JP2692279B2 - A method of forming an insulating film with excellent corrosion resistance on the surface of electrical steel sheets - Google Patents
A method of forming an insulating film with excellent corrosion resistance on the surface of electrical steel sheetsInfo
- Publication number
- JP2692279B2 JP2692279B2 JP1186312A JP18631289A JP2692279B2 JP 2692279 B2 JP2692279 B2 JP 2692279B2 JP 1186312 A JP1186312 A JP 1186312A JP 18631289 A JP18631289 A JP 18631289A JP 2692279 B2 JP2692279 B2 JP 2692279B2
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- Japan
- Prior art keywords
- weight
- parts
- steel sheet
- corrosion resistance
- magnetic 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.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
- H01F1/18—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical Treatment Of Metals (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、耐食性に優れた絶縁皮膜を電磁鋼板の表
面に形成する方法に関するものである。TECHNICAL FIELD The present invention relates to a method for forming an insulating coating having excellent corrosion resistance on the surface of a magnetic steel sheet.
［従来の技術］ 電磁鋼板は、モータやトランス等の電気機器用鉄心材
として使用されている。電気機器用鉄心は、絶縁皮膜が
形成された電磁鋼板を所望の形状に打抜き、次いで、所
望形状の電磁鋼板を積層し、その側面を溶接することに
よって組み立てられる。また、場合によっては、打抜い
た後の電磁鋼板に、加工歪を除去して磁気特性を向上さ
せるために、歪取り焼鈍を施こす。[Prior Art] Magnetic steel sheets are used as core materials for electric devices such as motors and transformers. The iron core for electric equipment is assembled by punching an electromagnetic steel sheet having an insulating film formed into a desired shape, laminating electromagnetic steel sheets having a desired shape, and welding the side surfaces thereof. Further, in some cases, the punched electromagnetic steel sheet is subjected to strain relief annealing in order to remove processing strain and improve magnetic characteristics.
従って、電磁鋼板の表面に形成される皮膜は、優れた
電気絶縁性を有することは勿論、優れた打抜性、溶接
性、耐食性等を有していることが必要である。Therefore, it is necessary that the film formed on the surface of the electromagnetic steel sheet has not only excellent electric insulation but also excellent punchability, weldability, corrosion resistance and the like.
従来から、これ等の特性の向上を図るために、種々の
提案がなされている。特に、打抜性に関しては、重クロ
ム酸塩および有機樹脂を主成分とする処理液によって絶
縁皮膜（以下、単に皮膜という）を形成して、打抜性の
向上を図るという提案がなされている。Heretofore, various proposals have been made in order to improve these characteristics. In particular, regarding punchability, it has been proposed to improve punchability by forming an insulating film (hereinafter simply referred to as a film) with a treatment liquid containing dichromate and an organic resin as main components. .
しかしながら、上記処理液によって皮膜が形成された
電磁鋼板は、優れた打抜性を有するものの、前記皮膜
は、歪取り焼鈍後の耐食性に劣るという問題があった。However, although the electrical steel sheet having a coating formed by the treatment liquid has excellent punchability, the coating has a problem that the corrosion resistance after strain relief annealing is poor.
そこで、この問題を解決するために、特開昭59-11638
2号公報には、上記処理液中に所定量のりん酸塩を添加
することが開示されている。以下、先行技術という。Therefore, in order to solve this problem, JP-A-59-11638
Japanese Patent Publication No. 2 discloses that a predetermined amount of phosphate is added to the treatment liquid. Hereinafter referred to as prior art.
［発明が解決しようとする課題］ ところが、上記先行技術は、次のような問題を有して
いる。即ち、本発明者らの実験結果によれば皮膜の焼付
け温度を高くしないと皮膜の吸湿性が高くなって、歪取
り焼鈍前の耐食性が劣化する。なお、焼付け温度を高く
すると、有機成分が熱分解して皮膜の密着性が低下す
る。[Problems to be Solved by the Invention] However, the above-mentioned prior art has the following problems. That is, according to the experimental results of the present inventors, unless the baking temperature of the coating is raised, the hygroscopicity of the coating increases and the corrosion resistance before the strain relief annealing deteriorates. In addition, when the baking temperature is increased, the organic components are thermally decomposed and the adhesion of the film is lowered.
従って、この発明の目的は、優れた打抜性および密着
性を有していることは勿論、歪取り焼鈍前後の耐食性に
優れた絶縁皮膜を電磁鋼板の表面に形成する方法を提供
することにある。Therefore, an object of the present invention is to provide a method of forming an insulating coating having excellent corrosion resistance before and after strain relief annealing on the surface of a magnetic steel sheet as well as having excellent punchability and adhesion. is there.
［課題を解決するための手段］ 本願発明者等は、優れた打抜性および密着性を有して
いることは勿論、歪取り焼鈍前後の耐食性に優れた絶縁
皮膜を電磁鋼板の表面に形成することができる方法を開
発すべく、鋭意研究を重ねた。その結果、皮膜の耐食性
は、皮膜の繖密性に左右されること、そして、クロム酸
の還元剤として、ポリエチレングリコールと、コハク酸
および／またはアジピン酸とからなるものを使用すれ
ば、クロム酸の還元過程で発生する反応ガス量が少な
く、この結果、皮膜が繖密になって、耐食性が向上する
といった知見を得た。[Means for Solving the Problems] The inventors of the present application have formed an insulating film having excellent corrosion resistance before and after stress relief annealing on the surface of a magnetic steel sheet as well as having excellent punchability and adhesion. We have earnestly conducted research to develop a method that can be done. As a result, the corrosion resistance of the coating depends on the tightness of the coating, and if a reducing agent for chromic acid consisting of polyethylene glycol and succinic acid and / or adipic acid is used, It was found that the amount of reaction gas generated in the reduction process of (1) was small, and as a result, the coating became dense and the corrosion resistance was improved.
この発明は、上述した知見に基づいてなされたもので
あって、無水クロム酸および重クロム酸塩の少なくとも
一種と、２価または３価の金属の酸化物、水酸化物また
は炭酸塩とが主成分として含まれている無機系水溶液
に、前記水溶液中のCrO3換算量100重量部に対して、15
から25重量部のポリエチレングリコール、および、５か
ら15重量部のコハク酸および／またはアジピン酸からな
る還元剤と、固形分として５から100重量部の相溶性の
ある有機樹脂とが添加されているものからなる処理液
を、電磁鋼板の表面に塗布し、次いで、焼付けることに
特徴を有するものである。The present invention was made based on the above-mentioned findings, and is mainly composed of at least one of chromic anhydride and dichromate, and an oxide, hydroxide or carbonate of a divalent or trivalent metal. Inorganic aqueous solution contained as a component, relative to 100 parts by weight of CrO 3 conversion amount in the aqueous solution, 15
To 25 parts by weight of polyethylene glycol, and 5 to 15 parts by weight of a reducing agent consisting of succinic acid and / or adipic acid, and 5 to 100 parts by weight of a compatible organic resin as a solid content are added. It is characterized in that a treatment liquid consisting of a substance is applied to the surface of an electromagnetic steel sheet and then baked.
次に、この発明において、還元剤の成分範囲の限定理
由について説明する。Next, in the present invention, the reason for limiting the component range of the reducing agent will be described.
この発明の処理液中に含まれる還元剤は、ポリエチレ
ングリコールと、コハク酸および／またはアジピン酸と
からなるが、それらの配合割合およびクロム酸の還元作
用は複雑な関係を示し、たとえば、コハク酸および／ま
たはアジピン酸の配合量を、ポリエチレングリコールと
同量かそれ以下にした場合、その配合量に見合うクロム
酸の還元作用は得られず、ポリエチレングリコールの添
加量によってクロム酸の還元力が決まるといった現象が
認められた。The reducing agent contained in the treatment liquid of the present invention comprises polyethylene glycol and succinic acid and / or adipic acid, and their mixing ratio and the reducing action of chromic acid show a complicated relationship. If the amount of adipic acid and / or adipic acid is equal to or less than that of polyethylene glycol, the reducing action of chromic acid corresponding to the amount is not obtained, and the reducing amount of chromic acid is determined by the amount of polyethylene glycol added. Such a phenomenon was recognized.
そこで、皮膜の耐食性の向上と、クロム酸の還元に適
正なポリエチレングリコールとコハク酸との配合割合
を、以下のようにして調べた。Therefore, the proportions of polyethylene glycol and succinic acid that are suitable for improving the corrosion resistance of the coating and reducing chromic acid were examined as follows.
0.3wt.％のSiを含有した電磁鋼板の表面に、ポリエチ
レングリコールとコハク酸との配合割合が異なる種々の
処理液を塗布し、400℃の温度で80秒間焼付け処理を施
こして、電磁鋼板の表面に1.5g/m2の量の皮膜を形成し
た。そして、このようにして皮膜を形成した電磁鋼板を
50℃の温度で95％以上の湿度を有する槽内に10日間放置
し、発錆面積とCr6+の溶出による皮膜の変色の有無につ
いて調べた。この結果を第１図に示す。Various treatment liquids with different mixing ratios of polyethylene glycol and succinic acid were applied to the surface of the electrical steel sheet containing 0.3 wt.% Si, and the electrical steel sheet was baked at 400 ° C for 80 seconds. An amount of 1.5 g / m 2 was formed on the surface of the film. Then, the electromagnetic steel sheet on which the film is formed in this way is
The film was left in a tank having a humidity of 95% or more at a temperature of 50 ° C for 10 days, and the rusted area and the presence or absence of discoloration of the film due to the elution of Cr 6+ were examined. The result is shown in FIG.
なお、上記処理液は、下記成分からなっている。 The treatment liquid is composed of the following components.
（１）無水クロム酸:100重量部、 （２）酸化マグネシウム:30重量部、 （３）ポリエチレングリコール:0から35重量部、 （４）コハク酸:0から25重量部、 （５）アクリル系樹脂エマルジョン（固形分として）:3
0重量部、 （６）水:1000重量部。(1) Chromic anhydride: 100 parts by weight, (2) Magnesium oxide: 30 parts by weight, (3) Polyethylene glycol: 0 to 35 parts by weight, (4) Succinic acid: 0 to 25 parts by weight, (5) Acrylic Resin emulsion (as solid content): 3
0 parts by weight, (6) Water: 1000 parts by weight.
第１図において、各印は、以下の意味を示す。 In FIG. 1, each mark has the following meaning.
◎印：錆が全くない、 ○印：錆の面積が５％未満、 ×印：錆の面積が５％以上、 Δ印：皮膜からCr6+が溶出して変色。⊚: No rust, ○: Rust area is less than 5%, X: Rust area is 5% or more, Δ: Cr 6+ is eluted from the film and discolored.
また、第１図において（）は、処理液を、40℃の温度
に保持された恒温槽内に静置したところ、５日未満で、
変色あるいは沈殿物が生じたことを示す。Further, in FIG. 1, () shows that the treatment liquid was allowed to stand in a constant temperature bath kept at a temperature of 40 ° C., and within 5 days,
Indicates that discoloration or precipitation has occurred.
第１図から明らかなように、還元剤として、15から25
重量部のポリエチレングリコールおよび５から15重量部
のコハク酸からなるものを使用すれば、錆が全く発生せ
ず、皮膜の耐食性が大幅に向上することがわかる。As can be seen from Fig. 1, 15 to 25 as reducing agent
It can be seen that the use of polyethylene glycol in an amount of 5 parts by weight and succinic acid in an amount of 5 to 15 parts by weight does not cause rust at all and significantly improves the corrosion resistance of the film.
ポリエチレングリコールにアジピン酸を配合したも
の、および、ポリエチレングリコールにコハク酸とアジ
ピン酸とを配合したものを還元剤として使用した場合に
も、第１図とほぼ同様な結果が得られた。Similar results to those shown in FIG. 1 were obtained when polyethylene glycol with adipic acid and polyethylene glycol with succinic acid and adipic acid were used as reducing agents.
従って、この発明においては、還元剤として、15から
25重量部のポリエチレングリコール、および、５から15
重量部のコハク酸および／またはアジピン酸からなるも
のを使用する。Therefore, in the present invention, from 15 as the reducing agent
25 parts by weight polyethylene glycol, and 5 to 15
One consisting of parts by weight of succinic acid and / or adipic acid is used.
この発明においては、アクリル系、酢ビ系、スチレン
系、フエノール系等のエマルジョン樹脂および水溶性樹
脂の少なくとも１種を、有機樹脂として使用する。In the present invention, at least one type of acrylic resin, vinyl acetate-based, styrene-based, phenol-based emulsion resin and water-soluble resin is used as the organic resin.
有機樹脂の添加量が５重量部未満では、打抜性が低下
し、一方、100重量部を越えると耐熱性が低下する。従
って、有機樹脂の添加量は、固形分として、５から100
重量部に限定した。If the amount of the organic resin added is less than 5 parts by weight, the punchability is deteriorated, while if it exceeds 100 parts by weight, the heat resistance is deteriorated. Therefore, the amount of organic resin added should be 5 to 100 as solids.
Limited to parts by weight.
次に、この発明を実施例により更に説明する。 Next, the present invention will be further described with reference to examples.
実施例１ 0.3wt.％のSiを含有する電磁鋼板の表面に、下記成分
からなる処理液を塗布し、400℃の温度で80秒間焼付け
処理を施こして、電磁鋼板の表面に1.0g/m2の量の皮膜
を形成した。Example 1 The surface of a magnetic steel sheet containing 0.3 wt.% Of Si was coated with a treatment liquid consisting of the following components, and baked at a temperature of 400 ° C. for 80 seconds to give a surface of the magnetic steel sheet of 1.0 g / An amount of m 2 of film was formed.
（１）重クロム酸マグネシウム:100重量部、 （２）無水クロム酸:17重量部、 （３）酸化カルシウム:15重量部、 （４）ポリエチレングリコール:25重量部、 （５）コハク酸:15重量部、 （６）アクリル系樹脂エマルジョン（固形分として）:3
0重量部、 （７）水:1000重量部。(1) Magnesium dichromate: 100 parts by weight, (2) Chromic anhydride: 17 parts by weight, (3) Calcium oxide: 15 parts by weight, (4) Polyethylene glycol: 25 parts by weight, (5) Succinic acid: 15 Parts by weight, (6) acrylic resin emulsion (as solid content): 3
0 parts by weight, (7) Water: 1000 parts by weight.
実施例２ 0.3wt.％のSiを含有する電磁鋼板の表面に、下記成分
からなる処理液を塗布し、460℃の温度で100秒間焼付け
処理を施こして、電磁鋼板の表面に2.5kg/m2の量の皮膜
を形成した。Example 2 The surface of a magnetic steel sheet containing 0.3 wt.% Of Si was coated with a treatment liquid consisting of the following components and baked at a temperature of 460 ° C. for 100 seconds to give a surface of a magnetic steel sheet of 2.5 kg / An amount of m 2 of film was formed.
（１）無水クロム酸:100重量部、 （２）酸化マグネシウム:30重量部、 （３）ポリエチレングリコール:22重量部、 （４）アジピン酸:11重量部、 （５）水溶性フエノール系樹脂（固形分として）:45重
量部、 （６）水:1000重量部。(1) Chromic anhydride: 100 parts by weight, (2) Magnesium oxide: 30 parts by weight, (3) Polyethylene glycol: 22 parts by weight, (4) Adipic acid: 11 parts by weight, (5) Water-soluble phenolic resin ( As solid content): 45 parts by weight, (6) Water: 1000 parts by weight.
実施例３ 0.3wt.％のSiを含有する電磁鋼板の表面に、下記成分
からなる処理液を塗布し、400℃の温度で80秒間焼付け
処理を施こして、電磁鋼板の表面に1.5g/m2の量の皮膜
を形成した。Example 3 The surface of a magnetic steel sheet containing 0.3 wt.% Of Si was coated with a treatment liquid containing the following components, and baked at a temperature of 400 ° C. for 80 seconds to give a surface of a magnetic steel sheet of 1.5 g / An amount of m 2 of film was formed.
（１）無水クロム酸:100重量部、 （２）酸化マグネシウム:30重量部、 （３）ホウ酸:25重量部、 （４）ポリエチレングリコール:22重量部、 （５）コハク酸:11重量部、 （６）アクリル系樹脂−フエノール系樹脂混合エマルジ
ョン（固形分として）:35重量部、 （７）水:1000重量部。(1) Chromic anhydride: 100 parts by weight, (2) Magnesium oxide: 30 parts by weight, (3) Boric acid: 25 parts by weight, (4) Polyethylene glycol: 22 parts by weight, (5) Succinic acid: 11 parts by weight , (6) Acrylic resin-phenolic resin mixed emulsion (as solid content): 35 parts by weight, (7) Water: 1000 parts by weight.
実施例４ 0.3wt.％のSiを含有する電磁鋼板の表面に、下記成分
からなる処理液を塗布し、460℃の温度で80秒間焼付け
処理を施こして、電磁鋼板の表面に1.5g/m2の量の皮膜
を形成した。Example 4 The surface of a magnetic steel sheet containing 0.3 wt.% Of Si was coated with a treatment liquid consisting of the following components, and baked at a temperature of 460 ° C. for 80 seconds to give a surface of the magnetic steel sheet of 1.5 g / An amount of m 2 of film was formed.
（１）重クロム酸マグネシウム:100重量部、 （２）無水クロム酸:17重量部、 （３）ホウ酸:20重量部、 （４）第１リン酸マグネシウム:25重量部、 （５）ポリエチレングリコール:25重量部、 （６）コハク酸:15重量部、 （７）アクリル系樹脂−フエノール系樹脂混合エマルジ
ョン：（固形分として）42重量部、 （７）水:1000重量部。(1) Magnesium dichromate: 100 parts by weight, (2) Chromic anhydride: 17 parts by weight, (3) Boric acid: 20 parts by weight, (4) Primary magnesium phosphate: 25 parts by weight, (5) Polyethylene Glycol: 25 parts by weight, (6) Succinic acid: 15 parts by weight, (7) Acrylic resin-phenolic resin mixed emulsion: 42 parts by weight (as solid content), (7) Water: 1000 parts by weight.
次に、比較例について説明する。 Next, a comparative example will be described.
比較例１ 0.3wt.％のSiを含有する電磁鋼板の表面に、下記成分
からなる処理液を塗布し、400℃の温度で80秒間焼付け
処理を施こして、電磁鋼板の表面に1.0g/m2の量の皮膜
を形成した。Comparative Example 1 The surface of a magnetic steel sheet containing 0.3 wt.% Of Si was coated with a treatment liquid consisting of the following components and baked at a temperature of 400 ° C. for 80 seconds to give a surface of the magnetic steel sheet of 1.0 g / An amount of m 2 of film was formed.
（１）重クロム酸マグネシウム:100重量部、 （２）無水クロム酸:17重量部、 （３）酸化カルシウム:15重量部、 （４）エチレングリコール:25重量部、 （５）アクリル系樹脂エマルジョン（固形分として）:3
0重量部、 （６）水:1000重量部。(1) Magnesium dichromate: 100 parts by weight, (2) Chromic anhydride: 17 parts by weight, (3) Calcium oxide: 15 parts by weight, (4) Ethylene glycol: 25 parts by weight, (5) Acrylic resin emulsion (As solids): 3
0 parts by weight, (6) Water: 1000 parts by weight.
比較例２ 0.3wt.％のSiを含有する電磁鋼板の表面に、下記成分
からなる処理液を塗布し、460℃の温度で80秒間焼付け
処理を施こして、電磁鋼板の表面に1.5g/m2の量の皮膜
を形成した。Comparative Example 2 The surface of a magnetic steel sheet containing 0.3 wt.% Of Si was coated with a treatment liquid consisting of the following components and baked at a temperature of 460 ° C. for 80 seconds to give a surface of the magnetic steel sheet of 1.5 g / An amount of m 2 of film was formed.
（１）重クロム酸マグネシウム:100重量部、 （２）無水クロム酸:17重量部、 （３）ホウ酸:20重量部、 （４）第１リン酸マグネシウム:35重量部、 （５）エチレングリコール:25重量部、 （６）アクリル系樹脂−フエノール系樹脂混合エマルジ
ョン（固形分として）:42重量部、 （７）水:1000重量部。(1) Magnesium dichromate: 100 parts by weight, (2) Chromic anhydride: 17 parts by weight, (3) Boric acid: 20 parts by weight, (4) Monobasic magnesium phosphate: 35 parts by weight, (5) Ethylene Glycol: 25 parts by weight, (6) Acrylic resin-phenolic resin mixed emulsion (as solid content): 42 parts by weight, (7) Water: 1000 parts by weight.
このようにして皮膜を形成した電磁鋼板の、層間抵
抗、密着性、打抜性、耐食性、歪取り焼鈍後の耐食性、
歪取り焼鈍後の耐フレオン性を、下記試験条件に従って
調べた。この結果を第１表に示す。Interlayer resistance, adhesion, punchability, corrosion resistance, corrosion resistance after strain relief annealing of the electromagnetic steel sheet thus formed with a film,
The Freon resistance after the strain relief annealing was examined according to the following test conditions. Table 1 shows the results.
（１）層間抵抗:JISC 2550第２法。(1) Interlayer resistance: JIS C 2550 second method.
（２）密着性：試験片を180°曲げ、皮膜が剥離しない
最小曲げ径。(2) Adhesion: The minimum bending diameter at which the test piece is bent 180 ° and the film does not peel off.
（３）打抜性：下記条件下で、打抜油を使用して連続打
抜きしたときの、ブランクのかえり高さが50μｍに達す
るまでの打抜き回数。(3) Punchability: The number of punches until the burr height of the blank reaches 50 μm when punching is continuously performed using punching oil under the following conditions.
打抜形状:10mmφ丸型、 金型材質:SKD11。Punched shape: 10mmφ round shape, die material: SKD11.
（４）耐食性：温度50℃、湿度95％以上の湿潤槽内に試
験片を10日間放置したときの発錆面積。(4) Corrosion resistance: A rusting area when a test piece is left for 10 days in a moisturizing bath at a temperature of 50 ° C and a humidity of 95% or more.
（５）歪取り焼鈍：N2雰囲気中で、750℃,2時間焼鈍。(5) Strain relief annealing: Annealing at 750 ° C. for 2 hours in N 2 atmosphere.
（６）歪取り焼鈍後の耐食性：温度50℃、湿度80％の恒
温恒湿試験槽内に試験片を20日間放置したときの発錆面
積。(6) Corrosion resistance after strain relief annealing: Rust area when a test piece is left for 20 days in a constant temperature and humidity test tank at a temperature of 50 ° C and a humidity of 80%.
（７）歪取り焼鈍後の耐フレオン性：下記条件下で、オ
ートクレーブ試験後の皮膜の重量変化と冷凍機油の外観
変化。(7) Freon resistance after strain relief annealing: Under the following conditions, the change in the weight of the film and the change in the appearance of the refrigerating machine oil after the autoclave test.
冷媒／冷凍機油：フロン22/スニソ4GS＝8/1 試験条件：オートクレーブ、150℃×53atm、10日間。Refrigerant / Refrigerating machine oil: Freon 22 / Suniso 4GS = 8/1 Test condition: Autoclave, 150 ° C × 53atm, 10 days.
第表１から明らかなように、この発明の方法によって
形成された皮膜は、密着性、打抜性に優れていることは
勿論、歪取り焼鈍後の耐食性および歪取り焼鈍後の耐フ
レオン性に優れていることがわかる。 As is clear from Table 1, the film formed by the method of the present invention is excellent in adhesiveness and punchability, as well as in corrosion resistance after stress relief annealing and freon resistance after stress relief annealing. It turns out to be excellent.
［発明の効果］ 以上説明したように、この発明によれば、耐食性に優
れた絶縁皮膜を電磁鋼板の表面に形成することができる
といった有用な効果がもたらされる。[Effects of the Invention] As described above, according to the present invention, a useful effect that an insulating film having excellent corrosion resistance can be formed on the surface of an electromagnetic steel sheet is brought about.
第１図は、ポリエチレングリコールとコハク酸との適正
混合割合を示すグラフである。FIG. 1 is a graph showing the proper mixing ratio of polyethylene glycol and succinic acid.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 重田 康弘 東京都千代田区丸の内１丁目１番２号 日本鋼管株式会社内 (72)発明者 小野 隆俊 東京都千代田区丸の内１丁目１番２号 日本鋼管株式会社内 (56)参考文献 特開 昭62−297475（ＪＰ，Ａ) 特開 昭49−56200（ＪＰ，Ａ) 特開 昭54−58638（ＪＰ，Ａ) 特公 昭50−15013（ＪＰ，Ｂ１) 特公 昭45−19366（ＪＰ，Ｂ１) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Shigeta 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Tube Co., Ltd. (72) Takatoshi Ono 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe (56) References JP 62-297475 (JP, A) JP 49-56200 (JP, A) JP 54-58638 (JP, A) JP 50-15013 (JP, A) B1) Japanese Patent Publication No. Sho 19-19366 (JP, B1)
Claims (1)
とも一種と、２価または３価の金属の酸化物、水酸化物
または炭酸塩とが主成分として含まれている無機系水溶
液に、前記水溶液中のCrO3換算量100重量部に対して、1
5から25重量部のポリエチレングリコール、および、５
から15重量部のコハク酸および／またはアジピン酸から
なる還元剤と、固形分として５から100重量部の相溶性
のある有機樹脂とが添加されているものからなる処理液
を、電磁鋼板の表面に塗布し、次いで、焼付けることを
特徴とする、耐食性に優れた絶縁皮膜を電磁鋼板の表面
に形成する方法。1. An inorganic aqueous solution containing, as main components, at least one of chromic anhydride and dichromate and a divalent or trivalent metal oxide, hydroxide or carbonate, 1 for every 100 parts by weight of CrO 3 equivalent in aqueous solution
5 to 25 parts by weight of polyethylene glycol, and 5
To 15 parts by weight of a reducing agent consisting of succinic acid and / or adipic acid and 5 to 100 parts by weight of a compatible organic resin as a solid content, a treatment liquid is added to the surface of the magnetic steel sheet. A method of forming an insulating coating having excellent corrosion resistance on the surface of a magnetic steel sheet, which comprises coating the surface of the electrical steel sheet and then baking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1186312A JP2692279B2 (en) | 1989-07-19 | 1989-07-19 | A method of forming an insulating film with excellent corrosion resistance on the surface of electrical steel sheets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1186312A JP2692279B2 (en) | 1989-07-19 | 1989-07-19 | A method of forming an insulating film with excellent corrosion resistance on the surface of electrical steel sheets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0353078A JPH0353078A (en) | 1991-03-07 |
| JP2692279B2 true JP2692279B2 (en) | 1997-12-17 |
Family
ID=16186131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1186312A Expired - Fee Related JP2692279B2 (en) | 1989-07-19 | 1989-07-19 | A method of forming an insulating film with excellent corrosion resistance on the surface of electrical steel sheets |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2692279B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4112866B2 (en) * | 2002-01-16 | 2008-07-02 | 新日本製鐵株式会社 | Non-oriented electrical steel sheet with excellent coating performance |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5219534B2 (en) * | 1972-09-29 | 1977-05-28 | ||
| US3840983A (en) * | 1973-04-30 | 1974-10-15 | Ford Motor Co | Method of manufacture of a dynamoelectric machine laminated armature structure |
| JPS5458638A (en) * | 1977-10-20 | 1979-05-11 | Kawasaki Steel Co | Forming of insulative coating on electric steel plate with improved weldability |
| JPS62297475A (en) * | 1986-06-17 | 1987-12-24 | Kawasaki Steel Corp | Formation of insulating film on electrical steel sheet |
-
1989
- 1989-07-19 JP JP1186312A patent/JP2692279B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0353078A (en) | 1991-03-07 |
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