pH shifts and precipitation associated with metal ions in tissue culture

Bundy, K.J.; Kelly, Robert G.; Brown, Eric; Delahunty, C.M.

doi:10.1016/0142-9612(85)90069-9

Cited by 14 publications

(2 citation statements)

References 7 publications

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“…The mechanical and electrochemical properties of the implant materials determine the degree of fretting corrosion damage on the implant surface [55][56][57][58]. Explant studies of total hip replacements have reported that cobalt-chromium surface undergo a greater surface damage than the titanium surface in mixed materials modular implants.…”

Section: Introductionmentioning

confidence: 98%

Mechanical load assisted dissolution response of biomedical cobalt–chromium and titanium metallic alloys: Influence of in-plane stress and chemical environment

Ryu

Shrotriya

2015

Wear

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a b s t r a c tMechanical load-assisted dissolution is identified as one of the key mechanisms governing material removal in fretting and crevice corrosion of biomedical implants. In the current study, material removal on a stressed surface of cobalt-chromium-molybdenum (CoCr) and titanium (Ti-64) alloys subjected to single asperity contact is investigated in order to identify the influence of contact loads and in-plane stress state on surface damage mechanisms. The experiments were conducted in ambient as well as three different aqueous environments -phosphate buffered saline (PBS) at pH 7.4, PBS at pH 4.1 and high chloride solutions at pH 4.0. The tip of an atomic force microscope is used as a well-characterized "asperity" to apply controlled contact forces and mechanically stimulate the loaded specimen surface in different aqueous environments from passivating to corroding. The volume of the material removed is measured to determine the influence of contact loads, in-plane stresses and the environment on the material dissolution rate. Experimental results indicate that surface damage is initiated at all the contact loads studied and as expected in a wear situation, removal rate increases with increase in contact loads. For both alloys, removal rates display a complex dependence on residual stresses and the environment. In a passivating environment, the material removal rate is linearly dependent on the stress state such that surface damage is accelerated under compressive stresses and suppressed under tensile stresses. In a corrosive environment, the dissolution rate demonstrates a quadratic dependence on stress, with both compressive and tensile stresses accelerating material dissolution. The material removal rates are found to be consistently larger for CoCr in comparison to Ti64 surfaces under the same mechanical and electrochemical stimuli, despite the higher hardness of CoCr surfaces.

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Section: Introductionmentioning

confidence: 98%

Mechanical load assisted dissolution response of biomedical cobalt–chromium and titanium metallic alloys: Influence of in-plane stress and chemical environment

Ryu

Shrotriya

2015

Wear

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“…Fretting corrosion response of modular implants has been generally quantified through electrochemical measurements or measurement of weight loss during fretting testing [3,[10][11][12][13][14][15][16]. Results of the fretting corrosion studies indicate that there is a synergistic interaction of mechanical loading and electrochemical oxidation i.e., material degradation is accelerated by the combined effects of fretting and corrosion.…”

Section: Introductionmentioning

confidence: 99%

Onset of Surface Damage in Modular Orthopedic Implants: Influence of Normal Contact Loading and Stress-assisted Dissolution

2007

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Surface damage at interfaces of modular implants results from repeated fretting contacts between metallic surfaces in a corrosive environment. As a first step in understanding this complex process, multi-asperity contact experiments were conducted to characterize roughness evolution due to action of contact loads and exposure to a reactive environment. Cobalt-chromium specimens with surface roughness similar to modular implant were first subjected to only contact loading and subsequently, to alternating contact loads and exposure to reactive environment. During repeated normal contact loading, amplitude of surface roughness reached a steady value after decreasing during the first few cycles. However during the second phase surface roughness amplitude continuously evolveddecreasing during contact loading and increasing on exposure to corrosive environment. The increase in roughness amplitude during surface reaction depended on the magnitude of applied contact loads. A damage mechanism that incorporates contact-induced residual stress development and stress-assisted dissolution is proposed to elucidate the measured surface roughness evolution.

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Fretting Corrosion of Orthopedic Implants

Hallab

2011

Comprehensive Biomaterials

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pH shifts and precipitation associated with metal ions in tissue culture

Cited by 14 publications

References 7 publications

Mechanical load assisted dissolution response of biomedical cobalt–chromium and titanium metallic alloys: Influence of in-plane stress and chemical environment

Mechanical load assisted dissolution response of biomedical cobalt–chromium and titanium metallic alloys: Influence of in-plane stress and chemical environment

Onset of Surface Damage in Modular Orthopedic Implants: Influence of Normal Contact Loading and Stress-assisted Dissolution

Fretting Corrosion of Orthopedic Implants

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