JP2003113455A - FLUX AND METHOD FOR HOT-DIP PLATING Al-Zn ALLOY - Google Patents
FLUX AND METHOD FOR HOT-DIP PLATING Al-Zn ALLOYInfo
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- JP2003113455A JP2003113455A JP2001308216A JP2001308216A JP2003113455A JP 2003113455 A JP2003113455 A JP 2003113455A JP 2001308216 A JP2001308216 A JP 2001308216A JP 2001308216 A JP2001308216 A JP 2001308216A JP 2003113455 A JP2003113455 A JP 2003113455A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、Ａｌ−Ｚｎ系合金
を１浴法により鋼材にめっきする方法に関するものであ
る。詳しくは、鋼材のめっき前処理に用いるフラックス
と、そのフラックスを用いるめっき方法に関するもので
ある。TECHNICAL FIELD The present invention relates to a method of plating a steel material with an Al--Zn alloy by a one-bath method. More specifically, the present invention relates to a flux used for pretreatment of a steel material and a plating method using the flux.
【０００２】[0002]
【従来の技術】溶融Ａｌ−Ｚｎ系合金めっきを施す方法
として、鋼材に溶融Ｚｎめっきを施し次いで溶融Ａｌ−
Ｚｎ系合金浴に浸漬する方法が、２浴法または２段めっ
き法等の呼称でよく知られ、広く用いられている。この
方法は溶融Ｚｎ浴と溶融Ａｌ−Ｚｎ系合金浴を準備する
必要があるため経済的な負担が大きい。また、めっき設
備等の事情により、溶融Ｚｎめっきを施した後、浴を入
れ替えて、再度溶融Ａｌ−Ｚｎ系合金浴に浸漬せざるを
得ない場合があり、製造効率が大きく低下する。2. Description of the Related Art As a method for applying a molten Al-Zn alloy plating, a steel material is subjected to a molten Zn plating and then a molten Al-Zn alloy is applied.
The method of immersing in a Zn-based alloy bath is well known by the name of two-bath method or two-step plating method and is widely used. This method has a large economical burden because it is necessary to prepare a molten Zn bath and a molten Al-Zn alloy bath. In addition, due to circumstances such as plating equipment, there is a case where the bath is replaced after being subjected to hot-dip Zn plating, and the bath must be immersed again in the hot-dip Al-Zn alloy bath, resulting in a large decrease in production efficiency.
【０００３】１浴法としては、溶融塩フラックスを用い
てめっきを施す方法が特開平４−３２３３５６号公報に
開示され、４０〜８０％程度の高濃度にＡｌを含有する
溶融Ａｌ−Ｚｎ合金めっきに有効である。しかし、この
方法は、鋼材をめっき浴から引き上げた後に遠心分離を
おこなって付着したフラックスを除去する必要があるた
め、形鋼や鋼管等のような大型の鉄鋼製品には適さな
い。As a one-bath method, a method of performing plating using a molten salt flux is disclosed in Japanese Patent Laid-Open No. 4-323356, and molten Al-Zn alloy plating containing Al in a high concentration of about 40 to 80%. Is effective for. However, this method is not suitable for large-sized steel products such as shaped steel and steel pipes, because it is necessary to remove the flux that has adhered by pulling the steel material from the plating bath and then performing centrifugal separation.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、８０質量％
以下のＡｌを含有するＡｌ−Ｚｎ系合金を、鋼材の大き
さや形状によらず高品質かつ経済的にめっきすることを
可能とする１浴めっきに必須のフラックスおよびこれら
れを用いためっき方法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention is 80% by mass.
An Al-Zn alloy containing Al as described below is used as a flux essential for one-bath plating that enables high-quality and economical plating regardless of the size and shape of the steel material, and a plating method using the flux. The purpose is to provide.
【０００５】[0005]
【課題を解決するための手段】かかる課題を解決するた
め、本発明者はフラックスの成分および組成を検討した
結果、水溶性である上記フラックスを見い出し、これに
よりＡｌ−Ｚｎ系合金の１浴めっき法を完成した。すな
わち、本発明の要旨は、
（１）ｍｏｌ％で、（ａ）ＺｎＣｌ2 を６５〜８５％、
（ｂ）アルカリ金属元素もしくはアルカリ土類金属元素
のフッ化物またはケイフッ化物のいずれか１種類以上を
合計で０．５〜３％、（ｃ）アルカリ金属元素もしくは
アルカリ土類金属元素の塩化物のいずれか１種類以上を
合計で５〜２５％、（ｄ）Ｓｎ，Ｉｎ，Ｔｌ，Ｓｂ，Ｂ
ｉの塩化物のうち１種類以上を合計で５％を超えて２０
％以下で含有したことを特徴とするフラックス。In order to solve such a problem, the present inventor has studied the components and composition of the flux, and as a result, found the above-mentioned flux which is water-soluble. Completed the law. That is, the gist of the present invention is (1) mol% and (a) ZnCl 2 of 65 to 85%,
(B) 0.5 to 3% in total of at least one kind of fluoride or silicofluoride of alkali metal element or alkaline earth metal element, (c) chloride of alkali metal element or alkaline earth metal element 5% to 25% in total of any one or more, (d) Sn, In, Tl, Sb, B
20 more than 5% in total of one or more chlorides of i
%, A flux characterized by being contained in less than or equal to%.
【０００６】（２）鋼材を前記（１）に記載のフラック
スに浸漬し、乾燥後、８０質量％以下のＡｌを含有する
溶融Ａｌ−Ｚｎ系合金浴に浸漬することを特徴とする溶
融Ａｌ−Ｚｎ系合金めっき方法。
（３）Ａｌ含有量に対して２〜１２質量％のＳｉを含有
する溶融Ａｌ−Ｚｎ系合金浴を用いることを特徴とする
前記（２）に記載の溶融Ａｌ−Ｚｎ系合金めっき方法。
（４）上記溶融Ａｌ−Ｚｎ系合金浴に、さらに１０質量
％以下のＭｇを含有することを特徴とする上記前記
（２）または（３）に記載の溶融Ａｌ−Ｚｎ系合金めっ
き方法である。(2) Molten Al-characterized in that the steel material is dipped in the flux described in (1) above, dried and then dipped in a molten Al-Zn alloy bath containing 80% by mass or less of Al. Zn-based alloy plating method. (3) The hot-dip Al-Zn alloy plating method according to (2), wherein a hot-dip Al-Zn-based alloy bath containing 2 to 12 mass% of Si with respect to the Al content is used. (4) The molten Al-Zn alloy plating method according to (2) or (3) above, wherein the molten Al-Zn alloy bath further contains 10 mass% or less of Mg. .
【０００７】[0007]
【発明の実施の形態】本発明者は、Ａｌの含有量が８０
質量％以下の溶融Ａｌ−Ｚｎ系合金浴を用いて、１浴式
のどぶづけ法によってめっきを施す方法を検討した。そ
の結果、フラックスを特定の組成範囲に調製することに
よって、上記目的を達成することが可能であることを見
い出した。その内容について以下に詳細に説明する。本
発明のフラックスは、（１）ＺｎＣｌ2 を主成分とす
る。これは、鋼材を酸洗してからめっき浴に浸漬するま
での間に鋼材表面に生成した酸化皮膜を、めっき浴中で
除去する作用を有し、フラックス成分として必須であ
る。そして、その含有量は６５〜８５ｍｏｌ％とする。
含有量が６５ｍｏｌ％より少ないと不めっきになりやす
く、８５ｍｏｌ％を超えるとめっき表面に異物が付着し
やすくなる。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have found that the Al content is 80
Using a molten Al-Zn-based alloy bath of not more than mass%, a method of plating by the one-bath method of hitting was investigated. As a result, they have found that the above object can be achieved by adjusting the flux to a specific composition range. The contents will be described in detail below. The flux of the present invention contains (1) ZnCl 2 as a main component. This has an action of removing the oxide film formed on the surface of the steel material in the plating bath between the pickling of the steel material and the immersion in the plating bath, and is essential as a flux component. And the content shall be 65-85 mol%.
If the content is less than 65 mol%, non-plating tends to occur, and if it exceeds 85 mol%, foreign matter tends to adhere to the plating surface.
【０００８】次に、（２）アルカリ金属元素もしくはア
ルカリ土類金属元素のフッ化物またはケイフッ化物につ
いて説明する。めっき浴中のＡｌ濃度が高くなると、浴
表面にＡｌの酸化物（例えば、Ａｌ2 Ｏ3 ）による薄い
膜が生成しやすくなるが、これは浴と鋼材の界面に介在
して不めっきの原因となる。鋼材がめっき浴に浸漬する
直前に、このＡｌ酸化膜を機械的に除去できればよい
が、生成速度が速く完全には除去できない。上記フッ化
物またはケイフッ化物はＡｌの酸化物を溶解する性質が
あり、不めっきを防止するためにフラックス成分として
必要である。そして、その含有量は０．５〜３ｍｏｌ％
とする。含有量が０．５ｍｏｌ％より少ないと不めっき
を発生し、３ｍｏｌ％を超えると異物が点状に付着する
ようになって好ましくない。Next, (2) a fluoride or silicofluoride of an alkali metal element or an alkaline earth metal element will be described. When the Al concentration in the plating bath increases, a thin film of Al oxide (eg, Al 2 O 3 ) is likely to be formed on the bath surface, which is the cause of non-plating due to the presence of the interface between the bath and steel. Becomes It suffices if the Al oxide film can be mechanically removed immediately before the steel material is immersed in the plating bath, but the production rate is high and it cannot be completely removed. The above-mentioned fluoride or silicofluoride has a property of dissolving Al oxide, and is necessary as a flux component to prevent non-plating. And the content is 0.5 to 3 mol%
And When the content is less than 0.5 mol%, non-plating occurs, and when it exceeds 3 mol%, foreign matters adhere in a dot shape, which is not preferable.
【０００９】３番目の成分である（３）アルカリ金属元
素もしくはアルカリ土類金属元素の塩化物は、めっき浴
と鋼材との濡れ性を高め、めっきの密着性を確保するた
めに添加する。そして、その含有量は５〜２５ｍｏｌ％
とする。含有量が５ｍｏｌ％より少ないとめっき密着性
が低下する。また、２５ｍｏｌ％を超えると、めっきの
光沢が甚だしく損なわれると同時に、めっき表面の平滑
性が低下する。The third component (3) chloride of an alkali metal element or an alkaline earth metal element is added in order to enhance the wettability between the plating bath and the steel material and to secure the adhesion of the plating. And the content is 5 to 25 mol%
And If the content is less than 5 mol%, the plating adhesion is reduced. On the other hand, when it exceeds 25 mol%, the gloss of the plating is significantly impaired, and at the same time, the smoothness of the plating surface is deteriorated.
【００１０】最後に、（４）Ｓｎ，Ｉｎ，Ｔｌ，Ｓｂ，
Ｂｉの塩化物について説明する。主成分のＺｎＣｌ2 は
鋼材表面の酸化皮膜を除去するためのものであることは
上述の通りであるが、この作用はそれほど強力ではな
い。これを補うために、通常はＮＨ4 Ｃｌを一定の比
率、例えばＺｎＣｌ2 が１ｍｏｌに対して０．５〜１ｍ
ｏｌ程度で共存させるのであるが、めっき浴中のＡｌ濃
度が高くなるとフラックスとＡｌの反応生成物が異物と
してめっき面に付着しやすくなって好ましくない。Finally, (4) Sn, In, Tl, Sb,
The chloride of Bi will be described. As described above, the main component ZnCl 2 is for removing the oxide film on the steel material surface, but this action is not so strong. In order to make up for this, usually, NH 4 Cl is added at a fixed ratio, for example, ZnCl 2 is 0.5 to 1 m per 1 mol.
However, if the Al concentration in the plating bath becomes high, the reaction product of the flux and Al easily adheres to the plating surface as foreign matter, which is not preferable.
【００１１】これに対して、Ｓｎ，Ｉｎ，Ｔｌ，Ｓｂ，
Ｂｉの塩化物は単独ではフラックスとしての作用をほと
んど示さないが、ＺｎＣｌ2 と適当な比率で共存させた
場合は不めっき等の発生が抑制され且つ、ＮＨ4 Ｃｌを
用いた場合のような異物の生成は少なく、フラックス成
分として有効に作用する。そして、その含有量は５ｍｏ
ｌ％を超えて２０ｍｏｌ％以下、好ましくは７．５ｍｏ
ｌ％を超えて２０ｍｏｌ％以下とする。また、質量で表
示すると、１０質量％を超えて２０質量％以下が好まし
い。含有量が５ｍｏｌ％以下の場合、不めっき等の発生
の抑制や異物の生成を少なくできる効果が小さくなり、
２０ｍｏｌ％を超えると表面にフラックス由来の異物が
付着しやすくなる。質量表示の場合も同様の理由によ
る。On the other hand, Sn, In, Tl, Sb,
Bi chloride alone has almost no effect as a flux by itself, but when it is made to coexist with ZnCl 2 in an appropriate ratio, the occurrence of non-plating and the like is suppressed, and foreign substances such as when NH 4 Cl is used. Is less produced and acts effectively as a flux component. And the content is 5mo
more than 1% and 20 mol% or less, preferably 7.5 mo
It is more than 1% and 20 mol% or less. When it is expressed by mass, it is preferably more than 10 mass% and 20 mass% or less. When the content is 5 mol% or less, the effect of suppressing the occurrence of non-plating or the like and reducing the generation of foreign matter becomes small,
If it exceeds 20 mol%, foreign matter derived from the flux tends to adhere to the surface. The same applies to the case of displaying the mass.
【００１２】つぎに、上述のフラックスを用いるめっき
方法について説明する。まず、鋼材の表面を脱脂、酸洗
等により表面を十分に清浄にした後、この鋼材を本発明
のフラックスに浸漬する。本発明のフラックスは、ハン
ドリング性の点から水溶液として用いることが望まし
い。各種成分の合計の濃度（ｇ／ｌ）をとくに規定する
ものではないが、薄すぎるとフラックスとしての効果が
低下する。また、むやみに濃くしても性能上はほとんど
変わらないばかりか、フラックスに起因する異物付着の
原因になることがある。したがって、通常は１００〜３
００ｇ／ｌ程度が好ましい。また、水に分散することに
よって白色の沈澱物を生成するが、この沈澱物はｐＨを
酸性側に調節することによって容易に消失し、透明な水
溶液となるので、例えば塩酸等を添加するとよい。な
お、白色の沈澱物やｐＨの調節によって、フラックスの
性能すなわちめっき性や製品品質にはなんら影響はな
い。Next, a plating method using the above-mentioned flux will be described. First, the surface of a steel material is thoroughly cleaned by degreasing, pickling, etc., and then the steel material is immersed in the flux of the present invention. The flux of the present invention is preferably used as an aqueous solution from the viewpoint of handleability. The total concentration (g / l) of various components is not particularly specified, but if it is too thin, the effect as a flux decreases. In addition, even if the density is excessively high, the performance is hardly changed, and in some cases, foreign matter may be attached due to the flux. Therefore, usually 100 to 3
About 100 g / l is preferable. A white precipitate is produced by dispersing it in water, but this precipitate is easily eliminated by adjusting the pH to an acidic side and becomes a transparent aqueous solution. For example, hydrochloric acid or the like may be added. The white precipitate and the pH adjustment have no influence on the flux performance, that is, the plating property and the product quality.
【００１３】フラックス浴の温度はとくに規定しない
が、鋼材とフラックスの反応を促進させるためおよび、
鋼材に付着したフラックスの乾燥を速めるために、通常
は６０〜８０℃程度とするのが好ましい。また、浸漬時
間もとくに規定するものではなく任意に設定してかまわ
ないのであるが、通常は５〜１０秒程度で十分である。
もちろん、これよりも長くてもめっき製品品質上は問題
はない。鋼材をフラックス浴に浸漬した後、乾燥炉やイ
ンダクションヒーターなどの加熱装置を用いて付着した
フラックスを十分に乾燥させることが好ましい。加熱乾
燥をおこなう場合は、２５０℃以下、好ましくは２００
℃以下とするのがよい。これは、２５０℃を超えるとフ
ラックスが溶融しやすくなって、良好なめっきを得るこ
とができなくなるためである。Although the temperature of the flux bath is not particularly specified, in order to accelerate the reaction between the steel material and the flux,
In order to speed up the drying of the flux attached to the steel material, it is usually preferable to set the temperature to about 60 to 80 ° C. Further, the immersion time is not particularly specified and may be set arbitrarily, but usually about 5 to 10 seconds is sufficient.
Of course, even if it is longer than this, there is no problem in terms of the quality of plated products. After the steel material is immersed in the flux bath, it is preferable to sufficiently dry the adhered flux using a heating device such as a drying furnace or an induction heater. When heat drying is performed, the temperature is 250 ° C or lower, preferably 200 ° C.
It is better to set the temperature below ℃. This is because when the temperature exceeds 250 ° C., the flux is easily melted and good plating cannot be obtained.
【００１４】つぎに、このようにしてフラックス処理を
おこなった鋼材を、Ａｌを含むＡｌ−Ｚｎ系合金めっき
浴に浸漬するのであるが、浴中のＡｌ含有量が８０質量
％を超えると、めっき表面にドロス付着や不めっき等の
欠陥が生じやすくなる。したがって、本発明のフラック
スは、８０質量％以下のＡｌを含むＡｌ−Ｚｎ系合金め
っきに対して用いるのが好ましい。また、浴中のＡｌ含
有量の下限値は特に規定しないが、２０質量％を超える
Ａｌ濃度ではより高い耐食性が得られるため、２０質量
％を超えるＡｌを含有するＡｌ−Ｚｎ系合金めっきに対
して用いるのが好ましい。Next, the steel material thus flux-treated is immersed in an Al-Zn alloy plating bath containing Al. When the Al content in the bath exceeds 80% by mass, plating is performed. Defects such as dross adhesion and non-plating are likely to occur on the surface. Therefore, the flux of the present invention is preferably used for Al-Zn alloy plating containing 80% by mass or less of Al. Further, the lower limit of the Al content in the bath is not particularly specified, but since higher corrosion resistance can be obtained at an Al concentration of more than 20% by mass, the Al-Zn alloy plating containing Al of more than 20% by mass can be used. It is preferable to use.
【００１５】また、めっき浴中のＡｌの含有量が２０質
量％を超える場合、鋼面直上にＦｅ−Ａｌ系合金層が生
成して、めっき密着性や曲げ加工性等の性能が大きく低
下する場合がある。これを防ぐために、通常、浴中のＡ
ｌ含有量に対して２〜１２質量％程度のＳｉを添加する
ことがさらに好ましく、このようなめっき浴に対しても
本発明のフラックスは問題なく適用できる。Ａｌ含有量
に対するＳｉの添加量が２質量％未満の場合、めっき密
着性や曲げ加工性等の性能の低下を防止する効果が小さ
くなる。また、Ａｌ含有量に対するＳｉの添加量が１２
質量％を超えても、その効果はあまり変化しない。Further, when the content of Al in the plating bath exceeds 20% by mass, an Fe-Al alloy layer is formed directly on the steel surface, and performances such as plating adhesion and bending workability are greatly deteriorated. There are cases. To prevent this, A in the bath is usually used.
It is more preferable to add about 2 to 12 mass% of Si with respect to 1 content, and the flux of the present invention can be applied to such a plating bath without any problem. When the amount of Si added to the Al content is less than 2% by mass, the effect of preventing deterioration in performance such as plating adhesion and bending workability becomes small. Further, the addition amount of Si relative to the Al content is 12
Even if it exceeds the mass%, the effect does not change so much.
【００１６】上記Ａｌ−Ｚｎ系めっき浴中に１０質量％
以下のＭｇが添加されていても、本発明のフラックスを
用いることによって容易にめっきは可能である。Ｍｇを
添加することによって、Ａｌ−Ｚｎ系めっきの耐食性は
とくに塩害環境で向上する。しかし、Ｍｇの浴中濃度が
１０質量％を超えると、ドロス付着や不めっき等の欠陥
が生じやすくなる。したがって、Ｍｇを添加したＡｌ−
Ｚｎ系めっきに本発明のフラックスを適用する場合に
は、Ｍｇの濃度を１０質量％以下とするのが好ましい。10% by mass in the Al-Zn-based plating bath
Even if the following Mg is added, plating can be easily performed by using the flux of the present invention. By adding Mg, the corrosion resistance of the Al-Zn based plating is improved especially in a salt damage environment. However, if the concentration of Mg in the bath exceeds 10% by mass, defects such as dross adhesion and non-plating are likely to occur. Therefore, Al-containing Mg
When the flux of the present invention is applied to Zn-based plating, the Mg concentration is preferably 10% by mass or less.
【００１７】めっき浴温度、浸漬時間、侵入速度、引上
速度およびめっき後の鋼材冷却速度等の製造条件は、鋼
材のサイズ、めっき浴組成、めっき厚み等によって適切
に決定されるべきものであるので、ここでは敢て規定し
ないが、例えば、５５質量％のＡｌ，１．６質量％のＳ
ｉおよび残部がＺｎと不可避的不純物からなるめっき浴
を用いる場合は、めっき浴温度は６２０〜６５０℃と
し、浸漬時間は厚さが０．８ｍｍの薄板材で３〜５秒程
度、φ４ｍｍの線材で３０秒程度、厚さ１０ｍｍの鋼板
で２〜５分程度を目安とするとよい。また、めっき浴の
温度が高くなると、Ｆｅを含む合金層が急速に成長しや
すくなり、光沢のないめっきになるので、水冷等の方法
によってできるだけ急速に冷却するのが好ましく、冷却
速度はとくに規定するものではないが、４０℃／秒程度
以上が好適である。Manufacturing conditions such as plating bath temperature, immersion time, penetration rate, pulling rate and steel material cooling rate after plating should be appropriately determined depending on the size of the steel material, the composition of the plating bath, the plating thickness and the like. Therefore, although not specified here, for example, 55% by mass of Al, 1.6% by mass of S
When a plating bath consisting of i and the balance Zn and unavoidable impurities is used, the plating bath temperature is 620 to 650 ° C., and the dipping time is about 3 to 5 seconds for a thin plate material having a thickness of 0.8 mm and a wire rod of φ4 mm. As a guide, it may be about 30 seconds and about 2 to 5 minutes with a steel plate having a thickness of 10 mm. Further, when the temperature of the plating bath becomes high, the alloy layer containing Fe easily grows rapidly and the plating becomes dull, so it is preferable to cool as rapidly as possible by a method such as water cooling, and the cooling rate is particularly prescribed. However, it is preferably about 40 ° C./sec or more.
【００１８】[0018]
【実施例】本発明の内容について実施例にもとづいて詳
細に説明する。
（実施例１）本実施例において、被めっき材は１５０ｍ
ｍ×７０ｍｍ×４ｍｍの鋼板を用いた。この鋼板を市販
のアルカリ性脱脂剤により脱脂をおこなった後、７０℃
の１０％ＨＣｌ水溶液に約１０分間浸漬してミルスケー
ルを除去した。つぎに、所定の組成に調製したフラック
ス（全濃度２００ｇ／ｌ，温度を８０℃に設定）に約５
秒間浸漬し、２００℃のオーブン中で約５分間乾燥し
た。この鋼板を、５５質量％のＡｌ，Ａｌ含有量に対し
て３．０質量％のＳｉおよび残部がＺｎと不可避的不純
物からなり、温度を６４０℃に設定しためっき浴に５分
間浸漬した後、水中に没して冷却した。EXAMPLES The contents of the present invention will be described in detail based on examples. (Example 1) In this example, the material to be plated is 150 m
A m × 70 mm × 4 mm steel plate was used. After degreasing this steel sheet with a commercially available alkaline degreasing agent, 70 ° C
The mill scale was removed by immersing in 10% HCl aqueous solution for 10 minutes. Next, the flux prepared to the specified composition (total concentration 200 g / l, temperature set to 80 ° C.) was added to about 5
It was dipped for 2 seconds and dried in an oven at 200 ° C. for about 5 minutes. This steel sheet was immersed for 5 minutes in a plating bath in which 55% by mass of Al, 3.0% by mass of Si with respect to the Al content, and the balance Zn and unavoidable impurities, and the temperature was set at 640 ° C. for 5 minutes, It was submerged in water and cooled.
【００１９】このようにして作製しためっき鋼板の外観
を評価した結果を表１に示した。この表１から、フラッ
クスがつぎの組成範囲内にあるとき、外観の良好なめっ
きが得られることが判明した。すなわち、良好な組成範
囲とは
（ａ）ＺｎＣｌ2 ：６５〜８５ｍｏｌ％
（ｂ）アルカリ金属元素もしくはアルカリ土類金属元素
のフッ化物またはケイフッ化物のいずれか１種類以上：
合計で０．５〜３ｍｏｌ％
（Ｃ）アルカリ金属元素もしくはアルカリ土類金属元素
の塩化物のいずれか１種類以上：合計で５〜２５ｍｏｌ
％
（ｄ）Ｓｎ，Ｉｎ，Ｔｌ，Ｓｂ，Ｂｉの塩化物のうち１
種類以上：合計で５〜２０ｍｏｌ％である。The results of evaluating the appearance of the plated steel sheet thus produced are shown in Table 1. From this Table 1, it was found that when the flux was within the following composition range, plating with good appearance could be obtained. That is, the good composition range (a) ZnCl 2: 65~85mol% (b) any one or more of fluoride or silicofluoride alkali metal element or an alkaline earth metal element:
0.5 to 3 mol% in total (C) One or more kinds of chlorides of alkali metal elements or alkaline earth metal elements: 5 to 25 mol in total
% (D) Of chlorides of Sn, In, Tl, Sb, Bi 1
Type or more: 5 to 20 mol% in total.
【００２０】[0020]
【表１】 [Table 1]
【００２１】（実施例２）本実施例において、５３質量
％のＡｌ，３質量％のＭｇ，Ａｌ含有量に対して３．０
質量％のＳｉおよび残部がＺｎと不可避的不純物からな
るめっき浴を用いた。めっき浴の組成以外は上記実施例
１と同様の条件および方法で実験をおこなった。このよ
うにして作製しためっき鋼板の外観を評価した結果、上
記表１と同様の結果が得られた。すなわち、良好な組成
範囲とは
（ａ）ＺｎＣｌ2 ：６５〜８５ｍｏｌ％
（ｂ）アルカリ金属元素もしくはアルカリ土類金属元素
のフッ化物またはケイフッ化物のいずれか１種類以上：
合計で０．５〜３ｍｏｌ％
（Ｃ）アルカリ金属元素もしくはアルカリ土類金属元素
の塩化物のいずれか１種類以上：合計で５〜２５ｍｏｌ
％
（ｄ）Ｓｎ，Ｉｎ，Ｔｌ，Ｓｂ，Ｂｉの塩化物のうち１
種類以上：合計で５〜２０ｍｏｌ％である。(Embodiment 2) In this embodiment, 3.0% by mass of Al, 3% by mass of Mg, and 3.0 with respect to Al content.
A plating bath containing mass% Si and the balance Zn and unavoidable impurities was used. An experiment was conducted under the same conditions and methods as in Example 1 except for the composition of the plating bath. As a result of evaluating the appearance of the plated steel sheet thus produced, the same results as in Table 1 above were obtained. That is, the good composition range (a) ZnCl 2: 65~85mol% (b) any one or more of fluoride or silicofluoride alkali metal element or an alkaline earth metal element:
0.5 to 3 mol% in total (C) One or more kinds of chlorides of alkali metal elements or alkaline earth metal elements: 5 to 25 mol in total
% (D) Of chlorides of Sn, In, Tl, Sb, Bi 1
Type or more: 5 to 20 mol% in total.
【００２２】[0022]
【発明の効果】本発明のフラックスを用いることによっ
て、これまで困難とされていた、高濃度のＡｌを含有す
るＡｌ−Ｚｎ系合金めっきの１浴どぶづけめっきが可能
となる。これによって、製造上の経済的負担が軽く、鋼
材の大きさや形状によらず高品質のめっきを得ること可
能となる。EFFECTS OF THE INVENTION By using the flux of the present invention, it is possible to perform one-bath drip plating of Al-Zn alloy plating containing a high concentration of Al, which has been difficult until now. As a result, it is possible to obtain a high-quality plating regardless of the size and shape of the steel material, because the economical burden on manufacturing is light.
Claims (4)
８５％、（ｂ）アルカリ金属元素もしくはアルカリ土類
金属元素のフッ化物またはケイフッ化物のいずれか１種
類以上を合計で０．５〜３％、（ｃ）アルカリ金属元素
もしくはアルカリ土類金属元素の塩化物のいずれか１種
類以上を合計で５〜２５％、（ｄ）Ｓｎ，Ｉｎ，Ｔｌ，
Ｓｂ，Ｂｉの塩化物のうち１種類以上を合計で５％を超
えて２０％以下で含有したことを特徴とするフラック
ス。1. The amount of (a) ZnCl 2 is 65 to 5 mol%.
85%, (b) 0.5 to 3% of any one or more of fluorides or silicofluorides of alkali metal elements or alkaline earth metal elements, (c) of alkali metal elements or alkaline earth metal elements 5-25% in total of any one or more of chlorides, (d) Sn, In, Tl,
A flux containing one or more kinds of chlorides of Sb and Bi in a total amount of more than 5% and 20% or less.
漬し、乾燥後、８０質量％以下のＡｌを含有する溶融Ａ
ｌ−Ｚｎ系合金浴に浸漬することを特徴とする溶融Ａｌ
−Ｚｎ系合金めっき方法。2. A molten material containing 80% by mass or less of Al after immersing a steel material in the flux according to claim 1 and drying it.
Molten Al characterized by being immersed in a 1-Zn alloy bath
-Zn alloy plating method.
ｉを含有する溶融Ａｌ−Ｚｎ系合金浴を用いることを特
徴とする請求項２に記載の溶融Ａｌ−Ｚｎ系合金めっき
方法。3. 2 to 12% by mass of S based on the Al content
The molten Al-Zn alloy plating method according to claim 2, wherein a molten Al-Zn alloy bath containing i is used.
質量％以下のＭｇを含有することを特徴とする請求項２
または３に記載の溶融Ａｌ−Ｚｎ系合金めっき方法。4. A molten Al—Zn-based alloy bath further comprising 10
% Of Mg or less is contained.
Alternatively, the hot dip Al-Zn alloy plating method described in 3 above.
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005290418A (en) * | 2004-03-31 | 2005-10-20 | Jfe Steel Kk | HOT-DIP Al-Zn ALLOY PLATED STEEL SHEET SUPERIOR IN PRESS FORMABILITY, AND MANUFACTURING METHOD THEREFOR |
| JP2010133022A (en) * | 2008-11-04 | 2010-06-17 | Koyo Kogyo Kk | Metal plating material and method for producing the same |
| CN114561610A (en) * | 2022-04-29 | 2022-05-31 | 湖南大学 | Plating assistant agent and plating assistant process |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5621398B2 (en) * | 2010-08-16 | 2014-11-12 | 一般社団法人日本溶融亜鉛鍍金協会 | Smokeless flux for hot dip galvanizing and hot dip galvanizing method using the flux |
-
2001
- 2001-10-04 JP JP2001308216A patent/JP3588452B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005290418A (en) * | 2004-03-31 | 2005-10-20 | Jfe Steel Kk | HOT-DIP Al-Zn ALLOY PLATED STEEL SHEET SUPERIOR IN PRESS FORMABILITY, AND MANUFACTURING METHOD THEREFOR |
| JP2010133022A (en) * | 2008-11-04 | 2010-06-17 | Koyo Kogyo Kk | Metal plating material and method for producing the same |
| CN114561610A (en) * | 2022-04-29 | 2022-05-31 | 湖南大学 | Plating assistant agent and plating assistant process |
| CN114561610B (en) * | 2022-04-29 | 2022-07-12 | 湖南大学 | Plating assistant agent and plating assistant process |
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