JP4502687B2 - 耐テープ剥離性に優れた表面処理亜鉛系メッキ鋼板とその製法、および表面処理剤 - Google Patents
耐テープ剥離性に優れた表面処理亜鉛系メッキ鋼板とその製法、および表面処理剤 Download PDFInfo
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- JP4502687B2 JP4502687B2 JP2004112035A JP2004112035A JP4502687B2 JP 4502687 B2 JP4502687 B2 JP 4502687B2 JP 2004112035 A JP2004112035 A JP 2004112035A JP 2004112035 A JP2004112035 A JP 2004112035A JP 4502687 B2 JP4502687 B2 JP 4502687B2
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- Prior art keywords
- steel sheet
- layer
- treatment agent
- zinc
- plated steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Images
Landscapes
- Chemical Treatment Of Metals (AREA)
Description
0.5≦Si/P≦20……(1)
0.7≦P/Al≦6 ……(2)
を満たす態様は、一段と優れた耐テープ剥離性を発揮すると共に、特に、アルカリ脱脂後の耐テープ剥離性が優れたものとなる。
Si:0.002〜4.5%
P :0.0005〜1.5%
Al:0.0001〜0.5%
1.5≦Si/P≦60、4.5≦Si/Al≦230
を満たすところに特徴がある。
0.5≦Si/P≦20……(1)
0.7≦P/Al≦6 ……(2)
を満たす場合は、一層優れた耐テープ剥離性とアルカリ脱脂後の耐テープ剥離性を確保することができる。
Si:0.002〜4.5%
P :0.0005〜1.5%
Al:0.0001〜0.5%
1.5≦Si/P≦60、4.5≦Si/Al≦230
を満たすように調整することが望ましい。
厚さ0.8mmの鋼板の表面に、電気メッキ法により付着量20g/m2の亜鉛メッキを施した亜鉛メッキ鋼板(品番;SECC)をアルカリ脱脂してから水洗、乾燥したものを原板として使用した。表面処理剤には、重リン酸アルミニウム水溶液(日本化学工業社製、固形分50%)とコロイダルシリカ(「スノーテックス−O」;日産化学工業社製)と水とを混合したものを使用した。なお、重リン酸アルミニウム水溶液とコロイダルシリカおよび水の量を変えたり、必要に応じてリン酸あるいは金属アルミニウムを添加することによって、表1および2に示したように処理剤中のSi、P、Alの濃度を変化させ、表面改質層中のSi、P、Alの含量を変えた。
(1)表面処理液中のSi、PおよびAlの濃度はICP発光分析装置(セイコーアドバンス社製)により、表面改質層中のSi、PおよびAlの量(mg/m2)は、蛍光X線装置(商品名「MIF−2100」;島津製作所製)により、それぞれ測定した。表面改質層の総付着量(mg/m2)は、蛍光X線分析によるSi、PおよびAlの定量結果を元にして、これらがSiO2、AlPO4、、Zn3(PO4)2、Al2O3となって改質層中に生成していると仮定して計算した値である。
供試材の表面に、フィラメントテープ(#9510;スリオンテック製)を貼り付け、40℃×98%RHの雰囲気で、24時間および48時間保管した後、フィラメントテープを剥離し、上塗り皮膜の残存している面積割合を観察し、下記基準
◎:残存率100%
○〜◎:残存率95%以上100%未満
○:残存率90%以上95%未満
△:残存率:70%以上90%未満
×:残存率70%未満
で評価した。
アルカリ脱脂剤(「CL−N364S」:日本パーカーライジング社製)を20g/l、60℃に調整した脱脂液に、供試材を2分間浸漬し、引き上げ、水洗、乾燥した後、この供試材表面にセロハンテープ(ニチバン社製)を貼り付け、24時間後および48時間後に剥離し、上塗り皮膜の残存している面積割合を観察し、上記常態の耐テープ剥離性と同じ基準で評価した。
浸漬法ではなくスプレー法を採用して表面改質層を作成した。すなわち、実験例1における脱脂後の亜鉛メッキ鋼板に、表3に示した組成の表面処理剤(調製方法は実験例1と同じ)をスプレー圧50kPaで2秒吹き付けた後、余分な溶液をリンガロールで除去し、さらに、スプレー圧50kPaで5秒間水洗し、40℃で乾燥することにより、亜鉛メッキ層上に表面改質層を形成した。それ以外については実験例1と同様にして、上塗り皮膜の形成された表面処理亜鉛メッキ鋼板を得た。得られた各供試材を実験例1と同様にして評価し、結果を表3に示した。
表面処理剤として、前記重リン酸アルミニウム水溶液、コロイダルシリカ(前記「スノーテックス−O」)、3種類のポリアクリル酸、水との混合溶液を使用し、表4(表5も同じ)に示した組成の表面処理剤を調整した。まず、スプレー法(条件は実験例2と同じ)を採用し、上塗り皮膜形成前の表面処理亜鉛メッキ鋼板を得た。これらに、実験例1と同様にして上塗り皮膜を形成したものが、No.49〜60である。
測定方法:高感度反射法(入射角75°、平行偏光で赤外光を照射した)
比較材:金蒸着ミラー
分解能:4cm-1
積算回数:500回
装置:日本電子(株)製JIR−5500型フーリエ変換赤外分光光度計
IR−RSC110反射測定ユニット(角度可変型)
IR−SEM100試料切換ステージ
ポリアクリル酸を添加した鋼板の1496cm-1〜1776cm-1のピーク面積から、ポリアクリル酸を添加していない鋼板の1496cm-1〜1776cm-1のピーク面積を差し引いたものを、表面改質層中のポリアクリル酸に由来する吸収強度とした。
Claims (10)
- 亜鉛系メッキ鋼板における亜鉛系メッキ層の上に、少なくとも、表面改質層と上塗り皮膜が形成されている表面処理亜鉛系メッキ鋼板であって、前記表面改質層が、Si換算で1〜30mg/m2のSiO2と、0.5〜15mg/m2のPおよび0.4〜10mg/m2のAlを含むと共に、このSi、P、Alの含有量(質量比)が、下記式(1)、(2)の関係を満たし、前記表面改質層の付着量が4.2〜130mg/m2の範囲であることを特徴とする耐テープ剥離性に優れた表面処理亜鉛系メッキ鋼板。
0.5≦Si/P≦20……(1)
0.7≦P/Al≦6 ……(2) - 上記表面改質層が、さらに有機樹脂を含むものである請求項1に記載の表面処理亜鉛系メッキ鋼板。
- 上記有機樹脂は、表面改質層をFT−IRで観察したときに有機樹脂の構造に由来する吸収強度が0.1〜15となるように含まれているものである請求項2に記載の表面処理亜鉛系メッキ鋼板。
- 上記有機樹脂は、重量平均分子量が100000以上のポリ(メタ)アクリル酸である請求項2または3に記載の表面処理亜鉛系メッキ鋼板。
- 上記上塗り皮膜が、エチレン−不飽和カルボン酸共重合体を主成分とするエマルジョン組成物から得られる樹脂皮膜であって、このエマルジョン組成物は、エチレン−不飽和カルボン酸共重合体以外に、エチレン−不飽和カルボン酸共重合体が有するカルボキシル基1モルに対して0.2〜0.8モルに相当する沸点100℃以下のアミンと、エチレン−不飽和カルボン酸共重合体が有するカルボキシル基1モルに対して0.02〜0.4モルに相当する1価の金属の化合物とを含むと共に、カルボキシル基と反応し得る官能基を2個以上有する架橋剤をエマルジョン組成物の固形分100質量%に対し1〜20質量%含むものである請求項1〜4のいずれかに記載の表面処理亜鉛系メッキ鋼板。
- 請求項1〜5のいずれかに記載の表面処理亜鉛系メッキ鋼板を製造する方法であって、亜鉛系メッキ鋼板の表面に、固形分濃度が0.01〜14.5%(質量%を意味する、以下同じ)であり、Si、P、Alの量と組成比(質量比)が下記の要件を満たす表面処理剤により表面処理剤層を形成した後、水洗して、この表面処理剤層から余剰のPおよび/またはAlを除去し、その後乾燥することにより表面改質層を形成することを特徴とする表面処理亜鉛系メッキ鋼板の製造方法。
Si:0.002〜4.5%
P :0.0005〜1.5%
Al:0.0001〜0.5%
1.5≦Si/P≦60、4.5≦Si/Al≦230 - 上記表面処理剤層をスプレーコーティング法によって形成する請求項6に記載の製造方法。
- 上記表面処理剤が、さらに有機樹脂を含むものである請求項6または7に記載の製造方法。
- 上記有機樹脂は、重量平均分子量が100000以上のポリ(メタ)アクリル酸である請求項8に記載の製造方法。
- 上記表面処理剤中、上記有機樹脂が、固形分で0.01〜3g/l含まれている請求項8または9に記載の製造方法。
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