Inspection
Passivation Testing
The specification to determine the presence of chromate on zinc surfaces is ASTM B 201. This test involves placing drops of a lead acetate solution on
Bending Test
The hot-dip galvanized coating on a steel bar must withstand bending without flaking or peeling when the bending test is preformed in accordance with the
Zinc Skimmings
Zinc skimming deposits are usually caused when there is no access to remove the zinc skimmings during the withdrawal of the steel from the galvanizing
Weeping Weld
Weeping welds stain the zinc surface at the welded connections on the steel. Caused by entrapped cleaning solutions that penetrate the space between the two
Surface Contaminant
Surface contaminants will create an ungalvanized area where the contaminant was originally located, and a surface defect may occur. This can be caused by paint,
Striations
Striations are characterized by raised parallel ridges in the galvanized coating, which can be caused by the chemical composition of the steel. Striations, as seen
Sand Embedded in Castings
Sand inclusion defects occur when sand becomes embedded in the castings and creates rough or bare spots on the surface of the galvanized steel. Sand
Runs
Runs are localized thick areas of zinc on the surface. Runs occur when zinc freezes on the surface of the product during removal from the
Rough Surface Condition
Rough surface condition or appearance is a uniformly rough coating with a textured appearance over the entire product. The cause for rough surface condition could
Products in Contact/Touch Marks
A type of surface defect is caused when steel parts come in contact with one another or are stuck together...
