Effects of Aging Treatment on Inconel Specimen 600, 625, 718 Coated With Nickel Chromium Carbide (Cr3C2-Nicr) Using Salt and Acidic Corrosion Methods

Abstract

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 carbide & average thicknesses of 61.34μm, 67.97μm and 60.84μm are obtained.
The nickel chromium carbide 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 (15x20x6) 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.