JP2013241665A - 黒色めっき鋼板 - Google Patents
黒色めっき鋼板 Download PDFInfo
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- JP2013241665A JP2013241665A JP2012134807A JP2012134807A JP2013241665A JP 2013241665 A JP2013241665 A JP 2013241665A JP 2012134807 A JP2012134807 A JP 2012134807A JP 2012134807 A JP2012134807 A JP 2012134807A JP 2013241665 A JP2013241665 A JP 2013241665A
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- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/095—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyurethanes
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- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
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- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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Abstract
【解決手段】黒色めっき鋼板は、Al:1.0〜22.0質量%、Mg:1.3〜10.0質量%を含み、かつZnの黒色酸化物がめっき層中に分布している溶融Al、Mg含有Znめっき層を有する。溶融Al、Mg含有Znめっき層表面の明度は、L*値で60以下である。
【選択図】図1
Description
[1]Al:1.0〜22.0質量%、Mg:1.3〜10.0質量%を含み、かつZnの黒色酸化物がめっき層中に分布している溶融Al、Mg含有Znめっき層を有し、前記溶融Al、Mg含有Znめっき層表面の明度は、L*値で60以下である、黒色めっき鋼板。
[2]前記Znの黒色酸化物は、前記溶融Al、Mg含有Znめっき層中にラメラ状に分布している、[1]に記載の黒色めっき鋼板。
[3]前記Znの黒色酸化物は、Zn2Mg相に由来するZnの酸化物である、[1]または[2]に記載の黒色めっき鋼板。
[4]前記溶融Al、Mg含有Znめっき層の上に無機系皮膜をさらに有する、[1]〜[3]のいずれか一項に記載の黒色めっき鋼板。
[5]前記無機系皮膜は、バルブメタルの酸化物、バルブメタルの酸素酸塩、バルブメタルの水酸化物、バルブメタルのリン酸塩およびバルブメタルのフッ化物からなる群から選ばれる1種類または2種類以上の化合物を含む、[4]に記載の黒色めっき鋼板。
[6]前記バルブメタルは、Ti、Zr、Hf、V、Nb、Ta、W、SiおよびAlからなる群から選ばれる1種類または2種類以上の金属である、[5]に記載の黒色めっき鋼板。
[7]前記溶融Al、Mg含有Znめっき層の上に有機系樹脂皮膜をさらに有する、[1]〜[3]のいずれか一項に記載の黒色めっき鋼板。
[8]前記有機系樹脂皮膜に含まれる有機樹脂は、エーテル系ポリオールおよびエステル系ポリオールからなるポリオールとポリイソシアネートとを反応させて得られるウレタン樹脂であり、前記ポリオール中の前記エーテル系ポリオールの割合は、5〜30質量%である、[7]に記載の黒色めっき鋼板。
[9]前記有機系樹脂皮膜は、多価フェノールをさらに含む、[8]に記載の黒色めっき鋼板。
[10]前記有機系樹脂皮膜は、潤滑剤を含む、[7]〜[9]のいずれか一項に記載の黒色めっき鋼板。
[11]前記有機系樹脂皮膜は、バルブメタルの酸化物、バルブメタルの酸素酸塩、バルブメタルの水酸化物、バルブメタルのリン酸塩およびバルブメタルのフッ化物からなる群から選ばれる1種類または2種類以上の化合物を含む、[7]〜[10]のいずれか一項に記載の黒色めっき鋼板。
[12]前記バルブメタルは、Ti、Zr、Hf、V、Nb、Ta、W、SiおよびAlからなる群から選ばれる1種類または2種類以上の金属である、[11]に記載の黒色めっき鋼板。
[13]前記有機系樹脂皮膜は、ラミネート層または塗布層である、[7]〜[12]のいずれか一項に記載の黒色めっき鋼板。
[14]前記有機系樹脂皮膜は、クリア塗膜である、[7]〜[13]のいずれか一項に記載の黒色めっき鋼板。
本発明の黒色めっき鋼板は、基材鋼板と、溶融Al、Mg含有Znめっき層(以下「めっき層」ともいう)とを有する。本発明の黒色めっき鋼板は、さらに、めっき層の上に無機系皮膜または有機系樹脂皮膜を有していてもよい。
基材鋼板の種類は、特に限定されない。たとえば、基材鋼板としては、低炭素鋼や中炭素鋼、高炭素鋼、合金鋼などからなる鋼板を使用することができる。良好なプレス成形性が必要とされる場合は、低炭素Ti添加鋼、低炭素Nb添加鋼などからなる深絞り用鋼板が基材鋼板として好ましい。また、P、Si、Mnなどを添加した高強度鋼板を用いてもよい。
本発明の黒色めっき鋼板の原板としては、Al:1.0〜22.0質量%、Mg:1.3〜10.0質量%を含み、かつZn2Mg相がめっき層中に分布している溶融Al、Mg含有Znめっき層を有する溶融Al、Mg含有Znめっき鋼板が使用される。より好ましくは、さらにめっき層の金属組織としてAlの単独相を含有する溶融Al、Mg含有Znめっき層を有する溶融Al、Mg含有Znめっき鋼板が使用される。ここで「Alの単独相」とはZnを固溶したAl”相など共晶組織が形成されていないAl相を意味する。たとえば、Alの単独相は、初晶のAl相である。AlおよびMgは、Zn系めっき鋼板の耐食性を向上させる元素であるが、本発明においては、後述するように黒色化のために必須の元素である。Al含有量またはMg含有量が上記範囲の下限値より小さい場合、十分な耐食性が得られない。一方、上限値より大きい場合は、めっき鋼板製造の際にめっき浴表面に酸化物(ドロス)の発生が過多となり、美麗なめっき鋼板が得られない。
本発明の黒色めっき鋼板は、そのめっき層中に分布しているZnの黒色酸化物を含有する(図1A、図2Aおよび図3参照)。ここで、めっき層中とは、めっき層表面とめっき層内部の両方を含む。
本発明の黒色めっき鋼板のめっき層の表面には、無機系皮膜または有機系樹脂皮膜が形成されていてもよい。無機系皮膜および有機系樹脂皮膜は、黒色めっき鋼板の耐食性や耐カジリ性(黒色外観の保持性)などを向上させる。
無機系皮膜は、バルブメタルの酸化物、バルブメタルの酸素酸塩、バルブメタルの水酸化物、バルブメタルのリン酸塩およびバルブメタルのフッ化物からなる群から選ばれる1種類または2種類以上の化合物(以下「バルブメタル化合物」ともいう)を含むものが好ましい。バルブメタル化合物を含ませることで、環境負荷を小さくしつつ、優れたバリア作用を付与することができる。バルブメタルとは、その酸化物が高い絶縁抵抗を示す金属をいう。バルブメタルとしては、Ti、Zr、Hf、V、Nb、Ta、W、SiおよびAlからなる群から選ばれる1種類または2種類以上の金属が挙げられる。バルブメタル化合物としては公知のものを用いてよい。
有機系樹脂皮膜を構成する有機樹脂は、ウレタン系樹脂、エポキシ系樹脂、オレフィン系樹脂、スチレン系樹脂、ポリエステル系樹脂、アクリル系樹脂、フッ素系樹脂、またはこれらの樹脂の組み合わせ、あるいはこれらの樹脂の共重合体または変性物などである。これらの柔軟性のある有機樹脂を用いることで、黒色めっき鋼板を成形加工する際にクラックの発生を抑制することができ、耐食性を向上させることができる。また、有機系樹脂皮膜にバルブメタル化合物を含ませる場合に、バルブメタル化合物を有機系樹脂皮膜(有機樹脂マトリックス)中に分散させることができる(後述)。
本発明の黒色めっき鋼板の製造方法は、1)溶融Al、Mg含有Znめっき鋼板を準備する第1のステップと、2)溶融Al、Mg含有Znめっき鋼板を密閉容器中で水蒸気に接触させる第2のステップとを有する。さらに、任意のステップとして、第2のステップの前または後に3)溶融Al、Mg含有Znめっき鋼板の表面に無機系皮膜または有機系樹脂皮膜を形成するステップを有していてもよい。
第1のステップでは、前述の溶融Al、Mg含有Znめっき鋼板を準備する。
第2のステップでは、第1のステップで準備しためっき鋼板を密閉容器中で水蒸気に接触させて、めっき層を黒色化する。この工程により、めっき層表面の明度(L*値)を60以下(好ましくは40以下、さらに好ましくは35以下)にまで低下させることができる。めっき層表面の明度(L*値)は、分光型色差計を用いて測定される。
水蒸気処理の温度は、50℃以上かつ350℃以下の範囲内が好ましい。水蒸気処理の温度が50℃未満の場合、黒色化速度が遅く、生産性が低下してしまう。また、密閉容器の中で水を100℃以上に加熱すると、容器内の圧力が1気圧以上となり、雰囲気中の酸素濃度を容易に下げることができるため、水蒸気処理の温度は100℃以上であることがより好ましい。一方、水蒸気処理の温度が350℃超の場合、黒色化速度が非常に速くなり、制御することが困難となる。また、処理装置が大型になってしまうだけでなく、昇温および降温に要する時間を含む合計処理時間も長くなってしまい、実用的でない。したがって、雰囲気中の酸素の除去および黒色化速度の制御の観点から、水蒸気処理の温度は、105℃以上かつ200℃以下の範囲内が特に好ましい。
水蒸気処理中の水蒸気の相対湿度は、30%以上かつ100%以下の範囲内が好ましく、30%以上かつ100%未満の範囲内がより好ましい。水蒸気の相対湿度が30%未満の場合、黒色化速度が遅く、生産性が低下してしまう。また、水蒸気の相対湿度が100%の場合、めっき鋼板の表面に結露水が付着して外観不良が生じやすくなるおそれがある。
また、水蒸気処理を行う前にめっき鋼板を加熱してめっき層中のZn2MgをZn11Mg2とすれば、めっき層が黒色外観になるまでの水蒸気処理の時間を短縮することができる。このときのめっき鋼板の加熱温度は、150〜350℃の範囲内が好ましい。加熱温度が150℃未満の場合、事前加熱によりZn2MgをZn11Mg2とするまでの処理時間が長くなるため、水蒸気処理の時間を短縮するメリットが得られない。一方、加熱温度が350℃超の場合、短時間でZn2MgをZn11Mg2に変化させることができるが、さらに反応が進むとめっき層の状態変化が進行して各相が分離した耐食性に劣るめっき層となってしまうおそれがあるため、事前加熱の制御が困難である。事前加熱の処理時間は、処理温度やめっき層中のAlおよびMgの量などに応じて適宜設定すればよい。通常は、250℃で2時間程度加熱すればよい。
第2のステップの前または後に任意に行われる任意のステップでは、溶融Al、Mg含有Znめっき鋼板の表面に無機系皮膜または有機系樹脂皮膜を形成する。
板厚1.2mmのSPCCを基材として、めっき層の厚みが3〜100μmの溶融Al、Mg含有Znめっき鋼板を作製した。このとき、めっき浴の組成(Zn、AlおよびMgの濃度)を変化させて、めっき層の組成およびめっき層の厚みがそれぞれ異なる20種類のめっき鋼板を作製した。作製した20種類のめっき鋼板のめっき浴の組成とめっき層の厚みを表1に示す。なお、めっき浴の組成とめっき層の組成は同一である。
光学条件:d/8°法(ダブルビーム光学系)
視野:2度視野
測定方法:反射光測定
標準光:C
表色系:CIELAB
測定波長:380〜780nm
測定波長間隔:5nm
分光器:回折格子 1200/mm
照明:ハロゲンランプ(電圧12V、電力50W、定格寿命2000時間)
測定面積:7.25mmφ
検出素子:光電子増倍管(R928;浜松ホトニクス株式会社)
反射率:0−150%
測定温度:23℃
標準板:白色
板厚1.2mmのSPCCを基材として、めっき層の厚みが10μmの溶融Al、Mg含有Znめっき鋼板を作製した。このとき、めっき浴の組成(Zn、Al、Mg、Si、TiおよびBの濃度)を変化させて、めっき層の組成がそれぞれ異なる35種類のめっき鋼板を作製した。作製した35種類のめっき鋼板のめっき浴の組成とめっき層の厚みを表3に示す。なお、めっき浴の組成とめっき層の組成は同一である。
表3のNo.36またはNo.52のめっき鋼板に、表5に示す無機系化成処理液を塗布し、水洗することなく電気オーブンに入れて、到達板温が120℃となる条件で加熱乾燥して、めっき鋼板の表面に無機系皮膜を形成した。
表4の実施例39の黒色めっき鋼板(L*値:32)および実施例55の黒色めっき鋼板(L*値:30)に、表8に示す有機系化成処理液を塗布し、水洗することなく電気オーブンに入れて、到達板温が160℃となる条件で加熱乾燥して、黒色めっき鋼板の表面に有機系樹脂皮膜を形成した。ウレタン樹脂は、APX−601(DIC株式会社)を使用した。エポキシ樹脂は、EM−0718(株式会社ADEKA)を使用した。アクリル樹脂は、SFC−55(DIC株式会社)を使用した。
表3のNo.36またはNo.52のめっき鋼板に、表10に示す有機系化成処理液を塗布し、水洗することなく電気オーブンに入れて、到達板温が160℃となる条件で加熱乾燥して、めっき鋼板の表面に有機系樹脂皮膜(ウレタン系樹脂皮膜)を形成した。エーテル系ポリオールは、ポリプロピレングリコールを使用した。エステル系ポリオールは、アジピン酸を使用した。ポリイソシアネートは、水添トリレンジイソシアネートを使用した。
表4の実施例39の黒色めっき鋼板(L*値:32)および実施例55の黒色めっき鋼板(L*値:30)に、表5に示す無機系化成処理液を塗布し、水洗することなく電気オーブンに入れて、到達板温が140℃となる条件で加熱乾燥して、黒色めっき鋼板の表面に無機系樹脂皮膜を形成した。
Claims (14)
- Al:1.0〜22.0質量%、Mg:1.3〜10.0質量%を含み、かつZnの黒色酸化物がめっき層中に分布している溶融Al、Mg含有Znめっき層を有し、
前記溶融Al、Mg含有Znめっき層表面の明度は、L*値で60以下である、
黒色めっき鋼板。 - 前記Znの黒色酸化物は、前記溶融Al、Mg含有Znめっき層中にラメラ状に分布している、請求項1に記載の黒色めっき鋼板。
- 前記Znの黒色酸化物は、Zn2Mg相に由来するZnの酸化物である、請求項1または請求項2に記載の黒色めっき鋼板。
- 前記溶融Al、Mg含有Znめっき層の上に無機系皮膜をさらに有する、請求項1〜3のいずれか一項に記載の黒色めっき鋼板。
- 前記無機系皮膜は、バルブメタルの酸化物、バルブメタルの酸素酸塩、バルブメタルの水酸化物、バルブメタルのリン酸塩およびバルブメタルのフッ化物からなる群から選ばれる1種類または2種類以上の化合物を含む、請求項4に記載の黒色めっき鋼板。
- 前記バルブメタルは、Ti、Zr、Hf、V、Nb、Ta、W、SiおよびAlからなる群から選ばれる1種類または2種類以上の金属である、請求項5に記載の黒色めっき鋼板。
- 前記溶融Al、Mg含有Znめっき層の上に有機系樹脂皮膜をさらに有する、請求項1〜3のいずれか一項に記載の黒色めっき鋼板。
- 前記有機系樹脂皮膜に含まれる有機樹脂は、エーテル系ポリオールおよびエステル系ポリオールからなるポリオールとポリイソシアネートとを反応させて得られるウレタン樹脂であり、
前記ポリオール中の前記エーテル系ポリオールの割合は、5〜30質量%である、
請求項7に記載の黒色めっき鋼板。 - 前記有機系樹脂皮膜は、多価フェノールをさらに含む、請求項8に記載の黒色めっき鋼板。
- 前記有機系樹脂皮膜は、潤滑剤を含む、請求項7〜9のいずれか一項に記載の黒色めっき鋼板。
- 前記有機系樹脂皮膜は、バルブメタルの酸化物、バルブメタルの酸素酸塩、バルブメタルの水酸化物、バルブメタルのリン酸塩およびバルブメタルのフッ化物からなる群から選ばれる1種類または2種類以上の化合物を含む、請求項7〜10のいずれか一項に記載の黒色めっき鋼板。
- 前記バルブメタルは、Ti、Zr、Hf、V、Nb、Ta、W、SiおよびAlからなる群から選ばれる1種類または2種類以上の金属である、請求項11に記載の黒色めっき鋼板。
- 前記有機系樹脂皮膜は、ラミネート層または塗布層である、請求項7〜12のいずれか一項に記載の黒色めっき鋼板。
- 前記有機系樹脂皮膜は、クリア塗膜である、請求項7〜13のいずれか一項に記載の黒色めっき鋼板。
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EP (1) | EP2857544A4 (ja) |
JP (2) | JP5097305B1 (ja) |
KR (1) | KR101537345B1 (ja) |
CN (1) | CN104245997B (ja) |
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BR (1) | BR112014026678B1 (ja) |
CA (1) | CA2871226C (ja) |
IN (1) | IN2014MN02123A (ja) |
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JP2016514202A (ja) * | 2013-02-06 | 2016-05-19 | アルセロールミタル | 特定の微細構造を有するZnAlMgコーティングの金属シート、および対応する生産方法 |
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EP2857544A4 (en) | 2016-01-13 |
AU2012378606A1 (en) | 2014-11-13 |
BR112014026678A2 (pt) | 2017-06-27 |
BR112014026678B1 (pt) | 2020-11-24 |
US9863027B2 (en) | 2018-01-09 |
US20150072166A1 (en) | 2015-03-12 |
RU2605050C2 (ru) | 2016-12-20 |
NZ701240A (en) | 2016-03-31 |
PH12014502343B1 (en) | 2014-12-22 |
JP2013241666A (ja) | 2013-12-05 |
PH12014502343A1 (en) | 2014-12-22 |
TW201343963A (zh) | 2013-11-01 |
KR20140128464A (ko) | 2014-11-05 |
RU2014142992A (ru) | 2016-06-20 |
MY170885A (en) | 2019-09-11 |
IN2014MN02123A (ja) | 2015-09-11 |
CA2871226C (en) | 2017-05-30 |
WO2013160973A1 (ja) | 2013-10-31 |
TWI558846B (zh) | 2016-11-21 |
KR101537345B1 (ko) | 2015-07-16 |
CA2871226A1 (en) | 2013-10-31 |
JP5097305B1 (ja) | 2012-12-12 |
MX2014012951A (es) | 2015-04-08 |
CN104245997A (zh) | 2014-12-24 |
AU2012378606B2 (en) | 2016-07-07 |
EP2857544A1 (en) | 2015-04-08 |
CN104245997B (zh) | 2016-06-22 |
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