FRP船のCu-Al合金製プロペラの腐食と防食について
FRP船推進装置の防食に関する研究 (第2報)
1976 年 25 巻 4 号 p. 219-222
詳細
1976 年 25 巻 4 号 p. 219-222
In the first report it was shown that damage of metallic propulsive device (Cu-Al alloy propeller) on FRP ships was caused by electrochemical corrosion and could be prevented by supplying sufficient, cathodic protective current. The purpose of this research are to find the stray current that might cause corrosion of the propeller and to determine the protective current density to Cu-Al alloy. Measurements were carried out on the stray current to Cu-Al alloy and on the dissolution rate of zinc anodes for cathodic protection of propellers while running and while stopping. The following conclusions were obtained: (1) The stray current was not directly related to the corrosion of the propeller. (2) The dissolution rate of zinc anodes for cathodic protection of propeller was closely related to the corrosion of the propeller. (3) The protective current density required for protection of Cu-Al alloy was 425mA/m2.
