Effect of Cathodic Protection for Ballast Tanks

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  • バラストタンク各種陰極防食法の効果
  • バラストタンク カクシュ インキョク ボウショクホウ ノ コウカ

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This paper is the intermediate report of cathodic protection for ballast tanks of several tankers. Various methods (i. e.: various kinds and types of anode at various current densities) have been applied for several tanks. Tank potential has been measured by tanker crews. The investigation is not completed yet, but some valuable results were obtained. They are as follow:<br>1) Preliminary electrocoating method was not satisfactory. Coated film was not rigid enough, and disappeared within 6 months.<br>2) Zinc anode only may be able to use as sacrificial anode for protection of crude oil tank, but magnesium anode is more suitable than zinc anode.<br>3) Performance of combined use of zinc and magnesium anode is quite excellent.<br>4) Relation between potential, current density and time is obtained.<br>5) Polarization of wing tank is a little larger than that of center tank.<br>6) Ballast period is the controlling factor on the current density to be selected, and suitable current density for Japanese tankers which are usually engaging on the Middle East voyage is 120mA/m2.

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