Dresden 2017 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 6: Structural Materials
MM 6.3: Talk
Monday, March 20, 2017, 10:45–11:00, IFW D
Microstructural investigation on the Na2SO4 - NH4Cl salt spray tested Alloy 602CA sheets subjected to different surface modification techniques — •Sai Rajeshwari K1, Gerhard Wilde2, Vijay K. Vasudevan3, and Sankaran S1 — 1Department of Metallurgical and Materials Engineering, IIT Madras, Chennai, India — 2Institute of Materials Physics, University of Münster, Germany — 3Department of Chemical and Materials Science Engineering, University of Cincinnati, USA
Alloy 602CA is a high temperature corrosion resistant nickel base super alloy with high creep strength in carburizing and oxidizing atmosphere. Alloy 602CA contains 5% (by volume) of Cr23C6 precipitates which act as reservoirs for the formation of a protective Cr2O3 coating in the event of high temperature exposure to oxidation or corrosion. Hence, it is extensively used in thermal, petrochemical and power plant equipment. Corrosion due to Na2SO4 salt deposition is a major challenge and involves high cost.An attempt is made to improve the high temperature corrosion resistance and fatigue properties of the Alloy 602CA sheets through two surface modification techniques namely, High Reduction Cold Rolling (HRCR) and Ultrasonic Nanocrystal Surface Modification (UNSM).Microstructural and corrosion behavior investigations employing Scanning Electron Microscopy and Energy Dispersive Spectroscopy of HRCR and UNSM treated alloy 602CA sheet samples subjected to Na2SO4 :NH4Cl (80:20)salt spray tests for varying duration of 20, 40 and 60 hours at 925°C will be discussed in detail.