Effects of scan rate on the potentiodynamic polarization curve obtained to determine the Tafel slopes and corrosion current density

Zhang, X.L.; Jiang, Ze; Yao, Zhongping; Song, Ying; Wu, Zh.D.

doi:10.1016/j.corsci.2008.12.005

Cited by 390 publications

(132 citation statements)

References 25 publications

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“…The corrosion current densities measured in the CMP chemical and tribocorrosion experiments may also support this opinion. The static current density under OCP, together with the current density calculated from Tafel plots, could indicate the corrosion behavior to some extent [21,24,48]. Figure 6 shows that without polishing, the corrosion current density in acid conditions is much higher than that under alkaline conditions, which corresponds well with the current density measured between sliding intervals at different pH values (Fig.…”

Section: Corrosion Behavior Of Copper In Periodate-based Solutionsupporting

confidence: 64%

Tribocorrosion Study of Copper During Chemical Mechanical Polishing in Potassium Periodate-Based Slurry

et al. 2015

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Copper chemical mechanical polishing (CMP) in barrier layer slurries with periodate as oxidant has not been intensively studied. This work presents an investigation into copper tribocorrosion in potassium periodatebased slurries during CMP. The research focused on copper tribocorrosion behavior, the surface chemical and electrochemical reaction products, and the electrochemical mechanism during CMP. The copper surface film was characterized by Raman spectra experiments. Tribocorrosion tests combined with CMP chemical experiments were conducted to study the tribochemical behavior and wearaccelerated corrosion effect. The results show that copper corrosion is more severe in acid solutions than in alkaline conditions. The copper surface is mainly passivated with copper oxides, copper hydroxide, and copper iodide. Small amounts of copper iodate, copper periodate, and iodine could be detected under specific pH conditions. Abrasion could help to get a uniform passivation film on copper surface consisting of copper oxides, copper hydroxide, and copper iodide only. The material loss due to wear-accelerated corrosion during CMP was also investigated. The results show that under weakly alkaline conditions (pH 9 and pH 10), the wear-corrosion effect plays an important role in the total material loss due to corrosion. The wearaccelerated corrosion is mainly caused by the exposure of more cathodic reaction sites to the slurry for participation in the redox reaction and the local galvanic corrosion during the CMP process. The high wear corrosion proportion of the total corrosion (DI c /I cc ) could help to obtain a better surface quality and desirable material removal rate during CMP.

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Section: Corrosion Behavior Of Copper In Periodate-based Solutionsupporting

confidence: 64%

Tribocorrosion Study of Copper During Chemical Mechanical Polishing in Potassium Periodate-Based Slurry

et al. 2015

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“…i corr values were determined by means of the Tafel extrapolation method by using the cathodic branches of the polarization curves. Firstly, it is seen that the cathodic branches of the polarization curves display a typical Tafel behavior instead of a limiting diffusion current, suggesting that the cathodic process is controlled by activation polarization instead of concentration polarization [19][20][21][22][23]. Secondly, the well-defined cathodic Tafel regions exist over one decade of current density which qualifies the other requirement for an accurate extrapolation.…”

Section: Potentiodynamic Polarizationmentioning

confidence: 90%

Corrosion fatigue crack growth behavior of oil-grade nickel-base alloy 718. Part 2: Effect of aging treatment

et al. 2015

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“…2(a-f) shows the potentiodynamic scans recorded for Hastelloy C-276 at 500 and 800°C, Hastelloy C-22 at 250 and 500°C and Stainless Steel 304 at 250 and 500°C in 13.4 NaCl: 33.7 KCl: 52.9 ZnCl 2 molten salt in the presence of air. In order to ensure a steady state polarization and to avoid disturbing the surface properties on the alloy electrode surfaces, a slower scan rate (0.1-0.3 mV s À1 ) and a narrow polarizing voltage window (±30 mV range from the OCV) were used, as suggested by Zhang et al [27]. The CR values estimated from the potentiodynamic scans are shown in Fig.…”

Section: Immersion Methodsmentioning

confidence: 99%

Vapor pressure and corrosivity of ternary metal-chloride molten-salt based heat transfer fluids for use in concentrating solar power systems

et al. 2015

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h i g h l i g h t sApplicability of NaCl-KCl-ZnCl 2 salts for CSP applications is evaluated. Corrosion rates are estimated by electrochemical and immersion methods. Hastelloys show corrosion rates of <10 lm/year at 800°C under anaerobic conditions. g r a p h i c a l a b s t r a c t a b s t r a c t Higher operating temperatures increase efficiency of the concentrating solar power plants but promote faster corrosion of the pipes and vessels made of Hastelloy or stainless steel materials for the moltensalt mixtures. Hastelloys C-276 and C-22 and stainless steel 304 coupons evaluated in the present study in a eutectic molten salt consisting of 13.4 mol% NaCl, 33.7 mol% KCl and 52.9 mol% ZnCl 2 showed substantially lower corrosion rates in the absence versus presence of air from 200 to 800°C as determined by electrochemical and gravimetric methods. In the presence of air, the corrosion rate for the Hastelloy C-276 in the molten salt was found to diminish with immersion time and converges around $50 lm per year after 4 weeks of immersion at 500°C, which is close to the value $40 lm per year obtained using the electrochemical method at 500°C. For anaerobic corrosion rate estimation, the corrosivity of an alloy sample was examined by immersing in molten salt inside a sealed quartz container without any contact with air, which is possible because the vapor pressure of the eutectic molten salt is only about 0.7 atm at 800°C. The corrosion rate of the Hastelloy C-276 was only 10 lm per year in the molten salt in the absence of air at 800°C, which is extremely low compared to 500 lm per year in conducting corrosion studies in the presence of air at 800°C. The Hastelloy coupons after immersion testing in the absence of air have then been examined also by SEM, and the images did not show any http://dx.

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Effects of scan rate on the potentiodynamic polarization curve obtained to determine the Tafel slopes and corrosion current density

Cited by 390 publications

References 25 publications

Tribocorrosion Study of Copper During Chemical Mechanical Polishing in Potassium Periodate-Based Slurry

Tribocorrosion Study of Copper During Chemical Mechanical Polishing in Potassium Periodate-Based Slurry

Corrosion fatigue crack growth behavior of oil-grade nickel-base alloy 718. Part 2: Effect of aging treatment

Vapor pressure and corrosivity of ternary metal-chloride molten-salt based heat transfer fluids for use in concentrating solar power systems

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