JP6804777B2 - 耐食性評価用金属試験片の作製方法 - Google Patents
耐食性評価用金属試験片の作製方法 Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
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- 239000010439 graphite Substances 0.000 claims description 6
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- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- DXHPZXWIPWDXHJ-UHFFFAOYSA-N carbon monosulfide Chemical class [S+]#[C-] DXHPZXWIPWDXHJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005551 mechanical alloying Methods 0.000 claims description 3
- 150000001247 metal acetylides Chemical class 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims description 2
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 8
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- 229910018191 Al—Fe—Si Inorganic materials 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
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- 229910001566 austenite Inorganic materials 0.000 description 2
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- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
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- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
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- Powder Metallurgy (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Description
本発明の実施の形態の耐食性評価用金属試験片の作製方法では、原料として、母材を構成する金属の粉末と、母材とは組成が異なる金属、金属間化合物、元素の単体(あるいは化合物)の粉末のうち、いずれか1種または2種以上とを、使用する必要がある。従来の腐食試験片の作製方法である真空溶解において、不純物や化合物相の組成制御を難しくさせている根本的な原因は、原料を完全に均一に溶解してから凝固させる方法で金属試験片を作製していることにある。これを解決するためには、出発原料を、金属母相を構成する粉末と、耐食性が母材とは異なる金属の偏析部となる粉末、もしくは不純物や化合物などの第二相となる粉末とに分けておき、完全に均一に溶解せずに、混合・焼結する必要がある。
Claims (8)
- 金属材料の耐局部腐食性の電気化学特性評価、および、腐食起点の電気化学特性評価に適する腐食試験片を作製する耐食性評価用金属試験片の作製方法であって、
母材を構成する金属の粉末に、前記母材とは組成が異なる金属、金属間化合物、元素の単体、または化合物の粉末のうち、いずれか1種または2種以上を均一に混合した後、圧縮成形を経て放電プラズマ焼結法により、焼結時の最高加熱温度をTmax(℃)、前記母材を構成する金属の融点をTmp(℃)としたとき、Tmax<Tmp×0.85であり、かつ、Tmax>Tmp×0.4となる時間が30分未満である条件で焼結を行うことを
特徴とする耐食性評価用金属試験片の作製方法。 - 前記母材を構成する金属の粉末、前記母材とは組成が異なる金属、または前記金属間化合物の粉末のうち、いずれか1種または2種以上が、鋼、鉄またはアルミニウムであることを特徴とする請求項1に記載の耐食性評価用金属試験片の作製方法。
- 前記母材を構成する金属の粉末、前記母材とは組成が異なる金属、または前記金属間化合物の粉末のうち、いずれか1種または2種以上が、粒径150μm以下の鋼、鉄またはアルミニウムのガスアトマイズ粉末であることを特徴とする請求項1または2記載の耐食性評価用金属試験片の作製方法。
- 前記元素の単体または前記化合物の粉末が、硫黄、黒リン、黒鉛、硫化物、酸化物、酸硫化物、炭化物、炭硫化物、窒化物、炭窒化物、ケイ化物、リン化物、ホウ化物、金属間化合物のいずれか1種または2種以上であることを特徴とする請求項1乃至3のいずれか1項に記載の耐食性評価用金属試験片の作製方法。
- 前記元素の単体または前記化合物の粉末が、2種以上の硫化物をメカニカルアロイング法により合成した複合硫化物の粉末であることを特徴とする請求項1乃至4のいずれか1項に記載の耐食性評価用金属試験片の作製方法。
- 前記元素の単体または前記化合物の粉末が、粒径50μm以下の硫化物または複合硫化物であることを特徴とする請求項1乃至5のいずれか1項に記載の耐食性評価用金属試験片の作製方法。
- 前記母材を構成する金属の粉末に対して、S含有量が質量%にて0.001%以上1.0%以下になるように、硫黄粉末またはSを含有する化合物の粉末を混合することを特徴とする請求項1乃至6のいずれか1項に記載の耐食性評価用金属試験片の作製方法。
- 前記放電プラズマ焼結法における通電条件が900A以下であることを特徴とする請求項1乃至7のいずれか1項に記載の耐食性評価用金属試験片の作製方法。
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JP3196707B2 (ja) * | 1997-10-15 | 2001-08-06 | 栗田工業株式会社 | 腐食モニタリング用試験片、方法及び装置 |
JP2004137600A (ja) * | 2002-09-27 | 2004-05-13 | Nano Gijutsu Kenkyusho:Kk | 超硬質・強靱で優れた耐食性を有するナノ結晶オーステナイト鋼バルク材及びその製造方法 |
JP5935258B2 (ja) * | 2011-08-02 | 2016-06-15 | 国立研究開発法人理化学研究所 | 熱膨張制御金属複合材料およびその製造方法 |
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JP6566169B2 (ja) * | 2017-08-09 | 2019-08-28 | 日立金属株式会社 | 合金部材、該合金部材の製造方法、および該合金部材を用いた製造物 |
JP2020100856A (ja) * | 2018-12-20 | 2020-07-02 | 国立大学法人東北大学 | 耐食性に優れる窒化物含有焼結鋼の製造方法 |
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