JPH09143659A - Galvannealed steel sheet excellent in initial white rust resistance - Google Patents
Galvannealed steel sheet excellent in initial white rust resistanceInfo
- Publication number
- JPH09143659A JPH09143659A JP29714495A JP29714495A JPH09143659A JP H09143659 A JPH09143659 A JP H09143659A JP 29714495 A JP29714495 A JP 29714495A JP 29714495 A JP29714495 A JP 29714495A JP H09143659 A JPH09143659 A JP H09143659A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- white rust
- rust resistance
- plating layer
- weight
- 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.)
- Granted
Links
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- Other Surface Treatments For Metallic Materials (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は耐初期白錆性の優れ
た溶融Ｚｎ合金めっき鋼板に関するものである。TECHNICAL FIELD The present invention relates to a hot-dip Zn alloy-plated steel sheet excellent in initial white rust resistance.
【０００２】[0002]
【従来の技術】耐食性に優れた溶融Ｚｎ合金めっき鋼板
については従来より多くの提案がなされており、本発明
者らもすでに特開平４−１４７９５５号公報において加
工後の耐赤錆性が通常の溶融Ｚｎめっき鋼板よりも大幅
に優れたＺｎ−Ｍｇ−Ａｌめっき鋼板の製造方法を提案
している。2. Description of the Related Art Many proposals have been made for a hot-dip Zn alloy-plated steel sheet having excellent corrosion resistance, and the inventors of the present invention have already disclosed in JP-A-4-147955 that the red rust resistance after processing is the same as that of ordinary hot-melting. It proposes a method of manufacturing a Zn-Mg-Al plated steel sheet which is significantly superior to a Zn plated steel sheet.
【０００３】[0003]
【発明が解決しようとする課題】最近、建材、土木分野
においては、未塗装状態あるいは加工後に塗装を施した
溶融Ｚｎめっき鋼板が使用されるが、これらの鋼板はク
ロメート処理された状態あるいはクロメート無処理状態
でコイルあるいは切り板のままで一定期間、室外あるい
は倉庫等に保存された後にガードレール部材、デッキプ
レート等に加工されて使用される。最近、この保管中、
特に湿度の高い梅雨時等においては腐食初期に白錆が発
生することがあり、この耐白錆性の向上が新しい解決課
題となってきた。上記Ｚｎ−Ｍｇ−Ａｌめっき鋼板は、
耐食性の優れた鋼板であり、この腐食初期の耐白錆性に
おいても通常の溶融Ｚｎめっき鋼板に比較すれば優れて
いるが、未だ十分とはいえず、そのさらなる改良が必要
であった。そこで、本発明は、耐初期白錆性の優れた溶
融Ｚｎめっき鋼板の提供を目的とする。Recently, in the field of construction materials and civil engineering, unpainted or hot-dip galvanized steel sheets coated after working are used, but these steel sheets are in a chromate-treated state or without chromate treatment. The coil or the cut plate in the treated state is stored outdoors or in a warehouse for a certain period of time and then processed into a guard rail member, a deck plate or the like for use. Recently, during this storage,
White rust may be generated in the early stage of corrosion especially in the rainy season when the humidity is high, and improvement of the white rust resistance has become a new problem to be solved. The Zn-Mg-Al plated steel sheet is
Although it is a steel sheet having excellent corrosion resistance, the white rust resistance at the initial stage of corrosion is superior to that of a conventional hot-dip Zn-plated steel sheet, but it is not sufficient yet and further improvement is required. Therefore, an object of the present invention is to provide a hot-dip galvanized steel sheet having excellent initial white rust resistance.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、Ｚｎ−Ｍ
ｇ−Ａｌめっき鋼板のめっき層の成分および構造を詳細
に解析し、さらに添加金属を考慮することにより種々の
実験を重ね、上記課題である腐食初期の耐白錆性に優れ
た溶融Ｚｎめっき鋼板を開発すべく検討した。本発明者
らはまず、特開平４−１４７９５５号公報で提案したＺ
ｎ−Ｍｇ−Ａｌめっき層に種々の金属を微量に添加し、
塩水腐食試験（ＳＳＴ）での初期の白錆発生状況を調査
した。その結果、めっき層中にＮｉを微量添加すること
により、めっき層中のＭｇ，Ａｌの分布がより均一にな
り、クロメート処理なしでも腐食初期の耐白錆性が向上
することが判明した。また、クロメート処理材において
は、Ｚｎ−Ｍｇ−Ａｌめっき層中にＮｉを含有すること
により耐白錆性への効果がますます顕著になることもわ
かった。その後Ｎｉを含めた最適組成を詳細に調査した
結果、本発明のＺｎ合金めっき鋼板を見いだすに至り、
下記の本発明を完成したものである。The present inventors have found that Zn-M
The composition and structure of the plating layer of the g-Al plated steel sheet are analyzed in detail, various experiments are repeated by considering the added metal, and the hot-dip galvanized steel sheet excellent in white rust resistance at the initial stage of corrosion, which is the above-mentioned problem I considered to develop. The present inventors firstly proposed the Z proposed in JP-A-4-147955.
Adding a small amount of various metals to the n-Mg-Al plating layer,
The initial occurrence of white rust in the salt water corrosion test (SST) was investigated. As a result, it was found that by adding a trace amount of Ni to the plating layer, the distribution of Mg and Al in the plating layer became more uniform, and the white rust resistance at the initial stage of corrosion was improved even without chromate treatment. It was also found that in the chromate-treated material, the effect on white rust resistance becomes more remarkable by including Ni in the Zn-Mg-Al plating layer. After that, as a result of detailed investigation of the optimum composition including Ni, the Zn alloy plated steel sheet of the present invention was found,
The present invention described below has been completed.
【０００５】即ち、本発明は、鋼板の表面にＭｇ０．０
５〜３重量％，Ａｌ０．１〜１重量％，Ｎｉ０．０１〜
０．２重量％，残部がＺｎおよび不可避的不純物よりな
るＺｎ合金めっき層を有することを特徴とする耐初期白
錆性の優れた溶融Ｚｎ合金めっき鋼板、および上記のＺ
ｎ合金めっき層の下層にＮｉめっき層を有することを特
徴とする耐初期白錆性の優れた溶融Ｚｎ合金めっき鋼
板、さらには、これらの溶融めっき層上にクロメート処
理を行った鋼板である。That is, according to the present invention, Mg0.0
5-3% by weight, Al 0.1-1% by weight, Ni 0.01-
A hot-dip Zn alloy-plated steel sheet having excellent initial white rust resistance, characterized by having a Zn alloy plating layer of 0.2% by weight, the balance being Zn and unavoidable impurities, and the above Z.
A hot-dip Zn alloy-plated steel sheet excellent in initial white rust resistance characterized by having a Ni-plated layer under the n-alloy plated layer, and further a steel sheet obtained by performing chromate treatment on these hot-dip plated layers.
【０００６】[0006]
【発明の実施の形態】以下、図面を用いて本発明につい
て詳細に説明する。図１は、Ｍｇ０．５重量％、Ａｌ
０．２５重量％を含有する付着量１３５ｇ／ｍ 2 のＺｎ
−Ｍｇ−Ａｌめっき鋼板において、めっき層中のＮｉ含
有量と耐白錆性との関係を示した図である。クロメート
処理なしの場合、クロメート処理あり（２０ｍｇ／ｍ
2 ）の場合共に示した。初期白錆性の試験方法としては
ＪＩＳに準拠した２００ｈｒの塩水噴霧試験（ＳＳＴ）
を用いた。３５℃、５％ＮａＣｌ溶液を用いた。評価基
準は次の通りで、評点３以上を合格とした。比較のため
に通常の溶融Ｚｎめっき鋼板（Ａｌ０．２５％）も評価
した。DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings.
This will be described in detail. FIG. 1 shows that 0.5% by weight of Mg and Al
Deposition amount of 135 g / m containing 0.25% by weight Two Zn
-In a Mg-Al plated steel sheet, the Ni content in the plating layer is
It is a figure showing the relation between abundance and white rust resistance. Chromate
Without treatment, with chromate treatment (20 mg / m
Two ). As a test method of initial white rust property
200hr salt spray test (SST) according to JIS
Was used. A 35% 5% NaCl solution was used. Evaluation base
The criteria are as follows, and a score of 3 or more is considered as passing. For comparison
Also evaluates ordinary hot-dip Zn coated steel sheet (Al0.25%)
did.
【０００７】初期白錆性の評点 評点 ５：白錆５％未満 ４：白錆５％以上２０％未満 ３：白錆２０％以上５０％未満 ２：白錆５０％以上白錆８０％未満 １：白錆８０％以上Rating of initial white rust property Rating 5: White rust less than 5% 4: White rust 5% to less than 20% 3: White rust 20% to less than 50% 2: White rust 50% to less than 80% 1 : White rust 80% or more
【０００８】Ｚｎ−Ｍｇ−Ａｌめっき鋼板は、通常のＺ
ｎ−Ａｌめっき鋼板よりも耐白錆性が優れる。それに対
してＺｎ−Ｍｇ−Ａｌめっき鋼板にＮｉを添加してゆく
とめっき層中のＮｉが０．０１〜０．２重量％の範囲で
耐白錆性がＺｎ−Ｍｇ−Ａｌめっき鋼板よりも著しく向
上する。クロメート処理した場合にもその効果は一段と
顕著である。Ｎｉ添加により初期白錆の発生が抑制され
る理由は、未だ明確ではないが、Ｚｎ−Ｍｇ−Ａｌめっ
き層にＮｉが適正量含有されることにより、めっき層中
のＭｇ，Ａｌの分布が均一化することにより、めっき層
自身の耐食性が向上するためと推定される。めっき層中
Ｎｉ含有量が０．０１重量％未満では耐白錆性が劣化す
る。また、Ｎｉが０．２重量％を越えると耐白錆性がむ
しろ劣化することもわかった。これは、電気化学的に貴
なＮｉが増加しすぎるとＺｎとの局部電池を構成しやす
くなり腐食が生じやすくなるものと思われる。Zn-Mg-Al plated steel sheet is a conventional Z
Better white rust resistance than n-Al plated steel sheet. On the other hand, when Ni is added to the Zn-Mg-Al plated steel sheet, the white rust resistance is better than that of the Zn-Mg-Al plated steel sheet in the range of 0.01 to 0.2% by weight of Ni in the plating layer. Remarkably improved. The effect is more remarkable when chromate treatment is applied. The reason why the generation of initial white rust is suppressed by the addition of Ni is not clear yet, but since the Zn-Mg-Al plating layer contains a proper amount of Ni, the distribution of Mg and Al in the plating layer is uniform. It is presumed that the corrosion resistance of the plating layer itself is improved by this conversion. If the Ni content in the plating layer is less than 0.01% by weight, the white rust resistance deteriorates. It was also found that white rust resistance rather deteriorates when Ni exceeds 0.2% by weight. It is considered that if the amount of electrochemically noble Ni increases too much, a local battery with Zn is likely to be formed and corrosion is likely to occur.
【０００９】本発明のＺｎ−Ｍｇ−Ａｌ−Ｎｉ系めっき
層中では、Ｍｇの含有量は０．０５％〜３重量％、Ａｌ
の含有量は０．１〜１重量％とした。めっき層中のＭｇ
含有量の下限を０．０５重量％としたのは、平板および
加工部の耐食性に効果を発揮するためである。上限を３
重量％としたのはこれを超えるとめっき層が硬くしかも
脆くなりすぎるためにめっき密着性が劣化するためであ
る。また、めっき層中のＡｌ含有量の下限を０．１重量
％としたのは、めっき密着性が良好となるためである。
また、上限を１重量％としたのは、１重量％を超えると
加工部の耐食性が劣化するためである。めっき層中に
は、これらの他にＦｅ，Ｓｂ，Ｐｂを単独あるいは複合
で１重量％以内含有しても本発明の効果は維持される。In the Zn-Mg-Al-Ni system plating layer of the present invention, the content of Mg is 0.05% to 3% by weight,
Was 0.1 to 1% by weight. Mg in plating layer
The lower limit of the content is set to 0.05% by weight in order to exert an effect on the corrosion resistance of the flat plate and the processed part. Up to 3
The reason why the content is set to% by weight is that if the content exceeds this range, the plating layer becomes too hard and too brittle, and the plating adhesion is deteriorated. The lower limit of the Al content in the plating layer is set to 0.1% by weight because the plating adhesion is good.
Further, the upper limit is set to 1% by weight because if it exceeds 1% by weight, the corrosion resistance of the processed portion is deteriorated. The effect of the present invention is maintained even if Fe, Sb, and Pb are contained in the plating layer in an amount of 1 wt% or less in addition to these.
【００１０】Ｚｎ−Ｍｇ−Ａｌ−Ｎｉ系めっきの付着量
については特に制約は設けないが、耐食性の観点から１
０ｇ／ｍ2 以上、加工性の観点からすると３５０ｇ／ｍ
2 以下であることが望ましい。本発明においては、さら
に加工部の耐食性を向上させる場合にはＺｎ−Ｍｇ−Ａ
ｌ−Ｎｉ系めっき層の下層にＮｉめっき層を設ける。こ
のプレＮｉめっき量は２ｇ／ｍ2 以下が好ましい。２ｇ
／ｍ2 を超えるとめっき密着性が劣化する。Ｎｉめっき
量の下限は０．２ｇ／ｍ2 が好ましい。めっき層下層に
Ｎｉめっき層を有する場合に加工部の耐食性が良好とな
る理由はめっき層−地鉄界面に生成したＮｉ−Ａｌ−Ｆ
ｅ−Ｚｎ化合物相が１種のバインダーの役割を果たすこ
とによるものと推定される。The Zn-Mg-Al-Ni-based coating amount is not particularly limited, but it is 1 from the viewpoint of corrosion resistance.
0 g / m 2 or more, 350 g / m from the viewpoint of workability
It is desirable to be 2 or less. In the present invention, Zn-Mg-A is used to further improve the corrosion resistance of the processed part.
A Ni plating layer is provided below the l-Ni-based plating layer. The pre-Ni plating amount is preferably 2 g / m 2 or less. 2g
If it exceeds / m 2 , the plating adhesion will deteriorate. The lower limit of the Ni plating amount is preferably 0.2 g / m 2 . The reason why the corrosion resistance of the processed portion is good when the Ni plating layer is provided below the plating layer is that Ni-Al-F formed at the plating layer-base iron interface.
It is presumed that the e-Zn compound phase plays a role of one kind of binder.
【００１１】さらに耐初期白錆性を向上させる場合に
は、Ｚｎ−Ｍｇ−Ａｌ−Ｎｉ系めっき層の上層にクロメ
ート層を設ける。クロメート処理層の組成、付着量につ
いても特に制約は設けないが、通常の実用範囲である１
０〜５０ｍｇ／ｍ2 程度が望ましい。上層にクロメート
処理層を設けるとＺｎ−Ｍｇ−Ａｌ−Ｎｉめっき層の耐
白錆性が特に向上するのは、めっき層中のＭｇおよびＮ
ｉがクロメート皮膜中に微量に取り込まれ、より高耐食
性の皮膜が形成されるものと推定される。なお、本発明
の下地鋼板としては、熱延鋼板、冷延鋼板共に使用で
き、鋼種もＡｌキルド鋼、Ｔｉ，Ｎｂ等を添加した極低
炭素鋼板、およびこれらにＰ、Ｓｉ、Ｍｎ等の強化元素
を添加した高強度鋼等種々のものが適用できる。In order to further improve the initial white rust resistance, a chromate layer is provided on the Zn-Mg-Al-Ni system plating layer. There is no particular restriction on the composition and the amount of the chromate-treated layer, but it is within the normal practical range.
About 0 to 50 mg / m 2 is desirable. The white rust resistance of the Zn-Mg-Al-Ni plated layer is particularly improved by providing the chromate-treated layer on the upper side because Mg and N in the plated layer are improved.
It is presumed that a small amount of i is incorporated into the chromate film to form a film with higher corrosion resistance. As the base steel sheet of the present invention, both hot-rolled steel sheet and cold-rolled steel sheet can be used, and the type of steel is an ultra-low carbon steel sheet in which Al-killed steel, Ti, Nb, etc. are added, and P, Si, Mn, etc. are reinforced. Various materials such as high strength steel to which an element is added can be applied.
【００１２】次に、本発明のめっき鋼板の製造方法につ
いては特に限定するところはなく、例えば浴中にＮｉを
添加し、通常の無酸化炉方式の溶融めっき法が適用でき
る。通常の合金化炉を用いてめっき後、合金化処理を施
しても良い。下層としてＮｉプレめっきを施す場合も通
常行われているプレめっき方法を適用すればよく、前述
したようにプレＮｉめっき量を０．２〜２ｇ／ｍ2 施し
たのち無酸化あるいは還元雰囲気中で急速低温加熱を行
い、そののちに溶融めっきを行う方法等が好ましい。ま
た、クロメート処理層を上層に施す方法も常法に従えば
よい。Next, the method for producing the plated steel sheet of the present invention is not particularly limited, and, for example, Ni can be added to the bath, and the usual non-oxidizing furnace hot dip coating method can be applied. The alloying treatment may be performed after plating using an ordinary alloying furnace. When Ni pre-plating is performed as the lower layer, a commonly used pre-plating method may be applied. As described above, after applying the pre-Ni plating amount of 0.2 to 2 g / m 2 in the non-oxidizing or reducing atmosphere. A method in which rapid low temperature heating is performed and then hot dipping is performed is preferable. Further, the method of applying the chromate-treated layer to the upper layer may be a conventional method.
【００１３】[0013]
【実施例】Ａｌキルド熱延鋼板（板厚１．６ｍｍ）を下
地に、４５０℃の浴中のＮｉ量を変化させたＺｎ−Ｍｇ
−Ａｌ−Ｎｉめっき浴で３ｓ溶融めっきを行い、Ｎ2 ワ
イピングでめっき付着量を１３５ｇ／ｍ2 に調整した。
得られためっき鋼板のめっき層中組成を表１に示す。な
お、一部の試料については、下層にＮｉプレめっき層、
または上層に２０ｍｇ／ｍ2 のクロメート処理層を施し
た。これらのめっき鋼板について、前述の耐白錆性の評
価および張りだし加工部の耐食性評価を行った。[Example] Zn-Mg obtained by changing the amount of Ni in a 450 ° C bath on the basis of an Al-killed hot-rolled steel sheet (sheet thickness: 1.6 mm)
-Al-Ni plating bath was used for 3 s hot-dip plating, and the coating weight was adjusted to 135 g / m 2 with N 2 wiping.
The composition of the plated layer of the obtained plated steel sheet is shown in Table 1. In addition, for some samples, a Ni pre-plated layer was formed as the lower layer,
Alternatively, a 20 mg / m 2 chromate-treated layer was applied to the upper layer. For these plated steel sheets, the white rust resistance and the corrosion resistance of the overhanging portion were evaluated.
【００１４】（１）耐白錆性評価 前述したＪＩＳに準拠したＳＳＴ試験を行い、白錆の発
生率を評点付けした。評点は前述の通り。 （２）加工部耐食性 球頭ポンチ径１０ｍｍで高さ１０ｍｍの円筒を成形し、
ＳＳＴ６ｈｒ→乾燥３ｈｒ→湿潤１４ｈｒ→乾燥１ｈｒ
を１サイクルとして６０サイクルのＣＣＴテストを行っ
た。そして耐食性は、赤錆発生状況を以下に示す評点づ
けで判定した。評点３以上を合格とした。 ５：５％未満 ４：５％以上１０％未満 ３：１０％以上２０％未満 ２：２０％以上３０％未満 １：３０％以上 以上の評価結果を表１に示す。(1) Evaluation of white rust resistance The SST test according to the above-mentioned JIS was conducted to rate the white rust occurrence rate. The score is as described above. (2) Corrosion resistance of processed part A cylinder with a ball head punch diameter of 10 mm and a height of 10 mm is formed,
SST 6hr → Dry 3hr → Wet 14hr → Dry 1hr
60 cycles of CCT test. Then, the corrosion resistance was judged by rating the occurrence of red rust as follows. A rating of 3 or higher was passed. 5: less than 5% 4: 5% or more and less than 10% 3: 10% or more and less than 20% 2: 20% or more and less than 30% 1: 30% or more The above evaluation results are shown in Table 1.
【００１５】[0015]
【表１】 [Table 1]
【００１６】本発明のめっき層組成よりなるめっき鋼板
は、耐初期白錆性が優れ、併せて加工部の耐食性にも優
れている。これに対して、めっき層組成が本発明の範囲
を逸脱する比較例は、本発明鋼板に比較して耐初期白錆
性および加工部の耐食性が劣る。The plated steel sheet having the composition of the plating layer of the present invention has excellent initial white rust resistance and, at the same time, excellent corrosion resistance in the processed part. On the other hand, in the comparative example in which the composition of the plating layer deviates from the range of the present invention, the initial white rust resistance and the corrosion resistance of the processed part are inferior to the steel sheet of the present invention.
【００１７】[0017]
【発明の効果】本発明のＺｎ−Ｍｇ−Ａｌ−Ｎｉ系合金
めっき鋼板は、めっき層中に適量のＮｉを含有させるこ
とによって耐白錆性が著しく向上し、加工部の耐食性に
も優れ、建材、土木、車体等の用途に有用である。The Zn-Mg-Al-Ni alloy-plated steel sheet of the present invention has a significantly improved white rust resistance and an excellent corrosion resistance in the processed part by containing an appropriate amount of Ni in the plating layer. It is useful for building materials, civil engineering, car bodies, etc.
【図１】Ｚｎ−Ｍｇ−Ａｌ−Ｎｉめっき層中のＮｉ含有
量と耐食性の関係を示した図である。FIG. 1 is a diagram showing a relationship between a Ni content in a Zn—Mg—Al—Ni plated layer and corrosion resistance.
Claims (3)
％，Ａｌ０．１〜１重量％，Ｎｉ０．０１〜０．２重量
％、残部がＺｎおよび不可避的不純物よりなるＺｎ合金
めっき層を有することを特徴とする耐初期白錆性の優れ
た溶融Ｚｎ合金めっき鋼板。1. A Zn alloy plating layer comprising Mg 0.05 to 3% by weight, Al 0.1 to 1% by weight, Ni 0.01 to 0.2% by weight, and the balance Zn and unavoidable impurities on the surface of a steel sheet. A hot-dip Zn alloy plated steel sheet having excellent initial white rust resistance, which is characterized by having.
にＮｉめっき層を有することを特徴とする耐初期白錆性
の優れた溶融Ｚｎ合金めっき鋼板。2. A hot-dip Zn alloy-plated steel sheet having excellent initial white rust resistance, which has a Ni plating layer under the Zn alloy plating layer according to claim 1.
層の上層にクロメート層を設けることを特徴とする耐初
期白錆性の優れた溶融Ｚｎ合金めっき鋼板。3. A hot-dip Zn alloy-plated steel sheet having excellent initial white rust resistance, comprising a chromate layer on the hot-dip Zn-plated layer according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07297144A JP3073679B2 (en) | 1995-11-15 | 1995-11-15 | Hot-dip Zn alloy coated steel sheet with excellent initial white rust resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07297144A JP3073679B2 (en) | 1995-11-15 | 1995-11-15 | Hot-dip Zn alloy coated steel sheet with excellent initial white rust resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09143659A true JPH09143659A (en) | 1997-06-03 |
| JP3073679B2 JP3073679B2 (en) | 2000-08-07 |
Family
ID=17842782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07297144A Expired - Fee Related JP3073679B2 (en) | 1995-11-15 | 1995-11-15 | Hot-dip Zn alloy coated steel sheet with excellent initial white rust resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3073679B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004079032A1 (en) * | 2003-03-07 | 2004-09-16 | N.V. Bekaert S.A. | Zinc-nickel coating layer |
| JP2006299339A (en) * | 2005-04-20 | 2006-11-02 | Nippon Steel Corp | Hot-dip galvanizing method without causing unplated defect |
| JP2012251247A (en) * | 2012-08-14 | 2012-12-20 | Jfe Galvanizing & Coating Co Ltd | Method for producing resin-coated steel sheet |
| JP2012251246A (en) * | 2006-11-10 | 2012-12-20 | Jfe Galvanizing & Coating Co Ltd | HOT DIP Zn-Al BASED ALLOY PLATED STEEL SHEET |
-
1995
- 1995-11-15 JP JP07297144A patent/JP3073679B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004079032A1 (en) * | 2003-03-07 | 2004-09-16 | N.V. Bekaert S.A. | Zinc-nickel coating layer |
| JP2006299339A (en) * | 2005-04-20 | 2006-11-02 | Nippon Steel Corp | Hot-dip galvanizing method without causing unplated defect |
| JP4582707B2 (en) * | 2005-04-20 | 2010-11-17 | 新日本製鐵株式会社 | Hot-dip galvanizing method without generation of non-plating defects |
| JP2012251246A (en) * | 2006-11-10 | 2012-12-20 | Jfe Galvanizing & Coating Co Ltd | HOT DIP Zn-Al BASED ALLOY PLATED STEEL SHEET |
| JP2012251247A (en) * | 2012-08-14 | 2012-12-20 | Jfe Galvanizing & Coating Co Ltd | Method for producing resin-coated steel sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3073679B2 (en) | 2000-08-07 |
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