Tower GalvanizingA previously-syndicated Fact-of-the-Day
Galvanizing is a name given to the process of coating a metal with a different metal. The most common galvanizing is zinc coated on steel or iron. Most zinc galvanizing is accomplished by quickly dunking steel or iron into a hot bath of zinc. Some of the zinc drips off, but a thin layer remains. The dunking process is repeated two or three times if a thicker coat is wanted. Most steel tower members are coated with zinc in this way, because zinc is higher than steel in the electrochemical series, causing zinc to be eaten away before steel is. Even if a zinc coating is scratched sufficiently to expose bare steel, most corrosion of the underlying steel is delayed until all adjacent blobs of zinc around the exposed area are depleted. ©2004 Martek International All rights reserved.
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