JP2012514297A - 高分子燃料電池分離板用ステンレス鋼およびその製造方法 - Google Patents
高分子燃料電池分離板用ステンレス鋼およびその製造方法 Download PDFInfo
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- JP2012514297A JP2012514297A JP2011543441A JP2011543441A JP2012514297A JP 2012514297 A JP2012514297 A JP 2012514297A JP 2011543441 A JP2011543441 A JP 2011543441A JP 2011543441 A JP2011543441 A JP 2011543441A JP 2012514297 A JP2012514297 A JP 2012514297A
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- stainless steel
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- 239000013585 weight reducing agent Substances 0.000 description 1
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Abstract
Description
Claims (17)
- 重量%で、C:0.02以下、N:0.02以下、Si:0.4以下、Mn:0.2以下、P:0.04以下、S:0.02以下、Cr:25.0〜32.0、Cu:0〜2.0、Ni:0.8以下、Ti:0.5以下、Nb:0.5以下、残部Feおよび不可避的元素からなり、Moを添加しないステンレス鋼の表面に第2不動態皮膜が形成されたステンレス鋼の製造方法であって、
前記ステンレス鋼を光輝焼鈍あるいは焼鈍・酸洗して、表面に第1不動態皮膜を形成するステップと、
前記ステンレス鋼を、50〜75℃の温度で、表面粗さRaに応じて調整される時間の間、10〜20重量%硫酸水溶液で酸洗浄して、第1不動態皮膜を除去するステップと、
前記ステンレス鋼を水洗するステップと、
前記ステンレス鋼を、40〜60℃の温度で、表面粗さRaに応じて調整される時間の間、10〜20重量%硝酸と1〜10重量%フッ酸の混酸で、不動態化処理して、前記第2不動態皮膜を形成するステップ
とを含むことを特徴とする、高分子燃料電池分離板用ステンレス鋼の製造方法。 - 前記ステンレス鋼は、重量%で、Mo:5.0%以下をさらに含むフェライト系ステンレス鋼であることを特徴とする、請求項1に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
- 前記ステンレス鋼は、重量%で、V:0.1〜1.5、W:0.1〜2.0、La:0.0005〜1.0、Zr:0.0005〜1.0、B:0.0005〜0.1からなる群より選択される1種または2種以上の元素がさらに含まれることを特徴とする、請求項1または2に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
- 前記第1不動態皮膜を除去するステップにおいて、下記式による処理時間の間酸洗浄することを特徴とする、請求項1に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
99−3.18(1/Ra)≦処理時間(t、秒)≦153−3.18(1/Ra) - 前記第2不動態皮膜を形成するステップにおいて、下記式による処理時間の間不動態化処理することを特徴とする、請求項1に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
120+6.73(1/Ra)≦処理時間(t、秒)≦140+6.73(1/Ra) - 前記第2不動態皮膜を形成するステップにおいて、前記第2不動態皮膜の厚さを2〜4.5nmに形成することを特徴とする、請求項1に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
- 前記第2不動態皮膜を形成するステップにおいて、前記第2不動態皮膜のCr/Fe酸化物の比が、1.5nm以内の領域内で1.5以上となるようにすることを特徴とする、請求項1に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
- 前記第2不動態皮膜を形成するステップにおいて、前記第2不動態皮膜のCr(OH)3/Cr酸化物の分布度が、1nmの領域内で0〜0.7の比が確保されるようにすることを特徴とする、請求項1に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
- 前記第1不動態皮膜の除去ステップ、水洗ステップ、および第2不動態皮膜の形成ステップは、ステンレス鋼の光輝焼鈍あるいは焼鈍・酸洗後、鋼板に実施することを特徴とする、請求項1に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
- 前記第1不動態皮膜の除去ステップ、水洗ステップ、および第2不動態皮膜の形成ステップは、ステンレス鋼の光輝焼鈍あるいは焼鈍・酸洗後、分離板の流路成形直前に実施することを特徴とする、請求項1に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
- 前記第1不動態皮膜の除去ステップ、水洗ステップ、および第2不動態皮膜の形成ステップは、ステンレス鋼の光輝焼鈍あるいは焼鈍・酸洗後、分離板の流路成形直後に実施することを特徴とする、請求項1に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
- 前記ステンレス鋼の接触抵抗が、60〜150℃の作動環境下で10mΩcm2以下であることを特徴とする、請求項1〜11のいずれか1項に記載の高分子燃料電池分離板用ステンレス鋼の製造方法。
- 重量%で、C:0.02以下、N:0.02以下、Si:0.4以下、Mn:0.2以下、P:0.04以下、S:0.02以下、Cr:25.0〜32.0、Cu:0〜2.0、Ni:0.8以下、Ti:0.5以下、Nb:0.5以下、残部Feおよび不可避的元素からなることを特徴とする、高分子燃料電池用ステンレス鋼。
- 前記ステンレス鋼は、重量%で、Mo:5.0以下をさらに含むフェライト系ステンレス鋼であることを特徴とする、請求項13に記載の高分子燃料電池分離板用ステンレス鋼。
- 前記ステンレス鋼表面の不動態皮膜の厚さが2〜4.5nmに形成され、Cr/Fe酸化物の比が1.5nm以内の領域内で1.5以上であり、Cr(OH)3/Cr酸化物の分布度が1nmの領域内で0〜0.7の比が確保されることを特徴とする、請求項13または14に記載の高分子燃料電池分離板用ステンレス鋼。
- 前記ステンレス鋼は、重量%で、V:0.1〜1.5、W:0.1〜2.0、La:0.0005〜1.0、Zr:0.0005〜1.0、B:0.0005〜0.1からなる群より選択される1種または2種以上の元素がさらに含まれることを特徴とする、請求項13または14に記載の高分子燃料電池分離板用ステンレス鋼。
- 前記ステンレス鋼の接触抵抗が、60〜150℃の作動環境下で10mΩcm2以下であることを特徴とする、請求項13〜16のいずれか1項に記載の高分子燃料電池分離板用ステンレス鋼。
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US11047029B2 (en) | 2021-06-29 |
CA2748568A1 (en) | 2010-07-08 |
KR20100080379A (ko) | 2010-07-08 |
WO2010077065A2 (ko) | 2010-07-08 |
CN102272343A (zh) | 2011-12-07 |
KR100993412B1 (ko) | 2010-11-09 |
US9290845B2 (en) | 2016-03-22 |
WO2010077065A3 (ko) | 2010-10-07 |
US20160160329A1 (en) | 2016-06-09 |
CN102272343B (zh) | 2014-03-19 |
US20110294042A1 (en) | 2011-12-01 |
CA2748568C (en) | 2017-11-28 |
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