IMPROVEMENT OF CORROSION BY MOLTEN SALTS IN COATING POWDERS MIXED IN DIFFERENT COMPOSITIONS OF YSZ–Al2O3

The improvement of corrosion performance at high temperatures of coatings in which the alumina composition in Yttria-stabilized zirconia (YSZ-Al 2 O 3 ) was varied in 3 different percentages was studied.These systems were deposited on AISI 304L stainless steel substrates using plasma spraying.The determination of the corrosion rate was performed in a corrosive environment containing 20 % Na 2 SO 4 and 80 % V 2 O 5 , at temperatures ranging from 800 °C to 900 °C.The structural characterization was determined by X-ray diffraction (XRD), and the analysis of the surface after exposure at 900°C was performed by scanning electron microscopy (SEM).The best performing system was the one containing 40% alumina, due to the morphology and structural change.