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Fatigue failure of turbine blades originating from pitting corrosion is a critical issue for power plant. Herein, we study the pitting corrosion resistance of cast CA6NM as turbine blade material in simulated geothermal environment with and without CO2 gas by using cyclic polarization measurement. Three different molybdenum and nitrogen content of CA6NM were used for experiments: (i) CA6NM with a molybdenum content of 1 wt.% and without addition of nitrogen, (ii) CA6NM with a molybdenum content of 2 wt.% and without addition of nitrogen, (iii) CA6NM with a molybdenum content of 2 wt.% and nitrogen content 0.1 wt.%. The measurement reveals CA6NM with molybdenum 2 wt.% and nitrogen 0.1 wt.% is the most resistance to pitting corrosion in simulated artificial geothermal brine with and without CO2 gas.

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ABSTRAK PENGARUH SUHU DAN WAKTU PEMANASAN TERHADAP KARAKTERISTIK LAPISAN ELEKTROLES Ni-P PADA BAJA TAHAN KARAT MARTENSITIK SS 420. Telah dilakukan pelapisanelektroles Nikel-Posfor (Ni-P) pada baja tahan karat martensitik SS 420 dengan berbagai variasi suhu dan waktu perlakuan panas. Karakteristik lapisan elektroles Ni-P yang berupa strukturmikro dan ketahanan korosi dianalisis untuk mengetahui pengaruh variasi suhu dan waktu pemanasan. ABSTRACTEFFECT OF TEMPERATURE AND HEATINGTIME ON THE COATING CHARACTERISTICS OF MARTENSITIC SS 420 ELECTROLESS Ni-P. Electroless nickel phosphorus (Ni-P) coating has been done on the martensitic stainless steel SS 420 with a variety of temperature and heating time. Electroless Ni-P coating characteristics; microstructure and corrosion resistance were analyzed to determine the effect of variations in temperature and heating time. Variations in the temperature of the heat treatment used are 200