In order to accurately understand the corrosion laws of tower tube materials in acidic atmosphere environment, and provide a theoretical basis for the anticorrosion optimization of offshore wind turbine tower tube structure, the dry and wet acid salt spray test was used to simulate the coastal atmospheric environment to corrode Q345D alloy steel for 24, 48, 72, 96, 168,240, 360， 480 h to study the corrosion laws of the tower tube material Q345D steel in this environment. The sample Q345D after each corrosion period was analyzed by X - ray diffractometer analysis (XRD), scanning electron microscope (SEM) observation, corrosion weight loss rate, electrochemical measurement and other methods. Results showed that the corrosion kinetics curve of Q345D followed the law of power function. With the increase of corrosion time, the corrosion rate of Q345D steel presented a trend of increasing change. The corrosion rate was fast within 168 h, and then slowed down from 168 h to 240 h, and slowly increased again after 320 h. Under the environment of coastal atmosphere, the corrosion products of Q345D mainly included β - FeOOH, Fe2O3, γ - FeOOH, Fe3O4 and ɑ - FeOOH. During the corrosion process, the formation of a small amount of ɑ - FeOOH slowed down the corrosion rate of the substrate. The self corrosion potential of rusty Q345D steel showed a trend of gradual increase with the extension of corrosion time. Within 168 h, the self corrosion current density was increased and the corrosion rate was increased; from 168 h to 240 h the self corrosion current density was decreased, the rust layer protection became better gradually, and the corrosion rate was reduced in this stage; and from 240 h to 480 h the corrosion current density was increased and the corrosion rate was accelerated again.
XU Jing - ming, HU Jie - zhen, DENG Pei - chang, WU Jing - quan, WANG Gui
. Study on Corrosion Laws of Wind Power Tower Tube Material Q345D Alloy Steel Under Simulated Oceanic Atmospheric Environment[J]. Materials Protection, 2021
, 54(3)
: 64
-69
.
DOI: 10.16577/j.cnki.42-1215/tb.2021.03.011
