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I have TIG welded regular 304 stainless (not extra-low carbon 304L,316L) to copper and it has been in service in an acidic wet environment for many years with no issues. The joint is washed down 5 times a week with chlorinated tap water.
Almost every refrigeration unit has copper tube brazed to aluminum tube. Sure, it may fail someday, but the compressor usually dies many years before and the joint is redone at that point.
If my fixture starts to grow a patina on it I'll laugh, then have to take it apart for cleaning. Din't read the articles, but I did remove the finish from the heatsinks when I sanded the mounting surface smooth. Now it is protected by a layer of Aluminum Oxide, that's hard stuff. The same thing Ruby's are made of? I suppose I could use all copper heatsinks on top, the problem is that I'm short one, even if I use one of the heatsinks made of a mixture of aluminum clad with copper. I have half a dozen heatsinks with copper bases under the less expensive aluminum top but decided against them since they have heatpipes with fins that want a cross breeze which I'm not designing my fixture for.
So sure, take the warning about galvanic corrosion. It is real and I see it all the time, but as geeky as this group is, upgrading their COB's every year for a more efficient model you probably won't have to worry about galvanized steel corroding with the aluminum heatsinks. If concerned use an anti-sieze compound on the threads. Or grease if you can't find any, or blue loc-tite 242 which is what I'll use on the stainless screws threading into aluminum.
If really concerned about the galvanized parts, go to a store that specializes in bolts, not a home depot type store and they will cost a fraction and have all the right sizes with the types of heads you choose.
I got the munchies, think I am going to go start cooking dinner on my Williams Sonoma All- clad copper -stainess cookware set.
