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Effect of microstructure and passive film on corrosion resistance of 2507 super duplex stainless steel prepared by different cooling methods in simulated marine environment
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-08-15 , DOI: 10.1007/s12613-020-2094-0
Min Zhu , Qiang Zhang , Yong-feng Yuan , Shao-yi Guo

The effect of microstructure and passive film on the corrosion resistance of 2507 super duplex stainless steel (SDSS) in simulated marine environment was investigated by electrochemical measurements, periodic wet-dry cyclic corrosion test, scanning Kelvin probe force microscopy, atomic force microscopy, and X-ray photoelectron spectrometry. The results show that the occupation ratio of γ phase increases with the decrease in cooling rate, whereas the content of α phase reduces gradually. In addition, the σ precipitated phase only emerges in the annealed steel. The pitting sensitivity and corrosion rate of 2507 SDSS reduce first and then increase as the cooling rate decreases. The σ precipitated phase drastically reduces the protective ability of the passive film and facilitates micro-galvanic corrosion of the annealed steel. For various microstructures, the pits are preferentially distributed within the σ and γ phases. The corrosion resistance of 2507 SDSS prepared by different cooling methods is closely related to the microstructure and structure (stability and homogeneity) of the passive film. Normalized steel shows an optimal corrosion resistance, followed by the quenched and annealed steels.



中文翻译:

模拟海洋环境中不同冷却方式制备的2507超级双相不锈钢的显微组织和钝化膜对耐蚀性的影响

通过电化学测量,定期干湿循环腐蚀试验,扫描开尔文探针力显微镜,原子力显微镜和X射线研究了微观结构和钝化膜对2507超级双相不锈钢(SDSS)在模拟海洋环境中的耐腐蚀性的影响。射线光电子能谱。结果表明,随着冷却速率的降低,γ相的占有率增加,而α相的含量逐渐减少。此外,σ析出相仅出现在退火钢中。2507 SDSS的点蚀敏感性和腐蚀速率先降低,然后随着冷却速率的降低而增加。σ沉淀相大大降低了钝化膜的保护能力,并促进了退火钢的微电腐蚀。对于各种微观结构,凹坑优先分布在σ和γ相中。通过不同的冷却方法制备的2507 SDSS的耐腐蚀性与钝化膜的微观结构和结构(稳定性和均质性)密切相关。正火钢表现出最佳的耐腐蚀性,其次是淬火和退火钢。

更新日期:2020-08-15
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