ChemInform Abstract: AC‐IMPEDANCE MEASUREMENTS ON ALUMINUM BARRIER‐TYPE OXIDE FILMS

Bessone, J.B.; Mayer, C.; Juettner, K.; Lorenz, W.J.

doi:10.1002/chin.198321014

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…(b) Nyquist plottwo parts: a capacitive loop occurring in relatively high-frequency region and an inductive loop present in a low-frequency region. The spectra from this study are in good agreement with those obtained in previous studies (Ref[35][36][37][38][39].Cao (Ref 40) suggested that these types of spectra could be described by the equivalent circuit inFig. 6under the following conditions: A <0, B> 0, and D-RtlAI > 0.…”

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confidence: 90%

Characterization of phosphate films on aluminum surfaces

Cheng

Ramamurthy

McIntyre

1997

J. of Materi Eng and Perform

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A thin layer of phosphate conversion coating was formed on pure aluminum in a commercial zinc-manganese phosphating bath. A number of surface analytical techniques were used to characterize the phosphate thin films formed after immersion times ranging from 30 s to 10 rain. The coating contained mainly a crystalline structure with dispersed micrometer-scale cavities. The major constituents of the phosphate film were zinc, phosphorus, and oxygen; a small amount of manganese was also detected. Based on these results, a three-stage mechanism was proposed for the formation and the growth of phosphate conversion coatings on aluminum. Electrochemical impedance spectroscopy was used to evaluate the corrosion performance of phosphated and uncoated aluminum samples in 0.50 M Na2SO 4 and 0.10 M H2SO 4 solutions. Both types of samples exhibited a passive state in the neutral solution and general corrosion behavior in the acid solution.

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confidence: 90%

Characterization of phosphate films on aluminum surfaces

Cheng

Ramamurthy

McIntyre

1997

J. of Materi Eng and Perform

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“…According to Rammelt 23 the dispersive behavior observed at rough electrodes can be described by a constant phase element (CPE). The impedance of this element is given by Equation 1: [23,24] (1)…”

Section: Resultsmentioning

confidence: 99%

Corrosion behavior of Ti and TI6Al4V in citrate buffers containing fluoride ions

Schmidt

Azambuja

2010

Mat. Res.

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The effect of fluoride ions concentration on the electrochemical behavior of Ti grade 2 and Ti6Al4V in citrate buffers was studied. Open circuit potential (OCP) measurements and voltammetric studies of the samples in the fluoride containing citrate buffers revealed a dissolution process when the pH falls below 5.0 and the NaF content is higher than 0.01 M. However, in citrate pH 7.6 the materials showed a passive behavior even in 0.1 M NaF. Some micrographs of Ti grade 2 obtained after longer immersion times in citrate pH 5.0 with 0.01 M NaF showed a surface attack. EIS (Electrochemical Impedance Sprectroscopy) data obtained at the OCP revealed that the film resistance decreases when the immersion time is increased in pH 5.0 containing 0.1 M NaF. In the citrate pH 7.6 the EIS data indicated a two-layer model of an oxide film consisting of a more compact inner layer and a porous outer layer. On the other hand, the EIS results in citrate pH 4.0 change significantly when the fluoride ions concentration increases from 0.01 to 0.05 M. The electrochemical data revealed that the corrosion behavior of Ti grade 2 and Ti6Al4V in the citrate buffers depends on the pH, the fluoride content and the exposure time.

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“…The time constant at high frequencies The reason for the different time constants as yet is unclear. Bessone et al (1983) indicated that the high frequency time constant could be attributed to the oxide layer on the steel. Brett (1990) reported that this time constant could be assigned to the interfacial reactions.…”

Section: Electrochemical Impedance Resultsmentioning

confidence: 99%

Corrosion inhibition mechanism of carbon steel by sodium N,N‐diethyl dithiocarbamate in hydrochloric acid solution

Fan

Wang

Guo

et al. 2002

Anti-Corrosion Methods and Materials

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The effect of sodium N,N‐diethyl dithiocarbamate (SDEDTC) on the corrosion of carbon steel in 0.5mol/L hydrochloric acid (HCl) solution was studied using weight loss, potentiodynamic polarisation curves and impedance measurement methods. Experimental results revealed that SDEDTC acted as an inhibitor in acid environments. Moreover, the compound was a mixed‐type inhibitor, acting predominantly as a cathodic inhibitor. Inhibition efficiency increased with increasing SDEDTC concentration at different temperatures. The corrosion inhibition mechanism of SDEDTC for carbon steel in HCl solution was also investigated by impedance techniques.

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ChemInform Abstract: AC‐IMPEDANCE MEASUREMENTS ON ALUMINUM BARRIER‐TYPE OXIDE FILMS

Cited by 8 publications

References 1 publication

Characterization of phosphate films on aluminum surfaces

Characterization of phosphate films on aluminum surfaces

Corrosion behavior of Ti and TI6Al4V in citrate buffers containing fluoride ions

Corrosion inhibition mechanism of carbon steel by sodium N,N‐diethyl dithiocarbamate in hydrochloric acid solution

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