JPH0219450A - Formation of oxide film on alloyed hot dip galvanized steel sheet - Google Patents
Formation of oxide film on alloyed hot dip galvanized steel sheetInfo
- Publication number
- JPH0219450A JPH0219450A JP16592188A JP16592188A JPH0219450A JP H0219450 A JPH0219450 A JP H0219450A JP 16592188 A JP16592188 A JP 16592188A JP 16592188 A JP16592188 A JP 16592188A JP H0219450 A JPH0219450 A JP H0219450A
- Authority
- JP
- Japan
- Prior art keywords
- oxide film
- steel sheet
- layer
- hot dip
- galvanized steel
- 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
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 12
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 12
- 230000015572 biosynthetic process Effects 0.000 title description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005275 alloying Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 15
- 239000010959 steel Substances 0.000 abstract description 15
- 238000001816 cooling Methods 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 238000005246 galvanizing Methods 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 229910001297 Zn alloy Inorganic materials 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000007747 plating Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、溶融合金化亜鉛メッキ鋼板の酸化膜生成方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for forming an oxide film on a molten metallized galvanized steel sheet.
［従来の技術］
溶融合金性亜鉛メッキ鋼板の溶接性を向上するため、そ
の表面にＺｎＯ含有の酸化膜を生成することが知られて
いる（特開昭５９−１０４４８３号公報）。[Prior Art] In order to improve the weldability of molten alloy galvanized steel sheets, it is known to form a ZnO-containing oxide film on the surface thereof (Japanese Patent Laid-Open No. 104483/1983).
しかして、このようなＺｎＯ系の酸化膜を工業的規模で
、確実に生成することが、最も重要なことであり、強く
要求されているところである。Therefore, it is most important and strongly required to reliably produce such a ZnO-based oxide film on an industrial scale.
［発明が解決しようとする課題］
本発明は、このような要求を有利に満足する優れたＺｎ
Ｏ系酸化膜の生成方法を提供するものである。[Problems to be Solved by the Invention] The present invention provides an excellent Zn material that advantageously satisfies these requirements.
The present invention provides a method for producing an O-based oxide film.
［課題を解決するための手段］
本発明は、溶融亜鉛メッキ鋼板を加熱し、合金化処理後
、霧化水と溶接せしめ４５０℃以下に冷却し、次いで４
０℃以上の高露点雰囲気と接触し、表面に酸化膜を生成
することを特徴とする溶融合金化亜鉛メッキ鋼板の酸化
膜生成方法に関するものである。[Means for Solving the Problems] The present invention heats a hot-dip galvanized steel sheet, after alloying treatment, welds it with atomized water, cools it to 450°C or less, and then
The present invention relates to a method for forming an oxide film on a molten alloyed galvanized steel sheet, which is characterized by forming an oxide film on the surface of a galvanized steel sheet in contact with a high dew point atmosphere of 0° C. or higher.
本発明における溶融合金化亜鉛メッキ鋼板としては、例
えば溶融亜鉛メッキ後、加熱し、熱拡散により鋼板の鉄
がメッキ層中へ拡散し、メッキ層中の鉄量が７〜１５％
、メッキ付着量２０〜８０ｇ／イのメッキ鋼板である。For example, the hot-dip galvanized steel sheet in the present invention is heated after hot-dip galvanizing, and the iron of the steel sheet is diffused into the plating layer by thermal diffusion, so that the amount of iron in the plating layer is 7 to 15%.
, a plated steel plate with a coating weight of 20 to 80 g/I.
しかして、このようなメッキ鋼板においては、一般に溶
融亜鉛メッキ後、板温４８０〜５３０℃で、数秒〜十数
秒間加熱するものであり、本発明においては、加熱後４
５０℃以下に霧化水と接触して冷却する。即ち、メッキ
鋼板（帯）が合金化炉を出た後、速やかに合金化反応を
終了させることによって、次の酸化膜生成が早期に行な
われるようにするものであり、４５０℃超であると僅か
ではあるが合金化反応が起っており、酸化膜生成が起り
にくく好ましくない。However, such galvanized steel sheets are generally heated at a plate temperature of 480 to 530°C for several seconds to more than ten seconds after hot-dip galvanizing.
Cool to below 50°C by contacting with atomized water. In other words, after the plated steel plate (strip) leaves the alloying furnace, the alloying reaction is quickly terminated so that the next oxide film is formed early. Although the alloying reaction is slight, it is difficult to form an oxide film, which is not preferable.
霧化水としては、水を霧化状にしたもの、又は気水混合
で霧化状にしたものを用いることができる。As the atomized water, water atomized or water atomized by mixing air and water can be used.
このようにして冷却するメッキ鋼板の下限温度としては
、１００℃が好ましい。即ち冷却に引続き高露点雰囲気
に接触せしめて、表面に酸化膜を生成せしめるに際し、
メッキ鋼板が高温である程酸化膜生成が容易になり、１
００℃未満になると高速ラインにおいては、確実な酸化
膜の生成が難しくなり、高速ラインでは好ましくない。The lower limit temperature of the plated steel plate to be cooled in this manner is preferably 100°C. That is, when the material is cooled and then brought into contact with a high dew point atmosphere to form an oxide film on the surface,
The higher the temperature of the plated steel sheet, the easier it is to form an oxide film.
If the temperature is lower than 00° C., it becomes difficult to reliably form an oxide film in high-speed lines, which is not preferable in high-speed lines.
次に酸化膜を生成するための高露点雰囲気（ガス）とし
ては、例えば、霧化水または水蒸気に合金化炉の燃焼排
ガスを混入して、４０℃以上の露点雰囲気とし、上記の
ごとく合金化処理して冷却したメッキ鋼板と接触せしめ
、ＺｎＯ含有酸化膜を生成するものであり、露点が４０
℃未満であると、酸化膜の生成が遅く、連続処理ライン
（とくに高速ライン）では好ましくない。Next, as a high dew point atmosphere (gas) for generating an oxide film, for example, atomized water or steam is mixed with combustion exhaust gas from an alloying furnace to create a dew point atmosphere of 40°C or higher, and alloying is performed as described above. It is brought into contact with a plated steel sheet that has been treated and cooled to form a ZnO-containing oxide film, with a dew point of 40
If the temperature is less than 0.degree. C., the formation of an oxide film is slow, which is not preferable for continuous processing lines (especially high-speed lines).
しかして、このような高露点雰囲気帯は、冷却後のメッ
キ鋼板（帯）通板位置に１ケ所又は２ケ所設け、上記の
ごとき雰囲気とし、メッキ鋼板と接触して酸化膜を生成
するものである。However, such a high dew point atmosphere zone is provided at one or two locations at the position where the plated steel sheet (strip) is passed through after cooling, and the above atmosphere is created so that an oxide film is generated by contact with the plated steel sheet. be.
酸化膜の生成量としては、ｌＯ〜３０００ａ＋ｇ／ｒｒ
？で、例えばスポット溶接電極が溶接時の発熱により、
メッキ金属が溶解付着するのを確実に阻止することがで
きる。The amount of oxide film produced is lO~3000a+g/rr
? For example, spot welding electrodes generate heat during welding,
It is possible to reliably prevent plated metal from melting and adhering.
次に本発明の一例を図面により説明する。Next, an example of the present invention will be explained with reference to the drawings.
図面において、鋼帯１を溶融亜鉛浴２へ導きメッキ後、
ノズル３からガスを噴射し、所定付着量に制御した後、
合金化炉４へ導き、加熱してメッキ金属を合金化処理す
る。In the drawing, a steel strip 1 is introduced into a molten zinc bath 2 and after plating,
After injecting gas from the nozzle 3 and controlling the amount of adhesion to a predetermined amount,
The plated metal is guided to an alloying furnace 4 and heated to alloy the plated metal.
次いで冷却帯５で霧化水と接触して４５０℃以下に冷却
し、次いで、高露点雰囲気帯６で、４０℃以上の露点雰
囲気と接触せしめ酸化膜を生成する。Next, it is brought into contact with atomized water in a cooling zone 5 to be cooled to 450° C. or lower, and then brought into contact with a dew point atmosphere of 40° C. or higher in a high dew point atmosphere zone 6 to form an oxide film.
即ち、合金化炉４の排ガスをプロワークを介して供給菅
８から高露点雰囲気帯６へ導き、一方供給管８ａから霧
化水又は水蒸気を雰囲気帯６へ供給し、４０℃以上の高
露点雰囲気とする。That is, the exhaust gas from the alloying furnace 4 is guided from the supply tube 8 to the high dew point atmosphere zone 6 via the prowork, and the atomized water or water vapor is supplied from the supply pipe 8a to the atmosphere zone 6 to achieve a high dew point of 40° C. or higher. Create an atmosphere.
更に例えば、高速ライン、酸化膜量の増量等、必要に応
じて、高露点雰囲気帯６ａで同様に４０℃以上の高露点
雰囲気と接触せしめて、より酸化膜を確実に生成せしめ
るものである。Furthermore, if necessary, for example, for a high-speed line or an increase in the amount of oxide film, contact may be made with a high dew point atmosphere of 40° C. or higher in the high dew point atmosphere zone 6a to more reliably form an oxide film.
しかして、メッキラインによっては、高露点雰囲気帯６
及び／又は６ａを設備配置するものである。However, depending on the plating line, the high dew point atmosphere zone 6
and/or 6a.
［実 施 例］ 次に本発明の実施例を比較例とともに第１表に挙げる。[Example] Next, Examples of the present invention are listed in Table 1 along with comparative examples.
［発明の効果コ
かくすることにより、スポット溶接等を向上する酸化膜
を確実に、しかも工業的規模で安定して生成することが
できる等の優れた効果が得られる。[Effects of the Invention] By doing so, excellent effects such as being able to reliably and stably produce an oxide film that improves spot welding and the like on an industrial scale can be obtained.
第１図は、本発明の一例を示す説明図である。 １：鋼 帯 ５：冷却帯 ６：高露点雰囲気帯 FIG. 1 is an explanatory diagram showing an example of the present invention. 1: Steel band 5: Cooling zone 6: High dew point atmosphere zone
Claims (1)
接触せしめ４５０℃以下に冷却し、次いで４０℃以上の
高露点雰囲気と接触し、表面に酸化膜を生成することを
特徴とする溶融合金化亜鉛メッキ鋼板の酸化膜生成方法
。A hot-dip galvanized steel sheet is heated, after alloying treatment, brought into contact with atomized water, cooled to below 450°C, and then brought into contact with a high dew point atmosphere of above 40°C to form an oxide film on the surface. A method for forming an oxide film on molten alloyed galvanized steel sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63165921A JP2583982B2 (en) | 1988-07-05 | 1988-07-05 | Method for forming oxide film on galvannealed steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63165921A JP2583982B2 (en) | 1988-07-05 | 1988-07-05 | Method for forming oxide film on galvannealed steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0219450A true JPH0219450A (en) | 1990-01-23 |
| JP2583982B2 JP2583982B2 (en) | 1997-02-19 |
Family
ID=15821543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63165921A Expired - Lifetime JP2583982B2 (en) | 1988-07-05 | 1988-07-05 | Method for forming oxide film on galvannealed steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2583982B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59104432A (en) * | 1982-12-06 | 1984-06-16 | Nippon Steel Corp | Preparation of zinc plated steel plate excellent in weldability |
| JPS61295362A (en) * | 1985-06-21 | 1986-12-26 | Sumitomo Metal Ind Ltd | Alloying treatment furnace |
-
1988
- 1988-07-05 JP JP63165921A patent/JP2583982B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59104432A (en) * | 1982-12-06 | 1984-06-16 | Nippon Steel Corp | Preparation of zinc plated steel plate excellent in weldability |
| JPS61295362A (en) * | 1985-06-21 | 1986-12-26 | Sumitomo Metal Ind Ltd | Alloying treatment furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2583982B2 (en) | 1997-02-19 |
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