Influence of Rust Permeability on Corrosion of E690 Steel in Industrial and Non-industrial Marine Splash Zones
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The corrosion behaviour of E690 steel in industrial and non-industrial marine splash environments was studied by environmental testing, morphology analysis, electrochemical measurements, and scanning Kelvin probe microscopy. Chloride and sulphide anions were found to diffuse across the rust layer following the evaporation of seawater splashed on the steel’s surface. The cation-selective permeability of the rust layer resulted in an anion concentration gradient across the rust layer, which was more significant in the presence of sulphur dioxide. In addition, sulphur dioxide enhanced the formation of α-FeOOH, which led to the formation of distinct anode and cathode areas at the rust/steel interface.
Keywordselectrochemistry industrial environment low alloy steel marine splash zone rust layer analysis
This work was supported by the National Basic Research Program of China (973 Program) (Grant No. 2014CB643300], the National Key Research and Development Program of China (Grant Nos. 2016YFB0300604, 2016YFB0700502), the Fundamental Research Funds for the Central Universities (No. FRF-BR-17-028A).
Conflict of Interest
All the authors declare that they have no conflict of interest.
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