Open AccessPitting Corrosion Resistance of CA6NM and 410 Martensitic Stainless Steels in Various Environments
Author(s) -
Efendi Mabruri,
H. M. Sigit,
Moch. Syaiful Anwar,
Mukhlis Agung Prasetyo,
Arini Nikitasari,
A. De Fretes
Publication year - 2020
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/858/1/012049
Subject(s) - materials science , metallurgy , pitting corrosion , martensitic stainless steel , microstructure , corrosion , alloy , martensite , optical microscope , polarization (electrochemistry) , scanning electron microscope , composite material , chemistry
Pitting corrosion is an importance phenomena in power generation steam turbine, as it is one of the main causes for blade failure, particularly in the last row of low pressure blading. In this work, the pitting corrosion resistance of the widely used blading alloy of wrought 410 stainless steel and that of the candidate alloy of cast CA6NM stainless steel were investigated. Cyclic polarization measurements for all samples were conducted in simulated solution of thermal and geothermal power plants. The experimental results show that the pitting potentials of the cast CA6NM steel were higher compared to those of the wrought 410 steel in all simulated solution. Both steels exhibited higher pitting potentials in CO2 containing simulated geothermal water than those in the other solutions. These results were correlated with microstructure of the steels observed by Scanning Eectron Microscope (SEM).