Influences of Concentrations of H<SUB>2</SUB>SO<SUB>4</SUB> and NaCl on Stress Corrosion Cracking of SUS304 Stainless Steel in H<SUB>2</SUB>SO<SUB>4</SUB>&ndash;NaCl Aqueous Solutions

Abstract

A stress corrosion cracking (SCC) test was carried out at room temperature in aqueous solutions containing both H 2 SO 4 (0-5.5 kmolÁm À3 ) and NaCl (0-4.5 kmolÁm À3 ), in order to study the influences of both solutes on the corrosion type of SUS304 steel. The two solutes have synergistic influence on the corrosion type, that is, SCC and general corrosion occur within a specific concentration range and elsewhere, respectively. For a constant H 2 SO 4 concentration the mass loss of corrosion shows a V-shape when it is plotted against NaCl concentration. On the other hand, maximum crack length of the SCC increases with increasing NaCl concentration up to a certain value, and then decreases. This gives a nearly inverse V-shape curve. In addition, the NaCl concentration ranges for the minimum mass loss and for the maximum crack length are almost the same. It was also confirmed that NaCl concentrations showing the minimum mass loss and the maximum crack length are inversely proportional to H 2 SO 4 concentrations.

Corrosion Behaviour Corrosion Behaviour of Cold-Deformed Austenitic Alloys

“…The corrosion behaviour of hydrogen-containing austenitic stainless steels has also been studied and it has become clear that the intergranular corrosion (Sunada et al, 2006) and the general corrosion (Osawa & Hasegawa, 1981;Sunada et al, 2006) were accelerated by hydrogenation. This phenomenon was noticed by the authors as "anomalous corrosion".…”

Chloride-Induced Stress Corrosion Cracking of Friction Stir-Welded 304L Stainless Steel: Effect of Microstructure and Temperature

“…The SCC tests in 3.5% NaCl + 5 N H 2 SO 4 solution were performed at room temperature (24-26 • C). This electrolyte was employed based on the results of Sunada et al [14] who investigated the influences of concentrations of H 2 SO 4 and NaCl on the SCC of 304 SS in H 2 SO 4 -NaCl aqueous solutions at 30 • C. The OCP of the specimen was continuously monitored. The SCC in MgCl 2 was carried out in boiling conditions (~155 • C) by refluxing the condensed water.…”

“…Acello and Green reported SCC of U-bend specimens of SUS 304 SS in H 2 SO 4 -NaCl solution at room temperature [11]. Other studies relating to the creep-corrosion interaction of 304 SS in 2.5 M H 2 SO 4 -0.5 M NaCl have also reported SCC failure of 304 SS tensile sample at 30 • C [12][13][14]. The SCC susceptibility of SUS304 was investigated in various NaCl (0-4.5 M) and H 2 SO 4 (0-5.5 M) concentrations.…”

“…SCC occurred in all NaCl concentrations above 0.2 M when the concentration of H 2 SO 4 was fixed at 0.5 M. Similarly, for 1.5 M H 2 SO 4 solution, SCC only occurred between 0.1-0.9 M NaCl concentration. All other NaCl concentrations (1.0-4.0 M) showed only general corrosion, not SCC [14]. The effect of NaCl concentration (with fixed H 2 SO 4 concentration) on the SCC crack length was also studied in the same study.…”

Stress Corrosion Cracking Behavior of 20MnTiB High-Strength Bolts in Simulation of Humid Climate in Chongqing

“…Ananya et al [11] studied the effect of environmental parameters and the material in corrosion medium on the corrosion and stress corrosion cracking of duplex stainless steel. Sunada et al [12] carried out the stress corrosion cracking test of SUS304 steel at room temperature in aqueous solution containing H 2 SO 4 (0-5.5 kmol/m − 3 ) and NaCl (0-4.5 kmol/m − 3 ). And the effect of H 2 SO 4 and NaCl on corrosion type of SUS304 steel was studied.…”