Pitting corrosion resistance of austenitic and superaustenitic stainless steels in aqueous medium of NaCl and H2SO4

被引：21

作者：

Cardoso, Jorge Luiz ^{[1
]}

Silva Nunes Cavalcante, Alfredo Leao ^{[1
]}

Araujo Vieira, Regina Coeli ^{[1
]}

de Lima-Neto, Pedro ^{[2
]}

Gomes da Silva, Marcelo J. ^{[1
]}

机构：

[1] Univ Fed Ceara, Dept Met & Mat Engn, Ctr Technol, Campus Pici,Bloco 729, BR-60440900 Fortaleza, Ceara, Brazil

[2] Univ Fed Ceara, Dept Analyt Chem & Phys Chem, Ctr Sci, Campus Pici,Bloco 940, BR-60440900 Fortaleza, Ceara, Brazil

来源：

JOURNAL OF MATERIALS RESEARCH | 2016年 / 31卷 / 12期

关键词：

SIGMA-PHASE; INHIBITION; MOLYBDENUM; MO;

D O I：

10.1557/jmr.2016.198

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The pitting corrosion resistance of AL-6XN PLUS (TM) superaustenitic stainless steel, 304L, 316L, and 317L austenitic stainless steels was investigated using the cyclic polarization technique. These materials were evaluated in the as received condition and heat-treated at temperatures between 500 degrees C and 900 degrees C for 72 h. A thermodynamic simulation was performed using the software Thermocalc (R) to predict possible deleterious phases in selected temperatures. The simulations have predicted the sigma phase in the selected temperature range. An aqueous solution of sulfuric acid and sodium chloride was used as electrolyte in the corrosion tests. The results showed that pitting corrosion was not observed on the samples of AL-6XN PLUS (TM) steel. The 304L steel suffered pitting corrosion. All the polarization curves of this steel showed hysteresis characteristics of pitting corrosion. The 316L and 317L steels were resistant to pitting corrosion, but susceptible to crevice corrosion.

引用

页码：1755 / 1763

页数：9

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