With thermal coating large steel structures in the offshore area can be protected permanently against seawater corrosion. A great advantage compared to varnishing exists in self-healing of thermal coating which means that minor surface damage heal independently due to the electrolytic effect between the base material and the zinc coating applied.
“The components employed in offshore wind turbines are usually made of low-alloyed structural steels. To be able to achieve long-lasting corrosion protection throughout the overall planned service life of 25 years, Duplex systems play a key role consisting of a combination of an arc-wire sprayed zinc-aluminium 15 (ZnAl15) coating and a suitable organic cover coat. For applying such coating, arc- wire spraying is the most commonly applied procedure, as it allows high melting rates and thus high area output,” said Dr. Frank Prenger, Grillo-Werke AG. For this application state-of-the-art arc-wire spraying systems offer top quality, tight coating tolerances and a sustainable corrosion protection.”
And in fact, corrosion protection is one the most frequent applications for thermal spraying. Within machinery and equipment corrosion protection provides for extended lifetime and thus ideally for a production advantage.