| Abstract Scope |
In our work, SiON coatings were created using perhydropolysilazane (PHPS) on the weld region and the base stainless steel region with different microstructures and compositions. The influences of the weld and base steel compositions and microstructures on coating formation, composition, microstructure, mechanical properties, and corrosion resistance were investigated. Salt spray tests show that the differences in mechanical properties and compositions on the weld and base steel substrates do not significantly affect the function of the corrosion-protective coatings. However, when the coating thickness is high, the corrosion resistance decreases. In addition, a SiOCN coating has been developed based on polysilazane and polysiloxane preceramic polymers. The SiOCN amorphous coating shows improved hardness and reduced modulus than the SiON layer only. The coating can also be repaired after damage. Our coating systems provide a new approach to extending the lifetime of nuclear waste containers in corrosive conditions. |