JP7040678B2 - 無方向性電磁鋼板 - Google Patents
無方向性電磁鋼板 Download PDFInfo
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Description
前記絶縁被膜は、リン酸金属塩、有機樹脂および水溶性有機化合物を、合計で、前記絶縁被膜の全質量に対して50質量%以上含有し、
前記リン酸金属塩は、金属元素として、アルミニウムを少なくとも含み、
前記有機樹脂は、SP値が18.0(MPa)0.5以上24.0(MPa)0.5未満の範囲内であり、
前記水溶性有機化合物は、SP値が19.0(MPa)0.5以上35.0(MPa)0.5未満の範囲内であり、
前記絶縁被膜に対して、X線回折法による測定を行ったときに、前記リン酸金属塩に帰属するピークから算出されるリン酸アルミニウムの結晶化度が、0.5~5.0%である、
無方向性電磁鋼板。
上記(1)に記載の無方向性電磁鋼板。
上記(2)に記載の無方向性電磁鋼板。
上記(1)から(3)までのいずれかに記載の無方向性電磁鋼板。
図1は、本実施形態に係る無方向性電磁鋼板の構造を説明するための模式図である。無方向性電磁鋼板1は、母材鋼板11と、母材鋼板11の表面に形成された絶縁被膜13と、を備える。なお、図1では、母材鋼板11の厚み方向における両側の表面に絶縁被膜13が設けられているが、絶縁被膜13は、母材鋼板11の片側の表面のみに設けられていてもよい。
無方向性電磁鋼板1に用いられる母材鋼板11の鋼種については、特に限定されるものではない。例えば、質量%で、Si:0.1%以上、Al:0.05%以上を含有し、残部がFeおよび不純物である化学組成を有する無方向性電磁鋼板を用いることが好適である。
絶縁被膜13は、母材鋼板11の少なくとも片側の表面上に形成されている。絶縁被膜は、以下で詳述するようなリン酸金属塩と有機樹脂と水溶性有機化合物とを主成分とし、クロムを含有しない絶縁被膜である。具体的には、リン酸金属塩、有機樹脂および水溶性有機化合物を、合計で、絶縁被膜の全質量に対して50質量%以上含有する。以下、各成分について、詳細に説明する。
絶縁被膜に含有されるリン酸金属塩は、リン酸と金属イオンとを主成分とする溶液(例えば、水溶液等)を乾燥させたときの固形分となるものであり、絶縁被膜において、バインダーとして機能するものである。リン酸の種類としては、特に限定されるものではなく、公知の各種のリン酸を使用することが可能であるが、例えば、オルトリン酸、メタリン酸、ポリリン酸等を使用することが好ましい。また、リン酸金属塩の溶液は、各種のリン酸に対し、金属イオンの酸化物、炭酸塩、および、水酸化物の少なくともいずれかを混合することで調製することができる。
リン酸アルミニウム:(2θ)21.59度近傍
絶縁被膜に含有される有機樹脂は、バインダーとして機能するリン酸金属塩中に分散した状態で存在する。リン酸金属塩中に有機樹脂が存在することで、リン酸金属塩の結晶粒が大きく成長することを抑制して、リン酸金属塩の多結晶化を促進することが可能となり、緻密な絶縁被膜を形成することが可能となる。
絶縁被膜に含有される水溶性有機化合物とは、アルコール、エステル、ケトン、エーテル、カルボン酸、糖等の水溶性の有機化合物であり、リン酸金属塩等の無機組成液と相溶するものである。リン酸金属塩および有機樹脂を含む処理液に対して、水溶性有機化合物を配合することにより、処理液を鋼板表面に塗布し乾燥する際に、水溶性有機化合物は、リン酸金属塩等の無機成分中に含有されるようになる。なお、本実施形態における水溶性とは、水に対して無限溶解したり、部分的に溶解したりする特性を意味する。
絶縁被膜の厚みは、例えば、0.3~5.0μm程度であることが好ましく、0.5μm~2.0μm程度であることがより好ましい。絶縁被膜の膜厚を上記のような範囲とすることで、より優れた均一性を保持することが可能となる。
本実施形態に係る無方向性電磁鋼板の製造方法は、母材鋼板と、絶縁被膜と、を備える無方向性電磁鋼板を製造するための製造方法である。本実施形態に係る製造方法は、表面処理剤を、母材鋼板の表面に塗布する工程と、表面処理剤の塗布された前記母材鋼板を加熱して、絶縁被膜を形成する工程と、を含む。各工程について説明する。
塗布工程では、アルミニウムを少なくとも含むリン酸金属塩100質量部に対して、有機樹脂3~50質量部、および水溶性有機化合物5~50質量部を含み、水を溶媒とする表面処理剤を母材鋼板の表面に塗布する。なお、表面処理剤中におけるリン酸金属塩、有機樹脂および水溶性有機化合物の配合割合が、塗布・乾燥後の絶縁被膜におけるリン酸金属塩、有機樹脂および水溶性有機化合物の配合割合となる。
絶縁被膜の形成工程では、表面処理剤の塗布された母材鋼板を所定の加熱温度まで加熱することで、絶縁被膜を形成する。リン酸アルミニウムの結晶化度は、加熱条件に大きく依存する。そのため、表面処理剤の組成に応じて、加熱条件を適正化する必要がある。
9:錆発生が極少量(面積率0.10%以下)
8:錆の発生した面積率=0.10%超0.25%以下
7:錆の発生した面積率=0.25%超0.50%以下
6:錆の発生した面積率=0.50%超1.0%以下
5:錆の発生した面積率=1.0%超2.5%以下
4:錆の発生した面積率=2.5%超5.0%以下
3:錆の発生した面積率=5.0%超10%以下
2:錆の発生した面積率=10%超25%以下
1:錆の発生した面積率=25%超50%以下
4:錆の発生した面積率=0.10%超0.50%以下
3:錆の発生した面積率=0.50%超2.5%以下
2:錆の発生した面積率=2.5%超10%以下
1:錆の発生した面積率=10%超50%以下
11.母材鋼板
13.絶縁被膜
Claims (4)
- 母材鋼板と、前記母材鋼板の表面に形成された絶縁被膜と、を備え、
前記絶縁被膜は、リン酸金属塩、有機樹脂および水溶性有機化合物を、合計で、前記絶縁被膜の全質量に対して50質量%以上含有し、
前記リン酸金属塩は、金属元素として、アルミニウムを少なくとも含み、
前記有機樹脂は、SP値が18.0(MPa)0.5以上24.0(MPa)0.5未満の範囲内であり、
前記水溶性有機化合物は、SP値が19.0(MPa)0.5以上35.0(MPa)0.5未満の範囲内であり、
前記絶縁被膜に対して、X線回折法による測定を行ったときに、前記リン酸金属塩に帰属するピークから算出されるリン酸アルミニウムの結晶化度が、0.5~5.0%である、
無方向性電磁鋼板。 - 前記リン酸金属塩は、金属元素として、アルミニウム以外の2価の金属元素Mをさらに含む、
請求項1に記載の無方向性電磁鋼板。 - 前記金属元素Mは、Zn、Co、Mg、Mn、Niからなる群より選択される1種以上である、
請求項2に記載の無方向性電磁鋼板。 - 前記有機樹脂の含有量は、前記リン酸金属塩100質量部に対して、3質量部以上50質量部以下である、
請求項1から請求項3までのいずれか1項に記載の無方向性電磁鋼板。
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