"Jim Wilkins" wrote in news:nlr5b5$ain$1@dont-
email.me:

"Ian Malcolm" wrote in message
...
Larry Jaques wrote in
:

So, my kW of solar panels came in. The frames and z-brackets are
aluminum and the hardware (5/16x2-1/2" lags and 1/4-20 bolts) is
304
stainless. I picked up Unistrut to hold it and it has galvanized
nuts. Will there be hell to pay from electrolysis, and, if so, is
there any way to mitigate it? Rubber discs under the washers?

Use original Duralac anticorrosive jointing compound on all
fasteners.
http://www.llewellyn-ryland.co.uk/duralac.html
snip
Barium Chromate, its active ingredient, is known to the State of New
Jersey to be toxic and potentially carcinogenic, and they are our
experts on hazardous waste spills. .
http://nj.gov/health/eoh/rtkweb/documents/fs/3074.pdf

Yep. Chromates are generally highly toxic. However most Barium salts are
virtually insoluable, and Duralac has an organic binder which minimises
leeching out of the joint. It has a long track record as a reliable
anti-corrosion jointing compound in the aviation and marine industries,
and as long as its stored safely, applied in accordance with its safety
instructions and any excess is carefully cleaned up and the waste
disposed of in accordance with local HAZMAT regulations, is minamally
hazardous.

There is also the reformulated Chromate free Duralac Green, but it
doesn't have anywhere near as long a track record. However if local
regulations prohibit Chromates, its probably your best option.


--
Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk
[at]=@, [dash]=- & [dot]=. *Warning* HTML & 32K emails -- NUL