Abstract
The heat produced by incinerator plants can be used to produce electricity and district heating. Metallic components, e. g. heat exchangers, are exposed to a highly corrosive atmosphere. Gases with particularly high chlorine contents lead to the very quick wear of the base material and define the service time and are the main reason for high maintenance costs. Spraying a corrosion-protective coating on conventional steel gives the possibility to improve the performance of the surface significantly. Due to its easy handling and low operating costs, wire arc spraying has become one of the most established processes. The thermal spray Ni- and Co-based coating alloys are state of the art. The substitution of these materials by Fe-based alloys will lead to a noticeable economic benefit. The latest research activities proved that the addition of silicon raises the corrosion resistance in comparison to FeCr- and NiCr-based alloys. In order to verify the potential of these materials, flux-cored wires with different compositions were manufactured and were applied by means of arc spraying. Subsequently, corrosion investigations were conducted on the specimens in an atmosphere containing chlorine.
