JP6882340B2 - 亜鉛表面または亜鉛合金表面上に化成皮膜を作製するための水性処理溶液、当該水性処理溶液を調製するための濃縮物、当該濃縮物を含むキット、及び、当該水性処理溶液を接触させることにより、亜鉛皮膜または亜鉛合金皮膜を有するワークピース上に化成皮膜を作製する方法 - Google Patents
亜鉛表面または亜鉛合金表面上に化成皮膜を作製するための水性処理溶液、当該水性処理溶液を調製するための濃縮物、当該濃縮物を含むキット、及び、当該水性処理溶液を接触させることにより、亜鉛皮膜または亜鉛合金皮膜を有するワークピース上に化成皮膜を作製する方法 Download PDFInfo
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- JP6882340B2 JP6882340B2 JP2018559818A JP2018559818A JP6882340B2 JP 6882340 B2 JP6882340 B2 JP 6882340B2 JP 2018559818 A JP2018559818 A JP 2018559818A JP 2018559818 A JP2018559818 A JP 2018559818A JP 6882340 B2 JP6882340 B2 JP 6882340B2
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- treatment solution
- zinc
- chemical conversion
- film
- ions
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
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Description
本発明は、金属材料、特に亜鉛含有表面の腐食保護に関する。
先行技術では、金属材料表面を腐食性の環境影響から保護するために種々の方法が提供されている。この技術分野において広く普及しかつ確立された方法が、保護すべき金属ワークピース上に金属被覆を適用することである。例えば、鉄製および鋼製のワークピースは、腐食性の環境影響から保護するために亜鉛めっきまたはカドミウムめっきされる。この場合、コーティング金属は、腐食性の媒体中で母材金属単独よりも電気化学的に貴にまたは卑に挙動する。コーティング金属がより卑に挙動する場合、このコーティング金属は、腐食性の媒体中でカソード腐食保護の意味でベース金属に対して犠牲アノードとして作用する。亜鉛の腐食保護は、亜鉛がベース金属よりもさらに卑であり、したがって、最初にそれ自体が腐食性の攻撃を受け止めることに基づく。この保護機能はたしかに望ましいが、この被覆の腐食生成物はしばしば、ワークピースの装飾的な特性を不要に損なわせ、それに機能的な特性を損なわせることも希ではない。
− 0.1g/l〜8.0g/lの量のCr(III)イオン、
− 0.1g/l〜15g/lの量のジルコニウムイオンおよび/またはチタンイオン、
− 0.1g/l〜50g/lの量のオルガノシラン修飾シリカナノ粒子、
− 0.1g/l〜15g/lの量のフッ化物イオン
を含有する。
− 0.15g/l〜6g/l、特に好ましくは0.2g/l〜5g/lの処理溶液中のCr(III)イオンならびに/または
− 0.15g/l〜10g/l、特に好ましくは0.2g/l〜8g/lのジルコニウムイオンおよび/もしくはチタンイオンならびに/または
− 0.2g/l〜40g/l、特に好ましくは0.3g/l〜30g/lのオルガノシラン修飾シリカナノ粒子ならびに/または
− 0.15g/l〜15g/l、特に好ましくは0.2g/l〜10g/lのフッ化物イオン。
実施例1で調製した処理溶液を亜鉛被覆鋼板の処理に用いた。この鋼板は、ここでは市販のSurTec(登録商標)704でアルカリ性シアン化物を含まずに調製した。処理パラメータは、以下のように設定する:
実施例2で得られた処理鋼板の腐食保護特性を、ISO 9227およびASTM B117−73に従った塩水噴霧試験によって調べた。ここでは、次の結果が得られる:
エネルギー分散型X線分光法(EDX)により組成を測定する。測定結果を以下の表に示す。
本発明により不動態化された亜鉛表面上の元素の重量割合を、20kVの励起電圧でエネルギー分散型X線分光法(EDX)により測定し、EDAX Genesis V5.11により評価した。
Claims (15)
- 亜鉛表面または亜鉛合金表面上に化成皮膜を作製するための水性処理溶液であって、該処理溶液は、
− 0.1g/l〜8.0g/lの量のCr(III)イオン、
− 0.1g/l〜15g/lの量のジルコニウムイオンおよび/またはチタンイオン、
− 0.1g/l〜50g/lの量のオルガノシラン修飾シリカナノ粒子、
− 0.1g/l〜15g/lの量のフッ化物イオン
を含有し、1mg/l未満のクロム(VI)イオンの割合および10mg/l未満のコバルトイオンの割合を有し、かつ、水分散性のポリウレタン樹脂を含まない、処理溶液。 - 10mg/l未満のNiイオンの割合を有することを特徴とする、請求項1記載の処理溶液。
- 前記オルガノシラン修飾シリカナノ粒子が、凝集シリカのコアを有し、該コアの表面上に有機シラン化合物が配置されていることを特徴とする、請求項1または2記載の処理溶液。
- 前記シリカナノ粒子の表面上の酸素原子が、エポキシシラン、アミドシラン、ウレイドシラン、アミノシラン、エステルシラン、メルカプトシランおよび/またはイソシアネートシランのケイ素原子と共有結合して存在することを特徴とする、請求項1から3までのいずれか1項記載の処理溶液。
- 前記シラン修飾ナノ粒子が、5〜50nmの平均粒径を有することを特徴とする、請求項1から4までのいずれか1項記載の処理溶液。
- 前記処理溶液中で、一方のCr(III)イオンの、他方のジルコニウムイオンおよび/またはチタンイオンに対するモル比が、0.1〜2.0であることを特徴とする、請求項1から5までのいずれか1項記載の処理溶液。
- 1.5〜5のpH値を有することを特徴とする、請求項1から6までのいずれか1項記載の処理溶液。
- 10重量%未満の揮発性有機化合物(VOC)の含有率を有することを特徴とする、請求項1から7までのいずれか1項記載の処理溶液。
- 前記処理溶液の全重量を基準として、少なくとも50重量%の水で希釈することによって前記処理溶液を調製することを可能にする作用物質濃度を有することを特徴とする、請求項1から8までのいずれか1項記載の処理溶液を調製するための濃縮物。
- 前記処理溶液の全重量を基準として、少なくとも70重量%の水で希釈することによって前記処理溶液を調製することを可能にする作用物質濃度を有することを特徴とする、請求項1から8までのいずれか1項記載の処理溶液を調製するための濃縮物。
- 異なる組成の請求項9または10記載の少なくとも2つの濃縮物を含むキット。
- 亜鉛皮膜または亜鉛合金皮膜を有するワークピース上に化成皮膜を作製する方法であって、処理すべき前記ワークピースを、請求項1から8までのいずれか1項記載の処理溶液と接触させる、方法。
- 作製された化成皮膜が、元素Cr、Si、O、F、C、H、ならびにZrおよび/またはTiからの化合物を含有することを特徴とする、請求項12記載の方法。
- 前記化成皮膜中のジルコニウムおよび/またはチタンの重量割合がクロム割合よりも高いことを特徴とする、請求項12または13記載の方法。
- 100nm〜1000nmの平均皮膜厚さを有することを特徴とする、請求項12から14までのいずれか1項記載の方法。
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DE102022105844A1 (de) | 2022-03-14 | 2023-09-14 | Carl Freudenberg Kg | Passivierungsschicht für metallhaltige Substrate |
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