JP6588973B2 - 耐食部材とその製造方法 - Google Patents
耐食部材とその製造方法 Download PDFInfo
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Description
基材として、サイズ50×70mm、板厚3mmの、表面を機械研磨により表面粗さRa 0.05μmに仕上げた鉄鋼SS400(SS400とは、JIS規格に規定される一般構造用圧延鋼材の種類である。)を用いた。第1の層の形成に用いたNi電気めっき液は、表1に示す添加剤を含むワット浴を用いた。第2の層の形成に用いたZn電気めっき液は、表2に示すジンケート浴を用いた。第一、第2の層各層における狙いのめっき膜厚は、いずれも0.9μmと設定した。
得られた皮膜の断面構造を図5に示す。図5に示すように、基材(図示せず)表面に第1の層3と第2の層4とで構成される交互積層膜が形成できていることを確認した。Ni層(第1の層)の組織をより詳細に観察するため、エッチングにより組織を露出し、高倍率でSEM観察を行った。その結果、Ni層は層内において2つの層、すなわち下部層と上部層で形成されていることが確認できた。下部層と上部層の膜厚はそれぞれ約0.7μm、0.2μmであった。下部層の粒径は平均0.1μmであり、上部層の粒径は平均0.2μmであった。また、オージェ分光分析によりNi層内におけるNiの含有率を分析すると、下部層が上部層に比べてNi含有率が高くなっていることが確認できた。
比較例1には、実施例1の基材に用いたSS400を用いた。
比較例2には、基材にAl材(材種A6061(A6061とは、JIS規格に規定される構造用アルミニウム合金材の種類である))を用いた。
比較例3には、SS400を基材とし、表1のNiめっき液を用いて基材表面にNiめっき膜を形成したものを用いた結果である。Niめっきの膜厚は10μmである。
比較例4は、SS400を基材とし、表2のZnめっき液を用いて基材表面にZnめっき膜を形成したものを用いた。Znめっきの膜厚は10μmである。
比較例5はSS400を基材とし、表4のNiZn合金めっき液を用いて基材表面にNiZn合金めっき膜を形成したものを用いた。NiZn合金めっきは、めっき液温度25℃、電流密度3A/dm2の条件下で所定時間めっきを行った。NiZnめっきの膜厚は10μmである。
比較例6はSS400を基材とし、表1のNiめっき液を用いて第1の層としてNiを形成させ、次に、表2のZnめっき液を用いて第2の層としてZnを形成させ、次に、Zn層上にNi層の形成させたものを用いた。
実施例1〜6及び比較例1〜5の耐食性を電気化学的に評価した。図6に耐食性評価装置の構成を示す模式図を示す。腐食試験液として空気飽和した5% NaCl溶液を使用し、対極10にPt線、参照極11にAg|AgCl電極(飽和KCl水溶液)、作用極12にSS400板上に皮膜を形成した基板を用い、各電極を試験液13中に配置して電気化学測定を実施した。溶液の温度は25℃一定とした。作用極は図7に示すように、めっき膜が露出した部分の面積1cm2を評価領域15とし、それ以外の面は耐薬品性の被覆材16で被覆した。電気化学測定装置14を用いて、電極を10min間溶液中に保持し浸漬電位を測定した後、動電位分極測定を行った。電位走査範囲は浸漬電位に対して−100mVから最大1500mVまでとし、走査速度は30mV/minとした。JIS G0577:2014に準拠し、アノード曲線中において電流密度が0.1mA/cm2となる電位を孔食電位として計測し、皮膜の耐食性を評価した。
実施例1〜6及び比較例1〜5の耐摩耗性を評価するため、往復摺動試験機を用いて実施した。相手材を無潤滑の条件下所定荷重で接触させた後、試料側を所定速度で往復摺動させた。所定距離摺動後の試料の重量と初期重量から単位摺動距離あたりの重量変化量、すなわち摩耗速度(μg/m)を算出し、その逆数(m/μg)を耐摩耗性の評価指標とした。摺動条件は摺動速度0.1m/s、荷重9.8N、摺動距離(片道)0.04m、相手材は、軸受け等によく使われる特殊鋼SUJ2球(球径φ10mm)とした。測定環境温度は室温(約22℃)とした。評価結果を表5に示す。
Claims (10)
- 基材と、前記基材の表面に形成された皮膜とを有し、
前記基材は、鉄鋼、炭素鋼、ステンレス、Cu、Alまたはそれらの合金であり、
前記皮膜は、主成分がNiである第1の層と、主成分がNiより電極電位が卑な金属である第2の層とを単位構造として、前記単位構造を繰り返したものであり、
前記第2の層は、主成分がZn、Fe、Alまたはそれらの合金であり、
前記皮膜の最表層は第1の層であることを特徴とする耐食部材。 - 前記第1の層は、Ni含有率の異なる複数の層から構成されることを特徴とする請求項1に記載の耐食部材。
- 前記第1の層におけるNiの含有率は80重量%以上であることを特徴とする請求項1または2に記載の耐食部材。
- 前記第1の層におけるNiの含有率は80重量%以上であって、
前記第2の層におけるZnの含有率が80重量%以上であることを特徴とする請求項1から3のいずれか1項に記載の耐食部材。 - 前記第1の層の厚さ及び前記第2の層の厚さはそれぞれ1μm以下であることを特徴とする請求項1から4のいずれか1項に記載の耐食部材。
- 前記第1の層又は前記第2の層は、酸化物、炭化物、窒化物、有機高分子の少なくともいずれかを含むことを特徴とする請求項1から5のいずれか1項に記載の耐食部材。
- 前記第1の層又は前記第2の層は、WO、TiO2、Al2O3、SiO2、SiC、BN、フッ素系樹脂のいずれかを含むことを特徴とする請求項1から6のいずれか1項に記載の耐食部材。
- 前記第1の層又は前記第2の層は、添加剤としてP又はBを含むことを特徴とする請求項1から7のいずれか1項に記載の耐食部材。
- 前記第1の層と前記第2の層の間に、NiとNiよりも電極電位が卑な金属の合金層が形成されていることを特徴とする請求項1から8のいずれか1項に記載の耐食部材。
- 基材と、前記基材の表面に形成された皮膜とを備え、
前記基材は、鉄鋼、炭素鋼、ステンレス、Cu、Alまたはそれらの合金であり、
前記皮膜は、主成分がNiである第1の層と主成分がNiより電極電位が卑な金属である第2の層とを単位構造として、前記単位構造を繰り返したものであり、
前記第2の層は、主成分がZn、Fe、Alまたはそれらの合金であり、
前記皮膜の最表層は第1の層であり、
前記基材又は前記第2の層の上に前記第1の層を形成させる第1のめっき工程と、
前記第1の層の上に前記第2の層を形成させる第2のめっき工程と、を含み、
前記第1のめっき工程は、25℃以下のめっき液を用いて前記第2のめっき工程よりも高い電流密度条件でめっきすることを特徴とする耐食部材の製造方法。
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| PCT/JP2016/062693 WO2016178372A1 (ja) | 2015-05-07 | 2016-04-22 | 耐食皮膜を有する積層体とその製造方法 |
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| KR100432169B1 (ko) * | 2002-06-08 | 2004-05-17 | 한국기초과학지원연구원 | 백색광의 표면 플라즈몬 공명을 이용한 단백질 칩의이미징방법 |
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| US20180264782A1 (en) | 2018-09-20 |
| CN107531017B (zh) | 2020-05-22 |
| WO2016178372A1 (ja) | 2016-11-10 |
| CN107531017A (zh) | 2018-01-02 |
| EP3293001A4 (en) | 2018-12-12 |
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