Study on the Corrosion Charactristics and its Corrosion Protection of Steel Fishing Banks

강제어촌의 부식특성과 그 방식에 관한 연구

  • Lim, Uh-Joh (Dept. of Mechanical Eng.,National Fisheries University of Pusan) ;
  • Lee, Jong-Rark (Dept. of Mechanical Eng.,National Fisheries University of Pusan)
  • Published : 1992.06.01


The corrosion rate, behavior of corrosion fatigue and characteristic of cathodic protection for SB41 were investigated by corrosion and corrosion control tests in seawater at laboratory and coast. The main result obtained are as the following; 1) The corrosion rate of base metal (BM) is about 28-37 mg/dm super(2) day in seawater of coast. 2) The correlation between the stress intensity factor range $\Delta$K and crack propagation rate da/dN for weldment follows paris' rule in seawater : da/dN=C($\Delta$K) super(m) where m is the slope of the correlation, and is 2.02 for BM and 1.75 for heat affected zone (HAZ) respectively. 3) The corrosion sensitivity of HAZ is more sensitive than that of BM under the low region of $\Delta$K. 4) With increase of bared surace area of cathode, cathodic protection potential is increased sharply.