JP3093251B2 - Method of forming insulating coating on electrical steel sheet - Google Patents
Method of forming insulating coating on electrical steel sheetInfo
- Publication number
- JP3093251B2 JP3093251B2 JP02276199A JP27619990A JP3093251B2 JP 3093251 B2 JP3093251 B2 JP 3093251B2 JP 02276199 A JP02276199 A JP 02276199A JP 27619990 A JP27619990 A JP 27619990A JP 3093251 B2 JP3093251 B2 JP 3093251B2
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- Japan
- Prior art keywords
- steel sheet
- temperature
- coating
- treatment liquid
- adhesion
- Prior art date
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- Manufacturing Of Steel Electrode Plates (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ 本発明は、電磁鋼板の表面に耐食性、密着性の優れた
絶縁被膜を形成する方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for forming an insulating film having excellent corrosion resistance and adhesion on the surface of an electromagnetic steel sheet.
＜従来の技術＞ 電磁鋼板の絶縁被膜特性として、電気絶縁性、密着
性、打抜性、耐食性、耐熱性、耐薬品性および占積率な
どが優れていることが要求される。このため従来、これ
ら諸特性に対する要求を満足させるべく多くの改善が施
され、種々の組成の絶縁被膜が開発されてきた。<Conventional technology> As an insulating coating property of an electrical steel sheet, it is required that electrical insulation, adhesion, punching properties, corrosion resistance, heat resistance, chemical resistance, space factor, and the like be excellent. For this reason, conventionally, many improvements have been made to satisfy the requirements for these various properties, and insulating coatings of various compositions have been developed.
これらの絶縁被膜のうち、とくに打抜性に関しては、
有機樹脂を利用することにより著しく向上することが解
明されている。なかでもクロム酸塩ないし重クロム酸塩
と有機樹脂との混合処理液を用いた絶縁被膜は従来の無
機質被膜に比べ30〜50倍もの打抜性の向上が達成されて
おり、現在有機樹脂を含む絶縁被膜の代表として広く利
用されている。Of these insulating coatings, especially regarding the punchability,
It has been elucidated that the use of an organic resin significantly improves the performance. Above all, the insulation coating using a mixed solution of chromate or dichromate and an organic resin has achieved a 30 to 50 times improvement in punching performance compared to conventional inorganic coatings. It is widely used as a representative of the insulating film including.
ところで、一般にクロム化合物と有機樹脂との混合処
理液では、化学反応が進行するので長時間同じ状態で使
用することはできない。そのためクロム化合物に相溶
し、かつ長時間安定な混合処理液となり得る有機樹脂エ
マルジョンの選定および乳化剤の選定がなされている。
またクロム化合物中の遊離酸をできるだけなくすことも
実施されている。By the way, in general, a mixed treatment liquid of a chromium compound and an organic resin cannot be used in the same state for a long time because a chemical reaction proceeds. Therefore, an organic resin emulsion and an emulsifier which are compatible with the chromium compound and can be a stable mixed treatment liquid for a long time have been selected.
It has also been practiced to minimize free acids in chromium compounds.
＜発明が解決しようとする課題＞ しかしながら、これらクロム化合物−有機樹脂系の処
理液を電磁鋼板の表面に塗布、焼付けて絶縁被膜を形成
した場合、被膜の耐食性や密着性にバラツキが生じ、そ
の特性もかならずしも満足がいくものではなかった。<Problems to be Solved by the Invention> However, when these chromium compound-organic resin-based treatment liquids are applied to the surface of an electromagnetic steel sheet and baked to form an insulating film, the corrosion resistance and adhesion of the film vary, and the The characteristics were not always satisfactory.
被膜付着量と焼付条件が耐食性や密着性に影響を及ぼ
す因子であることは一般に知られているが、これら条件
を種々検討しても未だ耐食性と密着性のバラツキは解消
されていなかった。It is generally known that the coating amount and the baking conditions are factors that affect the corrosion resistance and the adhesion. However, even if these conditions are examined variously, the variation in the corrosion resistance and the adhesion has not been solved yet.
そこで本発明は、クロム化合物−有機樹脂系の絶縁被
膜の耐食性と密着性の改善を図ると共に特性バラツキを
なくす方法を提案することを目的とするものである。Accordingly, it is an object of the present invention to propose a method for improving the corrosion resistance and adhesion of a chromium compound-organic resin based insulating coating and eliminating characteristic variations.
＜課題を解決するための手段＞ 本発明者らは、上記の問題を解決すべく鋭意研究を重
ねた結果本発明に到達したものである。すなわち、クロ
ム化合物−有機樹脂系混合処理液を25℃以下に冷却し、
さらに塗布される電磁鋼板を25℃以下に冷却した状態で
塗布し、焼付けることによって耐食性および密着性に優
れた絶縁被膜が安定して得られることを知見したもので
ある。<Means for Solving the Problems> The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and have reached the present invention. That is, the chromium compound-organic resin-based mixed treatment liquid is cooled to 25 ° C. or less,
Further, the present inventors have found that an insulating film having excellent corrosion resistance and adhesion can be stably obtained by applying and baking the coated electromagnetic steel sheet while cooling it to 25 ° C. or less.
＜作 用＞ 本発明では、クロム化合物−有機樹脂系混合処理液を
25℃以下に冷却し、塗布される電磁鋼板を25℃以下に保
持して塗布する点に特徴がある。<Operation> In the present invention, a chromium compound-organic resin-based mixed treatment liquid is used.
It is characterized in that it is cooled to 25 ° C or less, and the applied electromagnetic steel sheet is applied while being kept at 25 ° C or less.
通常、電磁鋼板の場合、焼鈍後同一ラインでコーティ
ングされるので、この時の鋼板温度は少なくとも30〜80
℃程度であり、また余分な処理液は循環して使用してい
るので、温度の上昇は避けられない。Usually, in the case of electrical steel sheets, since the steel sheet is coated on the same line after annealing, the steel sheet temperature at this time is at least 30 to 80.
° C and excess processing solution is circulated and used, so that an increase in temperature is inevitable.
このため、ラインの状態（立上げ時、定常時等）、雰
囲気温度、季節要因等によって鋼板温度が変動し、さら
に処理液温度も変化している。For this reason, the temperature of the steel sheet fluctuates due to the state of the line (during start-up, at the time of steady state, etc.), ambient temperature, seasonal factors, and the like, and the temperature of the processing solution also fluctuates.
本発明では、この塗布前鋼板温度と処理液の温度が塗
布、焼付後に得られる被膜の耐食性と密着性に大きな影
響を与えていることを見出したものである。In the present invention, it has been found that the temperature of the steel sheet before application and the temperature of the treatment liquid have a great influence on the corrosion resistance and adhesion of the film obtained after application and baking.
クロム化合物−有機樹脂系の混合処理液温度を25℃以
下、並びに電磁鋼板温度を25℃以下に限定した理由は、
この温度以下にて処理液中の有機樹脂の最低造膜温度の
影響を無視することができるためである。The reason for limiting the temperature of the chromium compound-organic resin-based mixed treatment solution to 25 ° C or lower and the temperature of the magnetic steel sheet to 25 ° C or lower is as follows.
This is because the influence of the minimum film forming temperature of the organic resin in the processing liquid can be ignored below this temperature.
すなわち、処理液温度や鋼板温度が処理液中に配合さ
れている有機樹脂の最低造膜温度以上であると、処理液
と鋼板が接触したとき鋼板の極表層で樹脂の一部が造膜
し、その後の焼付けで被膜が形成されると、鋼板の極表
層にできた樹脂層が被膜形成後の密着性や耐食性に悪影
響を与えているものと考えられる。In other words, if the temperature of the processing solution or the temperature of the steel sheet is equal to or higher than the minimum film forming temperature of the organic resin blended in the processing solution, when the processing solution comes into contact with the steel sheet, part of the resin forms on the very surface layer of the steel sheet. If a film is formed by subsequent baking, it is considered that the resin layer formed on the extreme surface layer of the steel sheet has an adverse effect on adhesion and corrosion resistance after the film is formed.
因みに、クロム化合物−有機樹脂系の混合処理液を作
成し、処理液温度と鋼板温度を種々変えて塗布し、即水
洗した後乾燥した。鋼板表面をＸ線マイクロアナライザ
ーにて分析すると、処理液温度と鋼板温度が処理液中に
配合された有機樹脂の最低造膜温度以上の場合、Ｃ（炭
素）が確認され最低造膜温度以下だとＣが認められなか
ったことからもわかる。Incidentally, a mixed treatment liquid of a chromium compound-organic resin system was prepared, applied by changing the treatment liquid temperature and the steel plate temperature variously, immediately washed with water, and then dried. When the surface of the steel sheet is analyzed with an X-ray microanalyzer, when the processing liquid temperature and the steel sheet temperature are higher than the minimum film forming temperature of the organic resin compounded in the processing liquid, C (carbon) is confirmed and is lower than the minimum film forming temperature. And C were not recognized.
本発明でいうところのクロム化合物−有機樹脂系絶縁
被膜について説明する。The chromium compound-organic resin-based insulating coating according to the present invention will be described.
被膜処理液としては、Zn、Ca、Mg、Alなどの１種また
は２種以上を含むクロム酸塩、重クロム酸塩、あるいは
これに無水クロム酸を加えた水溶液が主剤として好適に
用いられる。As the coating solution, a chromate or a bichromate containing one or more of Zn, Ca, Mg, Al and the like, or an aqueous solution obtained by adding chromic anhydride thereto is preferably used as a main agent.
この主剤に有機樹脂のエマルジョンを配合するわけで
あるが、その種類として、アクリル、スチレン、酢酸ビ
ニル、ベオバ、エチレン、エポキシ、その他の単独また
は２種以上の共重合物で、上記クロム化合物水溶液に安
定して相溶するものが好適である。An emulsion of an organic resin is blended with this base material, and the types thereof are acrylic, styrene, vinyl acetate, veoba, ethylene, epoxy, and other single or two or more copolymers. Those that are stable and compatible are preferred.
さらに６価クロムの還元剤が加えられるが、エチレン
グリコール、グリセリン、ショ糖、ブドウ糖などの多価
アルコール類が有利に適合する。また、アミン、カルボ
ン酸などを用いても良い。以上の成分の他被膜の耐熱性
や絶縁性を向上させるため、硼酸、リン酸塩、硅酸塩あ
るいはAl2O3、SiO2、TiO2など酸化物微粉末を添加して
もよい。Further, a hexavalent chromium reducing agent is added, and polyhydric alcohols such as ethylene glycol, glycerin, sucrose, glucose and the like are advantageously suitable. Further, an amine, a carboxylic acid, or the like may be used. In addition to the above components, a boric acid, a phosphate, a silicate, or an oxide fine powder such as Al 2 O 3 , SiO 2 or TiO 2 may be added in order to improve the heat resistance and the insulating property of the coating.
以上に述べた配合の処理液を電磁鋼板の表面に均一に
塗布するわけであるが、塗布方法は、浸漬法やロールコ
ータ法等、従来公知のいずれの方法をも使用することが
できる。処理液を均一に塗布された鋼板は引続いて焼付
けられ被膜形成を完了する。この時の処理液温度は25℃
以下であり、かつ鋼板温度も25℃以下である。なお、鋼
板温度を25℃以下とした場合、周辺雰囲気の状態により
鋼板表面で結露することがあり、注意が必要である。The treatment liquid having the above-described composition is uniformly applied to the surface of the magnetic steel sheet. As the application method, any conventionally known method such as a dipping method or a roll coater method can be used. The steel sheet uniformly coated with the treatment liquid is subsequently baked to complete the film formation. The temperature of the processing solution at this time is 25 ° C
Or less, and the steel sheet temperature is 25 ° C. or less. When the temperature of the steel sheet is set to 25 ° C. or less, dew may be formed on the surface of the steel sheet depending on the state of the surrounding atmosphere.
得られた被膜の付着量は0.3g/m2よりも少ないと良好
な打抜性が得難く、6g/m2よりも多いと被膜の密着性が
劣化するため、0.3〜6g/m2程度とするのが望ましい。Adhesion amount of the resulting coating is less good punching property than 0.3 g / m 2 difficult to obtain, since often the adhesion of the coating than 6 g / m 2 is deteriorated, 0.3~6g / m 2 about It is desirable that
以下、実施例により説明する。 Hereinafter, an embodiment will be described.
＜実施例＞ 実施例１ 板厚0.5mmの電磁鋼板の表面に下記の成分からなる処
理液Ａをロールコータ法により塗布した後、450℃の熱
風炉にて70秒間焼付けて、該鋼板表面に絶縁被膜を形成
した。このときの処理液温度は20℃であり、電磁鋼板温
度は20℃であった。<Example> Example 1 A treatment liquid A comprising the following components was applied to the surface of a 0.5 mm-thick electromagnetic steel sheet by a roll coater method, and then baked in a hot-air oven at 450 ° C. for 70 seconds to form a coating on the surface of the steel sheet. An insulating film was formed. At this time, the temperature of the treatment liquid was 20 ° C., and the temperature of the magnetic steel sheet was 20 ° C.
被膜付着量は0.8g/m2であり、均一な被膜が得られ、
耐食性、密着性は良好であった。その他被膜特性は表１
に示したとおりである。Coating deposition amount was 0.8 g / m 2, uniform coatings were obtained,
The corrosion resistance and adhesion were good. Other coating properties are shown in Table 1.
As shown in FIG.
30％重クロム酸マグネシウム溶液 130重量部 アクリル−酢酸ビニル樹脂エマルジョン 30重量部 （樹脂固形分:50％、最低造膜温度:22℃） エチレングリコール 10重量部 硼酸 10重量部 実施例２ 板厚0.5mmの電磁鋼板の表面に前記の成分からなる処
理液Ａをロールコータ法により塗布した後、450℃の熱
風炉にて70秒間焼付けて、該鋼板表面に絶縁被膜を形成
した。このときの処理液温度は15℃であり、電磁鋼板温
度は20℃であった。30% magnesium dichromate solution 130 parts by weight Acrylic-vinyl acetate resin emulsion 30 parts by weight (resin solids: 50%, minimum film forming temperature: 22 ° C) Ethylene glycol 10 parts by weight Boric acid 10 parts by weight Example 2 Sheet thickness 0.5 The treatment liquid A comprising the above-mentioned components was applied to the surface of a magnetic steel sheet having a thickness of 1 mm by a roll coater method, and then baked in a hot air oven at 450 ° C. for 70 seconds to form an insulating film on the surface of the steel sheet. At this time, the temperature of the treatment liquid was 15 ° C., and the temperature of the magnetic steel sheet was 20 ° C.
被膜付着量は0.8g/m2であり、均一な被膜が得られ、
耐食性、密着性は良好であった。その他被膜特性は表１
に示したとおりである。Coating deposition amount was 0.8 g / m 2, uniform coatings were obtained,
The corrosion resistance and adhesion were good. Other coating properties are shown in Table 1.
As shown in FIG.
実施例３ 板厚0.5mmの電磁鋼板の表面に下記の成分からなる処
理液Ｂをロールコータ法により塗布した後、450℃の熱
風炉にて70秒間焼付けて、該鋼板表面に絶縁被膜を形成
した。このときの処理液温度は20℃であり、電磁鋼板温
度は25℃であった。Example 3 A treatment liquid B comprising the following components was applied to the surface of a 0.5 mm-thick electromagnetic steel sheet by a roll coater method, and then baked in a hot-air oven at 450 ° C. for 70 seconds to form an insulating film on the surface of the steel sheet. did. At this time, the temperature of the treatment liquid was 20 ° C., and the temperature of the magnetic steel sheet was 25 ° C.
被膜付着量は2.5g/m2であり、均一な被膜が得られ、
耐食性、密着性は良好であった。その他被膜特性は表１
に示したとおりである。Coating deposition amount was 2.5 g / m 2, uniform coatings were obtained,
The corrosion resistance and adhesion were good. Other coating properties are shown in Table 1.
As shown in FIG.
30％重クロム酸カルシウム溶液 130重量部 酢酸ビニル−ベオバ樹脂エマルジョン 30重量部 （樹脂固形分:50％、最低造膜温度:18℃） エチレングリコール 10重量部 硼酸 10重量部 実施例４ 板厚0.5mmの電磁鋼板の表面に前記の成分からなる処
理液Ｂをロールコータ法により塗布した後、450℃の熱
風炉にて70秒間焼付けて、該鋼板表面に絶縁被膜を形成
した。このときの処理液温度は15℃であり、電磁鋼板温
度は15℃であった。30% calcium dichromate solution 130 parts by weight Vinyl acetate-veova resin emulsion 30 parts by weight (resin solid content: 50%, minimum film formation temperature: 18 ° C) Ethylene glycol 10 parts by weight Boric acid 10 parts by weight Example 4 Sheet thickness 0.5 The treatment liquid B comprising the above-mentioned components was applied to the surface of an electromagnetic steel sheet having a thickness of mm by a roll coater method, and then baked in a hot air oven at 450 ° C. for 70 seconds to form an insulating film on the surface of the steel sheet. At this time, the temperature of the treatment liquid was 15 ° C., and the temperature of the magnetic steel sheet was 15 ° C.
被膜付着量は2.5g/m2であり、均一な被膜が得られ、
耐食性、密着性は良好であった。その他被膜特性は表１
に示したとおりである。Coating deposition amount was 2.5 g / m 2, uniform coatings were obtained,
The corrosion resistance and adhesion were good. Other coating properties are shown in Table 1.
As shown in FIG.
比較例１ 板厚0.5mmの電磁鋼板の表面に前記の成分からなる処
理液Ａをロールコータ法により塗布した後、450℃の熱
風炉にて70秒間焼付けて、該鋼板表面に絶縁被膜を形成
した。このときの処理液温度は20℃であり、電磁鋼板温
度は30℃であった。Comparative Example 1 A treatment liquid A comprising the above-described components was applied to the surface of a 0.5 mm-thick electromagnetic steel sheet by a roll coater method, and then baked in a hot air oven at 450 ° C. for 70 seconds to form an insulating film on the steel sheet surface. did. At this time, the temperature of the treatment liquid was 20 ° C., and the temperature of the magnetic steel sheet was 30 ° C.
被膜付着量は0.8g/m2であり、均一な被膜が得られた
が、耐食性、密着性は劣った。その他被膜特性は表１に
示したとおりである。The coating weight was 0.8 g / m 2 , and a uniform coating was obtained, but the corrosion resistance and adhesion were poor. Other coating properties are as shown in Table 1.
比較例２ 板厚0.5mmの電磁鋼板の表面に前記の成分からなる処
理液Ａをロールコータ法により塗布した後、450℃の熱
風炉にて70秒間焼付けて、該鋼板表面に絶縁被膜を形成
した。このときの処理液温度は20℃であり、電磁鋼板温
度は60℃であった。Comparative Example 2 A treatment liquid A comprising the above-described components was applied to the surface of a 0.5 mm-thick electromagnetic steel sheet by a roll coater method, and then baked in a hot-air oven at 450 ° C. for 70 seconds to form an insulating film on the steel sheet surface. did. At this time, the temperature of the treatment liquid was 20 ° C., and the temperature of the magnetic steel sheet was 60 ° C.
被膜付着量は0.8g/m2であり、均一な被膜が得られた
が、耐食性、密着性は劣った。その他被膜特性は表１に
示したとおりである。The coating weight was 0.8 g / m 2 , and a uniform coating was obtained, but the corrosion resistance and adhesion were poor. Other coating properties are as shown in Table 1.
比較例３ 板厚0.5mmの電磁鋼板の表面に前記の成分からなる処
理液Ａをロールコータ法により塗布した後、450℃の熱
風炉にて70秒間焼付けて、該鋼板表面に絶縁被膜を形成
した。このときの処理液温度は30℃であり、電磁鋼板温
度は20℃であった。Comparative Example 3 A treatment liquid A comprising the above-mentioned components was applied to the surface of a 0.5 mm-thick electromagnetic steel sheet by a roll coater method, and then baked in a hot-air oven at 450 ° C. for 70 seconds to form an insulating film on the steel sheet surface. did. At this time, the temperature of the treatment liquid was 30 ° C., and the temperature of the magnetic steel sheet was 20 ° C.
被膜付着量は0.8g/m2であり、均一な被膜が得られた
が、耐食性、密着性は劣った。その他被膜特性は表１に
示したとおりである。The coating weight was 0.8 g / m 2 , and a uniform coating was obtained, but the corrosion resistance and adhesion were poor. Other coating properties are as shown in Table 1.
比較例４ 板厚0.5mmの電磁鋼板の表面に前記の成分からなる処
理液Ｂをロールコータ法により塗布した後、450℃の熱
風炉にて70秒間焼付けて、該鋼板表面に絶縁被膜を形成
した。このときの処理液温度は30℃であり、電磁鋼板温
度は30℃であった。Comparative Example 4 A treatment liquid B comprising the above components was applied to the surface of a 0.5 mm-thick electromagnetic steel sheet by a roll coater method, and then baked in a hot-air oven at 450 ° C. for 70 seconds to form an insulating film on the steel sheet surface. did. At this time, the temperature of the treatment liquid was 30 ° C., and the temperature of the magnetic steel sheet was 30 ° C.
被膜付着量は3.5g/m2であり、均一な被膜が得られた
が、耐食性、密着性は劣った。その他被膜特性は表１に
示したとおりである。The coating weight was 3.5 g / m 2 , and a uniform coating was obtained, but the corrosion resistance and adhesion were poor. Other coating properties are as shown in Table 1.
比較例５ 板厚0.5mmの電磁鋼板の表面に前記の成分からなる処
理液Ｂをロールコータ法により塗布した後、450℃の熱
風炉にて70秒間焼付けて、該鋼板表面に絶縁被膜を形成
した。このときの処理液温度は20℃であり、電磁鋼板温
度は60℃であった。Comparative Example 5 A treatment liquid B comprising the above components was applied to the surface of a 0.5 mm-thick electromagnetic steel sheet by a roll coater method, and then baked in a hot-air oven at 450 ° C. for 70 seconds to form an insulating film on the steel sheet surface. did. At this time, the temperature of the treatment liquid was 20 ° C., and the temperature of the magnetic steel sheet was 60 ° C.
被膜付着量は3.5g/m2であり、均一な被膜が得られた
が、耐食性、密着性は劣った。その他被膜特性は表１に
示したとおりである。The coating weight was 3.5 g / m 2 , and a uniform coating was obtained, but the corrosion resistance and adhesion were poor. Other coating properties are as shown in Table 1.
＜発明の効果＞ 以上述べたように、この発明によれば、クロム化合物
−有機樹脂系混合処理液を25℃以下として、かつ25℃以
下に保持した電磁鋼板に塗布することによって、耐食性
および密着性の優れた絶縁被膜を得ることができる。 <Effects of the Invention> As described above, according to the present invention, the chromium compound-organic resin-based mixed treatment liquid is applied to a magnetic steel sheet kept at 25 ° C or less and kept at 25 ° C or less, whereby the corrosion resistance and the adhesion are improved. An insulating film having excellent properties can be obtained.
フロントページの続き (72)発明者 貞頼 捷雄 千葉県千葉市川崎町１番地 川崎製鉄株 式会社技術研究本部内 (56)参考文献 特開 昭51−5241（ＪＰ，Ａ) 特開 昭56−81681（ＪＰ，Ａ) 特開 昭59−215489（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 22/00 - 22/86 B05D 7/14 B32B 15/08 Continuation of the front page (72) Inventor Katsuo Sadayori 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Corporation Technology Research Division (56) References JP-A-51-5241 (JP, A) JP-A-56- 81681 (JP, A) JP-A-59-215489 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C23C 22/00-22/86 B05D 7/14 B32B 15/08
Claims (1)
ム化合物−有機樹脂系の処理液を塗布し、次いで焼付け
し絶縁被膜を形成する方法において、該処理液の温度を
25℃以下の状態にして、25℃以下に保持された該電磁鋼
板の表面に塗布することを特徴とする電磁鋼板絶縁被膜
の形成方法。1. A method of applying a chromium compound-organic resin-based treatment liquid to the surface of an electrical steel sheet having undergone a final annealing step, followed by baking to form an insulating film.
A method for forming an insulating coating on an electromagnetic steel sheet, wherein the coating is applied to the surface of the electromagnetic steel sheet kept at a temperature of 25 ° C. or less in a state of 25 ° C. or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02276199A JP3093251B2 (en) | 1990-10-17 | 1990-10-17 | Method of forming insulating coating on electrical steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02276199A JP3093251B2 (en) | 1990-10-17 | 1990-10-17 | Method of forming insulating coating on electrical steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04154972A JPH04154972A (en) | 1992-05-27 |
| JP3093251B2 true JP3093251B2 (en) | 2000-10-03 |
Family
ID=17566069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02276199A Expired - Fee Related JP3093251B2 (en) | 1990-10-17 | 1990-10-17 | Method of forming insulating coating on electrical steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3093251B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11230481A (en) * | 1998-02-16 | 1999-08-27 | Mitsubishi Materials Corp | Manufacture of inner surface plated copper tube |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2832670B1 (en) * | 2001-11-27 | 2004-09-24 | Sarl Lb De La Rosiere | OBJECT DECORATION PROCESS AND DEVICE FOR ITS IMPLEMENTATION |
| DE60336300D1 (en) | 2002-01-28 | 2011-04-21 | Jfe Steel Corp | METHOD FOR PRODUCING A COATED STEEL PLATE |
-
1990
- 1990-10-17 JP JP02276199A patent/JP3093251B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11230481A (en) * | 1998-02-16 | 1999-08-27 | Mitsubishi Materials Corp | Manufacture of inner surface plated copper tube |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04154972A (en) | 1992-05-27 |
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