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首页> 外文期刊>Corrosion Engineering, Science and Technology >Pitting corrosion of thermally aged cast duplex stainless steel for primary coolant pipes of nuclear power plants
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Pitting corrosion of thermally aged cast duplex stainless steel for primary coolant pipes of nuclear power plants

机译：核电厂原发性冷却剂管的热老化铸双相不锈钢的蚀腐蚀

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摘要

The pitting corrosion of thermally aged Z3CN20.09M cast duplex stainless steel (CDSS) was investigated using potentiodynamic polarisation and electrochemical impedance spectroscopy. Both pitting potential and charge transfer resistance values of thermally aged specimens became less positive with aging time, while passive current density increased, indicating that thermal aging causes degradation in pitting corrosion resistance. The pitting potential of thermally aged specimens after annealed is higher than that of thermally aged specimens revealing that the pitting corrosion resistance of annealed specimens has been improved. The ' phase precipitation during thermal aging in ferrite brings the Cr-enriched and Cr-depleted zone microstructures which mainly induced the degradation of pitting corrosion resistance. The microsegregation of Cr element or Cr enriched and Cr-depleted zones will be alleviated or even removed due to the Cr-rich ' phases dissolution during the process of annealing. So, the pitting corrosion resistance of annealed specimens is improved.
机译：使用电位偏振和电化学阻抗光谱研究了热老化Z3CN20.09M浇注双相不锈钢（CDS）的蚀腐蚀。热老化试样的蚀电位和电荷传递电阻值与老化时间不那么阳性，而无源电流密度增加，表明热老化导致蚀腐蚀性的降解。退火后热老化试样的蚀潜力高于热老化试样的蚀力，显示出退火标本的蚀腐蚀性已经提高。铁氧体中热老化期间的相沉淀带来了CR富集的和CR耗尽区微结构，主要诱导了蚀腐蚀性的劣化。 Cr元素或Cr富集和Cr耗尽区的微量测定将被缓解或甚至由于退火过程中的Cr-Rich的阶段溶解而被缓解或甚至除去。因此，改善了退火标本的点蚀耐腐蚀性。

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