σ Phase on Selective Corrosion of 2205 Duplex Stainless Steel Corrosion Science and Protetion Technology. 2017, 29 (
The microstructure,corrosion resistance properties and corrosion morphology of the 2205 duplex stainless steel aged at 850 ℃ for different time were characterized by means of optical microscope and scanning electron microscope, as well as potentiodynamic polarization measurement and electrochemical impedance spectroscopy. The result showed that: the trace amount of σ phase-precipitates is not obvious harmful to the corrosion resistance of the steel; however, with the increasing
σ phase precipitation, it is difficult to form stable passivation film on the steel surface, thus its corrosion resistance decreases obviously; the corrosion pits firstly appeared at the interface of σ phase and matrix, and then expanded to ferrite phase. Besides that, σ phase could also change the electrochemical corrosion morphology characteristics, i. e. the morphology of pits changed from hemispherical pit to seriously destroyed pit with small mouth but large cavity, then transformed into wide- and shallow-bowl like pit.
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Rsearch Progress on Application of Graphene for Anti-Corrosion Coatings
Corrosion Science and Protetion Technology. 2017, 29 (
Graphene modified coatings possess advantages such as long-term high temperature resistance, good weather ability as well as good resistance tosalt-spray fog aging, acid, alkali and light agingetc. Graphene can be used to improve the impact resistance, friction resistance, thermal conductivity,weathering resistance and corrosion resistance of coatings used in a variety of extreme environments. In this paper, the properties of graphene, the preparation methods of graphene coatings, the mechanism of anticorrosion and the application of graphene anticorrosion coatings are reviewed.
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