An electrochemical impedance spectroscopy study of the corrosion behaviour of PVD coated steels in 0.5 N NaCl aqueous solution: Part I. Establishment of equivalent circuits for EIS data modelling

Liu, C; Bi, Qiang; Leyland, A.; Matthews, A.

doi:10.1016/s0010-938x(02)00213-5

Cited by 339 publications

(174 citation statements)

References 25 publications

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“…11,[16][17][18][19][20][21] Based on Figure 12, it was concluded that the semiconductor layer formed on the TiN-coated substrate was n-type (presumably TiO 2 ), in agreement with the literature. 11,21 The Mott-Shottky equation on page 127 in 20 was used to determine the flat band potential and the density of the charge (density of donors for n-type semiconductor) in the space-charge region.…”

Section: Mott-shottky Analysis Of the Tin Coatingsupporting

confidence: 80%

“…The n value is related to the roughness and the inhomogeneity of the passive (capacitive) film and is less than 1 when the surface is rough. 17,18,23 The n value was about 0.84 (Table 1), and constant during the exposure, indicating that the surface roughness (surface area) did not change during the immersion.…”

Section: Corrosion Of the Substrate And The Tin-coated Substrate And mentioning

confidence: 95%

“…In the literature, the single phase of the TiN coating was generally obtained with various N 2 pressures, since TiN was stable across a wide stoichiometric range. [11][12][13][14][15][16][17][18][19] The grain morphology of the TiN coating was columnar (Figure 4). The columnar grain boundaries in the TiN coatings, aligned perpendicularly from the topmost surface down to the substrate/coating interface (Figure 4), were considered to be an easy path for the penetration of the electrolyte.…”

Section: Structure Of the Tin Coatingsmentioning

confidence: 99%

“…It has been well known that any parallel RC circuit found in the EC represents a time constant (t), corresponding to the characteristic frequency (w c ). 18,19,22 Because of one time constant observation in the Bode and Nyquist plots and the absence of pitting corrosion, the EIS model (Figure 8a) proposed for uncoated substrates to simulate the interacting of the electrolyte with the surface consisting of a solution resistance (R sol. ) and in parallel the total resistance of the passive layer (capacitive layer), R passive with constant phase elements (CPE) of the passive layer.…”

Section: Corrosion Of the Substrate And The Tin-coated Substrate And mentioning

confidence: 99%

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Pitting corrosion of TiN-coated stainless steel in 3 % NaCl solution

Küçük¹,

Sarıoğlu²

2015

Mater. Tehnol.

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TiN coatings deposited by arc PVD were characterized by XRD and SEM. In-situ measurements of the corrosion of the substrate and the TiN-coated substrate were made using the corrosion potential (Cor.Pot.), the polarization resistance (PR) method and electrochemical impedance spectroscopy (EIS) in a 3 % NaCl solution as a function of the immersion time. The semiconductor scale formed on the TiN was identified using a Mott-Shottky analysis as an n-type semiconductor with a flat band potential of -0.83 V vs. SCE. The TiN coating (0.5 μm thick) consisted of cubic TiN exhibiting columnar grains, pin holes, voids and porosities. The pitting corrosion of the TiN, observed visually between 1 h and 2 h, was captured by EIS and PR. The electrical circuit (EC) model used for the EIS data supported the degradation of the coating through pitting corrosion, in agreement with the visual observations. The corrosion resistance (polarization resistance) determined by the polarization resistance method (Rp) and the EIS (Rtotal) decreased suddenly during the pitting corrosion. The corrosion resistance of the TiN-coated substrate was greater than the corrosion resistance of the substrate during the approximately 24 h of exposure. Keywords: stainless steel, TiN, coating, EIS, polarization resistance, pitting corrosion Prevleka TiN, nanesena z oblo~nim PVD-postopkom, je bila pregledana z XRD in SEM. In-situ meritve korozije podlage in podlage s prevleko iz TiN so bile izvr{ene z metodo korozijskega potenciala (Cor.Pot.), polarizacijske upornosti (PR) in z elektrokemijsko impedan~no spektroskopijo (EIS) v 3-odstotni raztopini NaCl v odvisnosti od~asa namakanja. Mott-Shottkyjeva analiza je odkrila nastanek n-tipa polprevodne {kaje na TiN s potencialom ravnih nivojev -0.83 V proti SCE. Prevleko TiN (debeline 0,5 μm) sestavljajo kubi~ni TiN s stebrastimi zrni, luknjami, prazninami in poroznostjo. Vidno odkrita jami~asta korozija TiN, opa`ena med 1 h in 2 h, je bila posneta z EIS in PR. Model elektri~nega tokokroga (EC), ki je bil uporabljen za EIS-podatke, podpira degradacijo prevleke z jami~asto korozijo, skladno z vizualnimi opa`anji. Korozijska upornost (polarizacijska upornost), dolo~ena z metodo polarizacijske upornosti (Rp) in EIS (Rtotal) se je nenadno zmanj{ala med jami~asto korozijo. Korozijska upornost podlage z nanosom TiN je bila ve~ja kot korozijska obstojnost podlage med izpostavitvijo okrog 24 h.

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Section: Mott-shottky Analysis Of the Tin Coatingsupporting

confidence: 80%

Section: Corrosion Of the Substrate And The Tin-coated Substrate And mentioning

confidence: 95%

Section: Structure Of the Tin Coatingsmentioning

confidence: 99%

Section: Corrosion Of the Substrate And The Tin-coated Substrate And mentioning

confidence: 99%

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Pitting corrosion of TiN-coated stainless steel in 3 % NaCl solution

Küçük¹,

Sarıoğlu²

2015

Mater. Tehnol.

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“…The circuit a is typical of oxide-coated metals [9,12,22,23]. The circuit b presents an additional Page 7 of 43 A c c e p t e d M a n u s c r i p t 7 Warburg element that could be attributed to a diffusion process [24,25]. The experimental data were fitted to the proposed equivalent circuit using ZView  [26].…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments

Yohai¹,

Vázquez²,

Valcarce³

2013

Electrochimica Acta

142

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Please cite this article as: L. Yohai, M. Vázquez, M.B. Valcarce, Phosphate ions as corrosion inhibitors for reinforcement steel in chloride-rich environments, Electrochimica Acta (2013), http://dx.doi.org/10. 1016/j.electacta.2013.03.180 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Micro Raman spectra clearly show the incorporation of phosphates to the passive film.Impedance spectroscopy results can be interpreted assuming a duplex surface film formed in the presence of phosphates. In the conditions of this investigation, phosphate ions behave as mixed-type corrosion inhibitors, protecting steel against corrosion in chloride-contaminated environments.

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