Abstract:In this work, the corrosion behavior of the AA4006 alloy made by the twin roll caster process was evaluated using electrochemical impedance spectroscopy (EIS), anodic potentiodynamic polarization curves, and scanning electron microscopy (SEM). This alloy belongs to the Al–Fe–Si system and is present with higher amounts of Fe and Si than AA1050 aluminum. Electrochemical tests were performed in a sulfate solution with or without chloride ions, and two different areas of the AA4006 alloy were tested: at the surfa… Show more
A sacrificial anode is a method for material protection in the sea and coastal area. This method is widely applied in marine, subsea and ship structure. Al-Zn-In, a commercial grade of the sacrificial anode had a weakness in the possibility of stress corrosion cracking due to overprotection. This study tried to substitute indium with silicon as the alloying element with composition 0.5% and 1% wt. However, commercial grade Al ingot contained trace elements such as iron in the significant amount, which could make a β-Al9Fe2Si2 as an iron-rich intermetallic phase. Therefore, this study will also examine the effect of β-Al9Fe2Si2 on alloys corrosion behavior. The alloy was produced through casting process with resistance furnace. Corrosion behavior was characterized by cyclic polarization in 3.5% NaCl solution. Microstructure characterization was performed using Scanning Electron Microscope, Energy Dispersive Spectroscopy, and optical metallography. The result showed that the silicon increases the corrosion rate of Aluminum Zinc (Al-Zn) and reduced the potential protection of the alloy in high strength steel. Our research showed the corrosion took place along the interdendritic area where the β-Al9Fe2Si2 intermetallic phase formed in a micro galvanic manner
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.