JPH02243774A - Surface treated steel sheet excellent in weldability and its production - Google Patents
Surface treated steel sheet excellent in weldability and its productionInfo
- Publication number
- JPH02243774A JPH02243774A JP6298689A JP6298689A JPH02243774A JP H02243774 A JPH02243774 A JP H02243774A JP 6298689 A JP6298689 A JP 6298689A JP 6298689 A JP6298689 A JP 6298689A JP H02243774 A JPH02243774 A JP H02243774A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- weldability
- steel sheet
- treated steel
- production
- 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.)
- Pending
Links
Landscapes
- Coating With Molten Metal (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、溶接性に優れた表面処理用鋼板及びその製造
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a surface-treated steel plate with excellent weldability and a method for manufacturing the same.
（従来の技術）
周知の如く、クロムメツキ鋼板は、最上層にクロム酸化
物を生成せしめ耐食性を向上させている。(Prior Art) As is well known, chromium-plated steel sheets have chromium oxide formed in the top layer to improve corrosion resistance.
しかしながら、例えば溶接に際し、このクロム酸化物が
導電性を阻害し、溶接性を低下させている。However, for example, during welding, this chromium oxide inhibits electrical conductivity and reduces weldability.
このような難点を排除するため、クロムメツキ鋼板の金
属クロム表面に凹凸を形成し、溶接待電極の加圧により
、前記金属クロム表面の凸部によりクロム酸化物を破り
、鋼板と電極間では金属クロムと電極とを接触せしめ、
あるいは鋼板と鋼板間では金属クロムと金属クロムとを
直接接触せしめて導電性を確保することにより、溶接性
を一層向上せしめることが知られている（特開昭６１２
８１８９９号公報）。In order to eliminate such difficulties, we formed unevenness on the metal chromium surface of the chrome-plated steel plate, and when welding electrodes were applied with pressure, the chromium oxide was broken by the protrusions on the metal chromium surface, and the metal chromium was removed between the steel plate and the electrode. and the electrode,
Alternatively, it is known that weldability can be further improved by bringing metal chromium into direct contact between steel plates to ensure conductivity (Japanese Patent Laid-Open No. 612
81899).
又金属クロム表面に凹凸を形成させる方法としては、Ｃ
ｒ（ｈを主剤とするクロム酸浴中で鋼板を陰極として電
解によりクロムメツキを施し、次いで鋼板を陽極として
通電し、上層のクロム酸化物の一部を除去し、引き続き
金属クロムメツキ鋼板を陰極として電解し、上層にクロ
ムメツキを施すことにより、金属クロムの表面に凹凸を
形成することも上記特許公報に開示されている。In addition, as a method for forming unevenness on the surface of metal chromium, C
Chromium plating is performed by electrolysis using a steel plate as a cathode in a chromic acid bath containing r(h) as the main ingredient, then electricity is applied using the steel plate as an anode to remove a part of the chromium oxide on the upper layer, and then electrolysis is performed using the metal chromium plated steel plate as a cathode. However, the above-mentioned patent publication also discloses forming irregularities on the surface of metallic chromium by applying chrome plating to the upper layer.
又予め被メツキ鋼板に凹凸を形成し、これにクロムメツ
キを施すことにより、金属クロム層の表面を凹凸に形成
することも特開昭６３−１３４６９５号公報に開示され
ている。Furthermore, JP-A-63-134695 discloses that the surface of the metal chromium layer is formed to have an uneven surface by forming unevenness on a steel plate to be plated in advance and applying chrome plating to the plated steel plate.
しかしながら、前者の方法によれば操業が煩雑になり、
かつ逆電解電極への金属クロム析出の問題があり、後者
においてはロールに凹凸を形成し、これにより圧延して
メツキ原板に凹凸を転写することになり、作業も煩雑に
なり、かつ、ロール表面プロフィル管理が難しい等の欠
点を伴うものである。However, the former method makes the operation complicated;
In addition, there is a problem of metal chromium precipitation on the reverse electrolytic electrode, and in the latter case, unevenness is formed on the roll, which has to be rolled and transferred to the plated original plate, making the work complicated and causing damage to the roll surface. This method has drawbacks such as difficulty in profile management.
（発明が解決しようとする課題）
本発明は、このような欠点を有利に解決するためなされ
たものである。(Problems to be Solved by the Invention) The present invention has been made to advantageously solve these drawbacks.
（課題を解決するための手段） 本発明の要旨とするところには下記のとおりである。(Means for solving problems) The gist of the present invention is as follows.
（１）鋼板表面に水平方向のピッチ０．０１〜１．Ｏｎ
、垂直方向の深さ０．００５〜０．１μｍ−Ｒａの凹凸
を有する溶接性に優れた表面処理用鋼板。(1) Horizontal pitch of 0.01 to 1. On
, a steel plate for surface treatment with excellent weldability having irregularities with a vertical depth of 0.005 to 0.1 μm-Ra.
（２）無機酸水溶液中にｐ ｅ ３ ＋を１〜５０ｇ／
ｊ２添加し、該浴中に鋼板を浸漬して鋼板表面に凹凸を
形成することを特徴とする溶接性に優れた表面処理用鋼
板の製造方法。(2) 1 to 50 g/p of p e 3 + in an inorganic acid aqueous solution
1. A method for producing a surface-treated steel plate with excellent weldability, the method comprising adding J2 to the bath and immersing the steel plate in the bath to form irregularities on the surface of the steel plate.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
本発明においては、無機酸として、例えば硫酸。In the present invention, examples of the inorganic acid include sulfuric acid.
塩酸等の１０〜１００ｇ／２の水溶液にＦｅ”を１〜５
０ｇ／ｆｆ１（好ましくは３〜ｌＯｇ／４２）添加して
用いる。Ｐｅ”としては、例えば、硫酸水溶液の場合は
硫酸第２鉄、塩酸水溶液の場合は塩化第２鉄を添加する
。液温としては、液温維持及び処理性から３０〜５０°
Ｃが適当であり、高温程処理性は高まるが、水の蒸発が
激しくなり、濃度管理が難しくなり好ましくない。Add 1 to 5 Fe'' to 10 to 100 g/2 aqueous solution such as hydrochloric acid.
It is used by adding 0g/ff1 (preferably 3 to 1Og/42). For example, ferric sulfate is added in the case of a sulfuric acid aqueous solution, and ferric chloride is added in the case of a hydrochloric acid aqueous solution.The liquid temperature is 30 to 50° from the viewpoint of maintaining the liquid temperature and processability.
C is suitable, and the higher the temperature, the higher the processability, but it is not preferable because water evaporates more rapidly and concentration control becomes difficult.
次に鋼板を上記水溶液に浸漬して、その表面に凹凸を形
成する場合は、上記の如き水溶液であれば、３秒以上で
水平方向のピッチ０．０１〜１．０μｍ（好ましくは０
．０３〜０．５μｍ）、垂直方向の深さ０．００５〜０
．１ ｐｍ−Ｒａ（好ましくは０．０１〜０．０５ ａ
ｍ−Ｒａ）の凹凸を確実に均一に形成することができる
。Next, when a steel plate is immersed in the above aqueous solution to form irregularities on its surface, if the steel plate is immersed in the above aqueous solution, the pitch in the horizontal direction is 0.01 to 1.0 μm (preferably 0.0 μm) for 3 seconds or more.
．． 03-0.5 μm), vertical depth 0.005-0
．． 1 pm-Ra (preferably 0.01-0.05 a
m-Ra) can be reliably formed uniformly.
又上記の如き水溶液中で鋼板を陽極として通電し、その
表面に上記の如き凹凸を形成する場合は、通電密度１〜
５０Ａ／ｄｍ２、電気量１〜１０Ｃ／ｄｍ２の陽極処理
を施すことにより、確実に形成することができる。即ち
浸漬時間を３秒以上確保できない場合は、陽極処理によ
り、所定の表面凹凸が得られる。In addition, when applying current to a steel plate as an anode in an aqueous solution as described above to form irregularities as described above on the surface, the current density is 1 to 1.
It can be formed reliably by performing anodization at 50 A/dm2 and an electrical quantity of 1 to 10 C/dm2. That is, if the immersion time cannot be ensured for 3 seconds or more, a predetermined surface unevenness can be obtained by anodizing.
このように含Ｆｅ”無機酸水溶液に鋼板（帯）を浸漬す
るか又は該水溶液中で陽極処理することにより、その表
面に前記の如き凹凸を確実に形成できる理由は明らかで
はないが、次記の如く考えられる。It is not clear why the above-mentioned irregularities can be reliably formed on the surface of a steel plate (strip) by immersing it in an aqueous solution of an Fe-containing inorganic acid or by anodizing it in the aqueous solution, but the reason is as follows. It can be thought of as follows.
一般に無機酸中での金属ｒｅの熔解は
Ｆｅ ＋ ２ Ｈ” →Ｆｅ”十）１２↑ ・・・・・
・（１）式％式％）
酸化還元電位はｐＨＯにおいて、それぞれ−〇、４４Ｖ
。Generally, the melting of metal re in an inorganic acid is as follows: Fe + 2 H” →Fe”10) 12↑ ・・・・・・
・(1) Formula % Formula %) The oxidation-reduction potential is -0 and 44V, respectively, at pHO.
.
０■で、１１□発生過電圧を無視しても（１）式の駆動
力０、４４ Ｖである。一方含Ｆｅｌ＋無機酸水溶液中
では（１）式の他に、
Ｆｅ＋ ２ Ｆｅ”−＋ ３ Ｆｅ２′″ ・・・・
・・（２）式なる反応が進行し、Ｆｅ”／Ｆｅ、 Ｆｅ
”／Ｆｅ”の酸化還元電位は、それぞれ−０，４４Ｖ、
０．７７ Ｖで（２）式の駆動力は１．２１Ｖである
。無給、駆動力の大きさは、反応速度と比例するわけで
はないが（１）残反応のみと（１） ＋ （２）残反応
とでは後者のＦｅ溶解速度が早く、又溶解速度が微視的
に場所により異なり、結果として微細な凹凸が形成され
るものと考えられる。0■, even if the overvoltage generated at 11□ is ignored, the driving force in equation (1) is 0.44 V. On the other hand, in an Fe-containing Fe+ inorganic acid aqueous solution, in addition to formula (1), Fe+ 2 Fe"-+ 3 Fe2'"...
...The reaction of formula (2) progresses, and Fe''/Fe, Fe
The redox potential of "/Fe" is -0,44V, respectively.
At 0.77 V, the driving force of equation (2) is 1.21 V. The magnitude of the unsupplied driving force is not proportional to the reaction rate, but between (1) residual reaction only and (1) + (2) residual reaction, the Fe dissolution rate in the latter is faster, and the dissolution rate is microscopic. It is thought that the surface area differs depending on the location, and as a result, fine irregularities are formed.
本発明は、例えば缶用表面処理鋼板として溶接性を向上
する場合、前記の如く凹凸を形成し、その表面にＣｒ＋
Ｎｉ、 Ｃｒ−Ｎｉ、 Ｃｒ−Ｃｏ、 Ｎｉ−Ｃｏ等
の耐食性金属を３０〜２００■／ボ被覆せしめ、結果と
して、被覆金属表面に凹凸を形成せしめ、溶接時の電極
との溶接抵抗を低減して溶接性を向上するものである。In the present invention, when improving weldability as a surface-treated steel sheet for cans, for example, the unevenness is formed as described above, and the surface is made of Cr+
It is coated with a corrosion-resistant metal such as Ni, Cr-Ni, Cr-Co, Ni-Co, etc. at a rate of 30 to 200 cm/bo, resulting in the formation of irregularities on the surface of the coated metal, which reduces the welding resistance with the electrode during welding. This improves weldability.
（実施例） 次に本発明の実施例を挙げる。(Example) Next, examples of the present invention will be given.
（発明の効果）
本発明によれば、鋼板表面の凹凸を微細均一に、しかも
確実に形成せしめることができ、溶接性を向上する最適
な表面処理用鋼板が得られる。(Effects of the Invention) According to the present invention, unevenness on the surface of a steel plate can be formed finely and uniformly, and moreover, it is possible to obtain an optimal steel plate for surface treatment that improves weldability.
又酸浴処理のため、実操業上安定して凹凸を形成するこ
とができる等の優れた効果が奏される。Furthermore, because of the acid bath treatment, excellent effects such as being able to form irregularities stably in actual operation can be achieved.
Claims (2)
ｍ、垂直方向の深さ０．００５〜０．１μｍ−Ｒａの凹
凸を有する溶接性に優れた表面処理用鋼板。(1) Horizontal pitch of 0.01 to 1.0μ on the steel plate surface
A steel plate for surface treatment with excellent weldability, having irregularities of 0.005 to 0.1 μm-Ra in vertical depth.
添加し、該浴中に鋼板を浸漬して鋼板表面に凹凸を形成
することを特徴とする溶接性に優れた表面処理用鋼板の
製造方法。（３）浴中で鋼板を陽極処理することを特徴
とする請求項２に記載の溶接性に優れた表面処理用鋼板
の製造方法。(2) 1 to 50 g/l of Fe^3^+ in an inorganic acid aqueous solution
1. A method for producing a surface-treated steel plate with excellent weldability, the method comprising: adding a molten metal to the surface of the steel plate, and immersing the steel plate in the bath to form irregularities on the surface of the steel plate. (3) The method for manufacturing a surface-treated steel sheet with excellent weldability according to claim 2, characterized in that the steel sheet is anodized in a bath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6298689A JPH02243774A (en) | 1989-03-15 | 1989-03-15 | Surface treated steel sheet excellent in weldability and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6298689A JPH02243774A (en) | 1989-03-15 | 1989-03-15 | Surface treated steel sheet excellent in weldability and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02243774A true JPH02243774A (en) | 1990-09-27 |
Family
ID=13216195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6298689A Pending JPH02243774A (en) | 1989-03-15 | 1989-03-15 | Surface treated steel sheet excellent in weldability and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02243774A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05177764A (en) * | 1991-12-27 | 1993-07-20 | Nkk Corp | Laminated steel plate for welded can and production thereof |
-
1989
- 1989-03-15 JP JP6298689A patent/JPH02243774A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05177764A (en) * | 1991-12-27 | 1993-07-20 | Nkk Corp | Laminated steel plate for welded can and production thereof |
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