Drainage spikes or drips are teardrops of zinc along the edges of a product. These are caused when steel products are removed from the galvanizing kettle horizontally preventing proper drainage of the zinc from the surface (Figure 18). Drainage spikes are typically removed during the inspection stage by a buffing or grinding process. Comprised of excess zinc, drainage spikes and drips will not affect corrosion protection, but are potentially dangerous for anyone who handles the parts. Therefore, these defects must be removed before the part can be accepted.
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