Quantitative determination of through-coating porosity in thin ceramic physically vapour-deposited coatings

Célis, Jean-Pierre; Drees, Dirk; Maesen, Erwin; Roos, Jozef

doi:10.1016/0040-6090(93)90458-2

Cited by 25 publications

(11 citation statements)

References 4 publications

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“…The through-porosity rate is defined in terms of the area ratio between the substrate surface (in contact with the solution through the porosity) and the coating surface. Electrochemical techniques, such as linear polarisation, Tafel extrapolation, cyclic voltammetry, anodic polarisation and coulometric method are frequently used to quantitatively assess the through-porosity of various protective coatings [7,[36][37][38]. Such techniques have been used to determine the through-porosity rate in electroless nickel coatings on steel and aluminium substrates [37,38].…”

Section: Quantitative Determination Of Through-porositymentioning

confidence: 99%

“…Various methods have been developed to evaluate the throughporosity of coatings [7,[35][36][37]. The through-porosity rate is defined in terms of the area ratio between the substrate surface (in contact with the solution through the porosity) and the coating surface.…”

Section: Quantitative Determination Of Through-porositymentioning

confidence: 99%

“…Coulometric method [36,39] is based on Faraday's law. According to this law, the amount of the oxidised material is proportional to the electrical charge measured during anodic polarisation.…”

Section: Quantitative Determination Of Through-porositymentioning

confidence: 99%

See 2 more Smart Citations

Characterisation of three-dimensional porosity in an Fe-based amorphous coating and its correlation with corrosion behaviour

et al. 2015

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Section: Quantitative Determination Of Through-porositymentioning

confidence: 99%

Section: Quantitative Determination Of Through-porositymentioning

confidence: 99%

See 1 more Smart Citation

Characterisation of three-dimensional porosity in an Fe-based amorphous coating and its correlation with corrosion behaviour

et al. 2015

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“…9. Through-coating porosity was defined as a ratio of the cathode current density for the coated specimens (i E = À750 mV) to the current density for the uncoated specimens (i 0 E = À750 mV) at potential E SCE = À750 mV [39][40][41][42] …”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Effect of nanosilica type on protective properties of composite ceramic coatings deposited on steel 316L by sol–gel technique

Chęcmanowski¹,

Szczygieł²

2008

Journal of Non-Crystalline Solids

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“…From such a perspective, relationships between protective quality and process parameters are reported frequently. [3][4][5][6][7] Notwithstanding, very little information addresses essential factors that influence films' protective quality, e.g. causes of through-film defect formation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Compressive Stress on Corrosion-Protective Quality and Its Maintenance under a Corrosive Environment for TiN Films Deposited by Reactive HCD Ion Plating

2004

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Titanium nitride films were deposited onto SUS304 substrates under various film thickness, deposition temperatures, and substrate bias voltages. Their protective quality was evaluated by electrochemical testing in accordance with the critical passivation current density (CPCD) method. Two types of tests were employed to evaluate corrosive behavior of coated substrates: a high-temperature and high-pressure corrosion test; and a measurement of the change in anodic current density with immersion time. A scanning electron microscope was used to examine surface morphology and fractured cross-sections of the films. Residual stress in the films was determined by the sin 2 method. An increase in film thickness engendered high protective quality. That protective quality was improved with increasing deposition temperature; micrometerorder pores were observed on all parts of films deposited at lower deposition temperatures, whereas few pores existed on films deposited at higher temperatures. This result indicates that these pores are one factor influencing overall protective quality. A film deposited with no substrate bias voltage displayed morphology with a typical columnar-structure; it also demonstrated complete protective quality. As the bias voltage increased, protective quality deteriorated, whereas an excess increase in the bias voltage gave rise to a slightly higher protective quality. Films with lower compressive stress had only a few pores and possessed higher protective quality, suggesting that pore formation originates in compressive stress. Corrosion tests indicated that the coated substrates corroded more rapidly as compressive stress in the film increased. The effect of compressive stress on maintenance of corrosion-protective quality was treated quantitatively. The rate of increase in the exposed area of the substrate was estimated from variation of an anodic current density with immersion time. This evaluation indicates that a decrease in compressive stress contributes greatly to maintenance of protective quality.

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Quantitative determination of through-coating porosity in thin ceramic physically vapour-deposited coatings

Cited by 25 publications

References 4 publications

Characterisation of three-dimensional porosity in an Fe-based amorphous coating and its correlation with corrosion behaviour

Characterisation of three-dimensional porosity in an Fe-based amorphous coating and its correlation with corrosion behaviour

Effect of nanosilica type on protective properties of composite ceramic coatings deposited on steel 316L by sol–gel technique

Effects of Compressive Stress on Corrosion-Protective Quality and Its Maintenance under a Corrosive Environment for TiN Films Deposited by Reactive HCD Ion Plating

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