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首页> 外文期刊>Journal of Materials Engineering and Performance >Study on the Microstructure and Alternating Current Corrosion Behavior of SAF2507 Super-Duplex Stainless Steel in 3.5%NaCl Solution
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Study on the Microstructure and Alternating Current Corrosion Behavior of SAF2507 Super-Duplex Stainless Steel in 3.5%NaCl Solution

机译：3.5％NaCl溶液中SAF2507超双工不锈钢微观结构和交流腐蚀行为的研究

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摘要

The effect of solution annealing temperature on microstructure and the corresponding AC (alternating current) corrosion behavior was investigated by electrochemical impedance spectroscopy, polarization curve, Mott-Schottky curve and immersion test. With or without AC application, the 2507 SDSS (super-duplex stainless steel) samples annealed at various temperatures exhibit a difference in corrosion resistance. Among them, the corrosion resistance first increases and then decreases as the annealing temperature increases, that is, the 2507 SDSS annealed at 1060 degrees C has the optimum corrosion resistance, followed by the specimen annealed at 1000 degrees C, and finally the specimen at 1120 degrees C. The variation trends of R-ct, R-f and i(p) can verify the above law. The sigma phase and an excessive amount of alpha phase within the microstructure can decrease the corrosion resistance. Additionally, the stability and protective property of passive film formed on the electrode surface is associated with the microstructure of 2507 SDSS. An imposed AC can decrease the passivity of 2507 SDSS and damage the film formed on the sample surface. Furthermore, the corrosion rate and pitting sensitivity of the SDSS increase with the increasing AC current density.
机译：通过电化学阻抗光谱，偏振曲线，Mott-Schottky曲线和浸渍试验研究了解决方案退火温度对微结构的影响和相应的AC（交流电）腐蚀行为。使用或不使用AC应用，在各种温度下退火的2507个SDSS（超级双工不锈钢）样品表现出耐腐蚀性的差异。其中，随着退火温度的增加，耐腐蚀性首先增加，然后降低，即，在1060℃下退火的2507个SDS具有最佳耐腐蚀性，其次是在1000℃下退火的标本，最后将样品在1120处退火R-CT，RF和I（P）的变异趋势可以核实上述法律。微结构内的Sigma相和过量的α相可以降低耐腐蚀性。另外，在电极表面上形成的无源膜的稳定性和保护性与2507SDS的微观结构相关。施加的AC可以降低2507个SDS的钝化性并损坏在样品表面上形成的膜。此外，SDS的腐蚀速率和点蚀敏感度随着AC电流密度的增加而增加。

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