
However, during this process, much of Fe2Al5 floats in the bath, and this adheres to the strip, degrading its surface quality.
【０００４】0004
【発明が解決しようとする課題】この介在物の除去方法
としてセラミックフィルターを利用して濾過する方法（
特開昭６２−２０２０７０号）があるが、これは溶融亜
鉛を連続的に処理する方法なので亜鉛ポンプ等の設備が
必要であり、このポンプが連続使用に耐えられずに故障
しやすいという問題があった。[Problem to be solved by the invention] As a method for removing these inclusions, a method of filtration using a ceramic filter (
JP-A No. 62-202070), but since this method processes molten zinc continuously, equipment such as a zinc pump is required, and the problem is that this pump cannot withstand continuous use and is prone to breakdown. there were.
【０００５】また、この方法ではＦｅ２Ａｌ５は濾過で
きても底部に堆積したＦｅＺｎ７ に対しては効果がな
く、ある程度堆積すると人力により汲み出すことが必要
であった。Furthermore, although Fe2Al5 can be filtered with this method, it is ineffective against FeZn7 deposited at the bottom, and once the deposit has accumulated to a certain extent, it is necessary to manually pump it out.
【０００６】本発明は、溶融金属の循環装置を用いるこ
となくめっき浴に浮遊する固体介在物の除去が可能であ
るとともに、同時に浴底部に堆積する固体介在物も除去
できる溶融金属めっき方法を提供することを目的として
いる。The present invention provides a molten metal plating method that can remove solid inclusions floating in a plating bath without using a molten metal circulation device, and can also remove solid inclusions deposited at the bottom of the bath at the same time. It is intended to.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に本発明によれば、鋼帯を溶融金属めっき浴槽中の溶融
金属浴でめっきする溶融金属めっき方法において、前記
浴槽の底部に多孔性フィルターを設け、この多孔性フィ
ルターを前記浴槽の底部から前記溶融金属浴上に所定の
時間間隔で引きあげることにより溶融金属浴中の固体介
在物を除去することを特徴とする溶融金属めっき方法が
提供される。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a hot-dip metal plating method in which a steel strip is plated in a molten metal bath in a hot-dip metal plating bath, in which a porous layer is formed at the bottom of the bath. A method of molten metal plating, characterized in that a filter is provided, and solid inclusions in the molten metal bath are removed by pulling the porous filter from the bottom of the bathtub onto the molten metal bath at predetermined time intervals. provided.
【０００８】以下に本発明をさらに詳細に説明する。な
お、以下の説明では亜鉛めっきを代表例として説明する
が、これに限るものではない。The present invention will be explained in more detail below. In addition, although zinc plating is demonstrated as a representative example in the following description, it is not limited to this.
【０００９】図１は、本発明方法を実施する装置の一例
を示す構成図で、ストリップ１はシンクロール４により
亜鉛浴槽２の中の亜鉛浴３を通過して、亜鉛めっきされ
る。FIG. 1 is a block diagram showing an example of an apparatus for carrying out the method of the present invention, in which a strip 1 is passed through a zinc bath 3 in a zinc bath 2 by a sink roll 4 to be galvanized.
【００１０】この亜鉛浴の中には通常ドロスと呼ばれる
介在物（ＦｅＺｎ７、Ｆｅ２Ａｌ５）が介在しており、
ＦｅＺｎ７ は浴槽底部に堆積し、Ｆｅ２Ａｌ５は浴中
に浮遊している。[0010] In this zinc bath, there are usually inclusions called dross (FeZn7, Fe2Al5),
FeZn7 is deposited at the bottom of the bath, and Fe2Al5 is floating in the bath.
【００１１】このＦｅ２Ａｌ５はストリップ表面に付着
して製品の表面品質を劣化させる。また、ＦｅＺｎ７
もその堆積量が多量になってくると、シンクロールの回
転による撹拌のために浴中に浮遊しストリップに付着し
易い状態になる。[0011] This Fe2Al5 adheres to the surface of the strip and deteriorates the surface quality of the product. In addition, FeZn7
When the amount of deposits becomes large, it floats in the bath due to agitation caused by the rotation of the sink roll and tends to adhere to the strip.
【００１２】したがって、亜鉛浴中に存在する介在物を
除去して亜鉛浴を清浄にすることが重要で、本発明では
浴槽底部に沈めた多孔性フィルター６を所定の時間間隔
、すなわち定期的または不定期的に浴面上まで引きあげ
ることによりめっき液中から介在物を除去するものであ
る。[0012] Therefore, it is important to clean the zinc bath by removing the inclusions present in the zinc bath, and in the present invention, the porous filter 6 submerged in the bottom of the bath is cleaned at predetermined time intervals, that is, periodically or Inclusions are removed from the plating solution by irregularly raising it above the bath surface.
【００１３】多孔性フィルターとしては、めっき金属よ
りも融点の高い金属、非金属製のもので、例えばセラミ
ックフィルターを用いることができる。この場合に多孔
性フィルターと浴槽２の壁との間のすき間が大きいと介
在物の除去効果が小さくなるのでできるだけすき間を小
さくすることが必要である。浴槽２の横断面の形状と同
一にするのが望ましい。[0013] The porous filter may be made of a metal or non-metal having a melting point higher than that of the plated metal, such as a ceramic filter. In this case, if the gap between the porous filter and the wall of the bathtub 2 is large, the effect of removing inclusions will be reduced, so it is necessary to make the gap as small as possible. It is desirable that the shape be the same as the cross-sectional shape of the bathtub 2.
【００１４】また、多孔性フィルターの引き上げ速度も
速すぎるとめっき液が浴槽２からあふれてしまう危険性
がある。Furthermore, if the porous filter is pulled up too quickly, there is a risk that the plating solution will overflow from the bathtub 2.
【００１５】気孔率６０％、気孔径０．８ｍｍ、厚さ３
０ｍｍの板状セラミックフィルターを用い、図１の装置
により後述する実施例での条件でセラミックフィルター
と浴槽の面積比、フィルターの引き上げ速度の最適値の
検討を行った結果を表１、表２に示す。上記条件下では
、セラミックフィルター面積率（セラミックフィルター
面積÷浴槽の底面積×１００で示す）は９６％以上で介
在物除去効果があり、セラミックフィルター引き上げ速
度は５０ｍｍ／ｍｉｎ以下においてめっき液が浴槽から
あふれないことがわかる。[0015] Porosity: 60%, pore diameter: 0.8 mm, thickness: 3
Tables 1 and 2 show the results of examining the optimal values for the area ratio of the ceramic filter and the bathtub and the filter lifting speed using a 0 mm plate-shaped ceramic filter and using the apparatus shown in Figure 1 under the conditions of the example described later. show. Under the above conditions, the ceramic filter area ratio (ceramic filter area ÷ bottom area of the bathtub x 100) is 96% or more, which is effective for removing inclusions, and the ceramic filter pulling speed is 50 mm/min or less, so that the plating solution is removed from the bathtub. You can see that it won't overflow.
【００１６】フィルターを引き上げる方法としては、適
宜の手段を採用できる。例えば、操業停止時に、シンク
ロール４や付着量調整装置５を取外し、スナウト７の着
脱可としてある先端部（図示せず）を外し、予めフィル
ターに付設してあるワイヤー（図示せず）をクレーン類
で上昇、退避させ、フィルター再生中に新しいフィルタ
ーを浴槽に収容するようにすればよい。[0016] Any suitable means can be used to pull up the filter. For example, when the operation is stopped, the sink roll 4 and the adhesion amount adjusting device 5 are removed, the removable tip (not shown) of the snout 7 is removed, and the wire (not shown) that has been attached to the filter in advance is removed using a crane. The new filter can be placed in the bathtub while the filter is being regenerated.
【００１７】[0017]
【００１８】[0018]
【００１９】[0019]
【作用】溶融金属めっき浴、例えば亜鉛めっき浴中に存
在している介在物は、Ｆｅ２Ａｌ５やＦｅＺｎ７ のよ
うな金属間化合物として存在し、その大きさは数μｍ〜
数１００μｍとさまざまである。[Function] Inclusions present in hot-dip metal plating baths, such as galvanizing baths, exist as intermetallic compounds such as Fe2Al5 and FeZn7, and their sizes range from several μm to
The thickness varies from several 100 μm.
【００２０】本発明は、めっき浴中にセラミックフィル
ターを沈めておき、所定の時間間隔でそれを浴上まで引
きあげることにより、上記の介在物を同時に濾過してし
まうものである。In the present invention, the above-mentioned inclusions are simultaneously filtered by submerging a ceramic filter in a plating bath and pulling it up above the bath at predetermined time intervals.
【００２１】本発明により、溶融亜鉛の循環装置を用い
ることなく、ストリップに付着してその表面品質を劣化
させる介在物を容易に除去できるとともに、従来は人力
で汲み出していたＦｅＺｎ７ 系の介在物の底部への堆
積を防止できる。According to the present invention, inclusions that adhere to the strip and deteriorate its surface quality can be easily removed without using a molten zinc circulation device, and FeZn7-based inclusions that were conventionally pumped out manually can be removed. It can prevent accumulation on the bottom.
【００２２】[0022]
【実施例】以下に本発明を実施例に基づき具体的に説明
する。EXAMPLES The present invention will be specifically explained below based on examples.
【００２３】（実施例−１）図１の装置においてセラミ
ックフィルター６（気孔率６０％、気孔径０．８ｍｍ、
厚さ３０ｍｍ、板状）を浴槽２の横断面の形状にあわせ
て（２９３０ｍｍ×３９３０ｍｍ）を亜鉛浴槽２内に沈
めた。(Example 1) In the apparatus shown in FIG. 1, a ceramic filter 6 (porosity 60%, pore diameter 0.8 mm,
A plate (30 mm thick, plate-like) was submerged in the zinc bath 2 according to the shape of the cross section of the bath (2930 mm x 3930 mm).
【００２４】ストリップ（０．８ｍｍ×１２５０ｍｍ）
を下記条件で通板し溶融亜鉛めっきを行った。
浴槽サイズ：横断面３０００ｍｍ×４０００ｍｍストリ
ップサイズ：０．８ｍｍ×１２５０ｍｍライン速度：１
００ｍｐｍ
亜鉛付着量：６０ｇ／ｍ２ （片面につき）セラミック
フィルター面積率：９６％
セラミックフィルター引き上げ速度：５０ｍｍ／ｍｉｎ
引き上げ頻度：１回／４日[0024] Strip (0.8mm x 1250mm)
was passed through and hot-dip galvanized under the following conditions. Bathtub size: Cross section 3000mm x 4000mm Strip size: 0.8mm x 1250mm Line speed: 1
00mpm Zinc deposition amount: 60g/m2 (per side) Ceramic filter area ratio: 96% Ceramic filter pulling speed: 50mm/min
Raising frequency: 1 time/4 days
【００２５】比較例として、本発明による介在物除去を
行なわなかった他は上記実施例１と同様にしてめっきを
行った。As a comparative example, plating was carried out in the same manner as in Example 1 above, except that the removal of inclusions according to the present invention was not performed.
【００２６】結果を図２に示す。図中実施例１は、セラ
ミックフィルターの引き上げ間におけるストリップ１０
０ｃｍ２ 当りの介在物の粒径別個数の平均データであ
る。引上げたフィルターは介在物の除去が必要であり、
次に沈められるフィルターは処理後のものとなる。また
、図２の比較例は実施例と同じ時間間隔でストリップ１
００ｃｍ２ 当りの介在物を測定したものである。The results are shown in FIG. Embodiment 1 in the figure shows a strip 10 during pulling up of a ceramic filter.
This is the average data of the number of inclusions per 0 cm2 according to particle size. It is necessary to remove inclusions from the pulled filter.
The next filter to be submerged will be the one after treatment. In addition, in the comparative example of FIG. 2, the strip 1 is
The number of inclusions per 00 cm2 was measured.
【００２７】図２に示すように、実施例１ではストリッ
プ表面への介在物付着をほぼ皆無にすることができた。As shown in FIG. 2, in Example 1, the adhesion of inclusions to the strip surface was almost completely eliminated.
【００２８】また、本発明の実施により、人力によるＦ
ｅＺｎ７ 系介在物の汲み出し作業も不要となった。[0028] Furthermore, by carrying out the present invention, F
There is also no need to pump out eZn7-based inclusions.
【００２９】[0029]
【発明の効果】本発明は以上説明したように構成されて
いるので、本発明によれば溶融金属めっき浴から浮遊介
在物を除去できるとともに、これまで人力に頼ってきた
浴底部に堆積する介在物の汲み出し作業が不要となった
。Effects of the Invention Since the present invention is constructed as described above, it is possible to remove floating inclusions from a hot-dip metal plating bath, and to remove the inclusions that have accumulated at the bottom of the bath, which have hitherto relied on manual labor. There is no longer a need to pump things out.
【００３０】これにより表面品質に優れた溶融亜鉛めっ
き鋼板等の溶融金属鋼板が製造できるとともに製造時の
歩留りを向上することができる。[0030] As a result, it is possible to produce a molten metal steel plate such as a hot-dip galvanized steel plate with excellent surface quality, and to improve the yield during production.
【図１】本発明方法を実施する装置の一例を示す側面断
面図である。FIG. 1 is a side sectional view showing an example of an apparatus for carrying out the method of the present invention.
【図２】めっき後のストリップ１００ｃｍ２ 当りの介
在物の粒径別個数を示すグラフである。FIG. 2 is a graph showing the number of inclusions according to particle size per 100 cm 2 of strip after plating.
１ ストリップ
２ 亜鉛浴槽
３ 亜鉛浴
４ シンクロール
５ 付着量調整装置
６ 多孔性フィルター（セラミックフィルター）７
スナウト1 Strip 2 Zinc bath 3 Zinc bath 4 Sink roll 5 Adhesion amount adjusting device 6 Porous filter (ceramic filter) 7
snout
Claims (1)
属浴でめっきする溶融金属めっき方法において、前記浴
槽の底部に多孔性フィルターを設け、この多孔性フィル
ターを前記浴槽の底部から前記溶融金属浴上に所定の時
間間隔で引きあげることにより溶融金属浴中の固体介在
物を除去することを特徴とする溶融金属めっき方法。1. A molten metal plating method in which a steel strip is plated in a molten metal bath in a molten metal plating bath, wherein a porous filter is provided at the bottom of the bath, and the porous filter is used to remove the molten metal from the bottom of the bath. A molten metal plating method characterized in that solid inclusions in a molten metal bath are removed by pulling the molten metal onto the bath at predetermined time intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40328990A JPH04218650A (en) | 1990-12-18 | 1990-12-18 | Hot dip metal coating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40328990A JPH04218650A (en) | 1990-12-18 | 1990-12-18 | Hot dip metal coating method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04218650A true JPH04218650A (en) | 1992-08-10 |
Family
ID=18513037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP40328990A Withdrawn JPH04218650A (en) | 1990-12-18 | 1990-12-18 | Hot dip metal coating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04218650A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11008439B2 (en) | 2015-10-02 | 2021-05-18 | The Chemours Company Fc, Llc | Solid polymeric articles having hydrophobic compounds intermixed therein |
| US11274220B2 (en) | 2015-10-02 | 2022-03-15 | The Chemours Company Fc, Llc | Hydrophobic extenders in non-fluorinated surface effect coatings |
-
1990
- 1990-12-18 JP JP40328990A patent/JPH04218650A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11008439B2 (en) | 2015-10-02 | 2021-05-18 | The Chemours Company Fc, Llc | Solid polymeric articles having hydrophobic compounds intermixed therein |
| US11274220B2 (en) | 2015-10-02 | 2022-03-15 | The Chemours Company Fc, Llc | Hydrophobic extenders in non-fluorinated surface effect coatings |
| US11359099B2 (en) | 2015-10-02 | 2022-06-14 | The Chemours Company Fc, Llc | Hydrophobic extenders in fluorinated surface effect coatings |
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