RETRACTED: Comparative study of hot corrosion behavior of thermal sprayed alumina and titanium oxide reinforced alumina coatings on boiler steel

Abstract

The current work evaluates the effect of hot corrosion on ASTM-SA213-T-22 Steel with a coating of 100Al 2 O 3 and 20TiO 2 -Al 2 O 3 at 900°C in the molten salt environment of (Na 2 SO 4 -60% V 2 O 5 ). The coatings were sprayed by plasma spray technique. The bare and coated samples were placed inside the muffle furnace at 900°C for 50 cycles. Each cycle consisted of heating for 1 h and 20 min of cooling at ambient temperature. The kinetics of hot corrosion was analyzed by measuring mass gain after each cycle. The results were achieved by using visual examination, mass change measurement, XRD and SEM/EDS analysis. The result revealed that bare steel was more affected with corrosion and gained more mass due to the development of iron oxide (Fe 2 O 3 ) than the coated sample. Fe 2 O 3 and Cr 2 O 3 were found as major phase in oxide scale of T-22 uncoated steel specimen. The 100Al 2 O 3 and 20TiO 2 -Al 2 O 3 coated specimen indicated the reduction in mass gain by 25.41% and 67.02% respectively as compared to uncoated specimen. Al 2 O 3 coating with the combination of TiO 2 showed better adhesion properties. The presence of TiO 2 enhanced the durability and strength of Al 2 O 3 coating to withstand high temperatures.

Microscopic Characteristics and Properties of Fe-Based Amorphous Alloy Compound Reinforced WC-Co-Based Coating via Plasma Spray Welding

“…The rapid development of the industry has led to increasingly higher requirements for the performance and service life of various mechanical parts [1][2][3]. Wear and corrosion are the prime reasons for material failure during use, which seriously affect the performance quality and service life of mechanical products [4][5][6][7].…”

Role of Artificial Intelligence in Distinct Sector: A Study

“…In addition, the major problems in thermal power plant are corrosion, oxidation and erosion. However, various authors [16][17][18][19][20][21][22][23][24][25][26][27][28][29] have used various types of coatings to combat high temperature oxidation, erosion corrosion. But, the use of AL in power plant can play a significant role.…”

Comparative investigation of surface modification and corrosion behaviour on SS304 and SS316 Coated with Inconel 625 in Air and Molten Salt Environment

“…Evaluation of hot corrosion on ASTM-SA213-T-22 Steel with coatings of 100Al 2 O 3 and 20TiO 2 -Al 2 O 3 by plasma spray at 900 °C was done in a molten salt environment of (Na 2 SO 4 -60% V 2 O 5 ). The results demonstrated that uncoated steel was severely corroded and gained more mass, 20TiO 2 -Al 2 O 3 coating provides temperature resistance with an increased lifetime [8]. Using high process temperatures and pyrolysis, an ash and sludge environment was induced for corrosion study on a (CMT)-clad Inconel 625. longterm corrosion experiments were conducted at 650 °C for 1000 h. The biomass ashes created deep corrosion layers (about 5-15 μm), whereas the sewage sludge ash caused shallow corrosion layers (approximately 1-5 μm) [9].…”