Protection of Steel Using Aluminum Sacrificial Anodes in Artificial Seawater

Authors

Tai-Ming Tsai, Lecturer, Department of Marine Engineering and Technology, National Taiwan Ocean University, Keelung, Taiwan 20224, R.O.C.

Abstract

The performance of aluminum alloys used as sacrificial anodes for cathodic protection in seawater was investigated in this study, Results show that A1 -3.5%Zn -0.05%In sacrificial anode alloy C has the best current efficiency, most negative open circuit potential and energy characteristics among five different Al-Zn-In alloys. Polarization curve of alloy C also shows no passivation behavior in artificial seawater. The corrosion rate of mild steel in artificial seawater was determined as a function of applied cathodic potential. The cathodic protection potential determined for mild steel in seawater was -0.78 V,SCE for a corrosion rate of less than 1 mpy. The protective area ratio of steel to sacrificial anode has been measured. Steel can be protected under the area ratio up to 4000-5000.

Recommended Citation

Tsai, Tai-Ming (1996) "Protection of Steel Using Aluminum Sacrificial Anodes in Artificial Seawater," Journal of Marine Science and Technology: Vol. 4: Iss. 1, Article 12.
DOI: 10.51400/2709-6998.2545
Available at: https://jmstt.ntou.edu.tw/journal/vol4/iss1/12