JPH05222572A - Electrogalvanized steel sheet having two plated layer and excellent in blackening resistance - Google Patents
Electrogalvanized steel sheet having two plated layer and excellent in blackening resistanceInfo
- Publication number
- JPH05222572A JPH05222572A JP4059439A JP5943992A JPH05222572A JP H05222572 A JPH05222572 A JP H05222572A JP 4059439 A JP4059439 A JP 4059439A JP 5943992 A JP5943992 A JP 5943992A JP H05222572 A JPH05222572 A JP H05222572A
- Authority
- JP
- Japan
- Prior art keywords
- electrogalvanized
- layer
- steel sheet
- plating
- lead content
- 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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- Electroplating Methods And Accessories (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、耐黒変性に優れた電
気亜鉛めっき鋼板に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrogalvanized steel sheet excellent in blackening resistance.
【０００２】[0002]
【従来の技術】電気亜鉛めっき鋼板を無塗装で使用する
場合には、電気亜鉛めっき層の上に、クロメート処理に
よってクロメート被膜を形成することが行われている。
このようなクロメート被膜の形成によって、電気亜鉛め
っき鋼板の耐食性は大きく向上する。しかしながら、最
近、クロメート処理電気亜鉛めっき鋼板に対する需要が
増大するに伴い、クロメート電気亜鉛電気めっき鋼板の
特性に対する需要家の要求項目が増加し、耐食性はもと
より、耐黒変性のような外観上の特性が重視されるよう
になってきた。2. Description of the Related Art When an electrogalvanized steel sheet is used without coating, a chromate film is formed on the electrogalvanized layer by a chromate treatment.
The formation of such a chromate coating greatly improves the corrosion resistance of the electrogalvanized steel sheet. However, recently, as the demand for chromate-treated electrogalvanized steel sheet has increased, the requirements of customers for the characteristics of chromated electrogalvanized electroplated steel sheet have increased, and not only corrosion resistance but also appearance characteristics such as blackening resistance. Is becoming more important.
【０００３】クロメート処理電気亜鉛めっき鋼板を積み
重ねた状態で貯蔵しておくと、その表面の一部または全
部が灰黒色に変色する、いわゆる黒変現象が生ずること
があり、商品価値が著しく低下する。このような電気亜
鉛めっき鋼板に発生する黒変現象の原因は、必ずしも明
らかではないが、電気亜鉛めっき層表面の腐食によるも
のと思われ、特に、電気亜鉛めっき層中の鉛（Pb) が、
黒変を促進するといわれている。When the chromate-treated electrogalvanized steel sheets are stored in a stacked state, a so-called black discoloration phenomenon may occur in which a part or the whole of the surface thereof is discolored to gray black, resulting in a marked decrease in commercial value. .. The cause of the blackening phenomenon that occurs in such an electrogalvanized steel sheet is not necessarily clear, but it is thought to be due to corrosion of the surface of the electrogalvanized layer. In particular, lead (Pb) in the electrogalvanized layer is
It is said to promote blackening.
【０００４】このような電気亜鉛めっき鋼板の黒変を防
止する方法として、特公昭62-45308号には、電気亜鉛め
っき浴中に存在する、不純物としての鉛の含有量を0.2p
pm以下にすることによって、耐黒変性を向上させる方法
が開示されている（以下、先行技術という）。更に、先
行技術には、電気亜鉛めっき浴中に、炭酸ストロンチウ
ムまたは亜鉛粒を添加し、硫酸ストロンチウムの沈澱と
鉛化合物との共沈現象、または、亜鉛粒上への鉛の置換
析出現象を利用して、電気亜鉛めっき浴中の鉛含有量を
0.2ppm以下に低減することが示されている。As a method for preventing such blackening of the electrogalvanized steel sheet, Japanese Patent Publication No. 62-45308 discloses that the content of lead as an impurity in the electrogalvanizing bath is 0.2 p
A method of improving the blackening resistance by setting it to be pm or less is disclosed (hereinafter referred to as prior art). Furthermore, in the prior art, by adding strontium carbonate or zinc particles to the electrogalvanizing bath, the precipitation phenomenon of strontium sulfate and the co-precipitation of lead compounds, or the substitution precipitation phenomenon of lead on the zinc particles is used. The lead content in the electrogalvanizing bath
It has been shown to be reduced to 0.2 ppm or less.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、先行技
術によっては、クロメート処理電気亜鉛めっき鋼板の黒
変を防止することは困難である。その理由は、次の通り
である。本発明者等は、電気亜鉛めっき鋼板の耐黒変性
と、電気亜鉛めっき浴中の鉛含有量との相関性について
調べた。周知のように、電気亜鉛めっき層中における、
鉛等の不純物の含有量は、電気亜鉛めっき浴の成分およ
びめっき条件によって大きく左右される。即ち、電気亜
鉛めっき層中の鉛含有量は、電気亜鉛めっき浴の成分組
成、pH値、温度、めっき電流密度、めっき液の流動状態
によって大きく変化する。従って、電気亜鉛めっき浴中
の鉛含有量を0.2ppm以下にした場合でも、耐黒変性に劣
る場合が生じ、先行技術によっては、電気亜鉛めっき鋼
板の黒変を完全に防止することは不可能である。However, according to the prior art, it is difficult to prevent blackening of the chromate-treated electrogalvanized steel sheet. The reason is as follows. The present inventors investigated the correlation between the blackening resistance of the electrogalvanized steel sheet and the lead content in the electrogalvanizing bath. As is well known, in the electrogalvanized layer,
The content of impurities such as lead greatly depends on the components of the electrogalvanizing bath and the plating conditions. That is, the lead content in the electrogalvanized layer largely changes depending on the component composition of the electrogalvanized bath, the pH value, the temperature, the plating current density, and the flow state of the plating solution. Therefore, even if the lead content in the electrogalvanizing bath is 0.2 ppm or less, the blackening resistance may be poor, and it is impossible to completely prevent the blackening of the electrogalvanized steel sheet by the prior art. Is.
【０００６】更に、先行技術によれば、電気亜鉛めっき
浴中の鉛含有量を0.2ppm以下に低減するために、炭酸ス
トロンチムの添加装置および置換反応槽等の設備、なら
びに、除去生成物の分離装置を必要とし、更に、比確的
高価な炭酸ストロンチウムを多量に消費する。従って、
電気亜鉛めっき鋼板の製造コストの上昇が避けられな
い。Further, according to the prior art, in order to reduce the lead content in the electrogalvanizing bath to 0.2 ppm or less, equipment such as a strontium carbonate addition device and a substitution reaction tank, and separation of removed products It requires a device and consumes a large amount of strontium carbonate, which is relatively expensive. Therefore,
Increasing manufacturing cost of electrogalvanized steel sheets is inevitable.
【０００７】従って、この発明の目的は、上述した問題
を解決し、いかなる条件下で製造しても黒変が発生する
ことがない、耐黒変性に優れ、且つ、製造コストの上昇
を伴わず経済的に製造し得る電気亜鉛めっき鋼板を提供
することにある。Therefore, an object of the present invention is to solve the above-mentioned problems, to prevent black discoloration under any condition, to be excellent in blackening resistance, and to avoid an increase in manufacturing cost. An object is to provide an electrogalvanized steel sheet that can be economically manufactured.
【０００８】[0008]
【課題を解決するための手段】本発明者等は、上述した
問題を解決すべく鋭意研究を重ねた。その結果、次の知
見を得た。即ち、電気亜鉛めっき鋼板に生ずる黒変は、
電気亜鉛めっき層中の鉛含有量に依存し、電気亜鉛めっ
き層中の鉛含有量を、10ppm 以下に規制すれば、いかな
る条件下で製造しても黒変が発生することはない。電気
亜鉛めっき層中の鉛含有量は、めっき浴中の鉛含有量の
みによって決まるものではなく、めっき電流密度、めっ
き液の流速、pH値およびめっき浴の成分組成等によって
決まる。従って、めっき浴中の鉛含有量をそれほど低減
させなくても、めっき条件によっては、めっき層中の鉛
含有量を、10ppm 以下に規制することができる。そし
て、電気亜鉛めっき鋼板に生ずる黒変は、電気亜鉛めっ
き層の表層の腐食現象によるものと思われるから、電気
亜鉛めっき層表層の鉛含有量を上記範囲に規制すれば、
電気亜鉛めっき鋼板の耐黒変性を改善し得る。Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above-mentioned problems. As a result, the following findings were obtained. That is, the black discoloration that occurs on the electrogalvanized steel sheet is
Depending on the lead content in the electrogalvanized layer, if the lead content in the electrogalvanized layer is regulated to 10 ppm or less, blackening does not occur under any conditions. The lead content in the electrogalvanized layer is determined not only by the lead content in the plating bath, but by the plating current density, the flow rate of the plating solution, the pH value, the composition of the plating bath, and the like. Therefore, even if the lead content in the plating bath is not reduced so much, the lead content in the plating layer can be restricted to 10 ppm or less depending on the plating conditions. And, the blackening that occurs in the electrogalvanized steel sheet is considered to be due to the corrosion phenomenon of the surface layer of the electrogalvanized layer, so if the lead content of the electrogalvanized layer surface layer is regulated within the above range,
The blackening resistance of the electrogalvanized steel sheet can be improved.
【０００９】この発明は、上記知見に基づいてなされた
ものであって、この発明の２つのめっき層を有する電気
亜鉛めっき鋼板は、鋼板の少なくとも１つの表面上に形
成された、下層としての電気亜鉛めっき層と、前記下層
としての電気亜鉛めっき層の上に形成された、鉛含有量
が10ppm 以下であり、そして、めっき量が0.5 から５g/
m2の範囲内である、上層としての電気亜鉛めっき層とか
らなることに特徴を有するものである。The present invention has been made based on the above findings, and an electrogalvanized steel sheet having two plating layers of the present invention is an electric galvanized steel sheet formed on at least one surface of a steel sheet as an underlayer. The lead content formed on the galvanizing layer and the electrogalvanizing layer as the lower layer is 10 ppm or less, and the plating amount is 0.5 to 5 g /
It is characterized in that it comprises an electrogalvanized layer as an upper layer, which is in the range of m 2 .
【００１０】[0010]
【作用】この発明においては、上層電気亜鉛めっき層中
の鉛含有量を、10ppm 以下に限定することが必要であ
る。このように、上層電気亜鉛めっき層中の鉛含有量
を、10ppm 以下に限定することにより、電気亜鉛めっき
浴の成分組成、電気亜鉛めっき条件およびクロメート処
理条件にかかわらず、耐黒変性に優れた電気亜鉛めっき
鋼板が得られる。なお、電気亜鉛めっき層中の鉛含有量
を、10ppm 以下にするためには、電気亜鉛めっき浴中の
鉛含有量を低減し、そして、電気亜鉛めっき層中に鉛が
析出しにくい条件でめっきすることが必要である。In the present invention, it is necessary to limit the lead content in the upper electrogalvanized layer to 10 ppm or less. Thus, by limiting the lead content in the upper electrogalvanized layer to 10 ppm or less, excellent blackening resistance was obtained regardless of the composition of the electrogalvanizing bath, electrogalvanizing conditions and chromate treatment conditions. An electrogalvanized steel sheet is obtained. In addition, in order to reduce the lead content in the electrogalvanized layer to 10 ppm or less, the lead content in the electrogalvanized bath should be reduced, and plating should be performed under the conditions that lead is not likely to precipitate in the electrogalvanized layer. It is necessary to.
【００１１】更に、この発明においては、上層電気亜鉛
めっき層のめっき量を、0.5 から５g/m2の範囲内に限定
することが必要である。めっき量が0.5 g/m2未満では、
上層電気亜鉛めっき層によって、下層電気亜鉛めっき層
を十分に被覆することができず、黒変防止効果が不十分
になる。一方、めっき量が５g/m2を超えても、より以上
の効果は得られない。しかも、電気亜鉛めっき層中の鉛
含有量を10ppm 以下にするためには、上述したように、
電気亜鉛めっき層中に鉛が析出しにくい条件でめっきす
ることが必要であるので、めっき量が５g/m2を超える
と、上述しためっき処理のために、電気亜鉛めっき鋼板
の製造コストが上昇する問題が生ずる。Further, in the present invention, it is necessary to limit the plating amount of the upper electrogalvanized layer to within the range of 0.5 to 5 g / m 2 . If the plating amount is less than 0.5 g / m 2 ,
The upper electrogalvanized layer cannot sufficiently cover the lower electrogalvanized layer, resulting in insufficient blackening prevention effect. On the other hand, even if the plating amount exceeds 5 g / m 2 , no further effect can be obtained. Moreover, in order to reduce the lead content in the electrogalvanized layer to 10 ppm or less, as described above,
Since it is necessary to plate under conditions in which lead is unlikely to precipitate in the electrogalvanized layer, if the plating amount exceeds 5 g / m 2 , the manufacturing cost of electrogalvanized steel sheets increases due to the above-mentioned plating treatment. Problem arises.
【００１２】上述したように、この発明においては、上
層および下層の２層からなる電気亜鉛めっき層の、上層
電気亜鉛めっき層における鉛含有量を10ppm 以下に限定
し、そして、上層電気亜鉛めっき層のめっき量を、0.5
から５g/m2の範囲内に限定した。このように、上層電気
亜鉛めっき層を薄目付け量にしたことにより、上層電気
亜鉛めっき層の鉛含有量を低減するための、例えば炭酸
ストロンチウムの消費量を低減することができる。勿
論、下層電気亜鉛めっき層の鉛含有量を低減する必要は
なく、従って、下層電気亜鉛めっき層を形成するための
電気めっき浴中に、その鉛含有量を低減するための炭酸
ストロンチウムを添加することは不要である。上述した
ことから、この発明によれば、低コストで、耐黒変性に
優れた電気亜鉛めっき鋼板を製造することができる。As described above, in the present invention, the lead content of the upper electrogalvanized layer of the electrogalvanized layer consisting of the upper layer and the lower layer is limited to 10 ppm or less, and the upper electrogalvanized layer. Plating amount of 0.5
It is limited to the range of 5 g / m 2 from. In this way, by making the upper electrogalvanized layer a light weight, it is possible to reduce the consumption amount of, for example, strontium carbonate for reducing the lead content of the upper electrogalvanized layer. Of course, it is not necessary to reduce the lead content of the lower electrogalvanized layer, and therefore, strontium carbonate for reducing the lead content is added to the electroplating bath for forming the lower electrogalvanized layer. Is unnecessary. From the above, according to the present invention, it is possible to manufacture an electrogalvanized steel sheet excellent in blackening resistance at low cost.
【００１３】下層電気亜鉛めっき層のめっき量は、特に
限定されるものではないが、５から４０g/m2の範囲内が
好ましい。下層電気亜鉛めっき層のめっき量が５g/m2未
満では、耐食性が劣化するおそれが生ずる。一方、下層
電気亜鉛めっき層のめっき量が40g/m2を超えると、プレ
ス成形性が劣化するおそれが生ずる。The plating amount of the lower electrogalvanized layer is not particularly limited, but is preferably in the range of 5 to 40 g / m 2 . If the plating amount of the lower electrogalvanized layer is less than 5 g / m 2 , corrosion resistance may deteriorate. On the other hand, if the plating amount of the lower electrogalvanized layer exceeds 40 g / m 2 , press formability may deteriorate.
【００１４】[0014]
【実施例】次に、この発明を、実施例に基づいて説明す
る。冷延鋼板に対し、通常の方法で脱脂、酸洗を施した
後、表１に示したＡ、Ｂの２種類の電気亜鉛めっき浴の
何れかを使用して電気亜鉛めっきを施し、鋼板の表面上
に、表３および表４に示す、下層めっき層と、鉛含有量
が10ppm 以下で、めっき量が0.5 〜５g/m2の上層めっき
層とからなる２層の電気亜鉛めっき層を形成し、次い
で、表２に示したａまたはｂの条件でクロメート処理を
施して、上層電気亜鉛めっき層の上にクロメート被膜を
形成した。かくして、本発明の電気亜鉛めっき鋼板の試
験片（以下、本発明試験片という）No. １〜10を調製し
た。EXAMPLES Next, the present invention will be explained based on examples. After degreasing and pickling the cold-rolled steel sheet by the usual method, electrogalvanization is performed using one of the two types of electrogalvanizing baths A and B shown in Table 1, Formed on the surface are two electrogalvanized layers shown in Tables 3 and 4, consisting of a lower plating layer and an upper plating layer having a lead content of 10 ppm or less and a plating amount of 0.5 to 5 g / m 2. Then, a chromate treatment was performed under the conditions of a or b shown in Table 2 to form a chromate film on the upper electrogalvanized layer. Thus, test pieces (hereinafter referred to as test pieces of the present invention) Nos. 1 to 10 of the electrogalvanized steel sheet of the present invention were prepared.
【００１５】比較のために、表３および表５に示す、上
層電気亜鉛めっき層中の鉛含有量またはそのめっき量が
本発明の範囲外である電気亜鉛めっき鋼板の試験片、お
よび、単層の亜鉛電気めっき鋼板の試験片（以下、比較
用試験片という）No. １〜13を調製した。For comparison, a test piece of an electrogalvanized steel sheet having a lead content in the upper electrogalvanized layer or a plating amount thereof outside the scope of the present invention shown in Tables 3 and 5 and a single layer No. 1 to 13 test pieces of galvanized steel sheet (hereinafter referred to as comparative test pieces) were prepared.
【００１６】表３〜５に、本発明試験片および比較用試
験片の各々における、電気亜鉛めっき時のめっき浴組
成、上層および下層のめっき時におけるめっき浴中の鉛
含有量、上層および下層のめっき層中の鉛含有量、めっ
き液流速、および、クロメート処理条件を示す。In Tables 3 to 5, in each of the test piece of the present invention and the test piece for comparison, the plating bath composition during electrogalvanizing, the lead content in the plating bath during the plating of the upper and lower layers, and the upper and lower layers The lead content in the plating layer, the plating solution flow rate, and the chromate treatment conditions are shown.
【００１７】 [0017]
【００１８】 [0018]
【００１９】[0019]
【表３】 [Table 3]
【００２０】[0020]
【表４】 [Table 4]
【００２１】[0021]
【表５】 [Table 5]
【００２２】上述した本発明試験片および比較用試験片
の各々の耐黒変性を、以下に述べる性能試験によって調
査し、その試験結果を表３〜５に併せて示す。The blackening resistance of each of the test piece of the present invention and the test piece for comparison described above was investigated by the performance test described below, and the test results are also shown in Tables 3-5.
【００２３】耐黒変性試験：本発明試験片および比較用
試験片の各々を複数枚積み重ね、積み重ねられた状態の
試験片に対し、温度50℃、ＲＨ95% の湿潤試験を60日間
施した。このような、湿潤試験の前後における各試験片
の白色度を、JIS Z 8730に準拠するLab 系で測定して白
色度の変化量（ΔＬ）を求め、得られた変化量（ΔＬ）
によって、下記により評価した。 ○：ΔＬ≧−２ ×：ΔＬ＜−２Blackening resistance test: A plurality of test pieces of the present invention and comparative test pieces were stacked, and the stacked test pieces were subjected to a humidity test at a temperature of 50 ° C. and RH of 95% for 60 days. The whiteness of each test piece before and after the wet test is measured by a Lab system conforming to JIS Z 8730 to obtain the whiteness change amount (ΔL), and the obtained change amount (ΔL)
Was evaluated by the following. ◯: ΔL ≧ −2 ×: ΔL <−2
【００２４】比較用試験片No. １、２、４、６、７、９
においては、上層めっき層のめっき量が本発明の範囲を
外れて少ないために、上層めっき層の効果が十分に発揮
されず、耐黒変性が悪かった。比較用試験片No. ３、８
においては、上層めっき層中の鉛含有量が本発明の範囲
を外れて多いために、耐黒変性が悪かった。Comparative test pieces No. 1, 2, 4, 6, 7, 9
In the above, since the plating amount of the upper plating layer was out of the range of the present invention and was small, the effect of the upper plating layer was not sufficiently exhibited and the blackening resistance was poor. Comparative test pieces No. 3, 8
In the above, since the lead content in the upper plating layer is out of the range of the present invention, the blackening resistance is poor.
【００２５】比較用試験片No. 11〜12においては、電気
亜鉛めっき層が単層であり、且つ、めっき層中の鉛含有
量が10ppm を超えているために、耐黒変性が悪かった。In Comparative Test Specimen Nos. 11 to 12, the electrogalvanized layer was a single layer, and the lead content in the plated layer was more than 10 ppm, so the blackening resistance was poor.
【００２６】比較用試験片No. 13は、電気亜鉛めっき層
が単層ではあるが、めっき浴中の鉛含有量を0.1ppmまで
低減させてめっきを行った例である。比較用試験片No.
13においては、めっき層中の鉛含有量は7.5ppmであって
低く、耐黒変性は良好であった。しかしながら、めっき
層中の鉛含有量を、上述したように低減するために、め
っき浴中に、約40g/l の量の炭酸ストロンチウムを添加
しなければならなかった。Comparative test piece No. 13 is an example in which the electrogalvanized layer was a single layer, but plating was performed with the lead content in the plating bath reduced to 0.1 ppm. Comparative test piece No.
In No. 13, the lead content in the plating layer was 7.5 ppm, which was low, and the blackening resistance was good. However, in order to reduce the lead content in the plating layer as described above, it was necessary to add an amount of strontium carbonate of about 40 g / l to the plating bath.
【００２７】図１は、めっき浴中に対する炭酸ストロン
チウムの添加量と、めっき浴中の鉛含有量との関係を示
すグラフである。図１から、めっき浴中の鉛含有量を、
わずか0.4 ppm 低減するために、その100,000 倍の量の
炭酸ストロンチウムを添加する必要のあることが明らか
である。このように、多量の炭酸ストロンチウムを必要
とすることは極めて非効率的であり、製造コストが大幅
に上昇する問題が生ずる。FIG. 1 is a graph showing the relationship between the amount of strontium carbonate added to the plating bath and the lead content in the plating bath. From Figure 1, the lead content in the plating bath is
It is clear that it is necessary to add 100,000 times that amount of strontium carbonate to reduce it by only 0.4 ppm. As described above, requiring a large amount of strontium carbonate is extremely inefficient and causes a problem that the manufacturing cost is significantly increased.
【００２８】これに対して、亜鉛めっき層中の鉛含有量
が10ppm 以下である本発明供試体No. １〜９において
は、めっき浴の成分組成、亜鉛めっき条件およびクロメ
ート処理条件にかかわらず、耐黒変性に優れていた。On the other hand, in the sample Nos. 1 to 9 of the present invention in which the lead content in the galvanized layer is 10 ppm or less, regardless of the composition of the plating bath, the galvanizing conditions and the chromate treatment conditions, It was excellent in blackening resistance.
【００２９】[0029]
【発明の効果】以上説明したように、この発明によれ
ば、亜鉛めっき浴の成分組成、亜鉛めっき条件およびク
ロメート処理条件にかかわらず、耐黒変性に優れた電気
亜鉛めっき鋼板が得られる、工業上有用な効果がもたら
される。As described above, according to the present invention, an electrogalvanized steel sheet excellent in blackening resistance can be obtained regardless of the composition of the zinc plating bath, the zinc plating conditions and the chromate treatment conditions. It brings about a useful effect.
【図１】めっき浴中に対する炭酸ストロンチウムの添加
量と、めっき浴中の鉛含有量との関係を示すグラフであ
る。FIG. 1 is a graph showing the relationship between the amount of strontium carbonate added to the plating bath and the lead content in the plating bath.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山下 正明 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 大熊 俊之 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 三好 達也 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masaaki Yamashita 1-2, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Toshiyuki Okuma 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Date Inside the Steel Pipe Co., Ltd. (72) Inventor Tatsuya Miyoshi 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Steel Pipe Co., Ltd.
Claims (2)
れた、下層としての電気亜鉛めっき層と、前記下層とし
ての電気亜鉛めっき層の上に形成された、鉛含有量が10
ppm 以下であり、そして、めっき量が0.5 から５g/m2の
範囲内である、上層としての電気亜鉛めっき層とからな
ることを特徴とする、２つのめっき層を有する、耐黒変
性に優れた電気亜鉛めっき鋼板。1. An electrogalvanized layer as a lower layer formed on at least one surface of a steel sheet, and a lead content of 10 formed on the electrogalvanized layer as the lower layer.
Excellent in black resistance, having two plating layers, characterized by comprising an electrogalvanized layer as an upper layer having a plating amount of 0.5 ppm or less and 0.5 to 5 g / m 2. Electrogalvanized steel sheet.
に、クロメート被膜が形成されている、請求項１記載の
電気亜鉛めっき鋼板。2. The electrogalvanized steel sheet according to claim 1, wherein a chromate film is formed on the electrogalvanized layer as the upper layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5943992A JP2940289B2 (en) | 1992-02-13 | 1992-02-13 | Electrogalvanized steel sheet with two plating layers and excellent blackening resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5943992A JP2940289B2 (en) | 1992-02-13 | 1992-02-13 | Electrogalvanized steel sheet with two plating layers and excellent blackening resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05222572A true JPH05222572A (en) | 1993-08-31 |
| JP2940289B2 JP2940289B2 (en) | 1999-08-25 |
Family
ID=13113317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5943992A Expired - Fee Related JP2940289B2 (en) | 1992-02-13 | 1992-02-13 | Electrogalvanized steel sheet with two plating layers and excellent blackening resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2940289B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08260189A (en) * | 1995-03-22 | 1996-10-08 | Nippon Steel Corp | Electrogalvanized steel sheet excellent in uniform appearance after phosphating |
| KR100403465B1 (en) * | 1998-12-24 | 2004-01-28 | 주식회사 포스코 | Manufacturing method of galvanized steel sheet galvanized in two stages |
| KR100406469B1 (en) * | 1998-10-21 | 2004-03-24 | 주식회사 포스코 | Manufacturing method of continuous galvanized steel sheet without black pattern defects |
| WO2013051268A1 (en) * | 2011-10-04 | 2013-04-11 | Ｊｆｅスチール株式会社 | Production method for zinc-electroplated steel sheet |
| KR20200079049A (en) * | 2018-12-24 | 2020-07-02 | 현대자동차주식회사 | Excellent activation whisker resistant zinc coating method for electrical and electronic components |
-
1992
- 1992-02-13 JP JP5943992A patent/JP2940289B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08260189A (en) * | 1995-03-22 | 1996-10-08 | Nippon Steel Corp | Electrogalvanized steel sheet excellent in uniform appearance after phosphating |
| KR100406469B1 (en) * | 1998-10-21 | 2004-03-24 | 주식회사 포스코 | Manufacturing method of continuous galvanized steel sheet without black pattern defects |
| KR100403465B1 (en) * | 1998-12-24 | 2004-01-28 | 주식회사 포스코 | Manufacturing method of galvanized steel sheet galvanized in two stages |
| WO2013051268A1 (en) * | 2011-10-04 | 2013-04-11 | Ｊｆｅスチール株式会社 | Production method for zinc-electroplated steel sheet |
| JP2013079422A (en) * | 2011-10-04 | 2013-05-02 | Jfe Steel Corp | Production method for zinc-electroplated steel sheet |
| CN103842558A (en) * | 2011-10-04 | 2014-06-04 | 杰富意钢铁株式会社 | Production method for zinc-electroplated steel sheet |
| KR20200079049A (en) * | 2018-12-24 | 2020-07-02 | 현대자동차주식회사 | Excellent activation whisker resistant zinc coating method for electrical and electronic components |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2940289B2 (en) | 1999-08-25 |
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