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Corrosion Behavior of 316L Stainless Steels Exposed to salt lake atmosphere of Western China for 8 years

Acta Metallurgica Sinica(English Letters) 2021年第4期34卷 555-564页

作者： Mingxiao Guo Junrong Tang Tianzhen Gu Can Peng Qiaoxia Li Chen Pan Zhenyao Wang Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China University of Chinese Academy of Sciences Beijing100049China

The evolution of corrosion behavior of 316 L stainless steels exposed to salt lake atmosphere for 8 years was investigated.The results showed that the stainless steel in salt lake atmosphere had a greater corrosion rate during the initial exposure time and relatively lower corrosion rate during the subsequent exposure time.Dust depositions accumulated on the downward surface caused severe local corrosion of stainless steel.As exposure time prolonged,the relative amount of Croxide and Feoxidein the corrosion products gradually increased,which may directly affect the corrosion rate of stainless steels.Moreover,the maximum pit depth followed a power function with respect to exposure time.

关键词： Atmospheric corrosion salt lake atmosphere Stainless steel X-ray photoelectron spectroscopy(XPS) Electrochemical impedance spectroscopy(EIS)

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Corrosion Behavior of 304 Stainless Steel Exposed to a Simulated salt lake atmosphere

引用

Acta Metallurgica Sinica(English Letters) 2020年第6期33卷 857-870页

作者： Mingxiao Guo Qi Yin Miaoran Liu Chen Pan Zhenyao Wang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China

The corrosion behavior of stainless steel exposed to a simulated salt lake atmosphere has been investigated by analyzing the evolution of surface morphologies and corrosion products, the initiation and development of pits, and the electrochemical characteristics. The results indicated that(Mg6Fe2(OH)16(CO3)(H2O)4.5)0.25, a layered double hydroxide, has been detected for the first time in the corrosion products formed on stainless steel exposed to a simulated salt lake atmosphere. The specimens exposed to MgCl2 deposit conditions were corroded more severely than those exposed to NaCl deposit conditions, which was attributed to the differences in the deliquescence relative humidity and efflorescence relative humidity values of MgCl2 and NaCl. In addition, a special corrosion morphology consisting of a concentric circle of yellowish material was observed on the specimens exposed to MgCl2 deposit conditions, which was attributed to the formation of Mg(OH)2, inhibiting the diffusion and migration of OH- ions to the anode region. The maximum pit depth followed a power function with respect to corrosion time. The corrosion mechanism of stainless steel exposed to a simulated salt lake atmosphere is also discussed.

关键词： Atmospheric corrosion Stainless steel salt lake atmosphere Pitting corrosion

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