Open AccessPitting corrosion resistance of CA6NM as geothermal turbine blade material in simulated artificial geothermal brine
Author(s) -
Arini Nikitasari,
Mukhlis Agung Prasetyo,
Rini Riastuti,
Efendi Mabruri
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/541/1/012016
Subject(s) - molybdenum , corrosion , brine , metallurgy , geothermal gradient , pitting corrosion , materials science , nitrogen , turbine blade , turbine , chemistry , geology , engineering , mechanical engineering , organic chemistry , geophysics
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 CO 2 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 CO 2 gas.