Initial Corrosion Behavior of EH36 Marine Steel in Simulated Polar Marine Environment
Chenghuan Li, Can Peng, Xiaohan Li, Yuwei Liu, Yang Liu, Zhenyao Wang, Junjun Pai, Chuan Wang
Abstract
The corrosion behavior of grade EH36 steel in a simulated polar marine atmospheric environment (3.5%NaCl) for 10 d was studied using corrosion weight loss, surface morphology analysis, composition analysis, and electrochemical testing techniques. The results demonstrate that the corrosion rate of EH36 steel at low temperatures was high and it was still in the accelerated corrosion stage. After 240 h of corrosion, the corrosion rate was 0.47 g·m -2 h -1 . The corrosion products were mainly composed of β- FeOOH, Fe 3 O 4 , and small amounts of γ-FeOOH and α-FeOOH. The corrosion pit depth increased from 8.81 μm in 48 h of corrosion to 31.70 μm in 240 h. The study of the early corrosion behavior and mechanism of EH36 ship plate steel in polar marine atmospheric environment can provide an important reference for the composition design of ship plate steel and its application in marine environments.