Using the new QNix® 9500 Paint Thickness Gauge to measure Galvanize coatings / Duplex coating systems.

We all know the damages the different types of corrosion cause on steel metal structures every year if preventive measures are not taken. One such preventive measure is galvanizing. Galvanic corrosion occurs when two non-similar metals with physical or electrical contact come in with a common electrolyte such as saltwater. The more active metal – also known as the anode corrodes faster than the more noble metal - the cathode. Corrosion experts use several methods to prevent corrosion, among others, the use of a sacrificial anode to provide a cathodic protection system. For example, a sacrificial anode layer of zinc is applied to the surface of a fabricated steel part, providing corrosion protection, with the thickness of the galvanized coating having a direct correlation to the life span – service life of the steel structure. A layer of paint or powder coating is also added to the zinc layer, making a duplex system. The inspection of both coating thicknesses is believed t...