STUDY OF ELECTROCHEMICAL PROPERTIES AND CHARACTERIZATION OF SUBSTRAT UNS C70600 COATED WITH MnO2 FOR IMPRESSED CURRENT CATHODIC PROTECTION ANODE

• Main Author: Natanael Gonggom P, Legino
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/40815
• Institution: Institut Teknologi Bandung

Anode have become one of important aspects in Impressed Current Cathodic Protection (ICCP). ICCP anode should give adequate current density for protection to protected structure. This study will focus on forming an electrocatalyst oxide layer MnO2 on the surface of CuNi alloy. Anode is expected to produce a large current density for protection and a low rate of degradation as the ICCP anode condition. The main research is to form MnO2 layer by heating process after electroplating Mn. The study used several methods of characterization.OES method to determine the element composition of copper nickel alloy, SEM method to determine the surface’s morphology of MnO2 oxide layer result from electroplating and heating process. XRD method to check whether MnO2 oxide form at CuNi alloy’s surface by heating process. Electrochemical properties are obtained by polarization potensiodynamic before and after electroplating process on H2SO4, NaCl and sea water environtment. From metallography and OES method, turn out that CuNi alloy spesimen is UNS C70600 alloy. From polarization test before electroplating result that UNS C70600 alloy have a corrosion resistance and corrosion current drain ability near to Titanium. Electroplating method showed the best current density to use for Mn coating is below 5 A/dm2. Heating process is carried out to form MnO2. XRD method showed that MnO2 formed at heating temperatur 400°C for about 22 minutes. Polarization test after electroplating and heating process showed that CuNi alloy-MnO2 has better corrosion resistance compared to MMO anodes. In kinetics of corrosion, CuNi alloy-MnO2 showed electrochemical activity at low potential around 0-0,3 V. This means that MnO2 anode can be used as ICCP anode at low potential range.