Corrosion Behavior of High Pressure Die Cast Al-Ni and Al-Ni-Ca Alloys in 3.5% NaCl Solution
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In this investigation corrosion behavior of newly developed high-pressure die cast Al-Ni (N15) andAl-Ni-Ca (NX1503) alloys was studied in 3.5% NaCl solution. The electrochemical corrosion behaviorwas evaluated using open circuit potential (OCP) measurement, potentiodynamic polarization, andelectrochemical impedance spectroscopy (EIS) techniques. Potentiodynamic polarization results validatedthat NX1503 alloy exhibited lower corrosion current density (icorr) value (5.969 μA/cm2) comparedto N15 (7.387 μA/cm2). EIS-Bode plots revealed a higher impedance (|Z|) value and maximum phaseangle value for NX1503 than N15 alloy. Equivalent circuit curve fitting analysis revealed that surfacelayer (R1) and charge transfer resistance (Rct) values of NX1503 alloy was higher compared to N15alloy. Immersion corrosion studies were also conducted for alloys using fishing line specimen arrangementto simultaneously measure corrosion rates from weight loss (PW) and hydrogen volume (PH) after 72hours and NX1503 alloy had lower corrosion rate compared to N15 alloy. The addition of Ca toN15 alloy significantly reduced the Al3Ni intermetallic phase and further grain refinement may beattributed for reduction in the corrosion rate.
Abstract
In this investigation corrosion behavior of newly developed high-pressure die cast Al-Ni (N15) andAl-Ni-Ca (NX1503) alloys was studied in 3.5% NaCl solution. The electrochemical corrosion behaviorwas evaluated using open circuit potential (OCP) measurement, potentiodynamic polarization, andelectrochemical impedance spectroscopy (EIS) techniques. Potentiodynamic polarization results validatedthat NX1503 alloy exhibited lower corrosion current density (icorr) value (5.969 μA/cm2) comparedto N15 (7.387 μA/cm2). EIS-Bode plots revealed a higher impedance (|Z|) value and maximum phaseangle value for NX1503 than N15 alloy. Equivalent circuit curve fitting analysis revealed that surfacelayer (R1) and charge transfer resistance (Rct) values of NX1503 alloy was higher compared to N15alloy. Immersion corrosion studies were also conducted for alloys using fishing line specimen arrangementto simultaneously measure corrosion rates from weight loss (PW) and hydrogen volume (PH) after 72hours and NX1503 alloy had lower corrosion rate compared to N15 alloy. The addition of Ca toN15 alloy significantly reduced the Al3Ni intermetallic phase and further grain refinement may beattributed for reduction in the corrosion rate.
참고문헌 (25)
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