Observation by atomic force microscope of corrosion product during pitting corrosion on SUS304 stainless steel

Wang, Rongguang; Katô, Masahiko; Nakasa, Keijiro

doi:10.1016/j.scriptamat.2004.09.024

Cited by 34 publications

(26 citation statements)

References 13 publications

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“…The pit growth is always accompanied by the corrosion product of oxides and hydroxides of metals covering the pit, which accelerates the pit growth by promoting the accumulation of hydrogen and chloride ions into the pits, i.e., excessive hydrogen ions are produced in the pit with the hydrolysis reaction and the chloride ions migrate from outside to neutralize the excessive positive charges (Hisamatsu, 1981). The corrosion product on Type 304 steel in 3.5 mass% NaCl solution during the pitting corrosion was in-situ observed at room temperature by atomic force microscopy (AFM), as shown in Fig.1 (Zhang et al, 2005). A corrosion product crust covered perfectly a small pit at its initiation stage.…”

Section: Corrosion Process Of Stainless Steel With Formation Of Corromentioning

confidence: 99%

“…The mechanism is schematically shown in Fig.4. When the ultrasound is not applied, pits grow on the specimen surface (a) and corrosion product covers the pit (b) (Wranglen, 1985;Zhang et al, 2005). The growth of pit is accelerated due to the hydrogen ions produced by hydrolysis reaction and the chloride ions attracted from solution (c) (Wranglen, 1985).…”

Section: Suppression Of Pitting Corrosion On Stainless Steel By Ultramentioning

confidence: 99%

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Suppression of Corrosion Growth of Stainless Steel by Ultrasound

Wang¹

2012

Ultrasonic Waves

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Section: Corrosion Process Of Stainless Steel With Formation Of Corromentioning

confidence: 99%

Section: Suppression Of Pitting Corrosion On Stainless Steel By Ultramentioning

confidence: 99%

Suppression of Corrosion Growth of Stainless Steel by Ultrasound

Wang¹

2012

Ultrasonic Waves

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“…1) The authors 2) had confirmed the corrosion product on a SUS304 stainless steel in NaCl aqueous solution using an atomic force microscope (AFM). However, after the scanning of AFM probe removed the corrosion products, the growth rate of pits became small.…”

Section: Introductionmentioning

confidence: 99%

“…However, after the scanning of AFM probe removed the corrosion products, the growth rate of pits became small. 2) This was explained by the re-passivation of the inner walls of pits due to the decrease in hydrogen and chloride ions in pits by the stirring effect of AFM probe.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasonic Wave on the Growth of Corrosion Pits on SUS304 Stainless Steel

Wang

Nakasa

2007

Mater. Trans.

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Anodic polarization testing of SUS304 stainless steel was carried out in an aqueous solution of 3.5 mass% NaCl at a potential increasing at a constant rate of 20 mV/min. When the current density reached 2, 10 or 50 A/m 2 within the pitting corrosion region, the potential was kept at a constant value for 600 s at each current density. The ultrasonic wave (UW) was applied to the specimen from the beginning of test or just after the current density reached one of these constant values. The current density in these cases was compared with that without the application of UW. The results indicated that when the UW was applied from the beginning of test the current density was not affected by the application of UW in both the cathode and passive regions, but the increase in current density was suppressed by UW when the potential was kept at the constant value after the current density reached 10 or 50 A/m 2 . Also when the UW was applied just after the current density reached 2, 10 or 50 A/m 2 and the potential was kept at the constant value, the increase rate of current density was reduced by the application of UW. At the same time, the number and size of pits were decreased by the application of UW. The reason for the decrease in pitting corrosion was considered to be that UW destroyed the corrosion product on pits and the stirring effect of UW decreased the concentration of hydrogen and chloride ions in the pits, which accelerated the formation of a passive film on the pit wall.

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“…Therefore, when the passive film is broken down in aqueous solution containing chloride ions (Cl À ), pitting corrosion and crevice corrosion often occur. The growth of pit is always accompanied with the formation of corrosion product, which usually covers the pit and promotes the enrichment of chloride ions and hydrogen ions (H þ ) in pits during the process of the hydrolysis reaction, 1,2) thus, the pitting corrosion is accelerated. Cl À and H þ ions are also easily enriched in crevices of stainless steel to induce crevice corrosion.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ultrasound on Corrosion Behavior of SUS304 Stainless Steel with Crevice

Wang

Koshi

2008

Mater. Trans.

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Anodic polarization on SUS304 stainless steel with crevice was carried out in 3.5 mass% NaCl aqueous solution. After the anodic current density reached i ¼ 10, 12 or 50 A/m 2 , the potential at that moment was held constantly for a prescribed period. When an ultrasound (US) was applied to the specimen through the solution during the holding period of the potential, the current density on the specimen surface was measured and compared to that without the application of US. As a result, both the pitting corrosion and the crevice corrosion were largely suppressed by the application of US in the solution, and the corrosion current density changed almost synchronistically with the cyclic application and the stop of US. The above effect of US on the suppression of corrosion of SUS304 steel is attributed to the decrease or suppression of the enrichment of hydrogen ions and chloride ions in the crevice or the pits by the stirring effect of US.

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Observation by atomic force microscope of corrosion product during pitting corrosion on SUS304 stainless steel

Cited by 34 publications

References 13 publications

Suppression of Corrosion Growth of Stainless Steel by Ultrasound

Suppression of Corrosion Growth of Stainless Steel by Ultrasound

Effect of Ultrasonic Wave on the Growth of Corrosion Pits on SUS304 Stainless Steel

Influence of Ultrasound on Corrosion Behavior of SUS304 Stainless Steel with Crevice

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