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1.发明公开
公开(公告)号：EP0719350A1
公开(公告)日：1996-07-03
申请号：EP94927443.0
申请日：1994-09-12
发明人： HUGHES, Anthony Ewart , NELSON, Karen Joy Hammon , TAYLOR, Russell James , HINTON, Bruce Roy William , HENDERSON, Mark Julian , WILSON, Lance , NUGENT, Sally Ann
摘要： The invention provides a process for cleaning a metal surface including the steps of: (a) contacting the metal surface with an alkaline cleaning solution in order to remove contaminants such as dirt and grease; and (b) contacting said metal surface with an acidic, rare earth ion containing cleaning solution thereby to remove smut formed on said metal surface by step (a). The process may be used to prepare a metal surface for a subsequent coating process which includes the further step of: contacting the metal surface with an aqueous, acidic, rare earth ion containing coating solution including rare earth cations capable of having more than one valence state, resulting in an increase of the pH of the coating solution in the region of the metal surface to a value sufficient to precipitate one or more compounds of the rare earth element, thereby to cause the compound of the rare earth element to precipitate in a coating on the metal surface. The present invention also provides an acidic, rare earth ion containing aqueous cleaning solution for use in step (b) of the process of the invention, said solution including ions of one or more rare earth elements in an amount effective to remove smut from a metal surface previously contacted with an alkaline cleaning solution. The invention also extends to a metal surface, treated by the process of the invention.
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公开(公告)号：EP0769080B1
公开(公告)日：2000-09-20
申请号：EP95921651.6
申请日：1995-06-09
发明人： NELSON, Karen Joy Hammon , TAYLOR, Russell James , HUGHES, Anthony Ewart , HINTON, Bruce Roy William , HENDERSON, Mark Julian , WILSON, Lance , NUGENT, Sally Ann
摘要： A process for forming a conversion coating on the surface of a metal, including: contacting the metal with an acidic solution containing an oxidant in order to initiate growth of a metal oxide cell structure on the metal surface; contacting the metal with water for a period of time sufficient to thicken the oxide and form a metal oxide containing layer of a desired thickness; and treating the metal with one or more rare earth elements in order to impregnate and substantially seal the metal oxide.
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3.发明授权
公开(公告)号：EP0719350B1
公开(公告)日：2002-01-09
申请号：EP94927443.5
申请日：1994-09-12
发明人： HUGHES, Anthony Ewart , NELSON, Karen Joy Hammon , TAYLOR, Russell James , HINTON, Bruce Roy William , HENDERSON, Mark Julian , WILSON, Lance , NUGENT, Sally Ann
摘要： The invention provides a process for cleaning a metal surface including the steps of: (a) contacting the metal surface with an alkaline cleaning solution in order to remove contaminants such as dirt and grease; and (b) contacting said metal surface with an acidic, rare earth ion containing cleaning solution thereby to remove smut formed on said metal surface by step (a). The process may be used to prepare a metal surface for a subsequent coating process which includes the further step of: contacting the metal surface with an aqueous, acidic, rare earth ion containing coating solution including rare earth cations capable of having more than one valence state, resulting in an increase of the pH of the coating solution in the region of the metal surface to a value sufficient to precipitate one or more compounds of the rare earth element, thereby to cause the compound of the rare earth element to precipitate in a coating on the metal surface. The present invention also provides an acidic, rare earth ion containing aqueous cleaning solution for use in step (b) of the process of the invention, said solution including ions of one or more rare earth elements in an amount effective to remove smut from a metal surface previously contacted with an alkaline cleaning solution. The invention also extends to a metal surface, treated by the process of the invention.
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公开(公告)号：EP0769080A1
公开(公告)日：1997-04-23
申请号：EP95921651.0
申请日：1995-06-09
发明人： NELSON, Karen Joy Hammon , TAYLOR, Russell James , HUGHES, Anthony Ewart , HINTON, Bruce Roy William , HENDERSON, Mark Julian , WILSON, Lance , NUGENT, Sally Ann
IPC分类号： C23C22
摘要： A process for forming a conversion coating on the surface of a metal, including: contacting the metal with an acidic solution containing an oxidant in order to initiate growth of a metal oxide cell structure on the metal surface; contacting the metal with water for a period of time sufficient to thicken the oxide and form a metal oxide containing layer of a desired thickness; and treating the metal with one or more rare earth elements in order to impregnate and substantially seal the metal oxide.
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