Effect of different surface finishing and of hydroxyapatite coatings on passive and corrosion current of Ti6Al4V alloy in simulated physiological solution

Cabrini, Marina; Cigada, A.; Rondelli, G.; Vicentini, B.

doi:10.1016/s0142-9612(96)00205-0

Cited by 93 publications

(51 citation statements)

References 8 publications

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“…The same effect was also observed for the effect of roughness on corrosion rate for AE44 Mg alloy before [7]. In both cases the metal has no ability to form a passive layer but in the case of other metals which form a passive layer, a reverse trend was observed [1][2][3][4][5][6]. As it is shown in Figure 1, polarization curves rise to parallel and it is clear that both cathodic and anodic branches show a lower current density indicating that the hydrogen evolution reaction is activation controlled [10,11].…”

Section: Potentiodynamic Polarization Techniquesupporting

confidence: 73%

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Simultaneous effect of surface roughness and passivity on corrosion resistance of metals

Toloei

Stoilov

Northwood

2015

Materials Characterisation VII

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Unidirectional surface roughness of varying magnitudes were created on both nickel and mild steel by grinding on SiC papers with grit sizes from G60 (roughest) to G1200 (smoothest) and the corrosion resistance in 0.5M H 2 SO 4 solution was determined using a potentiodynamic polarization technique. A different trend of corrosion rate versus roughness was seen for the active-passive metal (nickel) and non-active-passive metal (mild steel). For nickel there was an increase in corrosion rate with increasing roughness, whereas for mild steel the corrosion rate decreased with increasing surface roughness. Furthermore, through a detailed examination of the surface before and after corrosion using techniques including profilometry, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), it was established that different corrosion mechanisms were operative for nickel and mild steel. For both metals, the smaller grit sizes produced a rougher surface with wider and deeper grooves. In the case of nickel, the higher roughness provided a greater contact area between the corrosive medium and metal and there was trapping of the corrosive ions in the deep grooves. Both of these factors would lead to an increase in corrosion rate. Also, for the smoother nickel surfaces, it is easier to form a stable passive film. For mild steel, which does not form a passive film, corrosion rates are generally much higher than for nickel. For the rougher surfaces with the deeper grooves, the corrosion product, FeSO4, can fill the grooves thereby acting as a barrier to further ingress of the corrosive ions to the un-corroded metal.

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Section: Potentiodynamic Polarization Techniquesupporting

confidence: 73%

“…Such a trend was observed for copper, nickel, aluminium, stainless steel, magnesium and titanium alloys [1][2][3][4][5][6]. In all cases the effect of creating different roughnesses were investigated on both localized and general corrosion performance of the alloys.…”

Section: Introductionmentioning

confidence: 92%

Simultaneous effect of surface roughness and passivity on corrosion resistance of metals

Toloei

Stoilov

Northwood

2015

Materials Characterisation VII

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“…A variety of methods, such as anodization, sol-gel process and thermal oxidation, have been applied and have shown improved corrosion resistance of Ti and enhanced biological properties [7,8]. Moreover, TiO2 coatings have been reported to improve the biocompatibility of Ti by allowing the formation of an O-H bond in TiO2 under moist conditions [9].…”

Section: Introductionmentioning

confidence: 99%

Initial responses of human osteoblasts to sol–gel modified titanium with hydroxyapatite and titania composition

et al. 2006

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“…In most metals and their alloys, the general trend is that a higher surface roughness results in higher corrosion rate. Such trend was observed for copper, nickel, aluminium, stainless steel, magnesium and titanium alloys [1][2][3][4][5][6]. Zuo et al [7] investigated the metastable pitting behaviour of 316L stainless steel with various degrees of surface roughness and showed that, as surface roughness increased, the nucleation rate of metastable pits as well as the overall corrosion rate increased.…”

Section: Introductionmentioning

confidence: 93%

Simultaneous effect of surface roughness and passivity on corrosion resistance of metals

Toloei

Stoilov

Northwood

2017

WIT Transactions on State-of-the-Art in Science and Engineering

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Unidirectional surface roughness of varying magnitudes was created on both nickel and mild steel by grinding on SiC papers with grit sizes from G60 (roughest) to G1200 (smoothest) and the corrosion resistance in 0.5 M H 2 SO 4 solution was determined using a potentiodynamic polarization technique. A different trend of corrosion rate versus roughness was seen for the active-passive metal (nickel) and non-active-passive metal (mild steel). For nickel, there was an increase in corrosion rate with increasing roughness, whereas for mild steel the corrosion rate decreased with increasing surface roughness. Furthermore, through a detailed examination of the surface before and after corrosion using techniques including profilometry, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), it was established that different corrosion mechanisms were operative for nickel and mild steel. In the case of nickel, the higher roughness provided a greater contact area between the corrosive medium and metal and there was trapping of the corrosive ions in the deep grooves. Both of these factors would lead to an increase in corrosion rate. Also, for the smoother nickel surfaces, it is easier to form a stable passive film. For mild steel, which does not form a passive film, corrosion rates are generally much higher than for nickel. For the rougher surfaces with the deeper grooves, the corrosion product, FeSO4, can fill the grooves thereby acting as a barrier to further ingress of the corrosive ions to the un-corroded metal.

show abstract

Effect of different surface finishing and of hydroxyapatite coatings on passive and corrosion current of Ti6Al4V alloy in simulated physiological solution

Cited by 93 publications

References 8 publications

Simultaneous effect of surface roughness and passivity on corrosion resistance of metals

Simultaneous effect of surface roughness and passivity on corrosion resistance of metals

Initial responses of human osteoblasts to sol–gel modified titanium with hydroxyapatite and titania composition

Simultaneous effect of surface roughness and passivity on corrosion resistance of metals

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