That makes sense. Electro-galvanized, also called zinc coated offers very little corrosion resistance. I work in the the constitution industry and I believe some manufacturers also call this process "mechanically galvanized."
If I recall, the tumble the parts in zinc flakes. I can't remember at the moment. And each manufacturer has their own way of doing things.
It's s completely different process as hot-dipped galvanized, where the part is dipped in molten zinc. This is obviously a more expensive operation, but also more corrosion resistant.
Of course, in a highly corrosive environment, everything corrodes, even stainless steels.
This is basically what I'm finding on Google as well, except most places mention that zinc plating (electro-galvanizing) involves dipping parts in a cold chemical solution of zinc and running electricity through them where as hot-dip galvanizing is done at high temperatures. Apparently zinc plating provides a much thinner finish than hot dip galvanizing.
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