جستجوی مقالات مرتبط با کلیدواژه "حمام آب نمک" در نشریات گروه "مواد و متالورژی"

In this study, effects of using quenching in aqueous salt solution, on the corrosion behavior of Hadfield Manganese Steel was investigated. For making manganese steel according to ASTM A-128C standard, initially two Y-shaped aluminum models prepared and then castings made through Sodium Silicate/CO2 procedure by closed feeding method. Melting was conducted in non-core induction furnace. After the casting, both samples austenitized in 1100°C for 2 hours and then one block quenched in pure water and the other quenched in the aqueous 3.5% salt solution. To evaluate the corrosion behavior of samples, potentiodynamic polarization and electrochemical impedance spectroscopy methods in the 3.5% NaCl solution were used. The results of both methods indicates corrosion resistance of salt bath quenched sample is significantly higher than the other. This is due to:
a)-salt solution quenching medium decreased the amount of carbides in the microstructure and prevented the formation of galvanic cell.
b)- Quenching in salt solution increased the solubility of carbon in the austenite phase that caused the reducing the amount of grain boundaries.