JPS6384671A - Insulating film of electrical steel sheet and formation thereof - Google Patents
Insulating film of electrical steel sheet and formation thereofInfo
- Publication number
- JPS6384671A JPS6384671A JP22831186A JP22831186A JPS6384671A JP S6384671 A JPS6384671 A JP S6384671A JP 22831186 A JP22831186 A JP 22831186A JP 22831186 A JP22831186 A JP 22831186A JP S6384671 A JPS6384671 A JP S6384671A
- Authority
- JP
- Japan
- Prior art keywords
- insulating film
- electrical steel
- steel sheet
- less
- alkali metal
- 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
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 14
- 230000015572 biosynthetic process Effects 0.000 title description 2
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 24
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 22
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 22
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 21
- 150000002367 halogens Chemical class 0.000 claims abstract description 19
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 239000011651 chromium Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 11
- 238000000137 annealing Methods 0.000 abstract description 12
- 239000007788 liquid Substances 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 10
- 239000000839 emulsion Substances 0.000 abstract description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 abstract description 7
- 239000002585 base Substances 0.000 abstract description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 abstract description 3
- 239000004327 boric acid Substances 0.000 abstract description 3
- 239000011777 magnesium Substances 0.000 abstract description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 abstract description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052749 magnesium Inorganic materials 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 229910001413 alkali metal ion Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 150000001642 boronic acid derivatives Chemical class 0.000 description 2
- 150000001845 chromium compounds Chemical class 0.000 description 2
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- -1 halogen ions Chemical class 0.000 description 2
- 239000002075 main ingredient Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 241000316889 Pulvinaria vitis Species 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910001854 alkali hydroxide Inorganic materials 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000013583 drug formulation Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- CRGGPIWCSGOBDN-UHFFFAOYSA-N magnesium;dioxido(dioxo)chromium Chemical compound [Mg+2].[O-][Cr]([O-])(=O)=O CRGGPIWCSGOBDN-UHFFFAOYSA-N 0.000 description 1
- GIOZLVMCHDGNNZ-UHFFFAOYSA-N magnesium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium Chemical compound [Mg+2].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O GIOZLVMCHDGNNZ-UHFFFAOYSA-N 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、電磁鋼板の表面に処理される絶縁皮膜および
その形成方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an insulating film treated on the surface of an electrical steel sheet and a method for forming the same.
〈従来の技術〉
電磁鋼板の絶縁皮膜に要求される特性は、電気絶縁性、
密着性、打抜性、溶接性、耐熱性および耐薬品性など多
岐にわたり、従来からこれらの緒特性を満たすべく数多
くの研究が行われてきた。<Conventional technology> The properties required for the insulating film of electrical steel sheets are electrical insulation,
Numerous studies have been conducted to satisfy a wide range of properties, including adhesion, punchability, weldability, heat resistance, and chemical resistance.
中でも打抜き加工を経て使用される場合には、当然のこ
となから打抜性が特に重視される。近年、クロム酸塩と
を機樹脂との混合液を塗付、焼き付けすることにより、
打抜性が著しく向上することが確められ、例えば特開昭
６０−１９０５７２号公報や特開昭６０−３８０６８号
公報、特公昭５０−１５０１３号公報などにおいて、そ
の具体的技術が開示されている。In particular, when the material is to be used after being punched, punchability is of course particularly important. In recent years, by applying and baking a mixture of chromate and machine resin,
It has been confirmed that punching performance is significantly improved, and specific techniques thereof have been disclosed, for example, in JP-A-60-190572, JP-A-60-38068, and JP-A-50-15013. There is.
〈発明が解決しようとする問題点〉
しかしながら、上記方法による絶縁皮膜を処理した電磁
鋼板に歪取り焼鈍を施した場合、大気中に放置している
だけで、銹を生ずるという問題が往々にして起る。<Problems to be Solved by the Invention> However, when strain-relief annealing is applied to an electrical steel sheet treated with an insulating film by the above method, there is often a problem that rust occurs even if it is left in the atmosphere. It happens.
電磁鋼板は、通常モータや変圧器の鉄心の形状に打抜か
れ、かつ磁性を向上させるために歪取り焼鈍を施した後
、次の工程に入るまでに数日間ないしは輸送などの関係
で数十日間、裸あるいはＰＪ易梱包の形で仮置きされる
。このとき、周囲の環境条件すなわち温度や湿度の変化
によって、往々にして銹を生ずるのである。Electrical steel sheets are usually punched into the shape of the iron core of a motor or transformer, and after being subjected to strain relief annealing to improve magnetism, they are processed for several days or several tens of days during transportation before entering the next process. , temporarily stored naked or in PJ-packaged form. At this time, changes in surrounding environmental conditions, such as temperature and humidity, often cause rust.
この理由は、絶縁皮膜が塗布、焼き付けされたままの状
態では、クロメートと樹脂の複合皮膜がバリヤ効果を発
揮して優れた耐食性を示すのであるが、７００〜８５０
℃で歪取り焼鈍を行うと、絶縁皮膜中の樹脂の大部分が
熱分解してしまい、絶縁皮膜に無数のピンホールやクラ
ンクを生ずるから、バリヤ効果が消失して空気中の水分
によって容易に発語を起すことになるのである。The reason for this is that when the insulating film is applied and baked, the composite film of chromate and resin exhibits a barrier effect and exhibits excellent corrosion resistance.
If strain relief annealing is performed at ℃, most of the resin in the insulation film will thermally decompose, resulting in countless pinholes and cranks in the insulation film, which will cause the barrier effect to disappear and be easily removed by moisture in the air. This will cause speech to occur.
発語した電磁鋼板は・、当然のことながら使用に耐える
ものではなく、経済的損失は大きいのである。The electromagnetic steel sheets mentioned above are, of course, not durable enough to withstand use, and the economic loss is large.
本発明は、上記の問題点に鑑みなされたものであって、
歪取り焼鈍後においても耐食性の良好なりロム化合物−
打機樹脂系の絶縁皮膜を得ることを目的とする。The present invention has been made in view of the above problems, and includes:
ROM compound with good corrosion resistance even after strain relief annealing
The purpose is to obtain a perforator resin-based insulating film.
〈問題点を解決するため手段〉
本発明は、電磁鋼板の表面に処理されるクロム化合物−
有機樹脂系絶縁皮膜であって、該絶縁皮膜中のハロゲン
元素が０．０２ｗＬ％以下、およびアルカリ金属が０．
０Ｅｈｔ％以下である電磁綱板絶縁皮膜であ、す、また
、電ｆｉｆ鋼板の表面にクロム化合物−有機樹脂系絶縁
皮膜を形成するに当り、ハロゲン元素が１０ｐｐｍ以下
およびアルカリ金属が４０Ｐρｍ以下である処理液を塗
布、焼き付けして絶縁皮膜を形成する電磁口板絶縁皮膜
の形成方法である。<Means for Solving the Problems> The present invention provides a method for treating the surface of an electrical steel sheet with a chromium compound.
An organic resin-based insulating film containing 0.02 wL% or less of a halogen element and 0.02 wL% or less of an alkali metal.
The electromagnetic steel plate insulating coating has a content of 0 Eht% or less.Also, when forming a chromium compound-organic resin based insulating coating on the surface of an electric FIF steel plate, the halogen element content is 10 ppm or less and the alkali metal content is 40 Pρm or less. This is a method for forming an electromagnetic mouth plate insulating film by coating and baking a treatment liquid to form an insulating film.
く作 用〉
本発明は、クロム化合物−有機樹脂系絶縁皮膜の歪取り
焼鈍後の耐食性向上をはかるべく、皮膜成分の影響を種
々検討した結果、耐食性の優れた皮膜組成としては、ハ
ロゲン元素を０．０２％以下、およびアルカリ金属を０
．０８％以下にすればよいことを見出したのである。す
なわち、皮膜中においてハロゲン元素およびアルカリ金
属の濃度が、これ以上になると容易に銹を発生するよう
になる。Effects of the present invention In order to improve the corrosion resistance of a chromium compound-organic resin-based insulating film after strain relief annealing, we have conducted various studies on the effects of film components. 0.02% or less and 0 alkali metals
．． They found that it is sufficient to reduce the amount to 0.8% or less. That is, if the concentration of halogen elements and alkali metals in the film exceeds this range, rust will easily occur.
この理由は、ハロゲン元素はＦｅ面をアタックする腐食
性イオンの故であり、また、アルカリ金属はハロゲン元
素とともに腐食電流の抵抗を下げ、さらに吸湿性を助長
させ得ることによるものであると考えられる。The reason for this is thought to be that the halogen element is a corrosive ion that attacks the Fe surface, and that the alkali metal together with the halogen element lowers the resistance of corrosion current and can further promote hygroscopicity. .
ところで、通常のクロム化合物−打機樹脂系膜は、以下
に述べるように、多くのハロゲン元素やアルカリ金属を
含むのである。まず、コーテイング液の主剤としてクロ
ム酸塩、または重クロム酸塩を用いるが、これらの中に
ｉｔながらも一定のハロゲン元素およびアルカリ金属を
含む。特にマグネシウムのクロム酸塩の場合、原料のＭ
ｇ（ＯＨ）□は、海水から採取されるので、ハロゲン元
素やアルカリ金属が高濃度になりやすい。By the way, a typical chromium compound-pulver resin film contains many halogen elements and alkali metals, as described below. First, chromate or dichromate is used as the main ingredient of the coating liquid, and although it is a chromate, it contains certain halogen elements and alkali metals. Especially in the case of magnesium chromate, the raw material M
Since g(OH)□ is collected from seawater, it tends to have high concentrations of halogen elements and alkali metals.
また、もう一方の主要な薬剤である水溶性あるいはエマ
ルジョンの形態の存機樹脂も、重合触媒としてハロゲン
化合物を用いてつくられるものがあるが、このようなも
のには、ハロゲン元素を多く含むことになる。In addition, water-soluble or emulsion-based organic resins, which are the other main agent, are also made using halogen compounds as polymerization catalysts, but these materials contain a large amount of halogen elements. Become.
さらに、樹脂エマルジョン中に含まれる乳化剤やｐＨｊ
Ｊ！整剤、中和剤には、アルカリ金属を含む界面活性剤
やアルカリ金属の炭酸塩、水酸化物が多く用いられる。Furthermore, the emulsifier contained in the resin emulsion and the pH
J! Surfactants containing alkali metals and alkali metal carbonates and hydroxides are often used as conditioners and neutralizing agents.
このため、エマルジョン中のアルカリ金属γ；度は通常
数１００ρρｍ以上であることから、皮膜中で？：６７
ＨＪｆとなりやすい。For this reason, since the alkali metal gamma degree in the emulsion is usually more than several hundred ρρm, the degree of alkali metal γ in the film is ? :67
It is easy to become HJf.
また、皮膜には硼酸塩その他耐熱性の添加物も添加され
るが、これらからも、ハロゲン元素やアルカリ金属が混
入される可能性がある。さらに、薬剤調合からコーテイ
ング液の稀釈に至るまで、各段階で使用される水からも
これらは混入する可能性をもつのである。In addition, borates and other heat-resistant additives are added to the film, but there is a possibility that halogen elements and alkali metals may be mixed in from these as well. Additionally, these substances can be introduced from the water used at each step, from drug formulation to coating dilution.
そこで、本発明の絶縁皮膜の組成を得るには、以上に述
べた処理液構成成分のすべてについて、ハロゲン元素や
アルカリ金属の少ないものを選択するか、あるいは減ら
す措置をとらなければならない０例えば、前記のＭｇ（
ＯＨ）、の純度を上げるには、ＭｇＯへの焼成と再水和
を繰返す方法が有効である。また、樹脂エマルジョンで
広範に用いられるところのアルカリ金属を含む乳化剤や
ｐＨｍ整剤は、エマルジョンの特性を損わない適切なア
ンモニウム塩などによって代替される。また、使用すろ
水、その他の薬剤については、イオン交換法がハロゲン
元素やアルカリ金属を除去するために有効である。Therefore, in order to obtain the composition of the insulating film of the present invention, it is necessary to select or take measures to reduce the amount of halogen elements and alkali metals in all of the processing liquid components described above. The above Mg (
In order to increase the purity of OH), it is effective to repeat calcination to MgO and rehydration. Furthermore, emulsifiers and pH adjusters containing alkali metals, which are widely used in resin emulsions, can be replaced with suitable ammonium salts that do not impair the properties of the emulsion. In addition, ion exchange method is effective for removing halogen elements and alkali metals from the filtered water and other chemicals used.
上記のような対策をとった薬剤等によって調合した処理
液は、ハロゲン元素を１０ｐｐｍ以下、およびアルカリ
金属を４０ｐｐｍ以下にしなければならず、これら以上
の濃度になると、形成した絶縁皮膜中のハロゲン元素や
アルカリ金属が増えるから歪取り焼鈍後の耐食性は劣化
する。The treatment solution prepared using chemicals that take the above measures must contain halogen elements at 10 ppm or less and alkali metal at 40 ppm or less.If the concentration exceeds these concentrations, halogen elements in the formed insulating film will be removed. Corrosion resistance after strain relief annealing deteriorates due to the increase in the amount of aluminum and alkali metals.
以下に、本発明でいうところのクロム化合物−有機樹脂
系絶縁皮膜について説明する。The chromium compound-organic resin insulating film referred to in the present invention will be explained below.
皮膜処理液としてはＺｎ、Ｃａ、Ｍｇ、Ａｉ’。Film treatment liquids include Zn, Ca, Mg, and Ai'.
ｃｄ、等の１種または２種以上を含む、重クロム酸塩、
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。dichromate, containing one or more types of cd, etc.
Chromate or an aqueous solution of chromic acid anhydride is preferably used as the main ingredient.
この主剤に水溶性またはエマルジョンの有機樹脂を添加
するわけであるが、その種類としては、アクリル・、ス
チレン、酢酸ビニール、ベオバ、エチレン、エポキシ、
フェノール、アルキツド、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乳化
するものが好適である。A water-soluble or emulsion organic resin is added to this base resin, and the types include acrylic, styrene, vinyl acetate, beoba, ethylene, epoxy,
Phenols, alkyds, and other substances alone or copolymers of two or more thereof, which are stably emulsified in the aqueous solution of the chromium compound, are suitable.
さらに６価クロムの還元剤が加えられるが、これはエチ
レングリコール、グリセリン、ショネノと、ブドウ垢等
の多価アルコール類が存利に適合する。Furthermore, a reducing agent of hexavalent chromium is added, and ethylene glycol, glycerin, alcohol, and polyhydric alcohols such as grape scale are suitable for this.
また、アミン、カルボン酸等を用いてもよい０以上の成
分の他、皮膜の耐熱性や絶縁抵抗を向上ささせるため、
硼酸や硼酸塩、燐酸塩その他の耐熱性ガラス皮膜を生成
する化合物あるいは酸化物微粒子ないしは酸化物微粒子
を生成するような化合物を添加してもよい。In addition to zero or more components that may include amines, carboxylic acids, etc., in order to improve the heat resistance and insulation resistance of the film,
Boric acid, borates, phosphates, and other compounds that produce heat-resistant glass coatings or oxide fine particles or compounds that produce oxide fine particles may be added.
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、塗布方法としては、ロールコータ
−法や浸漬法等、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
いて焼き付は処理され、皮膜形成を完了する。なお、焼
き付は後の皮膜付着量は、０．３ｇ／ ｃｄよりも少な
いと、良好な打抜き性が得難り、一方、８ｇ／ｎ？より
も多いと皮膜の密着性が劣化するため、０．３〜８ｇ／
ｎ？程度とするのが好ましい。The treatment liquid with the above-mentioned composition is applied uniformly to the surface of the electrical steel sheet, and any conventionally known method such as the roll coater method or the dipping method can be used for the application. can. The steel plate that has been uniformly coated with the treatment liquid is then subjected to baking treatment to complete the film formation. It should be noted that if the amount of film deposited after burning is less than 0.3 g/cd, it is difficult to obtain good punching properties, whereas if it is less than 8 g/n? If the amount is more than 0.3~8g/, the adhesion of the film will deteriorate.
n? It is preferable to set it as approximately.
〈実施例〉 以下に本発明の実施例について具体的に説明する。<Example> Examples of the present invention will be specifically described below.
冷間圧延一連続焼鈍された板厚０．５ｍｍで５ｉＯ５３
、％含有の無方向性珪素鋼板に、下記の処理液をウェッ
ト膜厚１５ｇ／ｒ＋７、乾燥膜厚０．８ｇ／ｍの塗布鼠
で塗布し、４５０℃で焼き付けた。5iO53 with cold rolling and continuous annealing plate thickness 0.5mm
The following treatment solution was applied to a non-oriented silicon steel plate containing .
［処理液コ
０３０％重クロムりマグネシウム水ｉ８液１３０ 重
量部
０アクリル−酢酸ビニール樹脂エマルジョン（樹脂固形
分５０％）２５ 重量部
０エチレングリコール ７ 重量部０硼 酸
１０ 重量部この場合、主
剤である重クロム酸マグネシウムおよび使用する水の純
度を種々変更し、処理液中のハロゲンイオン（ｆｌ−、
Ｆ−）およびアルカリ金属イオン（Ｎａ’ 、 Ｋ
” ）の濃度を第１表に示すように変化させた。なお、
樹脂エマルジョンは、ハロゲンイオン（Ｃｊ−）： ２
ｐρｍ以下、アルカリ金属イオン（Ｎａ” 、 Ｋ
” ） ：２３０ρρ脂と高純度のものを用いた。[Treatment liquid 030% dichromium dimagnesium water I8 liquid 130 parts by weight 0 acrylic-vinyl acetate resin emulsion (resin solid content 50%) 25 parts by weight 0 ethylene glycol 7 parts by weight 0 boric acid 10 parts by weight In this case, the main agent By variously changing the purity of certain magnesium dichromate and the water used, the halogen ions (fl-,
F-) and alkali metal ions (Na', K
” ) concentration was varied as shown in Table 1.
The resin emulsion contains halogen ions (Cj-): 2
pρm or less, alkali metal ions (Na”, K
): 230ρρ fat and high purity were used.
このようにして、コーティングした後の？ｉｉ Ｆａ
Ｅ板を剪断した後、結束した状態で、Ｎ２雰囲気中で７
５０℃Ｘ２ｈの歪取り焼鈍を行なった。その後、皮膜の
耐食性を判定するために、底部に水を入れた密封容器中
に１５日間放置し、発錆状態を調べた。After coating in this way? ii Fa
After shearing the E plate, it was tied together and then heated in a N2 atmosphere for 7 days.
Strain relief annealing was performed at 50°C for 2 hours. Thereafter, in order to determine the corrosion resistance of the film, it was left in a sealed container with water in the bottom for 15 days, and the state of rust was examined.
この結果を第１表に併せて示した。The results are also shown in Table 1.
この実施例から明らかなように、本発明の範囲外である
比較例は発錆が著しいのにくらべ、本発明の方法はいず
れも発錆が発錆面積比で５％以下と少なく、歪取り焼鈍
後の耐食性がきわめて効果的に改善されている。As is clear from this example, compared to the comparative example which is outside the scope of the present invention, where rusting is significant, the method of the present invention has less rusting of 5% or less in terms of the rusted area ratio, and the distortion is removed. Corrosion resistance after annealing is improved very effectively.
〈発明の効果〉
以上説明したように、本発明によれば、電Ｍ１調板の表
面にクロム化合物−有機樹脂系絶縁皮膜を形成するに際
し、処理液中のハロゲン元素とアルカリ金属を抑制する
ことによって、歪取り焼鈍後の耐食性を著しく向上させ
ることが可能である。<Effects of the Invention> As explained above, according to the present invention, halogen elements and alkali metals in the treatment solution can be suppressed when forming a chromium compound-organic resin insulation film on the surface of the electric M1 control plate. This makes it possible to significantly improve the corrosion resistance after strain relief annealing.
Claims (2)
樹脂系絶縁皮膜であって、該絶縁皮膜中のハロゲン元素
が０．０２ｗｔ％以下、およびアルカリ金属が０．０８
ｗｔ％以下であることを特徴とする電磁鋼板絶縁皮膜。(1) A chromium compound-organic resin insulating film treated on the surface of an electrical steel sheet, wherein the halogen element in the insulating film is 0.02 wt% or less and the alkali metal content is 0.08 wt% or less.
An electrical steel sheet insulating film characterized by having a content of wt% or less.
皮膜を形成するに当り、ハロゲン元素が１０ｐｐｍ以下
およびアルカリ金属が４０ｐｐｍ以下である処理液を塗
布、焼き付けして絶縁皮膜を形成することを特徴とする
電磁鋼板絶縁皮膜の形成方法。(2) When forming a chromium compound-organic resin-based insulating film on the surface of an electrical steel sheet, it is recommended that a treatment solution containing 10 ppm or less of halogen elements and 40 ppm or less of alkali metals be applied and baked to form the insulating film. Characteristic method for forming an insulating film on electrical steel sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22831186A JPS6384671A (en) | 1986-09-29 | 1986-09-29 | Insulating film of electrical steel sheet and formation thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22831186A JPS6384671A (en) | 1986-09-29 | 1986-09-29 | Insulating film of electrical steel sheet and formation thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6384671A true JPS6384671A (en) | 1988-04-15 |
Family
ID=16874452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22831186A Pending JPS6384671A (en) | 1986-09-29 | 1986-09-29 | Insulating film of electrical steel sheet and formation thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6384671A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7872064B2 (en) | 2006-09-08 | 2011-01-18 | Nissin Chemical Industry Co., Ltd. | Protective coating containing acetylene compound |
| US7955714B2 (en) | 2006-09-08 | 2011-06-07 | Nissin Chemical Industry Co., Ltd. | Coating composition for a metal, and metal material having a coating of such coating composition |
| US7985486B2 (en) | 2006-09-08 | 2011-07-26 | Nissin Chemical Industry Co., Ltd. | Coating composition for a metal, and metal material having a coating of such coating composition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5681681A (en) * | 1979-12-05 | 1981-07-03 | Nippon Steel Corp | Forming method for insulating film with superior heat resistance |
| JPS59116382A (en) * | 1982-12-24 | 1984-07-05 | Kawasaki Steel Corp | Electrical sheet formed with insulating film having excellent punchability and corrosion resistance after stress relief annealing |
-
1986
- 1986-09-29 JP JP22831186A patent/JPS6384671A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5681681A (en) * | 1979-12-05 | 1981-07-03 | Nippon Steel Corp | Forming method for insulating film with superior heat resistance |
| JPS59116382A (en) * | 1982-12-24 | 1984-07-05 | Kawasaki Steel Corp | Electrical sheet formed with insulating film having excellent punchability and corrosion resistance after stress relief annealing |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7872064B2 (en) | 2006-09-08 | 2011-01-18 | Nissin Chemical Industry Co., Ltd. | Protective coating containing acetylene compound |
| US7955714B2 (en) | 2006-09-08 | 2011-06-07 | Nissin Chemical Industry Co., Ltd. | Coating composition for a metal, and metal material having a coating of such coating composition |
| US7985486B2 (en) | 2006-09-08 | 2011-07-26 | Nissin Chemical Industry Co., Ltd. | Coating composition for a metal, and metal material having a coating of such coating composition |
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