JPH05171392A - Method for galvanizing high-strength steel sheet - Google Patents
Method for galvanizing high-strength steel sheetInfo
- Publication number
- JPH05171392A JPH05171392A JP33851191A JP33851191A JPH05171392A JP H05171392 A JPH05171392 A JP H05171392A JP 33851191 A JP33851191 A JP 33851191A JP 33851191 A JP33851191 A JP 33851191A JP H05171392 A JPH05171392 A JP H05171392A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- hot
- alloying
- strength steel
- plating
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高強度の難めっき鋼板
に亜鉛系溶融めっきおよび合金化溶融亜鉛めっきを施す
方法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 for subjecting a high-strength hard-to-plate steel sheet to zinc-based hot dip galvanizing and galvannealing.
【０００２】[0002]
【従来の技術】溶融亜鉛めっき鋼板や合金化溶融亜鉛め
っき鋼板は、耐食性に優れていることから、自動車車体
部品や家電製品等の外装材に広く用いられている。特に
合金化溶融亜鉛めっき鋼板は塗装密着性、塗装仕上がり
外観および塗装後耐食性が優れているため、自動車用防
錆鋼板としての需要が急増している。2. Description of the Related Art Hot-dip galvanized steel sheets and alloyed hot-dip galvanized steel sheets are widely used as exterior materials for automobile body parts, home electric appliances, etc. because of their excellent corrosion resistance. In particular, alloyed hot-dip galvanized steel sheets are excellent in paint adhesion, paint finish appearance and post-paint corrosion resistance, so demand for rustproof steel sheets for automobiles is rapidly increasing.
【０００３】ところで、近年かかる溶融亜鉛めっき鋼板
に対する性能にも、新たな社会情勢の変化に伴い、従来
にない特性が要求されている。例えば、地球環境問題、
特に炭酸ガス低減対策から自動車の燃費の向上が必要と
なり、その最も有効な方法として車体の軽量化が緊急の
課題となっている。すなわち、成形加工性や溶接性、耐
食性等を損なうことなく板厚が薄くできる自動車用の高
強度合金化溶融亜鉛めっき鋼板が望まれている。かかる
要求に応えるためには、極低炭素鋼に成形加工性を損な
うことなく鋼板強度を高めることができるＰ、Ｓｉ、Ｍ
ｎ、Ｔｉ、Ｃｒ、Ａｌ、Ｂ、Ｎｂ等の合金元素の１種ま
たは２種以上の添加が必要となる。By the way, in recent years, the performance of the hot-dip galvanized steel sheet is required to have unprecedented characteristics as a result of new social changes. For example, global environmental issues,
In particular, it is necessary to improve the fuel efficiency of automobiles in order to reduce carbon dioxide, and the most effective method is to reduce the weight of the vehicle body, which is an urgent issue. That is, there is a demand for a high-strength galvannealed steel sheet for automobiles that can be thinned without deteriorating the formability, weldability, corrosion resistance and the like. In order to meet such demands, it is possible to increase the strength of a steel sheet without impairing the formability of ultra-low carbon steel P, Si, M
It is necessary to add one or more alloying elements such as n, Ti, Cr, Al, B and Nb.
【０００４】しかし、上記のようなＰ、Ｓｉ、Ｃｒ等の
元素は、酸化され易く還元し難いため、連続溶融亜鉛め
っき製造ライン（例えば、ゼンジミアライン）の焼鈍工
程で、安定した酸化物を形成し、また酸化物の下には前
述の元素が濃化する傾向がある。この酸化物は還元性ガ
ス雰囲気中で焼鈍しても充分には還元されず、不均一に
残留する。そのため、焼鈍、冷却後の溶融亜鉛めっき時
にめっき濡れ性が阻害され、点状のめっき欠陥や甚だし
いときは多大な不めっき部が発生したり、たとえ不めっ
きでなくとも、めっき密着性が著しく劣化する問題が出
る。また、合金化溶融亜鉛めっき鋼板ではこれらの元素
の不均一な残留は合金化の進行を不均一とし、めっき表
面に凹凸模様が生じ、甚だしいものは目視でもわかる白
スジや黒スジと称されている筋ムラ問題が発生すること
が知られている。However, since the above-mentioned elements such as P, Si and Cr are easily oxidized and difficult to reduce, stable oxides are formed in the annealing process of the continuous hot-dip galvanizing production line (for example, Sendzimir line). There is a tendency for the above-mentioned elements to concentrate under the oxide as they form. This oxide is not sufficiently reduced even when annealed in a reducing gas atmosphere, and remains nonuniformly. Therefore, the plating wettability is impaired during hot dip galvanizing after annealing and cooling, and a large number of unplated spots occur when the spots are plated defects or when the plating is not significant. There is a problem to do. In addition, in alloyed hot-dip galvanized steel sheet, the non-uniform residue of these elements makes the progress of alloying non-uniform, and an uneven pattern is generated on the plating surface. It is known that a streak unevenness problem occurs.
【０００５】そこで、このような難めっき鋼板に溶融亜
鉛めっきや合金化溶融亜鉛めっきを施す場合、不めっき
防止と均一合金化（筋ムラ防止）を図るために、予め鋼
板表面に種々の前処理を施すことによる改善法が提案さ
れている。例えば、特開昭５５−１３１１６５号公報に
はＮｉめっきを施す方法が開示されている。また、特開
昭５７−７０２６８号公報、特開昭５７−７９１６０号
公報にはＦｅめっきを施す方法が開示されている。Therefore, when such hot-dip galvanized steel sheets are subjected to hot-dip galvanizing or alloying hot-dip galvanizing, in order to prevent non-plating and uniform alloying (prevention of streak unevenness), various pretreatments are performed on the steel sheet surface in advance. The improvement method by applying is proposed. For example, Japanese Patent Laid-Open No. 55-131165 discloses a method of applying Ni plating. Further, JP-A-57-70268 and JP-A-57-79160 disclose methods for performing Fe plating.
【０００６】さらに特開昭５５−１２２８６５号公報に
は無酸化炉方式において膜厚４００〜10,000Åの酸化皮
膜を形成させた後に、水素を含む雰囲気中で焼鈍する方
法が開示されている。Further, Japanese Patent Application Laid-Open No. 55-122865 discloses a method of forming an oxide film having a film thickness of 400 to 10,000Å in a non-oxidizing furnace system and then annealing in an atmosphere containing hydrogen.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、これら
の方法を実用化するには種々の問題がある。すなわち、
鋼板にＮｉをプレめっきすると、溶融亜鉛めっき時に、
合金化溶融亜鉛めっき鋼板では合金化反応速度を過度に
促進し、甚だしいときには溶融亜鉛めっき時に合金化が
始まり、合金化度のコントロールが極めて困難となる問
題がある。Ｆｅプレめっきに関しては、合金化反応速度
は鋼板上とほぼ同じであるが、不めっきを防止するめっ
き付着量を得るためには大きな設備が必要であり、操業
コストも高い。However, there are various problems in putting these methods into practical use. That is,
When pre-plating a steel sheet with Ni, during hot dip galvanizing,
The alloyed hot-dip galvanized steel sheet has a problem that the alloying reaction rate is excessively accelerated, and in extreme cases, alloying starts during hot-dip galvanizing, making it extremely difficult to control the degree of alloying. Regarding the Fe pre-plating, the alloying reaction rate is almost the same as that on the steel sheet, but large equipment is required to obtain the amount of coating adhered to prevent non-plating, and the operating cost is also high.
【０００８】一方、水素含有の雰囲気中で焼鈍を行なう
前に無酸化炉方式において酸化被膜を形成させる方法
は、インラインで処理する場合、ラインスピード、雰囲
気、鋼中成分の条件で酸化膜量が変動し、その後の合金
化亜鉛めっき層形成時に合金化反応速度が変化する問題
があり実用化に至っていない。On the other hand, in the method of forming an oxide film in the non-oxidizing furnace system before annealing in a hydrogen-containing atmosphere, in the case of in-line processing, the amount of oxide film depends on the conditions of line speed, atmosphere, and steel composition. However, there is a problem that the alloying reaction rate fluctuates and the alloying reaction rate changes during the subsequent formation of the galvannealed layer, which has not been put to practical use.
【０００９】本発明の目的は、鉄よりも被酸化性が強い
元素を含む鋼強度鋼板、例えばＰ、Ｓｉ、Ｍｎ、Ｔｉ、
Ｃｒ、Ａｌ、Ｂ、Ｎｂ等の合金元素の１種または２種以
上の添加を行なった高強度鋼板を母材とし、均一でめっ
き密着性の優れた溶融亜鉛めっきおよび合金化溶融亜鉛
めっきを低コストで製造する方法を提供するものであ
る。特に、従来の不均一に生じる不めっき部を改善し、
表面の均一性が向上した、高強度鋼板を提供する。An object of the present invention is to provide a steel strength steel sheet containing an element that is more oxidizable than iron, such as P, Si, Mn, Ti,
Using a high-strength steel plate containing one or more alloy elements such as Cr, Al, B, and Nb as a base material, it is possible to reduce hot dip galvanizing and alloying hot dip galvanizing that are uniform and have excellent plating adhesion. A method of manufacturing at a cost is provided. In particular, by improving the non-plated part that occurs in the conventional non-uniformity,
Provided is a high-strength steel sheet with improved surface uniformity.
【００１０】[0010]
【課題を解決するための手段】本発明は、鉄よりも被酸
化が強い元素を添加した高強度鋼板を溶融亜鉛めっきす
る方法において、陽極電解処理により鋼板表面に酸化膜
（酸化膜、水酸化膜、水和酸化膜）を形成し、水素を含
む雰囲気中で焼鈍した後、溶融亜鉛めっきすることを特
徴とする高強度鋼板の溶融亜鉛めっき法である。また、
前記溶融亜鉛めっき高強度鋼板をさらに合金化処理する
高強度鋼板の合金化溶融亜鉛めっき法である。The present invention is a method of hot dip galvanizing a high-strength steel sheet to which an element that is more oxidizable than iron is added. A hot dip galvanizing method for a high-strength steel sheet, which comprises forming a film, a hydrated oxide film), annealing in an atmosphere containing hydrogen, and then hot-dip galvanizing. Also,
It is an alloying hot-dip galvanizing method for high-strength steel sheets, which further alloys the hot-dip galvanized high-strength steel sheet.
【００１１】以下、本発明を詳細に説明する。The present invention will be described in detail below.
【００１２】本発明に述べる鋼板は、自動車で使用され
る極低炭素鋼に成形加工性を損なうことなく鋼板強度を
高めることができるＰ、Ｓｉ、Ｍｎ、Ｔｉ、Ｃｒ、Ａ
ｌ、Ｂ、Ｎｂ等の合金元素の１種または２種が添加され
た鋼板である。これら合金元素の中で特に、Ｓｉ、Ｃ
ｒ、Ｍｎ、Ａｌ、Ｐ、ＴｉはＦｅよりも酸化されやす
く、表面濃化した場合、めっき性を阻害しやすい性質を
もつ。The steel sheet described in the present invention is P, Si, Mn, Ti, Cr, A which can enhance the steel sheet strength without deteriorating the formability of ultra-low carbon steel used in automobiles.
It is a steel plate to which one or two alloy elements such as 1, B, and Nb are added. Among these alloy elements, especially Si, C
r, Mn, Al, P, and Ti are more easily oxidized than Fe and have a property of easily impairing the plating property when the surface is concentrated.
【００１３】次にこの鋼板表面に酸化物の酸化膜を形成
する方法としては、金属塩類の１種または２種以上を含
有する水溶液中に鋼板を浸漬し、電解処理する事で容易
に形成せしめることができる。ここで酸化膜とは、酸化
膜、水酸化膜、水和酸化膜を総称するものとする。Next, as a method for forming an oxide film of an oxide on the surface of the steel sheet, the steel sheet is immersed in an aqueous solution containing one or more kinds of metal salts and subjected to an electrolytic treatment for easy formation. be able to. Here, the oxide film is a generic term for an oxide film, a hydroxide film, and a hydrated oxide film.
【００１４】この場合は、鋼板を陽極とし、適当な通電
材料（例えば鉛・ステンレス・Ｐｔめっき板など）を陰
極とする陽極電解処理を施すことにより、溶融亜鉛めっ
きにおけるめっき性に有効な酸化膜を形成できる。In this case, an oxide film effective for the plating property in hot dip galvanization is obtained by performing an anodic electrolytic treatment using a steel plate as an anode and an appropriate current-carrying material (for example, lead / stainless / Pt plated plate) as a cathode. Can be formed.
【００１５】電解液中の金属塩類としては、各種金属の
炭酸塩類、リン酸塩類、硝酸塩類、硫酸塩類、塩化物
類、ホウ酸塩類、水酸化物類などがあげられる。これら
金属塩類の１種または２種以上を電導度を付与するため
に水溶液中に適当濃度で添加すればよいが好ましくは、
金属塩濃度は、１〜１００ｇ／ｌ程度である。Examples of the metal salts in the electrolytic solution include carbonates, phosphates, nitrates, sulfates, chlorides, borates and hydroxides of various metals. One or more of these metal salts may be added to the aqueous solution at an appropriate concentration in order to impart electric conductivity, but preferably,
The metal salt concentration is about 1 to 100 g / l.
【００１６】電解液のｐＨとしては４以上が好ましく、
ｐＨ４以下の場合電解条件を変化させても、陽極酸化膜
が形成されにくい。電解液の浴温は、常温から８０℃の
範囲が好ましく、工業的には４０〜６０℃が望ましい。The pH of the electrolytic solution is preferably 4 or more,
When the pH is 4 or less, the anodic oxide film is difficult to be formed even if the electrolysis conditions are changed. The bath temperature of the electrolytic solution is preferably from room temperature to 80 ° C, and industrially 40 to 60 ° C.
【００１７】電解処理時の通電量（クーロン／ｄｍ2 ）
に関しては、１Ｃ／ｄｍ2 以上が有利である。１Ｃ／ｄ
ｍ2 未満では確実にめっき性を改善する事ができず、不
めっきが発生する。また、５００Ｃ／ｄｍ2 以上では、
不めっきは発生しないが、合金化溶融亜鉛めっきの場合
合金化速度が、過度に促進し、甚だしいときには溶融亜
鉛めっき時に合金化が始まり、合金化度のコントロール
が困難となる。Energization amount during electrolysis (coulomb / dm 2 )
With respect to, 1 C / dm 2 or more is advantageous. 1C / d
If it is less than m 2 , the plating property cannot be surely improved and non-plating occurs. Moreover, at 500 C / dm 2 or more,
Although non-plating does not occur, alloying hot-dip galvanizing excessively accelerates the alloying rate, and in extreme cases, alloying starts during hot-dip galvanizing, making it difficult to control the degree of alloying.
【００１８】電流密度に関しては設備能力に応じて、ま
たはラインスピードに応じて適当に選ぶことができ、一
般には、１〜１００Ａ／ｄｍ2 の範囲の電流密度が選択
されるが、電流密度が高い程、より高いｐＨの電解浴を
採用した方が酸化膜を有効に形成せしめることができ
る。このような電解処理で得られる被膜の成分は、現時
点では明確でないが主に鉄の酸化物もしくは水酸化物と
考えられる。The current density can be appropriately selected according to the facility capacity or the line speed. Generally, a current density in the range of 1 to 100 A / dm 2 is selected, but the current density is high. The oxide film can be effectively formed by using an electrolytic bath having a higher pH. Although the composition of the coating film obtained by such electrolytic treatment is not clear at this point, it is considered to be mainly iron oxide or hydroxide.
【００１９】次に、形成した酸化膜を、還元させるため
水素を含む還元雰囲気中で焼鈍する。この時の焼鈍条件
は酸化物が十分に還元できる条件である。水素を含む還
元雰囲気は水素単独でもよいが、Ｎ2 やＡｒ等との混合
ガスを使い、好ましくは、３〜２５％水素でよい。反応
条件は、少なくとも７５０〜８５０℃にて１秒以上、行
なうのが好ましい。Next, the formed oxide film is annealed in a reducing atmosphere containing hydrogen for reduction. The annealing conditions at this time are conditions under which the oxide can be sufficiently reduced. The reducing atmosphere containing hydrogen may be hydrogen alone, but a mixed gas with N 2 or Ar is used, and preferably 3 to 25% hydrogen. The reaction conditions are preferably at least 750 to 850 ° C. for 1 second or longer.
【００２０】形成させる酸化物の量を前記条件範囲で陽
極電解処理されたものを、表１に示すカソード還元法で
調査すると、還元電気量で０．１ｍＣ／ｃｍ2 の還元可
能な酸化物を表面に形成させた時、めっき性が改善し
た。酸化物を著しく多く形成させると、水素雰囲気中で
十分還元できず、残存酸化物がめっき性を阻害する。When the amount of oxide to be formed was anodically electrolyzed in the above range of conditions and examined by the cathode reduction method shown in Table 1, it was found that a reducible electricity amount of 0.1 mC / cm 2 of reducible oxide was obtained. When formed on the surface, the plating property was improved. If an extremely large amount of oxide is formed, it cannot be sufficiently reduced in a hydrogen atmosphere, and the residual oxide hinders the plating property.
【００２１】一方、これに対処するために十分な還元時
間を与える事は、操業性を悪くすることであり、さらに
多量な還元鉄によって、合金化速度が上昇し、ムラが発
生する問題も生ずる。酸化膜が、めっき性を改善する理
由としては、酸化された鉄がその後、水素を含む雰囲気
中で十分鉄に還元されるため、鋼板表面が活性の鉄とな
り、めっき性が向上するものと考えられる。On the other hand, giving a sufficient reduction time to deal with this causes deterioration of operability, and a large amount of reduced iron increases the alloying rate and causes unevenness. .. The reason why the oxide film improves the plating property is that the oxidized iron is then sufficiently reduced to iron in an atmosphere containing hydrogen, so that the steel sheet surface becomes active iron and the plating property is improved. Be done.
【００２２】次に、このように処理された鋼板を、常法
に従って溶融亜鉛浴中に浸漬し、めっきすることで、溶
融亜鉛めっき鋼板を製造する。さらに、この溶融亜鉛め
っき鋼板に合金化処理を施し、合金化溶融亜鉛めっき鋼
板を製造する。合金化処理は、常法に従って行なうが、
特に合金化温度４６０〜５５０℃の温度範囲で５〜３０
秒の加熱を条件とした合金化処理が望ましい。Next, the steel sheet thus treated is dipped in a hot dip galvanizing bath according to a conventional method and plated to produce a hot dip galvanized steel sheet. Further, this hot dip galvanized steel sheet is subjected to an alloying treatment to produce a hot dip galvanized steel sheet. The alloying treatment is performed according to a conventional method,
Especially in the temperature range of alloying temperature 460 to 550 ° C., 5 to 30
An alloying treatment under the condition of heating for 2 seconds is desirable.
【００２３】[0023]
【実施例】次に本発明を実施例によって更に具体的に説
明する。Ｃ：０．００２wt％、Ｓｉ：１．０wt％、Ｍ
ｎ：３．０wt％、Ｐ：０．１５wt％の化学成分を有する
鋼を溶製し、常法に従って熱間圧延および冷間圧延を行
なって板厚０．７ｍｍの鋼板を作製した。この冷延鋼板
に脱脂および塩酸を用いた活性化処理を施した後、鋼板
を陽極として表１に示す陽極電解処理条件で酸化膜を形
成した。その後、以下の（ａ）焼鈍条件、（ｂ）溶融亜
鉛めっき条件、（ｃ）合金化熱処理条件で処理を行な
い、これら鋼板を実施例１〜６とした。EXAMPLES Next, the present invention will be described more specifically by way of examples. C: 0.002 wt%, Si: 1.0 wt%, M
Steel having a chemical composition of n: 3.0 wt% and P: 0.15 wt% was melted and hot-rolled and cold-rolled according to a conventional method to produce a steel plate having a thickness of 0.7 mm. After degreasing and activation treatment using hydrochloric acid on this cold rolled steel sheet, an oxide film was formed under the anodic electrolytic treatment conditions shown in Table 1 using the steel sheet as an anode. Thereafter, the steel sheets were treated under the following (a) annealing conditions, (b) hot dip galvanizing conditions, and (c) alloying heat treatment conditions, and these steel sheets were made Examples 1 to 6.
【００２４】比較例として、上記実施例で用いたのと同
一組成の鋼板を陽極電解の処理のみを施さず溶融亜鉛め
っきした例（比較例１）、鉄よりも被酸化性の強い元素
を添加していないＣ：０．００２wt％、Ｓｉ：０．００
２wt％、Ｍｎ：０．２wt％、Ｐ：０．０１wt％の成分を
有する通常の極低炭素鋼板を、陽極電解の処理なしに溶
融亜鉛めっきした例（比較例２）および上記実施例で用
いたのと同一組成の鋼板を無酸化炉相当の雰囲気で酸化
したのち水素含有雰囲気で還元し、溶融亜鉛めっきした
例（比較例３）を示した。As a comparative example, an example in which a steel sheet having the same composition as that used in the above example is hot dip galvanized without being subjected to only anodic electrolysis treatment (Comparative Example 1), and an element which is more oxidizable than iron is added. Not done C: 0.002 wt%, Si: 0.00
Used in an example (comparative example 2) of hot dip galvanizing a normal ultra low carbon steel sheet having components of 2 wt%, Mn: 0.2 wt% and P: 0.01 wt% without anodic electrolysis treatment and the above-mentioned examples. An example (Comparative Example 3) in which a steel sheet having the same composition as that described above was subjected to hot dip galvanization after being oxidized in an atmosphere equivalent to an oxidation-free furnace and then reduced in an atmosphere containing hydrogen was shown.
【００２５】各鋼板を溶融亜鉛めっき後に外観目視検
査、めっき密着性試験を行ない、さらに合金化した後、
合金化度をみるためめっき層中のＦｅwt％を測定した。
評価方法は以下に示す通りである。After hot dip galvanizing each steel sheet, visual inspection and plating adhesion test were conducted, and after alloying,
Fewt% in the plating layer was measured to check the degree of alloying.
The evaluation method is as shown below.
【００２６】（ａ）焼鈍条件 昇温速度 ：１０℃／秒 加熱速度 ：８５０℃ 保持時間 ：３０秒 降温速度 ：２０℃／秒 炉内雰囲気：８５％Ｎ2 ＋１５％Ｈ2 （ｂ）溶融亜鉛めっき条件 浴 温：４７０℃ Ａｌ含有率：０．１５wt％ 付 着 量：６０ｇ／ｍ2 （片面） （ｃ）合金化熱処理条件 合金化温度：４８０℃ 合金化時間：２０秒(A) Annealing conditions Temperature rising rate: 10 ° C./second Heating rate: 850 ° C. Holding time: 30 seconds Temperature falling rate: 20 ° C./second Furnace atmosphere: 85% N 2 + 15% H 2 (b) Molten zinc Plating conditions Bath temperature: 470 ° C. Al content: 0.15 wt% Deposition amount: 60 g / m 2 (one side) (c) Alloying heat treatment conditions Alloying temperature: 480 ° C. Alloying time: 20 seconds
【００２７】［外 観］目視によるめっき外観検査の評
価基準は以下の通りである。 ○…不めっき部分なし ×…不めっき部分あり[Appearance] Evaluation criteria for visual inspection of plating are as follows. ○: No unplated part ×: Unplated part
【００２８】［めっき密着性試験］デュポン衝撃試験を
行なった。評価基準は以下の通りである。 ○…剥離なし ×…剥離あり[Plating Adhesion Test] A DuPont impact test was performed. The evaluation criteria are as follows. ○: No peeling ×: Peeling
【００２９】［Ｆｅwt％の測定］Ｆｅwt％はめっき層を
酸で溶解し、その液を化学分析する方法で測定を行なっ
た。[Measurement of Fewt%] Fewt% was measured by a method of dissolving the plating layer with an acid and chemically analyzing the solution.
【００３０】実施例１〜６、比較例１、２の実験結果を
表１に示す。この実験結果より、本発明は不めっきを発
生し易い、易酸化性元素を添加した鋼板においても、通
常の極低炭素鋼板と外観、めっき密着性において同程度
のめっきを形成することが示された。また、（プレめっ
き法や無酸化炉方式に比べ）、各鋼板の合金化度のバラ
ツキが小さいことが示された。Table 1 shows the experimental results of Examples 1 to 6 and Comparative Examples 1 and 2. From this experimental result, it is shown that the present invention forms a plating of the same degree in appearance and plating adhesion as a normal ultra-low carbon steel sheet, even in a steel sheet to which an oxidizable element is added, which easily causes non-plating. It was It was also shown that the variation in the alloying degree of each steel sheet was small (compared to the pre-plating method and the non-oxidizing furnace method).
【００３１】[0031]
【表１】 ＊（表１注）カソード還元測定条件 電解液 0.05N ホウ砂-0.1N 塩酸溶液(pH7.9) 電流密度 10μA/cm2 [Table 1] * (Table 1 Note) Cathode reduction measurement conditions Electrolyte 0.05N Borax-0.1N Hydrochloric acid solution (pH 7.9) Current density 10 μA / cm 2
【００３２】[0032]
【発明の効果】以上詳述してきたように、鋼板を高強度
化するために各種元素を添加することによって、溶融亜
鉛めっきが困難になっても、本発明法を適用すれば優れ
た特性を有する亜鉛系溶融めっき鋼板や合金化亜鉛めっ
き鋼板の安定製造が可能となる。特に自動車の軽量化に
不可欠の高強度合金化溶融亜鉛めっき鋼板が安定製造で
きることの意義は大きい。As described above in detail, even if hot dip galvanizing becomes difficult by adding various elements for enhancing the strength of the steel sheet, excellent characteristics can be obtained by applying the method of the present invention. It is possible to stably manufacture the zinc-based hot-dip galvanized steel sheet and the alloyed galvanized steel sheet. In particular, it is of great significance that the high-strength galvannealed steel sheet, which is essential for weight reduction of automobiles, can be stably manufactured.
Claims (2)
強度鋼板を溶融亜鉛めっきする方法において、陽極電解
処理により鋼板表面に酸化膜（酸化膜、水酸化膜、水和
酸化膜）を形成し、水素を含む雰囲気中で焼鈍した後、
溶融亜鉛めっきすることを特徴とする高強度鋼板の溶融
亜鉛めっき法。1. A method of hot-dip galvanizing a high-strength steel sheet to which an element that is more oxidizable than iron is added, and an oxide film (oxide film, hydroxide film, hydrated oxide film) is formed on the surface of the steel sheet by anodic electrolytic treatment. And after annealing in an atmosphere containing hydrogen,
A hot-dip galvanizing method for high-strength steel sheets, characterized by hot-dip galvanizing.
鋼板をさらに合金化処理する高強度鋼板の合金化溶融亜
鉛めっき法。2. A method for galvannealing a high-strength steel sheet, which comprises further alloying the hot-dip galvanized high-strength steel sheet obtained in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33851191A JPH05171392A (en) | 1991-12-20 | 1991-12-20 | Method for galvanizing high-strength steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33851191A JPH05171392A (en) | 1991-12-20 | 1991-12-20 | Method for galvanizing high-strength steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05171392A true JPH05171392A (en) | 1993-07-09 |
Family
ID=18318847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33851191A Withdrawn JPH05171392A (en) | 1991-12-20 | 1991-12-20 | Method for galvanizing high-strength steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05171392A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012091310A3 (en) * | 2010-12-28 | 2012-09-13 | Posco | Hot dip plated steel sheet having excellent plating adhesiveness and method of manufacturing the same |
| JP2016027208A (en) * | 2013-08-12 | 2016-02-18 | Ｊｆｅスチール株式会社 | Producing method for high-strength galvanized steel plate, and producing method for high-strength alloy molten galvanized steel plate |
| JP2019031721A (en) * | 2017-08-09 | 2019-02-28 | Ｊｆｅスチール株式会社 | Method for manufacturing high strength hot-dip galvanized steel sheet |
| WO2019154680A1 (en) * | 2018-02-06 | 2019-08-15 | Salzgitter Flachstahl Gmbh | Method for producing a steel strip with improved bonding of metallic hot-dip coatings |
-
1991
- 1991-12-20 JP JP33851191A patent/JPH05171392A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012091310A3 (en) * | 2010-12-28 | 2012-09-13 | Posco | Hot dip plated steel sheet having excellent plating adhesiveness and method of manufacturing the same |
| JP2016027208A (en) * | 2013-08-12 | 2016-02-18 | Ｊｆｅスチール株式会社 | Producing method for high-strength galvanized steel plate, and producing method for high-strength alloy molten galvanized steel plate |
| JP2019031721A (en) * | 2017-08-09 | 2019-02-28 | Ｊｆｅスチール株式会社 | Method for manufacturing high strength hot-dip galvanized steel sheet |
| WO2019154680A1 (en) * | 2018-02-06 | 2019-08-15 | Salzgitter Flachstahl Gmbh | Method for producing a steel strip with improved bonding of metallic hot-dip coatings |
| KR20200118079A (en) * | 2018-02-06 | 2020-10-14 | 잘쯔기터 플래시슈탈 게엠베하 | Method of making steel strip with improved adhesion of metal hot dip coating |
| US20210156018A1 (en) * | 2018-02-06 | 2021-05-27 | Salzgitter Flachstahl Gmbh | Method for producing a steel strip with improved bonding of metallic hot-dip coatings |
| RU2766611C1 (en) * | 2018-02-06 | 2022-03-15 | Зальцгиттер Флахшталь Гмбх | Method of producing a steel strip with improved adhesion of hot-dipped metal coatings |
| US11702729B2 (en) | 2018-02-06 | 2023-07-18 | Salzgitter Flachstahl Gmbh | Method for producing a steel strip with improved bonding of metallic hot-dip coatings |
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