JPH05339690A - Method for adjusting aluminum content in galvanizing bath and device therefor - Google Patents

Method for adjusting aluminum content in galvanizing bath and device therefor

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Publication number
JPH05339690A
JPH05339690A JP17389092A JP17389092A JPH05339690A JP H05339690 A JPH05339690 A JP H05339690A JP 17389092 A JP17389092 A JP 17389092A JP 17389092 A JP17389092 A JP 17389092A JP H05339690 A JPH05339690 A JP H05339690A
Authority
JP
Japan
Prior art keywords
dip galvanizing
galvanizing bath
hot
aluminum content
bath
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Withdrawn
Application number
JP17389092A
Other languages
Japanese (ja)
Inventor
Masabumi Shimizu
水 正 文 清
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP17389092A priority Critical patent/JPH05339690A/en
Publication of JPH05339690A publication Critical patent/JPH05339690A/en
Withdrawn legal-status Critical Current

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Abstract

PURPOSE:To adjust the aluminum content of a galvanizing bath without degrading productivity by passing a plating bath through heated metallic chips and ceramic filter in this order. CONSTITUTION:The galvanizing bath is passed through the heated metallic chips and ceramic filter in this order in a place where the adjustment is executed in the case of adjustment of the aluminum content in the galvanizing bath of a continuous galvanizing line. A container which has a galvanizing bath introducing port and a discharge port for the galvanizing bath after the adjustment and is disposed with a heating source on the outer side is provided with the metallic chip layer in the upper part and the ceramic filter layer in the lower part. As a result, the rapid transfer from the pure galvanizing stage to an alloying galvannealing stage is enabled and the aluminum content is adjusted without degrading the productivity.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は溶融亜鉛めっき浴のアル
ミニウム含有量調整方法および装置に関し、さらに詳し
くは、連続溶融亜鉛めっきラインにおいては、純亜鉛め
っきと加熱後合金化する合金化溶融亜鉛めっきが行われ
ており、この両方法における溶融亜鉛めっき浴のアルミ
ニウム含有量を短時間に調整することができる溶融亜鉛
めっき浴アルミニウム含有量調整方法および調整装置に
関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for adjusting the aluminum content of a hot-dip galvanizing bath, and more specifically, in a continuous hot-dip galvanizing line, pure hot-dip galvanizing and alloying hot-dip galvanizing for alloying after heating. The present invention relates to a hot dip galvanizing bath aluminum content adjusting method and adjusting device capable of adjusting the aluminum content of the hot dip galvanizing bath in both of these methods in a short time.

【0002】[0002]

【従来技術】一般的に、連続溶融亜鉛めっきラインにお
いては、純亜鉛めっき工程およびめっき後に加熱して合
金化を行う合金化溶融亜鉛めっき工程が行われている。
しかして、この2種類の溶融めっきを行うために、純亜
鉛めっき工程においては基板とめっきとの境界面に、Z
n−Fe−Al系三元合金が形成される。そして、めっ
き層の密着性を良好にするために、溶融めっき浴に有効
Alとして0.13〜0.30wt%のAlを含有させる
必要がある。
2. Description of the Related Art Generally, in a continuous hot-dip galvanizing line, a pure galvanizing step and an alloying hot-dip galvanizing step of heating and alloying after plating are performed.
Therefore, in order to perform these two types of hot dip plating, in the pure zinc plating step, the interface between the substrate and the plating is
An n-Fe-Al-based ternary alloy is formed. Then, in order to improve the adhesiveness of the plating layer, it is necessary to contain 0.13 to 0.30 wt% of Al as effective Al in the hot dipping bath.

【0003】また、めっき後加熱して合金化溶融亜鉛め
っき工程を行う場合には、加熱することにより基板のF
eをZnめっき層に拡散させる必要があるので、溶融亜
鉛めっき浴のAl含有量は0.12wt%以下にしなけ
ればならないのである。
When the alloying hot-dip galvanizing step is performed by heating after plating, the F of the substrate is heated by heating.
Since it is necessary to diffuse e into the Zn plating layer, the Al content of the hot dip galvanizing bath must be 0.12 wt% or less.

【0004】従って、連続溶融亜鉛めっきラインにおけ
る2種類のめっき工程を行う場合には、溶融亜鉛めっき
浴のAl含有量の調整を行う必要がある。このような溶
融亜鉛めっき浴のAl含有量の調整方法としては、2ポ
ット切替方式、浴汲替方式、或いは、軽加工用材を溶融
亜鉛めっき浴に通板して、純Znをこの浴に投入するこ
とにより徐々にAl含有量を下げるという方式がある。
Therefore, when performing two types of plating steps in a continuous hot-dip galvanizing line, it is necessary to adjust the Al content of the hot-dip galvanizing bath. As a method for adjusting the Al content of such a hot dip galvanizing bath, a 2-pot switching system, a bath pumping system, or a light processing material is passed through the hot dip galvanizing bath, and pure Zn is added to this bath. By doing so, there is a system in which the Al content is gradually reduced.

【0005】しかしながら、2ポット切替方式、浴汲替
方式を行う場合には、連続溶融亜鉛めっきラインの操業
を停止しなければならず、生産性が著しく低下し、ま
た、ポットを2個必要とするため、余分な設備を必要と
なり、かつ、設備投資が大きくなるという問題がある。
However, when the two-pot switching system and the bath pumping system are used, the operation of the continuous hot dip galvanizing line must be stopped, the productivity is remarkably reduced, and two pots are required. Therefore, there is a problem that extra equipment is required and the equipment investment becomes large.

【0006】また、軽加工用材を通板して純Znを投入
する方式においては、スケジュールフリーを行うことが
できず、合金化処理を行う工程が限定的になり、さら
に、長時間の操業となるため使用する軽加工用材を確保
することが困難となるという問題がある。
[0006] Further, in the system in which pure Zn is introduced by passing the light processing material through, it is not possible to perform schedule-free, the steps for alloying treatment are limited, and further long-term operation is not possible. Therefore, there is a problem that it is difficult to secure a light processing material to be used.

【0007】[0007]

【発明が解決しようとする課題】本発明は上記に説明し
た連続溶融亜鉛めっきラインにおけるめっきの施行に際
しての従来技術の種々の問題点に鑑み、本発明者が鋭意
研究を行い、検討を重ねた結果、連続亜鉛めっきライン
において行われる純亜鉛めっき工程および合金化めっき
工程におけるめっき浴のAl含有量の調整を、余計な設
備を必要とすることなく、かつ、生産性を低下すること
なく、さらに、短時間に行うことができるという溶融亜
鉛めっき浴のアルミニウム含有量調整方法および装置を
開発したのである。
DISCLOSURE OF THE INVENTION In view of various problems of the prior art in carrying out plating in the continuous hot-dip galvanizing line described above, the present invention has been earnestly studied and studied by the present inventor. As a result, the adjustment of the Al content of the plating bath in the pure zinc plating step and the alloying plating step performed in the continuous galvanizing line does not require extra equipment and does not decrease the productivity, and The inventors have developed a method and an apparatus for adjusting the aluminum content of a hot-dip galvanizing bath that can be performed in a short time.

【0008】[0008]

【課題を解決するための手段】本発明に係る溶融亜鉛め
っき浴のアルミニウム含有量調整方法および装置は、連
続溶融亜鉛めっきラインの、溶融亜鉛めっき浴のアルミ
ニウム含有量の調整を行う場所において、溶融亜鉛めっ
き浴を加熱されている金属チップおよびセラミックフィ
ルターの順に通過させることを特徴とする溶融亜鉛めっ
き浴のアルミニウム含有量調整方法を第1の発明とし、
連続溶融亜鉛めっきラインの、溶融亜鉛めっき浴のアル
ミニウム含有量の調整を行う場所に、溶融亜鉛めっき浴
導入口および調整後溶融亜鉛めっき浴排出口を有する外
側に加熱源が配置されている容器内に、上部に金属チッ
プ層、下部にセラミックフィルター層を設けたことを特
徴とする溶融亜鉛めっき浴のアルミニウム含有量調整装
置を第2の発明とする2つの発明よりなるものである。
The method and apparatus for adjusting the aluminum content of a hot-dip galvanizing bath according to the present invention is a method for adjusting the aluminum content of a hot-dip galvanizing bath in a continuous hot-dip galvanizing line. A first invention is a method for adjusting an aluminum content of a hot dip galvanizing bath, which comprises passing a galvanizing bath through a heated metal chip and a ceramic filter in this order,
Inside the vessel where the heating source is located outside the hot dip galvanizing bath at the location where the aluminum content of the hot dip galvanizing bath is adjusted in the continuous hot dip galvanizing line. The invention further comprises a second invention, which is an apparatus for adjusting the aluminum content of a hot dip galvanizing bath, characterized in that a metal chip layer is provided on the upper part and a ceramic filter layer is provided on the lower part.

【0009】本発明に係る溶融亜鉛めっき浴のアルミニ
ウム含有量調整方法および装置について、以下詳細に説
明する。先ず、本発明に係る溶融亜鉛めっき浴のアルミ
ニウム含有量調整方法について説明する。
The method and apparatus for adjusting the aluminum content of the hot dip galvanizing bath according to the present invention will be described in detail below. First, the method for adjusting the aluminum content of the hot-dip galvanizing bath according to the present invention will be described.

【0010】本発明に係る溶融亜鉛めっき浴のアルミニ
ウム含有量調整方法においては、連続溶融亜鉛めっきラ
インの適宜の場所、例えば、亜鉛めっきポットに仕切り
を設け、パイプにより連結し、(この場合、一つのポッ
ト内でもよい。)、このパイプの途中に、設けられてい
る加熱された鉄等の金属チップ層およびこれも加熱され
ているセラミックフィルターを順次に、溶融亜鉛めっき
浴を通過させることにより、上記純亜鉛めっき浴のAl
含有量を低下させる調整を行うのである。
In the method for adjusting the aluminum content of the hot-dip galvanizing bath according to the present invention, a partition is provided at an appropriate place of the continuous hot-dip galvanizing line, for example, a galvanizing pot, and is connected by a pipe. It may be in one pot.), And in the middle of this pipe, a layer of heated metal chips such as iron and a ceramic filter that is also heated are sequentially passed through a hot dip galvanizing bath, Al of the above pure zinc plating bath
Adjustments are made to reduce the content.

【0011】この場合、加熱されている金属チップ層お
よびセラミックフィルターの雰囲気は不活性ガス、例え
ば、窒素ガス等により溶融亜鉛めっき浴の酸化を防止す
るようにしておくのが効果的である。また、金属チップ
としては、溶融亜鉛めっき浴中のAlとFe2Al5を生
成するFeチップを使用するのがよい。
In this case, it is effective to prevent the oxidation of the hot dip galvanizing bath by an inert gas such as nitrogen gas in the atmosphere of the heated metal chip layer and the ceramic filter. Further, as the metal tip, it is preferable to use an Fe tip that produces Al and Fe 2 Al 5 in the hot dip galvanizing bath.

【0012】次に、このように生成したFe2Al5をセ
ラミックフィルターにより捕集し、除去するのであり、
従って、溶融亜鉛めっき浴を金属チップ層およびセラミ
ックフィルターを通過させることにより、Al含有量が
低く、かつ、Fe2Al5が除去された溶融亜鉛めっき浴
とすることができる。
Next, the Fe 2 Al 5 thus produced is collected by a ceramic filter and removed.
Therefore, by passing the hot dip galvanizing bath through the metal chip layer and the ceramic filter, it is possible to obtain a hot dip galvanizing bath in which the Al content is low and Fe 2 Al 5 is removed.

【0013】次に、本発明に係る溶融亜鉛めっき浴のア
ルミニウム含有量調整装置について説明する。即ち、図
1に示す本発明に係る溶融亜鉛めっき浴のアルミニウム
含有量調整装置の1例により説明する。
Next, the apparatus for adjusting the aluminum content of the hot dip galvanizing bath according to the present invention will be described. That is, an example of the apparatus for adjusting the aluminum content of the hot-dip galvanizing bath according to the present invention shown in FIG. 1 will be described.

【0014】図1において、連続溶融亜鉛めっきライン
における溶融亜鉛ポット1と1′に仕切り(下部は連絡
している。)により分割されており、ポット1、1′に
おける純亜鉛めっき工程ではフリー Alで0.13〜
0.20wt%のAlが含有されており、電磁ポンプ2
により溶融亜鉛めっき浴Mを円筒形のAl調整装置3に
溶融亜鉛めっき浴供給口8から供給する。そして、パイ
プPによりポット1およびポット1′を連結し、その途
中に電磁ポンプおよび調整装置が設けられている(この
場合、ポットは一つでもよい。)。
In FIG. 1, hot-dip galvanizing lines 1 and 1'in a continuous hot-dip galvanizing line are divided by a partition (the lower part is connected), and free Al is used in the pure galvanizing process in the pots 1 and 1 '. At 0.13 ~
Electromagnetic pump 2 containing 0.20 wt% Al
Thus, the hot dip galvanizing bath M is supplied to the cylindrical Al adjusting device 3 from the hot dip galvanizing bath supply port 8. Then, the pot 1 and the pot 1'are connected by a pipe P, and an electromagnetic pump and an adjusting device are provided in the middle thereof (in this case, there may be one pot).

【0015】この円筒形のAl調整装置3は溶融亜鉛め
っき浴Mの酸化を防止するために不活性雰囲気、例え
ば、窒素等のガスを導入口7から導入して不活性雰囲気
としておき、そして、その周囲を加熱源として、例え
ば、加熱ヒーター6により加熱するものであり、かつ、
内部には上部に金属チップとしてFeチップ層5が配置
されており、その下部にセラミックフィルター4が配置
されている。このセラミックフィルター4はAl23
直系1.5mmの糸状に焼成したものを輪状に成形して
積層した構造である。
In order to prevent the galvanizing bath M from being oxidized, the cylindrical Al adjusting device 3 introduces an inert atmosphere, for example, a gas such as nitrogen from the inlet 7 to make it an inert atmosphere, and The surroundings are used as a heating source, for example, are heated by the heater 6, and
Inside, an Fe chip layer 5 as a metal chip is arranged in the upper part, and a ceramic filter 4 is arranged in the lower part. The ceramic filter 4 has a structure in which Al 2 O 3 is directly fired into a filament shape of 1.5 mm and formed into a ring shape and laminated.

【0016】このような構造の溶融亜鉛めっき浴のアル
ミニウム含有量調整装置において、Alを含有している
溶融亜鉛めっき浴Mを電磁ポンプ2により汲み出し、パ
イプPを通って空気と接触することなく不活性雰囲気の
Al調整装置3に溶融亜鉛めっき浴供給口8より供給す
る。
In the apparatus for adjusting the aluminum content of the hot-dip galvanizing bath having such a structure, the hot-dip galvanizing bath M containing Al is pumped out by the electromagnetic pump 2 and passed through the pipe P without contact with air. It is supplied from the hot dip galvanizing bath supply port 8 to the Al adjusting device 3 in the active atmosphere.

【0017】このAl調整装置3に供給された溶融亜鉛
めっき浴Mは、最初にFeチップ層5を通過して落下す
る。このAl調整装置3は加熱源6により400℃以上
の温度に保持されており、また、溶融亜鉛めっき浴の温
度も450℃以上であるから、Feチップ層5からFe
が溶融亜鉛めっき浴に溶出する。
The hot dip galvanizing bath M supplied to the Al adjusting device 3 first passes through the Fe chip layer 5 and falls. The Al adjusting device 3 is maintained at a temperature of 400 ° C. or higher by the heating source 6, and the temperature of the hot dip galvanizing bath is also 450 ° C. or higher.
Elutes in the hot dip galvanizing bath.

【0018】溶出したFeは溶融亜鉛めっき浴中のフリ
ーAlと反応して、Fe2Al5の化合物を生成する。従
って、溶融亜鉛めっき浴中のAlは除去されて、Al含
有量が調整される。しかし、溶融亜鉛めっき浴の品質上
有害であるFe2Al5(ドロス欠陥)が生成しているの
で、これを除去する必要がある。
The eluted Fe reacts with free Al in the hot dip galvanizing bath to form a compound of Fe 2 Al 5 . Therefore, Al in the hot dip galvanizing bath is removed and the Al content is adjusted. However, since Fe 2 Al 5 (dross defect), which is harmful to the quality of the hot dip galvanizing bath, is generated, it needs to be removed.

【0019】このFe2Al5を除去するために、Feチ
ップ層5の下部にセラミックフィルター4を配置して、
このFe2Al5を含有している溶融亜鉛めっき浴がセラ
ミックフィルター4を通過する間にFe2Al5がセラミ
ックフィルター4に付着して除去され、Al調整装置3
の下部に落下してきた溶融亜鉛めっき浴M′は、Al含
有量が調整されており、さらに、Fe2Al5の含有して
いない品質の良好なめっき浴となって溶融亜鉛めっき浴
排出口9から溶融亜鉛めっきポット1′に回収される。
In order to remove this Fe 2 Al 5 , a ceramic filter 4 is arranged below the Fe chip layer 5 and
While the hot dip galvanizing bath containing this Fe 2 Al 5 passes through the ceramic filter 4, Fe 2 Al 5 adheres to and is removed from the ceramic filter 4, and the Al adjusting device 3
In the hot dip galvanizing bath M ′ that has fallen to the bottom of the hot dip galvanizing bath M ′, the Al content has been adjusted, and further, a good-quality hot dip galvanizing bath containing no Fe 2 Al 5 has been formed. From the hot dip galvanizing pot 1 '.

【0020】このようにして、所定の時間このAl調整
装置に溶融亜鉛めっき浴を通過させることにより、溶融
亜鉛めっき浴のフリーAlの含有量が調整されて合金化
溶融亜鉛めっきが可能なめっき浴とすることができる。
In this way, by passing the hot dip galvanizing bath through this Al adjusting device for a predetermined time, the content of free Al in the hot dip galvanizing bath is adjusted and alloying hot dip galvanizing is possible. Can be

【0021】[0021]

【発明の効果】以上説明したように、本発明に係る溶融
亜鉛めっき浴のアルミニウム含有量調整方法および装置
は上記の構成であるから、短時間において純溶融亜鉛め
っき工程から合金化溶融亜鉛めっき工程に移行すること
が可能となり、合金化処理工程のスケジュールフリーが
可能となり、さらに、設備も大きくなることがないとい
う効果を有するものである。
As described above, since the method and apparatus for adjusting the aluminum content of the hot dip galvanizing bath according to the present invention have the above-mentioned constitution, the process from the pure hot dip galvanizing process to the alloy hot dip galvanizing process can be performed in a short time. It becomes possible to shift to No. 3, and the schedule of the alloying process step can be made free, and further, there is an effect that the equipment does not become large.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に係る溶融亜鉛めっき浴のアルミニウム
含有量調整方法を実施するための装置の例を示す図であ
る。
FIG. 1 is a diagram showing an example of an apparatus for carrying out a method for adjusting an aluminum content of a hot-dip galvanizing bath according to the present invention.

【符号の説明】[Explanation of symbols]

1・・・溶融亜鉛めっき浴ポット 1′・・合金化溶融亜鉛めっき浴ポット 2・・・電磁ポンプ 3・・・Al調整装置 4・・・セラミックフィルター 5・・・金属チップ層(Fe) 6・・・加熱源(加熱ヒーター) 7・・・不活性ガス(窒素ガス) 8・・・溶融亜鉛めっき浴供給口 9・・・溶融亜鉛めっき浴排出口 P・・・パイプ M・・・溶融亜鉛めっき浴 M′・・調整後溶融亜鉛めっき浴 1 ... Hot-dip galvanizing bath pot 1 '... Alloyed hot-dip galvanizing bath pot 2 ... Electromagnetic pump 3 ... Al adjusting device 4 ... Ceramic filter 5 ... Metal chip layer (Fe) 6 ... Heating source (heating heater) 7 ... Inert gas (nitrogen gas) 8 ... Hot dip galvanizing bath supply port 9 ... Hot dip galvanizing bath discharge port P ... Pipe M ... Melting Galvanizing bath M '... Hot dip galvanizing bath after adjustment

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 連続溶融亜鉛めっきラインの、溶融亜鉛
めっき浴のアルミニウム含有量の調整を行う場所におい
て、溶融亜鉛めっき浴を加熱されている金属チップおよ
びセラミックフィルターの順に通過させることを特徴と
する溶融亜鉛めっき浴のアルミニウム含有量調整方法。
1. A hot dip galvanizing bath is passed through a heated metal chip and a ceramic filter in this order at a place where the aluminum content of the hot dip galvanizing bath is adjusted in a continuous hot dip galvanizing line. Method for adjusting aluminum content in hot dip galvanizing bath.
【請求項2】 連続溶融亜鉛めっきラインの、溶融亜鉛
めっき浴のアルミニウム含有量の調整を行う場所に、溶
融亜鉛めっき浴導入口および調整後溶融亜鉛めっき浴排
出口を有する外側に加熱源が配置されている容器内に、
上部に金属チップ層、下部にセラミックフィルター層を
設けたことを特徴とする溶融亜鉛めっき浴のアルミニウ
ム含有量調整装置。
2. A heating source is disposed outside a continuous hot-dip galvanizing line, which has a hot-dip galvanizing bath inlet and a hot-dip galvanizing bath outlet after adjustment, at a location where the aluminum content of the hot-dip galvanizing bath is adjusted. Inside the container,
An apparatus for adjusting an aluminum content in a hot dip galvanizing bath, which is provided with a metal chip layer on an upper part and a ceramic filter layer on a lower part.
JP17389092A 1992-06-08 1992-06-08 Method for adjusting aluminum content in galvanizing bath and device therefor Withdrawn JPH05339690A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17389092A JPH05339690A (en) 1992-06-08 1992-06-08 Method for adjusting aluminum content in galvanizing bath and device therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17389092A JPH05339690A (en) 1992-06-08 1992-06-08 Method for adjusting aluminum content in galvanizing bath and device therefor

Publications (1)

Publication Number Publication Date
JPH05339690A true JPH05339690A (en) 1993-12-21

Family

ID=15969007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17389092A Withdrawn JPH05339690A (en) 1992-06-08 1992-06-08 Method for adjusting aluminum content in galvanizing bath and device therefor

Country Status (1)

Country Link
JP (1) JPH05339690A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011511166A (en) * 2008-02-08 2011-04-07 シーメンス ヴェ メタルス テクノロジーズ エスアーエス Hot dipping equipment for steel strips

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011511166A (en) * 2008-02-08 2011-04-07 シーメンス ヴェ メタルス テクノロジーズ エスアーエス Hot dipping equipment for steel strips

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A300 Withdrawal of application because of no request for examination

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Effective date: 19990831