Comparative investigation on thermal corrosion of alloy coatings in simulated waste incinerator environment

The thermal corrosion test and ash adhesion test were performed in this work to quantify the corrosion resistance of coatings prepared by plasma transferred arc welding (PTA), twin wire arc spray (TWAS) and high-velocity oxygen-fuel spray (HVOF) technologies. Results showed that TWAS coatings would fall off above 550 degrees C. PTA and HVOF coatings were excellent even at 650 degrees C. For HVOF-NiCr coatings, as Cr content increased from 7.22 % to 21.55 %, the corrosion resistance was enhanced linearly. This study revealed the anti-corrosion mechanism and provided a guidance for coating application in boilers.

Automated summary

The study quantified the corrosion resistance of coatings prepared by different technologies under high temperature conditions through thermal corrosion and ash adhesion tests. Results showed that TWAS coatings had poor corrosion resistance, while PTA and HVOF coatings performed well at higher temperatures. Furthermore, the study on HVOF-NiCr coatings revealed a linear enhancement in corrosion resistance with the increase of Cr content.