Electrolytic (electroplated) zinc coating is deposited through an electrochemical bath, producing a thinner, more uniform coating than hot-dip galvanizing. For SITC and HTS classification, the process method is determinative: electrolytically plated product falls under a distinct heading from hot-dip or other zinc-coated steel, so the mill certificate or coating specification must confirm the deposition method.

Yes. Flat-rolled steel products, including electrolytically zinc-plated wide coil, are broadly subject to Section 232 national-security tariffs. Antidumping and countervailing duty orders may also apply depending on the country of origin, so importers should verify the current order scope with CBP or a licensed customs broker before entry.