Cyclic Oxidation and Hot Corrosion Behaviour of Plasma Gun Sprayed Cermet Coatings on SS-304 Steel

Authors

  • Satjot Singh Dhillon, Vikas Chawla, Gurbhinder Singh

Abstract

Power generation equipments, gas turbines and chemical plants face a serious problem of hot corrosion, due to which of the metallic components occurs. In the present study, S-304 boiler steel, that was being used in thermal power plant, has been investigated for its high temperature oxidation and hot corrosion behavior. Al2O3+13%TiO2 , Al2O3+3%TiO2 and Al2O3 powder was sprayed on the boiler steel using detonation gun thermal spraying process. The uncoated as well as coated S-304 samples were taken for being subjected to cyclic high temperature oxidation in air at 900°C and hot corrosion in molten salt environment of Na2SO4–60% V2O5, at 900°C, for 50 cycles. On performing high temperature oxidation study in air at 900°C, the maximum oxidation resistance was shown by Al2O3+13%TiO2 with weight gain of 1.86% followed by Al2O3+3%TiO2 with weight gain 2.36%. The weight gain for Al2O3 was 2.92%. The minimum resistance was shown by uncoated S-304 with weight gain of 3.91%.As a result of the study of hot corrosion in molten salt environment of Na2SO4–60%V2O5 at 900°C, the weight gain percentages of Al2O3+13%TiO2 coated, Al2O3+3%TiO2 coated, Al2O3 coated and uncoated are 2.46%, 2.92%, 3.77% and 4.67% respectively. The protection obtained against hot corrosion followed the following sequence: Al2O3+13%TiO2 coated > Al2O3+3%TiO2 coated > Al2O3 coated > uncoated S-304 boiler steel.

Published

2020-12-17

Issue

Section

Articles