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Not very scientific. I used to help make the stuff so this stuck in my mind. I think it was Chicago and I remember it was the offices of a steel company. It was reported that when the air pollution was reduced the rust washed off the Corten and stained the footwalk brown. Peter Hutchison ----- Original Message ----- From: "Kinder, Joachim" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, February 23, 2009 1:37 PM Subject: AW: Weathering steel (Cor-ten) conservation. Dear Arantza, as metallurgist I did a tiny bibliographic research in the past mainly to receive information about the reason of Cor-ten steel to be more or less corrosion-resistant. From that little research I remember that during the formation of rust on the surface of a corroding steel the alloyed Cu will form a subsurface-layer below the rust because of its noble character. Problematic are surfaces of sculptures etc. which are oriented horizontally. In this case for example rain water will pond for a while and this leads to a penetration of the Cu-layer thereby promoting corrosion. Because this bibliographic research happens in the early 90ties I do not have the old results available. Some years ago I conducted a scientific research regarding the cleaning of old metallic surfaces which were formed during manufacturing (i.e. casting skulls on cast iron and hammer scale on steels). The cleaning experiments were done by the German company Kaercher (see: www.karcher.com) with blasting techniques using high water pressure or high-pressure dry-ice particles. Both techniques were able to clean the rusted and somewhat dirty surface of the testing specimen sufficiently without affecting the old oxide surface layer too much. But of course the rust was fully removed which definitely will not be your intention! I can provide you with a little publication about my cleaning examination which was prepared for an international conference in Slovakia in 2006 in English language if you like. Perhaps it might be possible to do some examinations together with Kaercher but this time on dirty Cor-ten steel surfaces in order to find-out proper parameters for cleaning such rust surface without removing the wanted rusty surface too much ... Kind regards! Dr. Joachim Kinder Materialprüfungsanstalt Universität Stuttgart - Materials Testing Institute of University Stuttgart - (MPA Stuttgart - Otto-Graf-Institut (FMPA)) Department 52350 - Failure Analysis in Mechanical Engineering Pfaffenwaldring 32 D-70569 Stuttgart Phone: +49 (0) 711 685-6 03 11 Fax: +49 (0) 711 685-6 39 01 e-mail: [log in to unmask] Internet: http://www.mpa.uni-stuttgart.de -----Ursprüngliche Nachricht----- Von: Arch-Metals Group [mailto:[log in to unmask]] Im Auftrag von Arantza Garcia Gesendet: Donnerstag, 19. Februar 2009 09:06 An: [log in to unmask] Betreff: Re: Weathering steel (Cor-ten) conservation. Hello, Thank you very much for the bibliography suggestion. It is a pity it is in German. I will try to get someone to translate the contents. Thanks! best Arantza García Dpto. de Conservación Museo Guggenheim BILBAO Tel: 00. 34. (9) 403 91 26 / Fax: 00.34.(9) 435 90 61 e-mail: [log in to unmask] -----Mensaje original----- De: Arch-Metals Group [mailto:[log in to unmask]] En nombre de [log in to unmask] Enviado el: jueves, 19 de febrero de 2009 8:57 Para: [log in to unmask] Asunto: Re: Weathering steel (Cor-ten) conservation. here is a topic about this: http://www.nextroom.at/publication_preview.php?picture_id=463&publication_id=799&box1_id=-1#annex > Hello all, > > I would like to get in contact with professionals dealing with > conservation and > maintenance of weathering steel (Cor-ten steel) sculptures or > structures > (exhibited indoors and/or outdoors). > > We are currently carrying out research into the deterioration and > conservation > of weathering steel (Cor-ten) sculptures. An area of specific > interest in the > project is the problem of graffiti, (protective treatments and their > removal) > > Any suggestions would be greatly appreciated. > Thanks > > Best > Arantza. 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