Porosity evaluation of protective coatings onto steel, through electrochemical techniques

Creus, J.; Mazille, H.; Idrissi, Hassane

doi:10.1016/s0257-8972(99)00659-3

Cited by 338 publications

(141 citation statements)

References 10 publications

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“…A disadvantage is that very small pores can be missed with this technique; it is also important to chose appropriate electrolyte (and indicator) composition and the duration of the test. Other electrochemical tests, such as Tafel extrapolation, cyclic voltammetry, linear polarization resistance and corrosion potential monitoring, are more quantitative and can be performed rapidly with standard electrochemical instrumentation [16][17][18]. Such techniques have been used to determine the percentage through-porosity in electroless nickel coatings on steel and aluminium substrates [19][20][21][22].…”

Section: Porosity Testsmentioning

confidence: 99%

“…The reader is referred elsewhere for studies of porosity using a.c. techniques such as electrochemical impedance spectroscopy [24][25][26]. EIS can provide a powerful tool for electrochemical measurements on metal coating integrity but presents the problem of interpretation of complex data.…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

“…Ahm et al [25] evaluated the porosity of WC-Cr 1 − x Al x N coatings on high speed steel using EIS. Creus et al [26] determined the porosity of 3-10 μm Al, Ti, TiN and CrN protective coatings on steel after 1 h immersion in 3% NaCl from the faradic capacity of the coated steel. However, the porosity measurements critically depended on the immersion time which determines the charge transfer resistance and can only be accurate if rapid dissolution of the substrate and accumulation of the corrosion products in the pores can be eliminated [25].…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

“…However, the porosity measurements critically depended on the immersion time which determines the charge transfer resistance and can only be accurate if rapid dissolution of the substrate and accumulation of the corrosion products in the pores can be eliminated [25]. Creus et al, [26] found that the porosity obtained from d.c. techniques such as polarization resistance, mixed potential theory and polarization curves and EIS were similar. They also suggested that sophisticated methods such as EIS could be avoided, in some cases, simple (direct current) polarisation resistance methods can give precise porosity values.…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

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Electrochemical characterisation of the porosity and corrosion resistance of electrochemically deposited metal coatings

Walsh

León

Kerr

et al. 2008

Surface and Coatings Technology

109

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Electrochemical techniques for the assessment of porosity in electrodeposited metal coatings are reviewed. The determination of porosity and corrosion, resistance is illustrated by electrochemical data from three coating/ substrate systems namely: electroless nickel on aluminium and steel and immersed gold coatings on an electroless copper-plated ABS polymer. Nickel coatings were up to 24 μm thick while gold deposits had thickness between 75 and 190 nm. Tafel extrapolation and linear polarisation resistance methods were used to determine the corrosion rate of the coated substrates. The aluminium samples were tested in 5% w/v (0.85 mol dm − 3 ) NaCl, while coated steel and ABS samples were immersed in 0.125 mol dm − 3 H 2 SO 4 and 0.1 mol dm − 3 NaBH 4 , respectively, at 295 K. Current vs. time curves and anodic polarisation behaviour have also been considered.

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Section: Porosity Testsmentioning

confidence: 99%

Section: Electrochemical Techniquesmentioning

confidence: 99%

Section: Electrochemical Techniquesmentioning

confidence: 99%

Section: Electrochemical Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical characterisation of the porosity and corrosion resistance of electrochemically deposited metal coatings

Walsh

León

Kerr

et al. 2008

Surface and Coatings Technology

109

View full text Add to dashboard Cite

show abstract

“…Adsorption of gas bubbles results in isolation of these locations from the plating bath and formation of coating defects [19][20][21]. In this study, a Cu interlayer was sandwiched by two Ni-P layers to block the holes in the coating.…”

Section: Introductionmentioning

confidence: 97%

Corrosion Resistance Of Electroless Ni-P/Cu/Ni-P Multilayer Coatings

Zhao

Zou

Hao

et al. 2015

Archives of Metallurgy and Materials

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coatings were prepared by deposition of Cu layer between two Ni-P layers. The Cu layer was deposited by metal displacement reaction between Cu 2+ and Fe atoms. Corrosion behavior of single-layer Ni-P coatings, double-layer Ni-P/Cu coatings, and three-layer Ni-P/Cu/Ni-P coatings were investigated by electrochemical tests in 3.5% NaCl solution. The three-layer coatings exhibited more positive E corr and decreased I corr compared with conventional single-layer Ni-P coatings, which indicated an improved corrosion resistance. The polarization curves of the three-layer coatings were characterized by two passive regions. The improved corrosion resistance was not only attributed to the function of the blocked pores of Cu. The Cu interlayer also acted as a sacrificial layer instead of a barrier in the coatings, which altered the corrosion mechanism and further improved the corrosion resistance of the coatings.Keywords: electroless plating, multilayer coatings, porosity, electrochemical tests, crystalline Cu layerWielowarstwowe powłoki Ni-P/Cu/Ni-P wytworzono metodą osadzania miedzi pomiędzy dwoma warstwami Ni-P. Warstwę Cu otrzymano dzięki reakcji wypierania metalu przez metal (dla miedzi i żelaza). Aby określić właściwości korozyjne jednowarstwowej powłoki Ni-P, dwuwarstwowej Ni-P/Cu oraz trójwarstwowej Ni-P/Cu/Ni-P przeprowadzono pomiary elektrochemiczne w 3,5% roztworze NaCl. Powłoki trójwarstwowe w porównaniu do jednowarstwowych wykazały się większą wartością E corr , przy malejącej wartości I corr . Wskazuje to na poprawę odporności na korozję. Krzywe polaryzacji dla powłok trójwarstwowych charakteryzują się występowaniem dwóch obszarów pasywacji. Poprawa odporności na korozję jest skutkiem nie tylko tzw. zjawiska blokowania porów w miedzi. Powłoka z Cu działała także jako warstwa protektorowa, modyfikując mechanizm korozji i poprawiając odporność korozyjną powłok.

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Application of Sol–Gel Method to Synthesize Organic–Inorganic Hybrid Coatings to Minimize Corrosion in Metallic Substrates

Figueira

Silva

2017

Hybrid Organic‐Inorganic Interfaces

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Porosity evaluation of protective coatings onto steel, through electrochemical techniques

Cited by 338 publications

References 10 publications

Electrochemical characterisation of the porosity and corrosion resistance of electrochemically deposited metal coatings

Electrochemical characterisation of the porosity and corrosion resistance of electrochemically deposited metal coatings

Corrosion Resistance Of Electroless Ni-P/Cu/Ni-P Multilayer Coatings

Application of Sol–Gel Method to Synthesize Organic–Inorganic Hybrid Coatings to Minimize Corrosion in Metallic Substrates

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