Preparation and hot corrosion behaviour of an Al-gradient NiCoCrAlYSiB coating on a Ni-base superalloy

Combating Corrosion Degradation of Turbine Materials Using HVOF Sprayed 25% (Cr3C2-25(Ni20Cr)) + NiCrAlY Coating

“…The morphology looks similar in all three cases. Similar morphological features are also reported during hot corrosion of MCrAlYSiB (M=Ni or Co) coated superalloys [35,36]. Though the coatings look like broken scales (plate like morphology), there was no spalling of the scales.…”

Hot-Corrosion Behavior of Thermal Barrier Coated Dz125 Superalloy Exposed to Atomized Seawater and Kerosene

“…This indicates that the coated specimens exhibited significant improvement as compared to the bare specimen. The DZ125 superalloy is poor in the corrosion performance, which has been also reported by Wang et al 11,12 The interesting phenomenon for the bare specimen is that the mass change in the first 50 h is lower than 1 mg/cm 2 , very similar to those of the coated specimen, despite a disastrous spallation after 50 h. As the hot corrosion of the superalloy is an electrochemical process at 900°C, 7 the corrosion rate approaches to the maximum when the corrosive deposits survive in the molten state. Fig.…”

“…Also, the mixed salt could cause severe hot-corrosion than pure Na 2 SO 4. 11 The molten salts such as Na 2 SO 4 and NaCl, could dissolve the protective scales, resulting in internal oxidation in the bare and aluminized alloys. At high temperature the reaction of 2NaCl (l)+1/2O 2 (g)=Na 2 O (S)+Cl 2 (g) could occur and produce Cl 2 2, 18 .…”

Hot corrosion behavior of solution precursor and atmospheric plasma sprayed thermal barrier coatings

“…Hot corrosion of TBCs and superalloy base materials is a widely studied topic [16][17][18][19][20][21][22][23][24][25]. Hot corrosion in TBCs refers to the degradation by molten salt deposits (V 2 O 5 or NaVO 3 ) that react with yttria to form YVO 4 .…”