EFFECTS OF AGING TREATMENT ON INCONEL SPECIMEN 600, 625, 718 COATED WITH NICKEL CHROMIUM CARBIDE (CR3C2-NICR) USING SALT AND ACIDIC CORROSION METHOD
When the material interacts with its surroundings, the deterioration of the material's important properties is referred to as corrosion. Substances used as construction material processing equipment, including the product from it, called materials. These materials can be metals and their alloys, composites, polymers, ceramics, etc., Corrosion is commonly known as rust. Generally, Iron and its alloys are the most commonly used materials opted to design different structural component, and thus are largely affected by corrosion in this aspect understanding of corrosion study plays a very vital role. Our work includes the use of the thermal spray by D-gun method on three different Inconel materials 600, 625 and 718 are coated with nickel chromium & average thicknesses of 61.34µm, 67.97µm and 60.84µm obtained. The nickel chromium coated materials then undergo acid corrosion and salt corrosion tests. In Acid Corrosion test, The Inconel coated substrates were subjected to laboratory corrosion tests utilizing glass flask and chemicals of the reagent grade. The specimen has a dimension of (15*20*6) mm. The three Inconel specimens 600, 625, 718 are soaked in three different beakers containing a capacity of 60ml HCl concentrated for 72 hours. For three different Inconel specimens 600, 625, 718 using Salt spray test rig Salt corrosion test is conducted with temperature range 35°C to 65°C and corrosion rate is calculated. Finally, after the acid corrosion test on three Inconel 625 shows a weight reduction of 0.28% and in salt Inconel 625 shows the average corrosion rate of 38.5Mpy. Hence it is concluded that Inconel 625 material has maximum coating thickness as compare to Inconel 600 & 718 coated material therefore Inconel 625 exhibited a promising physical and structural properties & also studied the surface morphology of coated Inconel substrates by Atomic force microscopy (AFM) from this it should be noted that in some areas of materials, there were indications of the existence of local crystalline structures. Cracking is clearly evident at the surface.
Salt spray corrosion, Inconel specimen 600,625 and 718, NaCl, HCl, Surface roughness.