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Influence of Temperature on Corrosion of 316L Stainless Steel in Seawater

Keywords: stainless steel,pitting,critical pitting temperature,cyclic anodic polarization,desalination of seawater

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The corrosion behavior of 316L stainless steel in seawater was investigated by measurements of critical pitting temperature,cyclic anodic polarization and electrochemical impedance spectroscopy under different temperature.The results indicated that two 316L specimens with different grain size showed similar critical pitting temperature.The increase of seawater temperature led to the linear decrease of pitting potential and repassivation potential.The pitting resistance of the fine grain steel decreased larger than that of coarse grain steel with temperature increasing, the latter had a higher pitting potential about 60 mV at 85℃.Compared with the coarse grain steel,the surface of passive film formed on the fine grain steel showed more defects and thereby which showed a shorter incubation time of pitting corrosion at 65℃.


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