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 | | From: | Marty | | Subject: | World Trends in Aluminium pretreatments | | Date: | 11 Jan 2005 21:38:16 -0800 |
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 | I am researching the world trends in aluminium finishing and the use of
alternative methods due to the banning of chromate pretreatments
If anyone can point me towards and useful and concise information about
the following ;
1) The current world trends in the banning of chromate 6 in the coating
and pretreatment processing of aluminium.
2) Environmental and Health issues for the use of PVDF and PVF2 paints
and world trends on the furture of these paints
3)Europe and US leading the world industry and working "green".
4)Alternative methods of pretreatment of aluminium to chromate and how
they rate for environment/health and safety Vs weatherabilty, adhesion
etc of aluminium coatings Vs cost and which companies are geared up to
undertake these alternatives.
5) The use of anodizing as a pretreatment, pro's/con's, effectivness,
cost effectiveness, who does - Asia?.
6) Documentation on alternatives to the above (5)
Thank you
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| | From: | Marty | | Subject: | Re: World Trends in Aluminium pretreatments | | Date: | 20 Jan 2005 00:24:51 -0800 |
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| Thanks for the reply Jitney
I will check the Molybdates and manganates out.
FYI the application is for architectural aluminium sections
Cheers
Marty
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| | From: | jtnospam at yahoo.com | | Subject: | Re: World Trends in Aluminium pretreatments | | Date: | 18 Jan 2005 01:00:52 -0800 |
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| I've heard that there has been some work on Molybdates and Manganates,
but not much else. As with so many of these substitutions, oftentimes
the materials selector has to accept an inferior product or process.
As for anodizing, apart from the other issues, one is limited by the
physical size of the anodizing tank, analogous to the problem of
galvanizing steel. Applied coatings can be applied in the field to just
about any size of object.
That said, in the particular case of chromates, I agree with the need
to avoid human and environmental exposure where practical. In many
cases, it was applied where it wasn't needed just because of
longstanding practice where an ordinary paint or even bare aluminum
would have worked just fine. In some places, FRP or plastic composite
can replace the aluminum. Each situation's needs and economics will
dictate a tailored solution rather than a wholesale substitution,
IMO.-Jitney
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