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Effect of cerium on the initiation of pitting corrosion of 444-type heat-resistant ferritic stainless steel
High Temperature Materials and Processes ( IF 1.5 ) Pub Date : 2020-11-09 , DOI: 10.1515/htmp-2020-0001
Mingyu Ma 1 , Houlong Liu 1 , Liqing Chen 1
Affiliation  

Abstract The 444-type heat-resistant ferritic stainless steel is widely utilized in automotive exhaust pipes and solid oxide fuel cells, due to its excellent properties at elevated temperature. To meet the demands of significantly harsh service environments, rare earths were added in 444-type ferritic stainless steel. For the purpose of evaluating the effect of rare earths on pitting corrosion initiation, the metastable pitting corrosion behavior in 444-type ferritic stainless steel was studied through potentiodynamic polarization and potentiostatic polarization tests. The results demonstrated that pitting corrosion was initiated at the inclusion/alloy interface. The cerium alloying in 444-type ferritic stainless steel decreased the amount of preferential dissolution sites. The beneficial effect of Ce on pitting corrosion resulted from the formation of stable cerium oxides, as well as from the reduction in the amount and size of inclusions in 444-type ferritic stainless steel. In addition, electrochemical impedance spectroscopy test results revealed that cerium alloying enhanced the polarization resistance of passive films through insignificant thickness alteration.

中文翻译:

铈对444型耐热铁素体不锈钢点蚀萌生的影响

摘要 444型耐热铁素体不锈钢由于其优异的高温性能而广泛应用于汽车排气管和固体氧化物燃料电池。为了满足极其恶劣的使用环境的需求,在444型铁素体不锈钢中添加了稀土。为评价稀土对点蚀引发的影响,通过动电位极化和恒电位极化试验研究了444型铁素体不锈钢的亚稳态点蚀行为。结果表明,在夹杂物/合金界面处开始了点蚀。444 型铁素体不锈钢中的铈合金化减少了优先溶解位点的数量。Ce 对点蚀的有益作用源于稳定的氧化铈的形成,以及 444 型铁素体不锈钢中夹杂物数量和尺寸的减少。此外,电化学阻抗谱测试结果表明,铈合金化通过不显着的厚度变化提高了钝化膜的极化电阻。
更新日期:2020-11-09
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