Electrochemical properties and growth mechanism of passive films on Alloy 690 in high-temperature alkaline environments

Huang, Jianhui; Wu, Xiaohu; Han, En‐Hou

doi:10.1016/j.corsci.2010.06.016

Cited by 197 publications

(89 citation statements)

References 48 publications

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“…This potential was the onset of transpassive status. Junbo Huang et al 41,42 found similar phenomena for Alloy 690 in alkaline solutions at different temperatures varying from 25…”

Section: Resultsmentioning

confidence: 73%

“…Transpassive dissolutions of Cr could be observed at elevated potentials. Junbo Huang et al 42 also investigated the electrochemical response and growth mechanism of the passive film on Alloy 690 in 0.15 mol/L Na 2 SO 4 and 0.04 mol/L NaOH solution at temperatures ranging from 25 to 300…”

Section: Resultsmentioning

confidence: 99%

“…Junbo Huang et al 42 investigated the electrochemical properties and growth mechanism of passive films on Alloy 690 in solutions at temperatures ranging from 25…”

Section: ••mentioning

confidence: 99%

See 2 more Smart Citations

pH Effect on Sulfur-Induced Passivity Degradation of Alloy 800 in Simulated Crevice Chemistries

Xia

Zhu

Behnamian

et al. 2014

J. Electrochem. Soc.

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The effects of pH on sulfur-induced passivity degradation of Alloy 800 in simulated crevice chemistries were evaluated using electrochemical impedance spectroscopy (EIS), secondary ion mass spectroscopy (SIMS), and Mott-Schottky analysis methods. Experimental results reveal that the detrimental effect of impurities containing sulfur at the reduced or intermediate oxidation level (S x ) on the passivity of Alloy 800 depends significantly on the solution pH. In neutral crevice (NC) chemistry containing chloride ions, the S x obstructs the healing process during repassivation, retards the dehydration reaction and also incorporates H, -OH and S into the passive film. However, the detrimental effect of S x is insignificant in an alkaline crevice (AKC) solution due to a change in surface adsorption and surface charge. Impurities containing sulfur at the reduced or intermediate oxidation level would cause Alloy 800 to lose its passivity and become active in an acidic crevice (AC) chemistry. Experimental evidence also indicates that the solution pH alters the semiconductor type of the surface film -from n-type in NC solution to p-type in AKC solution.

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“…This potential was the onset of transpassive status. Junbo Huang et al 41,42 found similar phenomena for Alloy 690 in alkaline solutions at different temperatures varying from 25…”

Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

pH Effect on Sulfur-Induced Passivity Degradation of Alloy 800 in Simulated Crevice Chemistries

Xia

Zhu

Behnamian

et al. 2014

J. Electrochem. Soc.

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“…In addition, this hydrothermal-electrochemical technique also gave products with much higher homogeneity than solid state processing. Huang et al [40] suggested that the increasing alkaline solution temperature (<300°C), the mass transportation rate of the solution greatly increased resulting the thickness of the passive films increases. Therefore, it could be said that the reaction temperature of hydrothermal treatment is the key variable parameter to get magnetite film on the surface of mild steel [2].…”

Section: Resultsmentioning

confidence: 99%

Magnetite thin film on mild steel formed by hydrothermal electrolysis for corrosion prevention

Machmudah

Zulhijah

Diono

et al. 2015

Chemical Engineering Journal

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h i g h l i g h t sMagnetite was formed dominantly on the surface of mild steel with black color. The growth rate of magnetite film increased with increasing temperature and reaction time. The magnetite films formed on the mild steel surface could prevent or minimize the corrosion on its surface. a b s t r a c tMagnetite film was successfully prepared on the mild steel surface in alkaline environment by hydrothermal electrolysis treatment. The principle of hydrothermal electrolysis is applying current directly to electrolyte solution at hydrothermal conditions. The anodizing of mild steel was conducted at temperatures of 100-200°C and applied current densities of 0.1-0.4 A/cm 2 for 5-60 min reaction time with sodium hydroxide (NaOH) as an electrolyte solution (5-15%). Magnetite film on the mild steel surface was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and cyclic voltammetry. The patterns of XRD showed that magnetite was formed dominantly in the surface of mild steel with black color. Cyclic voltammetry analysis showed that the magnetite films produced on the mild steel surface could prevent or minimize the corrosion on its surface.

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“…However, many types of corrosion still happened since it was exposed to a highly aggressive water chemistry environment containing some oxidizing impurities. [1][2][3][4][5][6][7] Among the impurities in the SG crevices, Pb has been recognized as one of the primary contributors to the SCC failure of SG tubing materials. It is well known that the corrosion resistance of alloy is attributed to the formation of a protective passive film on its surface.…”

mentioning

confidence: 99%

Lead-induced stress corrosion cracking behavior of mechanically surface-treated alloy 690

Shi

Luo

et al. 2016

Materials Research Letters

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Electrochemical properties and growth mechanism of passive films on Alloy 690 in high-temperature alkaline environments

Cited by 197 publications

References 48 publications

pH Effect on Sulfur-Induced Passivity Degradation of Alloy 800 in Simulated Crevice Chemistries

pH Effect on Sulfur-Induced Passivity Degradation of Alloy 800 in Simulated Crevice Chemistries

Magnetite thin film on mild steel formed by hydrothermal electrolysis for corrosion prevention

Lead-induced stress corrosion cracking behavior of mechanically surface-treated alloy 690

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