Substrate roughness, deposit thickness and the corrosion of electroless nickel coatings

Tomlinson, W. J.; Carroll, M. W.

doi:10.1007/bf00580115

Cited by 23 publications

(10 citation statements)

References 6 publications

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“…Grinding produces a thin (about 1.0 lm), hard, white layer, on the machined surface which is in residual compression (about 600 MPa) and resists corrosion. Tomlinson et al [23] suggested that the white layer on the ground specimen is the cause of decreasing in the corrosion current that might have been expected on the basis of the roughness. Increasing pH accelerates deposition rate and causes improvement in the surfactant effect and microstructure became finer, but in the presence of surfactant the effect of pH on corrosion rate cannot be evaluated.…”

Section: Potentiodynamic Polarization Studiesmentioning

confidence: 98%

Corrosion performance of the electroless Ni–P coatings prepared in different conditions and optimized by the Taguchi method

Farzaneh

Ehteshamzadeh

Mohammadi³

2010

J Appl Electrochem

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This paper presents an experimental study on the influence of anionic surfactant sodium dodecyl sulfate (SDS), pH, substrate finishing and annealing temperature on the corrosion resistance of electroless nickel phosphorus (Ni-P) coatings using electrochemical techniques and optimization of process parameters based on the Taguchi method. Parameters were selected in three levels and L9 from orthogonal robust array design was used. Corrosion performance of the electroless Ni-P coatings was evaluated by polarization and electrochemical impedance spectroscopy (EIS). Scanning electron microscope (SEM), Energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis were used for studying surface morphology and chemical composition of the electroless Ni-P coatings. The results showed that SDS surfactant causes increasing of corrosion resistance and improves surface morphology. Finally, optimum conditions were achieved as, surfactant concentration: 1.5 g L -1 , pH: 5.5, substrate finishing provided with emery paper no, 2000, and annealing temperature of 200°C.

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Section: Potentiodynamic Polarization Studiesmentioning

confidence: 98%

Corrosion performance of the electroless Ni–P coatings prepared in different conditions and optimized by the Taguchi method

Farzaneh

Ehteshamzadeh

Mohammadi³

2010

J Appl Electrochem

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“…The white layer on the ground specimen is the cause of the corrosion current decreasing, which might have been expected on the basis of the roughness. 21,22 But the substrate roughness is not effective parameter on microhardness properties of EN coatings. Therefore, this parameter is not effective parameter in the Taguchi analyzing.…”

Section: Microhardness Of Electroless Eni-p Depositsmentioning

confidence: 98%

Investigation and optimization of SDS and key parameters effect on the nickel electroless coatings properties by Taguchi method

et al. 2010

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In this research, the influence of anionic surfactant sodium dodecyl sulfate (SDS), pH, substrate finishing, and annealing temperature on the surface morphology and hardness of the electroless nickel phosphorus (ENi-P) coatings were studied. Taguchi's experimental design method was used. Parameters selected in three levels and L9 from orthogonal robust array design were employed. Surface roughnesses of the deposits were measured using a stylus instrument. Scanning electron microscope and x-ray diffraction analysis were implemented to study surface morphologies and phase composition, respectively. Microhardness of the ENi-P deposits was measured using a microhardness tester at three trials per sample. The results showed that addition of the SDS increases the microhardness and improves surface morphology. Finally, optimum condition was achieved as, surfactant concentration equal to 1.5 g/L, pH 5.5, substrate finishing provided with emery paper no. 2000, and annealing temperature equal to 400°C.

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“…The corrosion resistance of the electroless N~P coatings depends on several factors, namely the phosphorus content [6], degree of crystallinity, size and orientation of the grains [7], phase and structural variation and the thickness and porosity [8]. It has been established that various chemical states of Ni and P, enriched in the surface film, are responsible for the passivation process [9].…”

Section: Introductionmentioning

confidence: 99%

The effect of microstructure on the corrosion behaviour of electroless NiP alloys in acidic media

Mimani

Mayanna

1996

Surface and Coatings Technology

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Substrate roughness, deposit thickness and the corrosion of electroless nickel coatings

Cited by 23 publications

References 6 publications

Corrosion performance of the electroless Ni–P coatings prepared in different conditions and optimized by the Taguchi method

Corrosion performance of the electroless Ni–P coatings prepared in different conditions and optimized by the Taguchi method

Investigation and optimization of SDS and key parameters effect on the nickel electroless coatings properties by Taguchi method

The effect of microstructure on the corrosion behaviour of electroless NiP alloys in acidic media

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