JP6816849B1 - 無方向性電磁鋼板およびその製造方法 - Google Patents
無方向性電磁鋼板およびその製造方法 Download PDFInfo
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Abstract
Description
・赤錆が全く発生しなかった場合:A
・赤錆面積率が10%未満の場合:B
・赤錆面積率が10%以上、20%未満の場合:C
・赤錆面積率が20%以上、40%未満の場合:D
・赤錆面積率が40%以上の場合:E
本実施形態に係る無方向性電磁鋼板は、母材鋼板と、母材鋼板の表面に形成された絶縁皮膜とを備える。一般的に、無方向性電磁鋼板の絶縁皮膜を大別すると、全有機皮膜(皮膜全てが有機物で構成されたもの)、無機皮膜(皮膜全てが無機物で構成されたもの)、および複合皮膜(皮膜が有機物および無機物の組み合わせで構成されたものであり、半有機皮膜とも称される)の3種類がある。本実施形態に係る無方向性電磁鋼板の絶縁皮膜は、複合皮膜である。
本実施形態に係る無方向性電磁鋼板において、母材鋼板の表面に形成された複合皮膜中の、全金属成分に占めるZnのモル比率は、10モル%以上である。上述のように、リン酸塩中に占めるZnモル比率を10モル%以上とすることで、優れた塩水噴霧耐食性が得られる。上記Znモル比率は20モル%以上であるのが好ましく、30モル%以上であるのがより好ましい。なお、複合皮膜の金属成分におけるZnは、原則的にZn含有リン酸塩に由来するものであるが、その他の成分に由来するものであってもよい。
本実施形態に係る無方向性電磁鋼板の母材鋼板は特に限定されない。本実施形態に係る無方向性電磁鋼板の課題である耐食性向上は、絶縁皮膜の上記特徴によって達成されるからである。母材鋼板は、無方向性電磁鋼板の母材鋼板として用いられる通常の鋼板から適宜選択することができる。
本実施形態に係る無方向性電磁鋼板は、塗布液を母材鋼板の表面に塗布する工程と、その後、塗布液を焼き付けることにより母材鋼板上に絶縁皮膜を形成する工程とを備える製造方法により製造することができる。
母材鋼板の表面に塗布する塗布液は、リン酸塩水溶液と有機樹脂水分散液とを含む。また、リン酸塩水溶液における金属成分にはZn成分を含有させる。但し、前述した通り、全金属成分に占めるZnのモル比率は10%以上でなければならない。Zn以外の金属成分としては、原料価格および入手し易さ等を考えると、Al、Mg、およびCa等が挙げられるが、これに限定されない。
上述のように、調製した塗布液を焼き付ける際には、雰囲気露点の制御が重要となる。具体的には、雰囲気露点を+30℃以上とすることで、Zn溶出量が顕著に増加し、それにより、優れた塩水噴霧耐食性が得られるようになる。雰囲気露点は+40℃以上とするとZn溶出量がさらに増加するため、より好ましい。
・赤錆が全く発生しなかった場合:A
・赤錆面積率が10%未満の場合:B
・赤錆面積率が10%以上、20%未満の場合:C
・赤錆面積率が20%以上、40%未満の場合:D
・赤錆面積率が40%以上の場合:E
Claims (7)
- 母材鋼板と、
前記母材鋼板の表面に形成された、Zn含有リン酸塩と有機樹脂との複合皮膜と、
を備える無方向性電磁鋼板であって、
前記複合皮膜中の、全ての金属成分に占めるZnのモル比率が10モル%以上であり、
前記無方向性電磁鋼板を沸騰させた蒸留水中で20分間煮沸した後の、前記蒸留水中のZn溶出量が1.0mg/m2以上である、
無方向性電磁鋼板。
但し、前記Zn溶出量の定量方法は、JIS K 0102:2016「工業排水試験方法」53.3「ICP発光分光分析法」による。 - 前記複合皮膜の前記金属成分が、さらにAl、Mg、およびCaからなる群から選択される一種以上を含む、
請求項1に記載の無方向性電磁鋼板。 - 前記有機樹脂が、アクリル樹脂、スチレン樹脂、アクリル−スチレン樹脂、エポキシ樹脂、ポリエステル樹脂、フェノール樹脂、およびウレタン樹脂からなる群から選択される一種以上を含む、
請求項1または請求項2に記載の無方向性電磁鋼板。 - 請求項1から請求項3までのいずれか一項に記載の無方向性電磁鋼板の製造方法であって、
全ての金属成分に占めるZnのモル比率が10モル%以上であるZn含有リン酸塩と、有機樹脂とを含む塗布液を、母材鋼板の表面に塗布する工程と、
その後、露点+30℃以上の雰囲気下で前記塗布液を焼き付けることにより前記母材鋼板上に前記複合皮膜を形成する工程とを備える、
無方向性電磁鋼板の製造方法。 - 前記塗布液が、さらに、Al、Mg、およびCaからなる群から選択される一種以上を含有する、
請求項4に記載の無方向性電磁鋼板の製造方法。 - 前記有機樹脂が、アクリル樹脂、スチレン樹脂、アクリル−スチレン樹脂、エポキシ樹脂、ポリエステル樹脂、フェノール樹脂、およびウレタン樹脂からなる群から選択される一種以上である、
請求項4または請求項5に記載の無方向性電磁鋼板の製造方法。 - 前記塗布液を焼き付ける際の到達温度が200〜450℃の範囲内である、
請求項4から請求項6までのいずれか一項に記載の無方向性電磁鋼板の製造方法。
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EP3922741B1 (en) | 2024-03-20 |
CN113811626A (zh) | 2021-12-17 |
WO2021210149A1 (ja) | 2021-10-21 |
US20220316022A1 (en) | 2022-10-06 |
KR102332737B1 (ko) | 2021-12-01 |
BR112021016527A2 (pt) | 2021-11-16 |
KR20210129080A (ko) | 2021-10-27 |
EP3922741A4 (en) | 2022-03-30 |
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