JPS6173873A - Manufacture of alloyed hot dip galvanized steel sheet having superior adhesion to paint - Google Patents
Manufacture of alloyed hot dip galvanized steel sheet having superior adhesion to paintInfo
- Publication number
- JPS6173873A JPS6173873A JP59193850A JP19385084A JPS6173873A JP S6173873 A JPS6173873 A JP S6173873A JP 59193850 A JP59193850 A JP 59193850A JP 19385084 A JP19385084 A JP 19385084A JP S6173873 A JPS6173873 A JP S6173873A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- hot dip
- steel sheet
- dip galvanized
- furnace
- 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
- 239000003973 paint Substances 0.000 title claims abstract description 13
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 12
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 238000005275 alloying Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 11
- 239000010959 steel Substances 0.000 claims abstract description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 8
- 238000005246 galvanizing Methods 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 238000011282 treatment Methods 0.000 abstract description 10
- 229910052725 zinc Inorganic materials 0.000 abstract description 6
- 239000011701 zinc Substances 0.000 abstract description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000011261 inert gas Substances 0.000 abstract description 2
- 238000004320 controlled atmosphere Methods 0.000 abstract 1
- 238000007747 plating Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 9
- 230000008020 evaporation Effects 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 210000004894 snout Anatomy 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
-
- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/285—Thermal after-treatment, e.g. treatment in oil bath for remelting the coating
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Thermal Sciences (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、表面性状が良好で塗装密着性に優れた合金化
溶融亜鉛めっき鋼板の製゛造方法に関し、とくに合金化
のための熱処理手段に特色のある技術についての提案で
ある。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing an alloyed hot-dip galvanized steel sheet that has good surface properties and excellent paint adhesion, and particularly relates to a method for manufacturing an alloyed hot-dip galvanized steel sheet that has good surface properties and excellent paint adhesion. This is a proposal for a unique technology.
めっき処理後に加熱することによってめっき層と素地鋼
とが合金化した、いわゆる合金化溶融亜鉛めっき鋼板は
、すぐれた塗装後耐食性（特に耐孔食性）と抵抗溶接性
を兼ね備えているため、自動車や家電製品、建築用素材
等として広く用いられている。The so-called alloyed hot-dip galvanized steel sheet, in which the plating layer and base steel are alloyed by heating after plating, has excellent post-painting corrosion resistance (particularly pitting corrosion resistance) and resistance weldability, so it is used in automobiles and other applications. Widely used as home appliances, building materials, etc.
（従来の技術）
従来、自動車外板として使用される板材は、車体の外面
となる鋼板面にはめつき層を施していない片面めっき鋼
板が多く用いられてきたが、近年車体外面錆の防止を目
的として、車体外面側にもめつき層を有する板を採用す
る傾向になっている。(Prior art) Conventionally, the sheet materials used for automobile exterior panels have often been single-sided plated steel sheets with no plating layer applied to the steel plate surface, which is the exterior surface of the vehicle body. For this purpose, there is a tendency to use plates that have a plating layer on the outer surface of the vehicle body as well.
ところが合金化溶融亜鉛めっき鋼板は、前述のように塗
装後の耐孔食性（耐パーフォレーション性）には優れて
いるものの、車体外面に採用するには不向きであった。However, although alloyed hot-dip galvanized steel sheets have excellent pitting corrosion resistance (perforation resistance) after painting as described above, they are not suitable for use on the exterior of vehicle bodies.
その理由は、従来合金化溶融亜鉛めっき鋼板を製造する
ときに、合金化させるぺ ゛く行う熱処理に際し炉
内の雰囲気調整を行っていないために酸化被膜が生成し
、これが上記欠点の原因となっていた。The reason for this is that when conventionally producing alloyed hot-dip galvanized steel sheets, the atmosphere in the furnace was not adjusted during the heat treatment for alloying, resulting in the formation of an oxide film, which caused the above-mentioned defects. was.
この点に関し従来は、めっき表面を機械的に研磨するこ
とにより酸化物除去を行っていたが、この際めっき表面
に研磨の跡が残り、塗膜密着不良を起す危険が残ってい
た。また特開昭５９−１６６３号として提案されている
ような酸やアルカリにより溶解除去する化学的方法では
、酸化物のみを溶解することが極めて困難であり、めっ
き層の溶解も生じるので実用的でなかった。In this regard, oxides have conventionally been removed by mechanically polishing the plated surface, but this leaves polishing marks on the plated surface, leaving a risk of poor adhesion of the coating. Furthermore, the chemical method proposed in JP-A No. 59-1663, in which the oxide is dissolved and removed using an acid or alkali, is extremely difficult to dissolve only the oxide, and the plating layer also dissolves, making it impractical. There wasn't.
（発明が解決しようとする問題点）
すなわち、従来の合金化溶融亜鉛めっき鋼板の製造方法
の場合、合金化熱処理炉内の雰囲気を制御することなく
大気（酸化性）雰囲気下でめっき層を合金化させていた
ため、めっき層表面に酪化被膜の生成が避けられず、そ
れが腐食環境下における塗膜ふくれや密着性劣化を招く
要因となっていたのである。本発明の目的は、酸化皮膜
が生成するという欠点を、生成後除去するといったよう
な従来技術によることなく克服できる予防手段を提供す
ること３０的とする。(Problems to be Solved by the Invention) In other words, in the conventional method for manufacturing alloyed hot-dip galvanized steel sheets, the plating layer is alloyed in an atmospheric (oxidizing) atmosphere without controlling the atmosphere in the alloying heat treatment furnace. As a result, the formation of a butyric film on the surface of the plating layer was unavoidable, leading to blistering of the paint film and deterioration of adhesion in corrosive environments. An object of the present invention is to provide preventive means that can overcome the drawback of the formation of an oxide film without using conventional techniques such as removal after formation.
（問題点を解決するための手段）
本発明は、上述のような合金化溶融亜鉛めっき鋼板の塗
装密着性を改善するために、低酸素濃度雰囲気で合金化
の加熱処理を行なえば、鋼板表面への酸化物の生成がき
わめて清浄なめつき表面を得るのに有効で、その結果優
れた塗装密着性が得られるということを知見した。(Means for Solving the Problems) The present invention provides that, in order to improve the paint adhesion of the above-mentioned alloyed hot-dip galvanized steel sheet, if alloying heat treatment is performed in a low oxygen concentration atmosphere, the surface of the steel sheet can be improved. It has been found that the formation of oxides is effective in obtaining a very clean plated surface, resulting in excellent paint adhesion.
すなわち、本発明は上述の技術的課題解決のために、
溶融亜鉛めっき浴通過後ガスワイピングを経た被めっき
鋼板を、酸素濃度５０００１）Ｉ）ｍ以下に保持した雰
囲気の合金化熱処理炉内に導き、この被めっき鋼板を５
００°Ｃ〜６００°Ｃの温度に加熱し、亜鉛めっき層を
合金化させるという手段を採用することにより、合金化
処理後のめつき層表面の酸化物生成量を抑制させ、塗装
密着性の優れた合金化溶融亜鉛めっき鋼板を製造するよ
うにしたのである。That is, in order to solve the above-mentioned technical problem, the present invention introduces a steel sheet to be plated, which has been gas-wiped after passing through a hot-dip galvanizing bath, into an alloying heat treatment furnace in an atmosphere where the oxygen concentration is maintained at 50,001)I)m or less. , this plated steel plate is 5
By adopting a method of alloying the galvanized layer by heating it to a temperature of 00°C to 600°C, the amount of oxides produced on the surface of the galvanized layer after alloying treatment is suppressed, and paint adhesion is improved. This led to the production of superior alloyed hot-dip galvanized steel sheets.
（作用）
一般に、合金化溶融亜鉛めっき向板は、連続炉により熱
処理された調板をめっき浴に浸漬してめっきした後、合
金化炉により加熱してめっき層を合金化させている。こ
の場合、ｉ板の温度は５００〜７００°Ｃに達し、合金
化熱処理炉の炉内は酪化ｇ囲気であるため、めっき表面
にＺｎやＦｅ 、 ｋｌ等のＱ化物皮膜が生成する。こ
の物質は、塗装前処理であるリン酪塩処理および塗装密
着性を劣化させることが知られており、良好な塗装密着
性を得るには何らかの手段によりこれを取り除く必要が
ある。(Function) In general, alloyed hot-dip galvanized plates are produced by plating a plate that has been heat-treated in a continuous furnace by immersing it in a plating bath, and then heating it in an alloying furnace to alloy the plated layer. In this case, the temperature of the i-plate reaches 500 to 700°C, and since the inside of the alloying heat treatment furnace is surrounded by butyric gas, a film of Q oxides such as Zn, Fe, and kl is formed on the plating surface. This substance is known to deteriorate phosphatide treatment, which is a pre-painting treatment, and paint adhesion, and must be removed by some means to obtain good paint adhesion.
この点についての従来技術は、すでに生成した酢化物を
除去する方法に向けられていた。しかしながら、従来は
酸化物生成自体の防止法について検討されたことはない
。そこで本発明においては、めっき表面の酸化皮膜生成
の抑制を目的として種々検討を行った結果、合金化時の
雰囲気および温度を制御することにより、表面Ｑ化が著
しく抑制されることを知見した。The prior art in this regard has been directed to methods of removing the acetate that has already formed. However, hitherto no studies have been conducted on methods for preventing oxide formation itself. Therefore, in the present invention, as a result of conducting various studies aimed at suppressing the formation of an oxide film on the plating surface, it was found that the surface Q formation can be significantly suppressed by controlling the atmosphere and temperature during alloying.
合金化処理炉の炉内雰囲気は、表面酸化抑制上からはで
きるだけ低敢素う度が望ましい。本発明者の知見によれ
ば、α崇濃度はｓ ｏ ｏ ｏ ｐｐｍ以下にすれば酸
化膜が生成しても実質上問題がない程度のものになるこ
とがわかった。The atmosphere in the alloying furnace is desirably as low as possible from the viewpoint of suppressing surface oxidation. According to the findings of the present inventors, it has been found that if the α concentration is set to s o o o ppm or less, there will be no substantial problem even if an oxide film is formed.
かような酸素ろ度雰囲気を制御することの他車発明にお
いて、問題になることは、酸素濃度を低下させるととも
に顕著となるめっき面からの亜鉛蒸発である。金属亜鉛
の蒸気圧は、酸化物の蒸気圧よりも著しく高く、金属表
面をおおう酸化物が少なくなるほど蒸発が激しくなる。In other inventions that involve controlling such an oxygen freeness atmosphere, the problem is that zinc evaporation from the plating surface becomes more pronounced as the oxygen concentration decreases. The vapor pressure of zinc metal is significantly higher than that of oxides, and the less oxides covering the metal surface, the more intense the evaporation.
しかも、この現象は温度と深く係わっており、高温にな
るほど蒸発が激しいが板温を適当な温度に加熱制御すれ
ば蒸発は無視できるほどになる。すなわち、その温度が
５００°Ｃ〜６００°Ｃの範囲で蒸発の抑制に有効な温
度範囲であることが判った。Moreover, this phenomenon is closely related to temperature; the higher the temperature, the more intense the evaporation, but if the plate temperature is controlled to an appropriate temperature, the evaporation can be ignored. That is, it was found that a temperature range of 500°C to 600°C is an effective temperature range for suppressing evaporation.
（実施例）
第１図は、本発明方法の実施のために用いる装置の一例
である。この図において、１はストリップ、２はスナウ
ト、ａは浴中ジンクロール、４はめつき浴、５はワイピ
ングノズルである。めっき浴に導入浸漬されてめっきを
施されたス） ＩＪツブは、ガスワイピングされた後に
合金化０７６に送り込まれる。７は板温を所定温度にす
るための誘導加熱コイルなどを好適例とする加熱手段で
あり、ストリップは５００〜６００’Ｃに加熱されて合
金化が施される。合金化炉の上端・下端に当るストリッ
プの入口および出口には、大気と遮断して雰囲気を調節
するためのシールロール８ｕ 、 ８１を設ける。そし
てガス導入口９から不活性力スを送入し、ガス排気口１
０から余剰ガスを排気することにより大気を遮断して、
ｓｏｏｏｐｐｍ以下の酸素濃度の雰囲気に保持する。(Example) FIG. 1 is an example of an apparatus used for carrying out the method of the present invention. In this figure, 1 is a strip, 2 is a snout, a is a zinc roll in a bath, 4 is a plating bath, and 5 is a wiping nozzle. The IJ tube that has been introduced into the plating bath and plated is gas wiped and then sent to alloying 076. Reference numeral 7 denotes a heating means, preferably an induction heating coil, for bringing the plate temperature to a predetermined temperature, and the strip is heated to 500 to 600'C and alloyed. Seal rolls 8u and 81 are provided at the inlet and outlet of the strip, which correspond to the upper and lower ends of the alloying furnace, to isolate the strip from the atmosphere and adjust the atmosphere. Then, inert gas is introduced from the gas inlet port 9, and the gas exhaust port 1
By exhausting excess gas from 0, the atmosphere is shut off,
The atmosphere is maintained at an oxygen concentration of sooppm or less.
なお、本発明において合金化炉６内雰囲気を構成する主
要なガス成分としては、非酸化性ガスであればいずれも
採用可能であるが、とりわけ取扱いが容易でコスト的に
も有利なＮ、とするのが最も好ましい。さらに、加熱の
ための加熱手段としては、炉内雰囲気中の酸素濃度を５
０００ ｐｐｍ以下に維持することができる方法であれ
は、いかなる方法でもさしつかえないが、輻射式加熱手
段による方法が最もよく、例えば誘導加熱コイル、レー
ザーやプラズマなどを利用した高温短時間熱処理手段も
また有効な方法である。In the present invention, any non-oxidizing gas can be used as the main gas component constituting the atmosphere inside the alloying furnace 6, but N is especially easy to handle and advantageous in terms of cost. It is most preferable to do so. Furthermore, as a heating means for heating, the oxygen concentration in the atmosphere inside the furnace is
Any method that can maintain the concentration below 0.000 ppm may be used, but radiation heating is the best method, and high-temperature short-time heat treatment using induction heating coils, lasers, plasma, etc. is also suitable. This is an effective method.
合金化熱処理実施例
深絞り月極低炭素Ｗｂ安定鋼（０・００２％Ｃ−０，２
８％Ｉｎ −０，０４％Ａｌ −０，０２１Ｎｂ
）を熱延−酸洗−冷延して板厚０．７ ｇのストリップ
とし、このストリップを無酸化炉方式の連続亜鉛めっき
ラインに通板して片面当りａｏｇ／ｍ２の亜鉛めっきｆ
？、施した後、引きつづき雰囲気ならびに加熱温度を変
えて合金化処理を行った。その後りん酸塩処理を行い、
次いで下塗り塗装としてカチオン電着塗装を施し、さら
に中塗り、上塗りを行って合計８０μｍ厚の塗装を施し
た。このめっき鋼板につきりん酸塩処理性、３コート塗
膜密Ｎ性（−次密着性および耐水密着性）を調べた。第
１表にその結果を示す。Alloying heat treatment example Deep drawing ultra-low carbon Wb stable steel (0.002%C-0.2
8%In-0,04%Al-0,021Nb
) was hot-rolled, pickled, and cold-rolled into a strip with a thickness of 0.7 g, and this strip was passed through a continuous galvanizing line using a non-oxidizing furnace method to galvanize aog/m2 per side.
? , and then alloying treatment was performed by changing the atmosphere and heating temperature. Then phosphate treatment is performed,
Next, cationic electrodeposition was applied as an undercoat, followed by an intermediate coat and a topcoat to give a total thickness of 80 μm. Phosphate treatment properties and 3-coat film adhesion properties (-substance adhesion and water resistant adhesion) of this plated steel sheet were investigated. Table 1 shows the results.
この発明から明らかなように、本発明の実施例は、従来
の大気中および強散化雰囲気における合金化処理に比べ
てりん酸塩処理性、塗装密着性が優れていることがわか
る。As is clear from the present invention, it can be seen that the examples of the present invention are superior in phosphate treatment properties and paint adhesion compared to conventional alloying treatments in the air or in a strong dispersion atmosphere.
（発明の効果）
以上説明したように本発明によれば、合金化処理時の炉
内雰囲気と温度とを制御することにより、めっき表面の
酸化膜生成が著しく抑制され、非常に優れた塗装密着性
を有する合金化溶融亜鉛めっき鋼板の製造が可能である
。(Effects of the Invention) As explained above, according to the present invention, by controlling the atmosphere and temperature in the furnace during alloying treatment, the formation of an oxide film on the plating surface is significantly suppressed, resulting in extremely excellent paint adhesion. It is possible to manufacture alloyed hot-dip galvanized steel sheets with properties.
第１図はζ本発明実施に際して用いる装置の一例を示し
た路線図である。
１・・・ストリップ ２・・・スナウト３２０．
ジンクロール １・・・めっき浴５・・・ワイピン
グノズル ６・・・合金化炉７、−・ｍｔｆＦ％手Ｒｓ
ｕ、ｓｌ・−・シールロール９・・・ガス導入口
１０・・・ガス排気口。FIG. 1 is a route map showing an example of equipment used in carrying out the present invention. 1...Strip 2...Snout 320.
Zinc roll 1... Plating bath 5... Wiping nozzle 6... Alloying furnace 7, - mtfF% hand Rs
u, sl -- Seal roll 9... Gas inlet
10...Gas exhaust port.
Claims (1)
つき鋼板を、酸素濃度５０００ｐｐｍ以下に保持した雰
囲気の合金化熱処理炉内に導き、この被めつき鋼板を５
００℃〜６００℃の温度に加熱して亜鉛めつき層を合金
化させることを特徴とする塗装密着性に優れた合金化溶
融亜鉛めつき鋼板の製造方法。1. After passing through the hot-dip galvanizing bath and gas wiping, the coated steel plate is led into an alloying heat treatment furnace with an atmosphere maintained at an oxygen concentration of 5000 ppm or less, and the coated steel plate is
A method for producing an alloyed hot-dip galvanized steel sheet with excellent paint adhesion, which comprises heating the galvanized layer to a temperature of 00°C to 600°C to alloy it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59193850A JPS6173873A (en) | 1984-09-18 | 1984-09-18 | Manufacture of alloyed hot dip galvanized steel sheet having superior adhesion to paint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59193850A JPS6173873A (en) | 1984-09-18 | 1984-09-18 | Manufacture of alloyed hot dip galvanized steel sheet having superior adhesion to paint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6173873A true JPS6173873A (en) | 1986-04-16 |
Family
ID=16314788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59193850A Pending JPS6173873A (en) | 1984-09-18 | 1984-09-18 | Manufacture of alloyed hot dip galvanized steel sheet having superior adhesion to paint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6173873A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62256959A (en) * | 1986-04-30 | 1987-11-09 | Nisshin Steel Co Ltd | Manufacture of alloying-plated steel sheet |
| JPH04224668A (en) * | 1990-12-26 | 1992-08-13 | Nisshin Steel Co Ltd | Galvannealed steel sheet |
-
1984
- 1984-09-18 JP JP59193850A patent/JPS6173873A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62256959A (en) * | 1986-04-30 | 1987-11-09 | Nisshin Steel Co Ltd | Manufacture of alloying-plated steel sheet |
| JPH04224668A (en) * | 1990-12-26 | 1992-08-13 | Nisshin Steel Co Ltd | Galvannealed steel sheet |
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