Pitting corrosion behaviour of AISI 316L steel in chloride containing solutions

被引：1

作者：

Abd El Meguid, EA ^{[1
]}

Mahmoud, NA ^{[1
]}

Gouda, VK ^{[1
]}

机构：

[1] Natl Res Ctr, Dept Electrochem & Corros, Cairo, Egypt

来源：

BRITISH CORROSION JOURNAL | 1998年 / 33卷 / 01期

关键词：

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electrochemical potentiodynamic measurements have shown that the critical pitting potential E-pit of AISI 316L steel in aqueous solutions decreases linearly with increasing chloride ion concentration in the range 10(-3)-2.4 M NaCl and with increasing temperature from 30 to 70 degrees C. The critical chloride concentration for pitting at 30 degrees C is 10(-3) M in air saturated solutions, but this increases to 10(-2) M in solutions saturated by nitrogen or oxygen. Additions of either sodium thiosulphate ol sodium sulphide promote chlorine induced pitting corrosion in 0.6 M NaCl solution. This contrasts with the effect of increasing sodium sulphate additions, which result in increased resistance to pitting. Indeed, with Na2SO4 concentrations of 0.6 M and above there is complete immunity to pitting in 0.6 M NaCl solution. The chlorination of natural sea water by the addition of 100 ppm sodium hypochlorite promotes the nucleation of pitting by increasing the mixed potential to above E-pit. Scanning electron microscopy has revealed that corrosion pits with a lacelike appearance are formed in AISI 316L steel in both sodium chloride solutions and sea water.

引用

页码：42 / 48

页数：7

共 35 条

[1]

AbdelMeguid EA, 1997, BRIT CORROS J, V32, P68, DOI 10.1179/000705997798115156

[2] ENVIRONMENTAL-CONDITIONS LEADING TO PITTING CREVICE CORROSION OF A TYPICAL 12-PERCENT CHROMIUM STAINLESS-STEEL AT 80-C [J].

ATRENS, A .

CORROSION, 1983, 39 (12) :483-487

[3] HIGH-TEMPERATURE POTENTIAL/PH DIAGRAMS FOR IRON-WATER AND IRON-WATER-SULFUR SYSTEMS [J].

BIERNAT, RJ ;

ROBINS, RG .

ELECTROCHIMICA ACTA, 1972, 17 (07) :1261-&

[4] HIGH TEMPERATURE POTENTIAL/PH DIAGRAMS FOR SULPHUR-WATER SYSTEM [J].

BIERNAT, RJ ;

ROBINS, RG .

ELECTROCHIMICA ACTA, 1969, 14 (09) :809-&

[5]

BRAUNS E, 1961, ARCH EISENHUTTENWES, V32, P387

[6] THE PITTING CORROSION CHARACTERISTICS OF BORIDE-STRENGTHENED NICKEL-BASED AND IRON-BASED MICROCRYSTALLINE ALLOYS [J].

CHEN, TY ;

SZKLARSKASMIALOWSKA, Z .

CORROSION SCIENCE, 1988, 28 (01) :97-107

[7] INTERGRANULAR STRESS-CORROSION CRACKING OF AUSTENITIC STAINLESS-STEEL AT TEMPERATURES BELOW 100-C - A REVIEW [J].

CRAGNOLINO, G ;

MACDONALD, DD .

CORROSION, 1982, 38 (08) :406-424

[8]

DEVERALL HE, 1978, MATER PERFORMANCE, V17, P3

[9]

ELMEGUID EAA, 1994, MATER T JIM, V35, P699

[10]

Gallagher P., 1988, British Corrosion Journal, V23, P229, DOI 10.1179/000705988798270677

← 1 2 3 4 →