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为了研究节镍型含稀土双相不锈钢在中性氯化物溶液中的点蚀行为,采用阳极极化曲线、交流阻抗、扫描电镜(SEM)及X射线能谱仪(EDS)等方法研究了微量稀土元素对23Cr型双相不锈钢耐点蚀性能的影响。研究结果表明,加稀土后,23Cr型双相不锈钢在1.0 mol/L Na Cl溶液中的点蚀电位及钝化能力明显提高,稀土含量为0.028%的实验钢耐点蚀能力最强,稀土能提高23Cr型双相不锈钢的耐点蚀性能;硫化物夹杂是23Cr型双相不锈钢的主要点蚀诱发源;合适的稀土含量可以有效的净化钢液,变质长条硫化物夹杂为球状稀土夹杂;稀土夹杂弥散分布在钢中,且相互独立,不形成腐蚀的活性通道,抑制了23Cr型双相不锈钢点蚀的发生。
In order to study the pitting corrosion behavior of nodular nickel-containing duplex stainless steels in neutral chloride solution, the effects of trace amounts of anodic polarization, AC impedance, scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) Effect of Rare Earth Elements on Pitting Corrosion Resistance of 23Cr Duplex Stainless Steel. The results show that the pitting potential and passivation ability of 23Cr duplex stainless steel in 1.0 mol / L NaCl solution increase obviously when rare earth is added. The experimental steel with 0.028% rare earth has the strongest pitting corrosion resistance, the rare earth energy Improve the pitting corrosion resistance of 23Cr duplex stainless steel; sulfide inclusions are the main pitting inducement source of 23Cr duplex stainless steel; appropriate rare earth content can effectively purify molten steel; metamorphic long sulfide inclusions inclusions of spherical rare earth inclusions; Rare earth inclusions dispersed in the steel, and independent of each other, do not form the corrosion of the active channel, inhibiting the 23Cr duplex stainless steel pitting.