JP5231635B2 - 金属基体上の耐食性ハイブリッドゾルゲル膜及びそれの調製方法 - Google Patents
金属基体上の耐食性ハイブリッドゾルゲル膜及びそれの調製方法 Download PDFInfo
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- JP5231635B2 JP5231635B2 JP2011510086A JP2011510086A JP5231635B2 JP 5231635 B2 JP5231635 B2 JP 5231635B2 JP 2011510086 A JP2011510086 A JP 2011510086A JP 2011510086 A JP2011510086 A JP 2011510086A JP 5231635 B2 JP5231635 B2 JP 5231635B2
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Description
本発明は、ゾルゲルコーティング配合物であって、亜鉛で被覆された基体及び亜鉛合金で被覆された基体に施された後、該基体の耐食性を改善するコーティング配合物を示す。ゾルゲル配合物の被覆性能は、無機化合物、とりわけ、メタバナジン酸ナトリウムを添加することによって更に改善される。ゾルゲルコーティングは、耐食性を改善するだけでなく、金属表面に疎水性表面特性を提供する。
本発明のもう1つの目的によると、亜鉛基体及び亜鉛合金基体のサンプルであって、その上に新規なコーティング配合物が施されるサンプルが調製される。
本発明の更にもう1つの目的は、触媒として用いられる酢酸又は希硝酸を添加して、ゾルゲル溶液の加水分解反応を開始することである。
加水分解可能なケイ素アルコキシドと、バナジウム酸ナトリウム溶液とからのゾルゲルの混合物であって、ビーカー内でコロイドシリカと混ぜ合わされ、そして激しく撹拌して混合物を調製する工程と、
シリカ前駆体とコロイドシリカとの間に2つの分離相が形成されて20秒以内に、触媒としての酢酸又は希硝酸を添加して、ケイ素アルコキシドの加水分解反応と、前記ゾルゲル組成物の縮合反応とを開始する工程と、
前記混合物を24時間の間、連続的に撹拌して、単一相溶液を形成する工程と、
清浄化された、亜鉛又は亜鉛合金で被覆された金属基体の上に、前記単一相溶液を施して、透明なゾルゲルコーティング膜を形成する工程と、
前記被覆済み基体を、50℃〜200℃で10〜60分間の間乾燥させる工程と、
を含む、上記調製方法が提供される。
本研究では、それぞれ、亜鉛めっき材料及びガルバニール処理(galvannealed)材料として商業的に知られている亜鉛基体及び亜鉛合金基体を用いた。亜鉛めっき材料が、純亜鉛のコーティングであるのに対して、ガルバニール処理材料は、コーティング配合物中に鉄を約10%含有している亜鉛−鉄合金である。材料は、先ず、アルカリで洗浄され、次いで、水道水で洗浄され、次いで、脱塩水で更に洗浄され、次いで、乾燥された。基体は、任意的に、イソプロパノール等の有機溶媒の中で、超音波処理によって更に清浄化され得る。
蒸留水10mlに、バナジン酸ナトリウム化合物1.5mgを添加した。バナジン酸ナトリウムは、水には不溶性であり、従って、激しく撹拌しながら、硝酸1滴を添加した。上記溶液を、50℃に加熱し、次いで、バナジン酸ナトリウムが水に完全に溶解するまで、連続的に撹拌し続けた。淡黄色のバナジン酸ナトリウム溶液が観察された。該溶液は、周囲温度でガラス容器に入れて保存された。このバナジン酸ナトリウム溶液を、適切な量、ゾルゲル配合物に添加して、ゾルゲル配合物の耐食性を改善した。
提案される、ゾルゲルコーティング配合物の調製に関する本発明は、次の諸実施例に例示される。
本明細書に記述され例示された本発明は、特許請求の範囲に規定された本発明の範囲内で、様々な用途、代替物及び一部変更が可能であるので、限定的方法で理解され解釈されるべきではない。
Claims (7)
- 亜鉛又は亜鉛合金で被覆された金属基体の上に、耐食性のハイブリッドゾルゲル膜コーティングを調製する方法において、
加水分解可能なケイ素アルコキシドと、バナジウム酸ナトリウム溶液とからのゾルゲルの混合物であって、ビーカー内でコロイドシリカと混ぜ合わされ、そして激しく撹拌して混合物を調製する工程と、
シリカ前駆体とコロイドシリカとの間に2つの分離相が形成されて20秒以内に、触媒としての酢酸又は希硝酸を添加して、ケイ素アルコキシドの加水分解反応と、前記ゾルゲル組成物の縮合反応とを開始する工程と、
前記混合物を24時間の間連続的に撹拌して、単一相溶液を形成する工程と、
清浄化された、亜鉛又は亜鉛合金で被覆された金属基体の上に、前記単一相溶液を施して、透明なゾルゲルコーティング膜を形成する工程と、
前記被覆済み基体を、50℃〜200℃で10〜60分間の間乾燥させる工程と、
を含む、上記調製方法。 - 前記ケイ素アルコキシドは、トリメトキシメチルシラン(TMMS)、テトラエチルオルトシリケート(TEOS)、メチルトリエトキシシラン(MTES)、エチルトリエトキシシラン(ETES)、及びテトラメトキシシラン(TMOS)であって、単独又は組合せで添加される、請求項1に記載の方法。
- 前記コロイドシリカは、表面積が200〜300m2/gのナノ粒子シリカゾルであり、且つ、前記コロイドシリカのpHは、8.5〜10の範囲である、請求項1に記載の方法。
- 前記バナジウム酸ナトリウム溶液は、バナジウム酸ナトリウム化合物1.5mgに対して蒸留水を10mlの割合で添加し、前記バナジウム酸ナトリウムが水に完全に溶解するように、硝酸を添加し、次いで、その内容物を50℃で連続的に激しく撹拌することによって淡黄色のバナジウム酸ナトリウム溶液を形成し、この溶液を周囲温度まで冷却することによって調製される、請求項1に記載の方法。
- トリメトキシメチルシラン(TMMS)とテトラエチルオルトシリケート(TEOS)との溶液を混合して、コロイドシリカと混ぜ合わせて激しく撹拌すること、2つの分離相が形成されて20秒以内に、前記の溶液の混合物に、触媒としての酢酸を添加すること、前記混合物を24時間連続的に撹拌して単一相溶液を形成すること、結果として得られた溶液を、亜鉛又は亜鉛合金で被覆された鋼基体の上に施すこと、次いで、前記基体を60〜200℃で、20〜30分間乾燥させることによって、前記ゾルゲル膜コーティング膜を形成する、請求項1に記載の方法。
- 前記金属表面は、亜鉛で被覆された鋼材、亜鉛合金で被覆された鋼材、亜鉛めっき鋼材、又はガルバニール処理された亜鉛合金鋼材である、請求項1に記載の方法。
- 請求項1に記載の方法によって生成される、透明のゾルゲルコーティング組成物。
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