JP7186301B2 - メッキ密着性及び耐食性に優れたメッキ鋼材及びその製造方法 - Google Patents
メッキ密着性及び耐食性に優れたメッキ鋼材及びその製造方法 Download PDFInfo
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Description
真空度が10-5torr以下に維持されたチャンバ内に素地鉄を配置し、PVD(Physical Vapor Deposition)法により第1のZnメッキ層、第2のMgメッキ層及び第3のZnメッキ層を順次に形成して各試片を製作した。このとき、各試片のメッキ層の厚さは、下記の表1に記載したように調節した。メッキ層の形成時に素地鉄に別途の熱源を供給せず、それぞれメッキ層の形成時に十分な冷却時間を付与して凝固潜熱により各メッキ層間の拡散が発生しないように調節した。以後、チャンバ内の雰囲気温度を30℃/sの速度で200℃まで昇温して140秒間合金化熱処理した後、10℃/sの速度で常温まで冷却した。
真空度が10-5torr以下で維持されたチャンバ内に素地鉄を配置し、PVD(Physical Vapor Deposition)法によって第1のZnメッキ層、第2のMgメッキ層及び第3のZnメッキ層を順次に形成して各試片を製作した。このとき、第1のZnメッキ層、第2のMgメッキ層及び第3のZnメッキ層は、それぞれ2.2μm、2μm及び1.8μmの厚さを有するように形成した。メッキ層の形成時に素地鉄に別途の熱源を供給せず、それぞれメッキ層の形成時に十分な冷却時間を付与して凝固潜熱により各メッキ層間の拡散が発生しないように調節した。以後、チャンバ内の雰囲気温度を30℃/sの速度で200℃まで昇温して合金化熱処理した後、10℃/sの速度で常温まで冷却した。このとき、各試片に合金化熱処理時間(チャンバ内の雰囲気温度が200℃で維持された時間)を異ならせ、これを下記の表2に表した。
Claims (8)
- 素地鉄及び前記素地鉄の表面に形成されたメッキ層を含み、
前記メッキ層は、Zn単相、Mg単相、MgZn2合金相及びMg2Zn11合金相を含み、
前記Zn単相は、15~19体積%の割合で前記メッキ層内に含まれ、
前記素地鉄と隣接した前記メッキ層の下部t/2領域における前記Zn単相の割合は、前記メッキ層表層部側の前記メッキ層の上部t/2領域における前記Zn単相の割合よりさらに大きい(但し、ここでtはメッキ層の厚さ(μm)を意味する)、メッキ密着性及び耐食性に優れたZn-Mg合金メッキ鋼材。 - 前記Mg単相は、13~20体積%の割合で前記メッキ層に含まれる、請求項1に記載のメッキ密着性及び耐食性に優れたZn-Mg合金メッキ鋼材。
- 前記MgZn2合金相は、前記Mg2Zn11合金相よりさらに大きい割合で前記メッキ層に含まれる、請求項1に記載のメッキ密着性及び耐食性に優れたZn-Mg合金メッキ鋼材。
- 前記Mg2Zn11合金相は、18~22体積%の割合で前記メッキ層に含まれる、請求項3に記載のメッキ密着性及び耐食性に優れたZn-Mg合金メッキ鋼材。
- 前記メッキ層は、2~10μmの厚さ(t)を有する、請求項1に記載のメッキ密着性及び耐食性に優れたZn-Mg合金メッキ鋼材。
- 請求項1に記載のメッキ密着性及び耐食性に優れたZn-Mg合金メッキ鋼材の製造方法であって、
PVD(Physical Vapor Deposition)法により素地鉄上に第1のZnメッキ層、第2のMgメッキ層及び第3のZnメッキ層を順次に形成してメッキ鋼材を提供する段階と、
前記メッキ鋼材を加熱して合金化熱処理して合金化メッキ鋼材を提供する段階と、
前記合金化メッキ鋼材を冷却する段階とを含み、
前記メッキ鋼材を提供する段階において、
前記第2のMgメッキ層は、前記第1のZnメッキ層、第2のMgメッキ層及び第3のZnメッキ層の合計厚さに対して30~35%の厚さを有するように形成され、
前記第1のZnメッキ層は、前記第3のZnメッキ層の厚さに対して1.1~4倍の厚さを有するように形成され、
前記第1のZnメッキ層、前記第2のMgメッキ層及び前記第3のZnメッキ層は、2~10μmの合計厚さ(t)を有するように形成され、
前記合金化メッキ鋼材を提供する段階において、
前記メッキ鋼材は180~220℃の温度範囲で加熱され、前記メッキ鋼材の加熱時間は120~160秒である、メッキ密着性及び耐食性に優れたZn-Mg合金メッキ鋼材の製造方法。 - 前記メッキ鋼材を提供する段階は、
前記第1のZnメッキ層の形成後、常温まで冷却する第1の中間冷却段階と、
前記第2のMgメッキ層の形成後、常温まで冷却する第2の中間冷却段階と、
前記第3のZnメッキ層の形成後、常温まで冷却する第3の中間冷却段階とを含む、請求項6に記載のメッキ密着性及び耐食性に優れたZn-Mg合金メッキ鋼材の製造方法。 - 前記合金化メッキ鋼材を冷却する段階において、
前記合金化メッキ鋼材は5~15℃/sの冷却速度で常温まで冷却される、請求項6に記載のメッキ密着性及び耐食性に優れたZn-Mg合金メッキ鋼材の製造方法。
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