Cr diffusion coatings on a ferritic-martensitic steel for corrosion protection in KCl-rich biomass co-firing environments

T.M. Meißner, X. Montero, D. Fähsing, M.C. Galetz

Corrosion Science (2019), DOI: 10.1016/j.corsci.2019.108343

Three diffusion coatings (Cr, Ni + Cr, Ni-P + Cr) on a ferritic-martensitic X20CrMoV12-1 steel were investigated in a biomass-co-firing atmosphere in comparison to uncoated austenitic DMV 310 N. Exposures were conducted at 650 °C for up to 300 h with pure sulphates as well as a mixture of sulphates and KCl. These aggressive testing conditions were chosen to accelerate degradation of the specimens allowing for an efficient ranking between them. Beneath the deposit of Na2SO4-K2SO4 the coatings proved to be highly resistant whereas addition of KCl drastically accelerated the corrosive attack. This is discussed within the frame of different synergistic high temperature corrosion mechanisms.

Link zur Publikation

zurück
Jetzt Stifter werden