【摘 要】
：
Due to the wet-dry cycling in the ocean tidal zone,the supply of dissolved oxygen and salt-containing particles were sufficient,so the corrosion was serious.Pitting corrosion was a common form of localized corrosion.This paper studied the pitting corrosio
【机 构】
：
The Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,College of Chemis
【出 处】
：
中国海洋大学学报（自然科学英文版）
论文部分内容阅读
Due to the wet-dry cycling in the ocean tidal zone,the supply of dissolved oxygen and salt-containing particles were sufficient,so the corrosion was serious.Pitting corrosion was a common form of localized corrosion.This paper studied the pitting corrosion mechanism of dispersion-strengthened high-strength steel under different wet-dry ratio environments.Electrochemical Impedance Spectroscopy was used to study the changes of corrosion rate and electric double layer structure of the dispersion-strengthened high-strength steel.Scanning electron microscope,Raman spectroscopy,electron probe microanalysis and laser confo-cal scanning microscope were used to observe the corrosion product morphologies,analyze the corrosion product compositions,ana-lyze the secondary distribution of alloy elements in the corrosion products and analyze the pitting information of the steel after the corrosion products were removed.The results showed that the degree of the steel corrosion was slight when the wetting time was longer,the size and depth of the corrosion pits on the surface were smaller.This was because the environment with longer wetting time made the corrosion products denser.In this environment,the conversion of γ-FeOOH to Fe3O4 was promoted.In addition,it could also promote the alloying elements to be more concentrated in the rust layer.The above phenomena hindered the further corro-sion of the matrix by dissolved oxygen and C1-in the seawater.
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