TY - JOUR
T1 - Effect of Silicon on Corrosion Behaviour of Al-Zn As A Low Voltage Sacrificial Anode for Marine Environment
AU - Pratesa, Yudha
AU - Utama, Ahmad A.
AU - Erianto, Ardi
AU - Ferdian, Deni
N1 - Funding Information:
The authors are grateful to PT INALUM Indonesia for providing DRPM-UI through PITTA grant 2017 for the financial support.
Publisher Copyright:
© 2019 Published under licence by IOP Publishing Ltd.
PY - 2019/9/5
Y1 - 2019/9/5
N2 - 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.
AB - 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.
KW - Aluminum
KW - Low Voltage
KW - Marine Corrosion
KW - Sacrificial Anode
KW - Ship Maintenance
UR - http://www.scopus.com/inward/record.url?scp=85072631338&partnerID=8YFLogxK
U2 - 10.1088/1757-899X/547/1/012056
DO - 10.1088/1757-899X/547/1/012056
M3 - Conference article
AN - SCOPUS:85072631338
VL - 547
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
SN - 1757-8981
IS - 1
M1 - 012056
T2 - 1st International Conference on Design and Application of Engineering Materials 2018, IC-DAEM 2018 in conjunction with 11th Seminar Nasional Metalurgi dan Material, SENAMM 2018
Y2 - 6 September 2018 through 7 September 2018
ER -
