鉄製推進器の電氣的防蝕法

概要

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For the purpose of preventing corrosion of screw propeller made of cast steel or cast iron, we propose the following method ; the cathode of any D. C. source prepared in the ship is connected to a propulsion shaft bearing, and its anode to a mild steel plate attached outside the hull, so as to produce electric current through the sea water from the anode plate to the screw propeller. We cleared the theory of this method by means of fundamental experiments about electrolytic corrosion of mild steel, and established a designing course for the practical application. At the practicalizing tests of this method by 2 ton wooden built motor-boat for about one year, and by 430 ton steel vessel for about six months, satisfactory results were obtained in either case even with rather weak current, that is, 0.14 A for the former and 5 A for the latter.
社団法人日本船舶海洋工学会の論文
1954-09-00