JPS62185883A - Galvanized steel sheet having excellent formability - Google Patents
Galvanized steel sheet having excellent formabilityInfo
- Publication number
- JPS62185883A JPS62185883A JP2599786A JP2599786A JPS62185883A JP S62185883 A JPS62185883 A JP S62185883A JP 2599786 A JP2599786 A JP 2599786A JP 2599786 A JP2599786 A JP 2599786A JP S62185883 A JPS62185883 A JP S62185883A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- chromate
- chromate film
- electrolytic
- film
- 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
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 12
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 12
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000005260 corrosion Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 12
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007747 plating Methods 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000004299 exfoliation Methods 0.000 abstract 1
- 238000007654 immersion Methods 0.000 abstract 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- ONIOAEVPMYCHKX-UHFFFAOYSA-N carbonic acid;zinc Chemical compound [Zn].OC(O)=O ONIOAEVPMYCHKX-UHFFFAOYSA-N 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000011667 zinc carbonate Substances 0.000 description 1
- 229910000010 zinc carbonate Inorganic materials 0.000 description 1
- 235000004416 zinc carbonate Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、成形性に優れた亜鉛メッキ鋼板に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a galvanized steel sheet with excellent formability.
（従来技術及び発明が解決しようとする問題点）亜鉛メ
ッキ鋼板に耐食性を付与するためクロメート処理により
耐食性を向上せしめることが行なわれている、一般に亜
鉛メッキ鋼板に塗装を前提とする場合は、電解クロメー
ト処理、塗装せずそのま＼用いるものには塗布型クロメ
ート処理を施してい漬。又特開昭６０−１３０７８号の
ごとく塗布型で二ノ四とする処理がある。(Prior art and problems to be solved by the invention) In order to impart corrosion resistance to galvanized steel sheets, chromate treatment is carried out to improve the corrosion resistance. Chromate treatment: If used as is without painting, apply chromate treatment. There is also a coating type treatment as disclosed in Japanese Patent Application Laid-open No. 13078/1983.
しかして、このようなりロメート処理した亜鉛メッキ鋼
板をプレス成形すると、金型に亜鉛が固着し、これが成
形毎に序々に堆積し、疵の原因となる、いわゆる耐かじ
シ性が低下する、特に塗布型クロメート処理の電気亜鉛
メッキ鋼板に顕著である等の欠点をともなうものである
。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。However, when press-forming a galvanized steel sheet that has been subjected to romate treatment, zinc adheres to the mold and gradually accumulates with each molding, causing scratches and reducing the so-called galvanic resistance. This is accompanied by drawbacks, such as those which are noticeable in electrolytic galvanized steel sheets subjected to coating-type chromate treatment. The present invention has been made to advantageously solve these drawbacks.
（問題点を解決するための手段）
本発明の特徴とするところは、亜鉛メッキ表面に電解ク
ロメート皮膜を形成し、その上層に塗布型クロメート皮
膜を形成せしめた、成形性に優れた亜鉛メッキ鋼板に関
するものである。(Means for Solving the Problems) The present invention is characterized by forming an electrolytic chromate film on the galvanized surface and forming a coated chromate film on the top layer of the galvanized steel sheet, which has excellent formability. It is related to.
亜鉛メッキ鋼板、特に電気亜鉛メッキ鋼板のメッキ表面
は、活性な表面となっているため、プレス成形時に金型
に付着しやすく、かじりを起しやすい。そこで上記のご
とく、まずメッキ表面に電解クロメートは膜を形成せし
める、このクロメ−なっておシ、これがメッキ表面に緻
否な皮膜として被覆されるものと認められ、耐かじり性
向上に大きく寄与する、反面耐食性には劣る。The plating surface of a galvanized steel sheet, especially an electrogalvanized steel sheet, is an active surface, so it easily adheres to the mold during press forming and is prone to galling. Therefore, as mentioned above, electrolytic chromate first forms a film on the plating surface, and this chromate is recognized to be coated on the plating surface as a fine film, which greatly contributes to improving galling resistance. However, it has poor corrosion resistance.
この電解クロメート皮膜の上層に塗布型クロメート皮膜
を形成する、このクロメート皮膜は、Ｃｒ＋６ が主
体となっており、自己修復作用があり、耐食性を向上さ
せるものである。A coated chromate film is formed on the electrolytic chromate film, and this chromate film is mainly composed of Cr+6, has a self-healing action, and improves corrosion resistance.
しかして、このように構成することにより、従来の電解
又は塗布型の単一は膜に比べ、耐かじり性（プレス成形
性）、耐食性ともに向上させることができる。亜鉛メッ
キ鋼板としては、溶融亜鉛メッキ鋼板２．電気亜鉛メッ
キ鋼板に用いることができ、同様な効果が得られる。With this configuration, both galling resistance (press formability) and corrosion resistance can be improved compared to conventional electrolytic or coating type single membranes. Examples of galvanized steel sheets include hot-dip galvanized steel sheets2. It can be used for electrogalvanized steel sheets and similar effects can be obtained.
電解クロメート皮膜量としては、５〜７０ ｍ９／ｗ？
が適当である、約５ ｍ９／ ｍ’以下であると、耐か
じり性に劣り、又約７０１ｎ９／ｍ’以上になると硬質
であるクロメート皮膜自体の特徴が顕著となって却って
耐かじり性は劣化する。The amount of electrolytic chromate film is 5 to 70 m9/w?
If it is less than about 5 m9/m', the galling resistance will be poor, and if it is more than about 701 m9/m', the characteristics of the hard chromate film itself will become noticeable and the galling resistance will deteriorate. do.
また電解クロメート皮膜の上層に形成する塗布型クロメ
ート皮膜量としては°１０〜６０ ｍ９ ／ ｎｉ’で
十分である、約１ｏｒｎ９／ｒｒ？以下であると、耐食
性が劣り好ましくない、又約７０ｍ９／−以上になると
、硬質であるクロメート皮膜自体の特徴が顕著となって
、却って耐かじり性は劣化するので好ましくない。Also, the amount of the applied chromate film to be formed on the upper layer of the electrolytic chromate film is sufficient to be 10 to 60 m9/ni', approximately 1 or9/rr? If it is less than this, the corrosion resistance will be poor, and if it is more than about 70 m9/-, the characteristics of the hard chromate film itself will become noticeable, and the galling resistance will deteriorate, which is not preferable.
次に電解クロメート皮膜形成は、すでに知られているク
ロメート液、電解条件でよい、又塗布型クロメート皮膜
形成も、すでに知られているクロメート液で、例えばス
プレー又は浸漬により塗布することができる。このよう
に本発明によれば、耐食性等を劣化させることなく、む
しろ若干向上させて、プレス成形性を向上させることが
できる。Next, electrolytic chromate film formation may be performed using a known chromate solution and electrolytic conditions, and coating-type chromate film formation may be performed using a known chromate solution, for example, by spraying or dipping. As described above, according to the present invention, corrosion resistance and the like can be slightly improved without deteriorating, and press formability can be improved.
即ち、電解クロメート皮膜の存在によって潤滑性が向上
するために、プレス過程での塗布型クロメート皮膜自体
のかじシによる剥離が低減できるからである。That is, since the presence of the electrolytic chromate film improves lubricity, peeling of the applied chromate film itself due to rudder during the pressing process can be reduced.
（実施例） 次に本発明の実施例を比較例とともに挙げる。(Example) Next, examples of the present invention will be listed together with comparative examples.
注１： メッキ原板は、板厚１．０閣、板巾７２０ｍｍ
、の軟鋼板。Note 1: The original plated plate has a thickness of 1.0 mm and a width of 720 mm.
, mild steel plate.
注２：溶融は通常の熱漬溶融亜鉛メッキ、電気は通常の
電気亜鉛メッキ
注３：電解クロメート条件は、ＣｒＯ３： ５０ ｆｆ
７’Ｌ 。Note 2: Melting is normal hot dip galvanizing, electric is normal electrolytic galvanizing Note 3: Electrolytic chromate conditions are CrO3: 50 ff
7'L.
ＺｎＣＯ３： １１ｙ／ｌ 、 Ｈ３ＰＯ４： ２０
ｖ／ｌ 。ZnCO3: 11y/l, H3PO4: 20
v/l.
Ｈ２ＳＯ，： ｏ、４ｃｃ／ｚの水溶液（ＰＨ０，８）
中で９ Ａ ／ ｄ ｍ’の′電流密度で行なった。H2SO,: o, 4cc/z aqueous solution (PH0,8)
The experiments were carried out at a current density of 9 A/d m'.
注４：堕布型クロメート条件は、ＣｒＯ３： ５０ ｔ
／Ｌ。Note 4: Fallen type chromate conditions are CrO3: 50 t
/L.
ＳｉＯ□１００φの水溶液（ＰＨ１，０）に浸漬しロー
ル絞りを施した。It was immersed in an aqueous solution of SiO□100φ (PH 1,0) and subjected to roll squeezing.
注５ ：耐食性はＪＩＳ Ｚ ２３７１に示す塩水噴霧
試験を行ない１４４ ｈｒ 時点での腐食程度を１９段
階に評価した。Note 5: For corrosion resistance, a salt spray test according to JIS Z 2371 was conducted, and the degree of corrosion at 144 hr was evaluated on a scale of 19.
評点 １０（良□１（悪）
注６ ：成形性は、図示のごときテストを施し、金型に
付着した亜鉛量を測定した。Rating: 10 (Good □ 1 (Poor)) Note 6: For moldability, a test as shown in the figure was conducted, and the amount of zinc attached to the mold was measured.
止金型１と下金型２の間に上記実施例及び比較例に示す
鋼板３を配置し、押付圧１０Ｑ ｆ ／ａｃｔ 、引き
抜き速度３００ｒｒｍ／分、 引き抜き長さ３００ｍで
テストした。The steel plate 3 shown in the above Examples and Comparative Examples was placed between the retaining die 1 and the lower die 2, and a test was conducted at a pressing pressure of 10 Q f /act, a drawing speed of 300 rrm/min, and a drawing length of 300 m.
Ａ：１０ｍｍ、Ｂ：１０ｍｍ、Ｃ：２６ｍｍ。A: 10mm, B: 10mm, C: 26mm.
Ｒ，、Ｒ，、Ｒ３：３Ｒ
（発明の効果）
本発明によれば成形性に優れ、耐食性でも向上させるこ
とができる等の優れた効果が得られる。R,,R,,R3:3R (Effects of the Invention) According to the present invention, excellent effects such as excellent moldability and improved corrosion resistance can be obtained.
第１図は、成形性試験の一例を示す説明図である。 FIG. 1 is an explanatory diagram showing an example of a moldability test.
Claims (1)
の上層に塗布型クロメート皮膜を形成せしめた、成形性
に優れた亜鉛メッキ鋼板。A galvanized steel sheet with excellent formability, with an electrolytic chromate film formed on the surface of the galvanized steel sheet and a coated chromate film formed on top of that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2599786A JPS62185883A (en) | 1986-02-10 | 1986-02-10 | Galvanized steel sheet having excellent formability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2599786A JPS62185883A (en) | 1986-02-10 | 1986-02-10 | Galvanized steel sheet having excellent formability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62185883A true JPS62185883A (en) | 1987-08-14 |
Family
ID=12181359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2599786A Pending JPS62185883A (en) | 1986-02-10 | 1986-02-10 | Galvanized steel sheet having excellent formability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62185883A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02115381A (en) * | 1988-10-25 | 1990-04-27 | Sumitomo Metal Ind Ltd | Surface-treated steel sheet having superior fanciness |
-
1986
- 1986-02-10 JP JP2599786A patent/JPS62185883A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02115381A (en) * | 1988-10-25 | 1990-04-27 | Sumitomo Metal Ind Ltd | Surface-treated steel sheet having superior fanciness |
| JPH0548308B2 (en) * | 1988-10-25 | 1993-07-21 | Sumitomo Metal Ind |
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