Abstract
The effect of Cu addition on the electrochemical corrosion behavior of Ni3Al intermetallic alloy was investigated by potentiodynamic polarization, open-circuit potential, linear polarization resistance, and electrochemical impedance spectroscopy in 1.0 M H2SO4solution. Performance of the pure elements (Cu, Ni, and Al) was also evaluated. In general, Cu addition improved the corrosion resistance of Ni3Al. Electrochemical measurements show that corrosion resistance of Ni3Al-1Cu alloy is lower than that of other intermetallic alloys and pure elements (Ni, Cu, and Al) in 1.0 M H2SO4solution at 25°C. Surface analysis showed that the Ni3Al alloys are attacked mainly through the dendritic phases, and Cu addition suppresses the density of dendritic phases.
Highlights
Acid solutions are extensively utilized in the industry sector for several purposes, such as acid pickling, industrial acid cleaning, acid descaling, and oil well acidizing [1]
Effect of Cu addition on the corrosion behavior of Ni3Al and pure elements (Cu, Ni, and Al) in 1.0 M H2SO4 solution was studied by electrochemical measurements
Results indicate the following: polarization curves for intermetallic alloys (Ni3Al, Ni3Al-xCu) showed an active-passive behavior with a wide passivation zone, open-circuit potential (OCP) measurements indicate that the Cu addition influences the kinetics of the anodic reaction by icorr
Summary
Acid solutions are extensively utilized in the industry sector for several purposes, such as acid pickling, industrial acid cleaning, acid descaling, and oil well acidizing [1]. The corrosion behavior of carbon steel in acidic solution is significant considering its widespread applications, namely, in the manufactures of pipe lines for petroleum industries. Acid solutions are frequently used in the removal of rust and scale-developed in industrial process. Since the steel is the major structural material utilized in the construction industry, there have been considerable efforts focused on the prevention of steel corrosion. As most steels are stable in neutral or alkaline media, acidic environments are the major concern. A group of materials that could serve as substitutes of steel are the intermetallics compounds when exposed to acidic solutions because these compounds possess good corrosion and oxidation resistance in media, containing oxygen and sulphur, good abrasion resistance, and small density. In order to transport and store acids solutions like H2SO4, it is important to select properly the materials suited for these processes [7]
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