from the conferences organized by TANGER Ltd. provisional website
Galvanizing is an application of a zinc coating on the steel base material by electrolytic deposition. Zn coating protects anodically the base material (typically unalloyed or low-alloy steel) against corrosion. In the final phase of the galvanic process the final finishing employing chromate coating (yellow or blue) is often used. The treatment causes the non-conductivity of the surface coating of the material.Glow Discharge Optical Emission Spectroscopy (GDOES) measures correctly, accurately and with good repeatability the thickness and composition of the zinc coating without the non-conductive surface treatment (chromate). This paper aims to verify the possibilities of the optical emission spectrometry for the analysis of non-conducting surfaces. Optical microscopy is taken as the reference method for the measurement of layer thickness, because this method is generally accepted as an accurate and correct.Keywords: GDOES, galvanizing, zinc coating, chromate, optical microscopy
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