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topic 9142

EMISSIVITY OF ALOCROM


(2001)

Mathematical modelling of equipment enclosures is fast becoming a necessity if the professional Engineer wants to investigate Thermal Capacity of Equipment Enclosures. My particular question relates to the EMISSIVITY of ALOCROM. Various coatings can effect the amount of radiated heat from a housing. Various publications give figures as indicated below :

Polished Aluminium - 0.06,

Iridited Aluminium - 0.07,

Anodized Aluminium 0.81,

Aluminium Oxide - 0.33 .etc

However, I have been unable to find any figures relating to ALOCROM.

Can you please help?

BOB KNAPP
BAE SYSTEMS - ESSEX, U.K.


September 11, 2009

Have you managed to find this data? I am looking for the same information.

Richard Bennett
UK Astonomy Technology Centre - Edinburgh, U.K.


September 11, 2009

Hi. Alochrom is a Henkel trade name for chromate conversion coating of aluminum. Iridite is a Macdermid trade name for chromate conversion coating of aluminum. So, in one way, they are on the same approved products lists, and are essentially the same thing, and should have equivalent emissivity.

But the complication is that both Alochrom and Iridite are trade names for a range of such processes, not a single process. for example, both type 1 and type 3 conversion coating. I think it will prove necessary to specify a specific Alochrom like Alochrom 1200. Henkel may have this data.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



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