Manganese Effects on Repassivation Kinetics and SCC Susceptibility of High Mn–N Austenitic Stainless Steel Alloys

Toor, Ihsan‐ul‐Haq; Park, Kyung Jin; Kwon, Hyuk‐Sang

doi:10.1149/1.2752089

Cited by 23 publications

(16 citation statements)

References 29 publications

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“…Previous studies on the repassivation behavior of the stainless steels by rapid scratch test [7][8][9][10]19 also showed similar trends of current transients and passive film growth/repassivation. It has been reported that cBV, a slope in the log i(t) vs. 1/q(t) plot, can be used as an effective measure of the repassivation rate of an alloy.…”

Section: Effect Of Tio 2 On the Repassivation Kineticssupporting

confidence: 62%

Effect of TiO2 on the Repassivation Kinetics of Alloy 600 in Caustic Solutions

Toor¹,

Ejaz²,

Kwon³

2013

Corrosion

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Effects of titanium dioxide (TiO 2 ) inhibitor on repassivation kinetics and defect density of the passive film formed on Alloy 600 (UNS N06600) were examined. Addition of 0.05 g/L TiO 2 powder increased the repassivation rate of Alloy 600. Passive film initially nucleated and grew according to the place exchange model in which log i(t) is linearly proportional to q(t), and later it grew according to high-field ion conduction model in which log i(t) is linearly proportional to the 1/q(t). Ti enrichment in the film decreased the defect density of the film and increased its protectiveness.

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Section: Effect Of Tio 2 On the Repassivation Kineticssupporting

confidence: 62%

Effect of TiO2 on the Repassivation Kinetics of Alloy 600 in Caustic Solutions

Toor¹,

Ejaz²,

Kwon³

2013

Corrosion

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“…The published literature 16,[24][25][26] showed the effects of other alloying elements like Ni, Mo, and Cr on the repassivation kinetics, but the effects of Si on the repassivation kinetics are rarely reported. To examine the independent effects of Si on the repassivation kinetics of Fe-20Cr SS, Fe-20Cr-xSi ͑x = 0, 1, 2͒ alloys were prepared by vacuum-arc melting.…”

Section: Resultsmentioning

confidence: 99%

“…3-6, it is clear that the repassivation kinetics of 304Si SS is similar to those confirmed for other austenitic or ferritic SSs. 19,24 The growth of the passive film on 304Si SS during repassivation followed the same mechanisms applied to other austenitic and ferritic SSs. Cho et al 25 examined the effects of alloying element on the repassivation kinetics of ferritic SSs and found that the repassivation rate increases with increasing contents of Cr and Mo.…”

Section: C497mentioning

confidence: 97%

Effects of Si on the Repassivation Kinetics and SCC Susceptibility of Stainless Steels

Toor

Kwon

2008

J. Electrochem. Soc.

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Effects of Si on the repassivation kinetics and stress corrosion cracking ͑SCC͒ of alloy 304Si were examined by a scratch electrode technique and slow strain rate test in chloride solutions and compared with those of other stainless steels ͑SSs͒, 304 and 316L. Repassivation kinetics of these alloys and Fe-20Cr-xSi ͑x = 0-2͒ alloy were analyzed in terms of the current density, i͑t͒, flowing from the scratch as a function of the charge density, q͑t͒, that has flowed from the scratch. Passive film initially nucleated and grew according to the place exchange model, and then grew according to a high-field ion-conduction model in which log i͑t͒ has a linear relationship with 1/q͑t͒ with a slope of cBV. The repassivation rate of Fe-20Cr-xSi ͑x = 0-2͒ alloys, evaluated by the cBV value, increased with an increase in Si content. Furthermore, repassivation rate decreased on the order of 304Si, 316L, and 304. The resistance to SCC of the SSs ͑304Si, 304, and 316L͒ measured in 35 wt % MgCl 2 solution at 120°C was in good agreement with those predicted based on the repassivation kinetics. The beneficial effects of Si on SCC of 304Si SS appears to be associated with the enrichment of Si in the passive film.Type 304 stainless steels ͑SSs͒ have traditionally been used as a material for hot water storage tank applications in Korea because of their good corrosion resistance, formability, and weldability. However, some stress corrosion cracking ͑SCC͒ incidents were reported in tanks made of 304 SS, even after a few months in operation. Subsequent investigation and research by Pohang Iron and Steel Co. ͑POSCO͒ steel led to the development of a new alloy named 304Si SS. Small amounts of Si, Cu, and W were added in the new alloy to improve its SCC resistance over conventional 304 SS. The published literature has shown that Si improves the localized corrosion resistance of the SSs by moving the pitting potential in the noble direction. 1-5 Osozawa and Engell 6 and Desestret and Wagner 7 prepared high-silicon-containing SSs ͑up to 4 wt %͒ for use in highly oxidizing environments and found that Si has substantially increased the resistance to pitting corrosion. According to Streicher, 4 the increase in the resistance to pitting corrosion of the Si-containing SS alloys is due primarily to the change produced at grain boundaries by Si; Si eliminated all grooving at grain boundaries. Rhodin 8 suggested that the positive effect produced by Si is due to the increased stability of the passive state, resulting from an increase in the Si content of the protective film. Thomasov et al. 9 found that Si decreased the corrosion rate simultaneously with a considerable increase in the pitting potential of the alloys. Other researchers reported that the addition of copper in ferritic, austenitic, and duplex SSs improves the resistance to uniform corrosion in sulfuric acid media. 10-12 Greene and Wilde 13 found that Cu excels among alloying elements in decreasing the critical current density, which is a criterion to assess the passivation tendency of t...

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“…Repassivation behaviour of Cr-Mn alloys was found similar to that of Cr-Ni alloys, but effect of N was more pronounced in Cr-Mn steels leading to faster repassivation rate. Contrast to this fact, I.-ul-H. Toor et al 7) have reported deleterious effect of Mn on the repassivation behaviour and SCC behaviour of stainless steels in chloride containing solutions. The repassivation rate of the alloy decreases with an increase of Mn content.…”

Section: Introductionmentioning

confidence: 92%

“…4) However, the number of research works on the corrosion behaviour of 200 series is limited compared to that on 300 series stainless steels and there is some discrepancy on the role of Mn. [5][6][7] Fourie and Bentley 5) investigated the corrosion behaviour of austenitic stainless steels with replacement of 8 % Ni by 15 % Mn in 0.05 M H 2 SO 4 . They report addition of 15 % Mn to Fe-17Cr alloy decreases the ability to passivate, but partial replacement of Ni with Mn does not change its passivity.…”

Section: Introductionmentioning

confidence: 99%