Aluminium contact with mercury or mercury compounds is a real no no as it causes severe embrittlement in the form of SCC. As I remember from practical demonstration in my metallurgy classses the reaction is very severe and causes the metal to virtually fall apart.
If someone has developed such an alloy, then it would be by using some form of barrier coating.
In oil and gas the presence of mercury has caused some failure in equipment with parts in aluminium. Has a general recomendation Al should be avoided if mercury is present in the process fluids.
a spectacular failure of a aluminum HX in australia ( LNG liquifaction) 2 yrs ago, due to failure of the process to remove all Hg from the source gas. 6 Mos outage ( these HX's are hard to come by).
Observe all the warnings mentioned above.
If there is some need to use aluminum in an Hg-containing environment, I suggest that the best barrier coating would be Micro arc oxide (MAO) aka Plasma Electrolytic Oxidation (PEO) + PTFE copolymer + PTFE.
I.e., Keronite[®] + Teflon.[®]
On this site you can find what is probably the most important and complete report on materials selection and impact of mercury on Corrosion and Materials Selection.
Dig through your copy of Metals Handbook vol 11 (Failure Analysis) and you'll find a beautiful example of liquid metal embrittlmeent that occurs when aluminum is exposed to mercury. I agree with th eother postings that say Hg + Al = NoNo.
As an engineer in Petrochem, the OP question had my alarm bells ringing too!
We recently spent some bucks installing mercury removal beds due to a feed slate change - we have several Al plate finned hX's that otherwise would have been compromised.
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