Solidified zinc runs

This phenomna usually occurss with large frames with many stiffeners.  There are two aspects to this:

1. Solidified zinc run- left hand side of insert picture – the zinc is flowing too slowly and the zinc freezes before it can fully run off.  This is not detrimental to the coating and if it does not interfere with the use of the srticle, then it is acceptable.  Larger vent holes would avoid this.  The extra zinc acts like an anode and will give enhanced protection.

2. Dross collection – right hand side of insert –  when the ‘river’ of zinc slows to drain through the small vent snipes, it drops suspended particles called dross particles.  These are 80% zinc with a small portion of iron in them and are not deterimental to the coatings life.  Larger vent snipes will avoid this.  This is acceptable as long as it does not interfere with the intended use of the article.

run, collection, zinc, rough, pimples, lumpy

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