JP2005126811A - 耐食性,塗装性,接着性に優れた亜鉛系めっき鋼板 - Google Patents
耐食性,塗装性,接着性に優れた亜鉛系めっき鋼板 Download PDFInfo
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- JP2005126811A JP2005126811A JP2004064348A JP2004064348A JP2005126811A JP 2005126811 A JP2005126811 A JP 2005126811A JP 2004064348 A JP2004064348 A JP 2004064348A JP 2004064348 A JP2004064348 A JP 2004064348A JP 2005126811 A JP2005126811 A JP 2005126811A
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- phosphate
- film
- steel sheet
- chemical conversion
- galvanized steel
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- BFXAWOHHDUIALU-UHFFFAOYSA-M sodium;hydron;difluoride Chemical compound F.[F-].[Na+] BFXAWOHHDUIALU-UHFFFAOYSA-M 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- LLZRNZOLAXHGLL-UHFFFAOYSA-J titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
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Abstract
【解決手段】 亜鉛めっき鋼板又は亜鉛合金めっき鋼板を基材とし、リン酸塩皮膜,界面反応層を介して化成処理皮膜が基材表面に形成されている。界面反応層には、バルブメタルの酸化物又は水酸化物とバルブメタルのフッ化物が界面反応層に共存している。化成処理皮膜は、バルブメタルの酸化物又は水酸化物及びバルブメタルのフッ化物が分散した有機樹脂で形成されている。バルブメタルには、Ti,Zr,Hf,V,Nb,Ta,Mo,W等が挙げられる。リン酸塩皮膜は、被覆率:50面積%以上で形成することが好ましい。
【選択図】 図2
Description
バルブメタルのフッ化物を含むCrフリー化成処理液でリン酸塩皮膜3形成後の亜鉛系めっき層1を処理すると、処理液のエッチング作用によりリン酸塩結晶2の一部が溶解し、溶解したリン酸塩成分が処理液成分と共に亜鉛系めっき層1の露出表面と反応する。反応生成物が界面反応層4となって亜鉛系めっき層1の露出表面を覆う。亜鉛系めっき層1から起立しているリン酸塩結晶2の表面にも粒状の反応生成物5が沈積する(図1b)。
リン酸塩処理液には、リン酸イオンの他に必要に応じてZn,Mn,Mg,Ca,Ni,Co等の金属イオンを添加した水溶液が使用される。処理促進剤として硝酸イオンをリン酸塩処理液に含ませても良い。リン酸塩処理液は、リン酸イオン濃度を0.03〜0.5モル/l,金属イオン濃度を0.01〜0.5モル/lの範囲に調整することが好ましい。硝酸イオンを含ませる場合には、硝酸イオン濃度を0.01〜1.0モル/lの範囲に調整する。
リン酸塩皮膜3は,亜鉛系めっき層1の表面に対して50面積%以上の被覆率で形成することが好ましい。リン酸塩皮膜3の被覆率は膜厚やリン酸塩結晶2のサイズに影響されるが、50面積%以上でリン酸塩皮膜3を設けることにより十分な塗膜密着性,塗装後耐食性が得られる。
Tiソースとしては、KnTiF6(K:アルカリ金属又はアルカリ土類金属,n:1又は2),K2[TiO(COO)2],(NH4)2TiF6,TiCl4,TiOSO4,Ti(SO4)2,Ti(OH)4等がある。Tiソースは、化成処理液を塗布した後で乾燥・焼付けするときに所定組成の酸化物又は水酸化物とフッ化物からなる化成処理皮膜が形成されるように各成分の配合比率が選定される。
リン酸塩を含む化成処理液やオキシカルボン酸やシランカップリング剤が添加された系では、アニオン性又はカチオン性ウレタン樹脂は樹脂粒子が凝集反応を起こしてゲル化することがあるが、ノニオン性ウレタン樹脂ではこのような現象が生じない。この点、ノニオン性ウレタン樹脂の使用が好ましいが、ノニオン性ウレタン樹脂の使用比率を半分以上とすることによりゲル化を起こすことなくアニオン性又はカチオン性ウレタン樹脂も使用できる。
可溶性金属リン酸塩又は複合リン酸塩は、化成処理皮膜から溶出して皮膜欠陥部に溶出し、亜鉛系めっき層1と反応して不溶性リン酸塩を析出することによって、チタンフッ化物の自己修復作用を補完する。また、可溶性リン酸塩が解離する際に雰囲気が若干酸性化するため、チタンフッ化物の加水分解、ひいては難溶性チタン酸化物又は水酸化物の生成が促進される。可溶性リン酸塩又は複合リン酸塩を生成する金属にはアルカリ金属,アルカリ土類金属,Mn等があり、各種金属リン酸塩又は各種金属塩とリン酸,ポリリン酸,リン酸塩として化成処理液に添加される。
亜鉛合金系めっき鋼板のうちAlを含むめっき層が形成されためっき鋼板では黒変色が発生しやすいが、この場合にFe,Co,Niから選ばれた1種又は2種以上の金属塩を皮膜に存在させることにより黒変色を防止できる。また、厳しい加工等によってめっき層に大きなクラックが生じたものでは、フッ化物,リン酸塩の自己修復作用だけでは不充分な場合が生じる。この場合には、Mo,Wの可溶性六価酸素酸塩を皮膜中に多量存在させることにより、六価クロムと同様の作用を発現させてめっき層のクラックを補修し、耐食性を向上させる。
化成処理液には、顔料,潤滑剤となる成分を配合しても良い。
顔料には、酸化チタン,カーボンブラック,炭化カルシウム,アルミナ,酸化亜鉛等の無機顔料やフタロシアニン顔料等の有機顔料がある。顔料を添加する場合、3〜30質量%の範囲で配合量を選定する。顔料配合による着色効果は3質量%以上でみられるが、30質量%を超える過剰量の顔料を配合すると化成処理皮膜が多孔質化して耐食性が低下する。
調製された処理液をリン酸塩処理された亜鉛系めっき鋼板に塗布すると、フッ素イオンと亜鉛系めっき層1又はTiと反応した界面反応層4がリン酸塩結晶2の間にある亜鉛系めっき層1の露出表面に優先的に形成される。界面反応層4は、リン酸塩結晶2のない亜鉛系めっき層1に析出する場合に比較して成長が促進され、自己修復作用のあるフッ化チタンを十分な量含む層となる。
界面反応層4の膜厚は、処理液に含まれるバルブメタルソースの濃度で制御できる。処理液や原板を加温して反応性を高めることによっても界面反応層4を厚膜化できる。処理時間の調整も、界面反応層4の膜厚制御に利用できる。
形成された化成処理皮膜を蛍光X線,ESCA等で元素分析すると、化成処理皮膜に含まれているO及びF濃度が測定される。測定値から算出した濃度比F/O(原子比率)と耐食性との関係を調査したところ、濃度比F/O(原子比率)1/100以上で皮膜欠陥部を起点とする腐食の発生が大幅に減少した。これは、自己修復作用のあるチタンフッ化物が十分な量で化成処理皮膜中に含まれていることによるものと推察される。
(A) 片面当りめっき付着量60g/m2でZn−6質量%Al−3質量%Mgの合金めっき層が形成された板厚0.8mmの溶融めっき鋼板
(B) 片面当りめっき付着量20g/m2でZnめっき層が形成された板厚0.8mmの電気めっき鋼板
〔平坦部腐食試験〕
試験片の端面をシールし、JIS Z2371に準拠して35℃の5%NaCl水溶液を試験片表面に噴霧した。塩水噴霧を240時間又は500時間継続した後、試験片表面を観察し白錆発生状況を調査した。試験片表面に占める白錆の面積占有率が5面積%未満を◎,5〜10面積%を○,10〜30面積%を△,30〜50面積%を▲,50面積%以上を×として平坦部耐食性を評価した。
リン酸塩皮膜が部分的に損傷を受ける180度曲げ加工を施した試験片について,平坦部腐食試験と同じ塩水噴霧を72時間,240時間継続し、加工部に発生した白錆の面積占有率を求めた。面積占有率が5面積%未満を◎,5〜10面積%を○,10〜30面積%を△,30〜50面積%を▲,50面積%以上を×として加工部耐食性を評価した。
化成処理した亜鉛系めっき鋼板をメラミンアルキッド塗装し、膜厚30μmの塗膜を形成した。塗膜にクロスカットを入れ、1000時間の塩水噴霧に供した後、クロスカット部に接着テープを貼り付け瞬時に引き剥がすテープ剥離試験し、塗膜が剥離した幅を腐食幅として測定した。腐食幅が2mm未満を◎,5mm未満を○,10mm未満を△,10mmを超える腐食幅を×として塗装後耐食性を評価した。
Crフリー化成処理後の各亜鉛系めっき鋼板の耐食性を実施例1と同じ試験で調査したところ、平坦部耐食性,加工部耐食性,塗装後耐食性の何れにおいても優れた特性を呈する化成処理鋼板であった。また、化成処理した亜鉛系めっき鋼板に接着剤を塗布し、膜厚300μmのPETフィルムを貼り合わせ、引張試験機を用いて速度:50mm/分で測定したところPETフィルムの剥離強度が80N/20mmを超えており、リン酸塩皮膜による接着性の向上が確認された。
Claims (6)
- 亜鉛めっき鋼板又は亜鉛合金めっき鋼板を基材とし、リン酸塩皮膜,無機質の界面反応層を介して化成処理皮膜が基材表面に形成されており、バルブメタルの酸化物又は水酸化物とバルブメタルのフッ化物が界面反応層に共存し、化成処理皮膜がバルブメタルの酸化物又は水酸化物及びバルブメタルのフッ化物が分散した有機樹脂皮膜であることを特徴とする耐食性,塗装性,接着性に優れた亜鉛系めっき鋼板。
- 基材表面の50面積%以上がリン酸塩皮膜で被覆されている請求項1記載の亜鉛系めっき鋼板。
- Zn,Mn,Mg,Ca,Ni,Coから選ばれた1種又は2種以上の金属がリン酸塩皮膜の析出結晶に含まれている請求項1又は2記載の亜鉛系めっき鋼板。
- Ti,Zr,Hf,V,Nb,Ta,Mo,Wから選ばれた1種又は2種以上の金属をバルブメタルに使用する請求項1記載の亜鉛系めっき鋼板。
- 亜鉛系めっき層から起立するリン酸塩結晶の平均高さに対して10%以下の膜厚で界面反応層が形成されている請求項1記載の亜鉛系めっき鋼板。
- 化成処理皮膜が更に顔料及び/又は潤滑剤を含む請求項1記載の亜鉛系めっき鋼板。
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JP2007002330A (ja) * | 2005-06-27 | 2007-01-11 | Baoshan Iron & Steel Co Ltd | 亜鉛もしくは亜鉛合金めっき鋼板用表面処理剤及び表面処理亜鉛もしくは亜鉛合金めっき鋼板 |
JP2007002327A (ja) * | 2005-06-27 | 2007-01-11 | Nippon Steel Corp | 非クロメート系リン酸塩処理亜鉛めっき鋼板 |
JP2007039736A (ja) * | 2005-08-03 | 2007-02-15 | Nisshin Steel Co Ltd | 耐食性,後塗装性に優れた亜鉛系めっき鋼板 |
JP2007182600A (ja) * | 2006-01-05 | 2007-07-19 | Nisshin Steel Co Ltd | 塗膜の耐水密着性に優れた亜鉛系めっき鋼板 |
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JP2008045185A (ja) * | 2006-08-21 | 2008-02-28 | Nisshin Steel Co Ltd | 耐食性,耐黒変性に優れた化成処理鋼板 |
WO2022044195A1 (ja) * | 2020-08-27 | 2022-03-03 | 日本製鉄株式会社 | 塗装鋼板および塗装鋼板の製造方法 |
CN114807921A (zh) * | 2022-04-02 | 2022-07-29 | 山东鹏博新材料有限公司 | 一种无排放免水洗喷漆镀锌铁制品及其表面处理方法 |
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JP2007002330A (ja) * | 2005-06-27 | 2007-01-11 | Baoshan Iron & Steel Co Ltd | 亜鉛もしくは亜鉛合金めっき鋼板用表面処理剤及び表面処理亜鉛もしくは亜鉛合金めっき鋼板 |
JP2007002327A (ja) * | 2005-06-27 | 2007-01-11 | Nippon Steel Corp | 非クロメート系リン酸塩処理亜鉛めっき鋼板 |
JP2007039736A (ja) * | 2005-08-03 | 2007-02-15 | Nisshin Steel Co Ltd | 耐食性,後塗装性に優れた亜鉛系めっき鋼板 |
JP2007182600A (ja) * | 2006-01-05 | 2007-07-19 | Nisshin Steel Co Ltd | 塗膜の耐水密着性に優れた亜鉛系めっき鋼板 |
JP2007238976A (ja) * | 2006-03-06 | 2007-09-20 | Nippon Parkerizing Co Ltd | 金属材料表面処理用のノンクロメート水系表面処理剤 |
JP2008045185A (ja) * | 2006-08-21 | 2008-02-28 | Nisshin Steel Co Ltd | 耐食性,耐黒変性に優れた化成処理鋼板 |
WO2022044195A1 (ja) * | 2020-08-27 | 2022-03-03 | 日本製鉄株式会社 | 塗装鋼板および塗装鋼板の製造方法 |
CN114807921A (zh) * | 2022-04-02 | 2022-07-29 | 山东鹏博新材料有限公司 | 一种无排放免水洗喷漆镀锌铁制品及其表面处理方法 |
CN114807921B (zh) * | 2022-04-02 | 2024-04-09 | 山东鹏博新材料有限公司 | 一种无排放免水洗喷漆镀锌铁制品及其表面处理方法 |
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