Hot corrosion is a type of accelerated metal wastage frequently found in industrial applications especially waste incinerators and fossil-fuel burning boilers. To study the corrosion behavior in real practice, the laboratory tests have been performed. The effect of the temperature, amount of the mixed salt, potentials of oxygen, sulfur oxides(SO₂ and SO₃, HCl, and water vapor have been studied by Thermogravimetric analysis(TGA) method in the temperature range of 530 and 650℃. The reaction kinetics follow the parabolic rate law for both O₂-SO₂-SO₃ and O₂_SO₂-SO₃-HCl-H₂O environments, while it obeys the linear rate law in O₂-SO₂-SO₃ HCl mixture. Corrosion products were characterized by X-ray diffraction, Scanning electron microscopy and Energy dispersive X-ray analysis. Sulfate induced accelerated attack of low carbon steel in chlorine contaminated environment, occurs by (i) acidic fluxing-the sulfation of the iron oxides to form Fe₂(SO₄)₃, and (ii) vapor phase transfer-vaporization of iron chlorides, FeC1₂ and FeC1₃, through the oxide scale if P_(c12) is high enough to form metal chlorides. Chlorine reacts with salt deposit and iron oxide to produce alkali chlorides and forms a complex Na₂SO₄-K₂SO₄-Na₃Fe(SO₄)₃-K₃Fe(SO₄)₃-NaCl-KCI-FeCl₂ salt. When the water vapor is added to the dry gas mixture containing HCl, chlorine potential, P_(c12), decreases significantly. Below the equilibrium chlorine potential to form condensed iron chlorides, no vapor phase transfer occurs.