水道水中における鋼,亜鉛の腐食に及ぼす流速の影響と膜脱気による腐食防止効果 : 鋼と亜鉛の腐食挙動および砲金/亜鉛めっき鋼管の異種金属接触腐食の検討

概要

論文の詳細を見る
The comparison experiment of the tap water and the vacuum membrane deaeration water on the influence of flow velocity for the corrosion of steel and zinc and the galvanic corrosion of gunmetal/galvanized steel pipe was done. It experimented with the piping device and the test pieces. The main results of this thesis are shown as followings. 1) The corrosion rate of the steel that passes the tap water decreases with an increase at flow velocity in the range of 0.62-1.5m/s. It is because the surface of the steel is made a passivity. Corrosion is made a localization with an increase at flow velocity and the local corrosion is promoted. 2) The effect on zinc is small though the corrosion controlling effect of steel by the vacuum membrane deaeration is large. 3) A galvanic current of gun metal/galvanized steel pipe decreases by the vacuum membrane deaeration, and the galvanic corrosion of the gun metal/the galvanized steel pipe is reduced.
2006-10-30