Effect of Temperature on the Crevice Corrosion of Type 304 Stainless Steel in Chloride Solution up to 250°C

CORROSION ◽  
1990 ◽  
Vol 46 (9) ◽  
pp. 727-733 ◽  
Author(s):  
H. Yashiro ◽  
K. Tanno ◽  
H. Hanayama ◽  
A. Miura
Keyword(s):  
Stainless Steel ◽  
Crevice Corrosion ◽  
Chloride Solution ◽  
304 Stainless Steel ◽  
Effect Of Temperature ◽  
Type 304 ◽  
Type 304 Stainless Steel

Susceptibility of 304 Stainless Steel to Crevice Corrosion in Electrochemically Active Fluids

CORROSION ◽  
10.5006/3324 ◽  
2020 ◽  
Vol 76 (4) ◽  
pp. 424-435
Author(s):  
Abinaya Kamaraj ◽  
Johann Wilhelm Erning
Keyword(s):  
Stainless Steel ◽  
Crevice Corrosion ◽  
Chloride Concentration ◽  
304 Stainless Steel ◽  
Water Composition ◽  
Polyether Ether Ketone ◽  
Electrochemically Active ◽  
Ether Ketone ◽  
Type 304 ◽  
Type 304 Stainless Steel

The susceptibility of Type 304 stainless steel (SS) to crevice corrosion upon contacting with electrochemically active fluids was investigated using exposure tests and stepwise potentiostatic polarization. Crevice materials made of 304 SS and polyether ether ketone (PEEK) were focused on in this study. The combined influence of oxidant and chloride concentration on crevice corrosion was examined in detail in the two types of crevice combinations (304 SS-to-PEEK and 304 SS-to-304 SS). The 304 SS specimens were strongly susceptible to crevice corrosion when coupled with 304 SS. Even at a low concentration of 5 mg/L free chlorine and 150 mg/L chloride, which is below nominal dilutions in beverage industries, the examined specimens underwent crevice corrosion in both crevices. The effect of water composition on crevice corrosion was also studied, indicating high susceptibility of 304 SS to crevice corrosion in low pH (pH ≤ 5) solutions. The corroded surface morphology was analyzed using scanning electron microscope, energy dispersive x-ray, and confocal microscope.

Effects of Sulfur Compounds on the Pitting Behavior of Type 304 Stainless Steel in Near-Neutral Chloride Solutions

CORROSION ◽  
1982 ◽  
Vol 38 (5) ◽  
pp. 261-265 ◽  
Author(s):  
R. C. Newman ◽  
H. S. Isaacs ◽  
B. Alman
Keyword(s):  
Stainless Steel ◽  
Chloride Solution ◽  
Surface Deformation ◽  
304 Stainless Steel ◽  
Pitting Potential ◽  
Acidic Solutions ◽  
Type 304 ◽  
Type 304 Stainless Steel ◽  
Sulfur Containing ◽  
Effect Of Surface

Abstract Pitting potentials have been measured potentiodynamically for Type 304 stainless steel in neutral or mildly acidic solutions containing 0.25M NaCl and various concentrations of sulfur species from 0 to 2 molar. Additions of 0.01 to 0.02M Na2S2O3 lowered the pitting potential by more than 300 mV, while additions of more than 0.5M Na2S2O3 inhibited pitting. KSCN showed similar but less marked effects, while increasing Na2S additions up to 0.1 molar (giving H2S and HS− at neutral pH) caused an increasing reduction in the pitting potential. Additions of Na2S4O6 up to 0.05M promoted pitting, but addition of 0.01 M Na2SO3 had no effect. Parallel pitting potential measurements using a scratch technique gave lower values for the sulfur containing solutions but a higher value for the plain chloride solution; this effect of surface deformation was also reflected in the results obtained potentiodynamically on abraded and electropolished surfaces.

Effects of Chloride, Bromide, and Thiosulfate Ions on the Critical Conditions for Crevice Corrosion of Several Stainless Alloys as a Material for Geological Disposal Packages for Nuclear Waste

1992 ◽  
Vol 294 ◽  
Author(s):  
Guen Nakayama ◽  
Hisao Wakamatsu ◽  
Masatsune Akashi
Keyword(s):  
Stainless Steel ◽  
Nuclear Waste ◽  
Crevice Corrosion ◽  
304 Stainless Steel ◽  
Critical Conditions ◽  
Geological Disposal ◽  
Steel Type ◽  
316 Stainless Steel ◽  
Type 304 ◽  
Type 304 Stainless Steel

ABSTRACTIn addition to mild steel, several stainless alloys are being proposed as materials for packages for geological disposal of high-level nuclear waste. When buried deep underground, the greatest detriment to the integrity of packages made of these alloys is localized corrosion, for which critical conditions for initiation of crevice corrosion in chloride environments, with or without other ions, need be precisely known.Crevice corrosion behavior of Type 304 stainless steel, Type 316 stainless steel, Alloy 825, Ti-Gr.1, and Ti-Gr.12 in solutions containing ions of chloride, bromide (these two for their ordinary presence in natural waters), or thiosulphate (this for the likelihood of microbially influenced corrosion) to varying concentrations have been empirically examined. All of these alloys exhibit much the same concentration dependency of crevice corrosion sensitivity for chloride and bromide ions, while Type 304 stainless steel is particularly sensitive to the thiosulphate ion. The region of insensitivity for chloride ion is wider in the increasing order of Type 304 stainless steel, Type 316 stainless steel, Ti-Gr. 1, and Ti-Gr. 12, with that of Alloy 825 lying somewhere in between.

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