Effect Of Silicon On Corrosion Behaviour Of Al-Zn As A Low Voltage Sacrificial Anode For Marine Environment

International Conference on Design and Application of Engineering Materials in conjunction with Seminar Nasional Metalurgi dan Material XI (SENAMM)

材料科学;金属学

Pratesa, Yudha^1 ; Utama, Ahmad A.^1 ; Erianto, Ardi^1 ; Ferdian, Deni^1

Department of Metallurgy and Materials, Faculty of Engineering, Universitas Indonesia, 16424, Indonesia^1

关键词: 3.5% nacl solutions;    Interdendritic areas;    Low voltages;    Marine corrosion;    Microstructure characterization;    Optical metallography;    Sacrificial anodes;    Ship maintenance;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/547/1/012056/pdf
DOI  :  10.1088/1757-899X/547/1/012056

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

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.