Comparative Study of the Influence of Aging Time at 850 °C on the Electrochemical Behaviour of Two Cast Super Duplex Stainless Steel

被引：0

作者：

Cruz, A. L. S. ^{[1
,2
]}

de Lima, H. M. L. F. ^{[1
]}

Xavier, A. R. V. ^{[1
]}

Araujo, W. S. ^{[3
]}

Martins, M. ^{[4
]}

机构：

[1] Univ Fed Cariri, Ctr Ciencia & Tecnol, Rua Ten Raimundo Rocha,1639,Cidade Univ, Juazeiro Do Norte, CE, Brazil

[2] Univ Fed Sao Carlos, Programa Pos Graduacao Ciencia & Engn Mat, Rodovia Washington Luis,S-N, Sao Carlos, SP, Brazil

[3] Univ Fed Ceara, Dept Engn Metalurg & Mat, Ave Mister Hull,S-N,Pici, Fortaleza, CE, Brazil

[4] Ctr Univ Salesiano Sao Paulo, Dept Engn Elect, Rua Dom Bosco,100, Americana, SP, Brazil

来源：

MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS | 2023年 / 26卷 / suppl 1期

关键词：

Super duplex stainless steel; Sigma phase; Electrochemical behaviour; Copper; PASSIVE FILMS; SIGMA-PHASE; SEMICONDUCTING PROPERTIES; CORROSION-RESISTANCE; ELECTRONIC-STRUCTURE; ACID-MEDIA; PRECIPITATION; TEMPERATURE; IMPEDANCE; CU;

D O I：

10.1590/1980-5373-MR-2023-0034

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Two cast superduplex stainless steels were aged at 850 & DEG;C for different times. The effect of aging on the electrochemical behaviour and hardness of both steels has been investigated. A comparative study between the two steels was carried out considering the difference in chemical composition between the alloys, that is, the presence of copper and tungsten in the 6A steel. Corrosion resistance was evaluated by potentiodynamic polarization test, electrochemical impedance spectroscopy and Mott Schottky analysis. The results showed the beneficial effect of 0.99%pCu and 0.70%pW addition to the cast SDSS retarding the embrittlement of the 6A steel aged at 850 & DEG;C for 10 hours. The characteristic mechanism of localized corrosion in the aged samples for both materials was the selective dissolution of the ferrite phase.

引用

页数：11