Skip to Main content Skip to Navigation
New interface
Theses

Rôle de la force ionique, de l'albumine et du pH sur la dégradation par fretting-corrosion d'un contact acier inoxydable/PMMA. Application aux implants orthopédiques.

Abstract : In case of total hip joint cemented prosthesis, one of the most important causes of reintervention is the degradation induced by fretting-corrosion. The study of fretting-corrosion mechanism is conducted between a 316L stainless steel, the same material as the femoral stem, and a polymer PMMA, a model material for bone cement, in several solutions, more or less close to physiological liquid.First, the study was investigated at Open Circuit Potential (OCP), to be close to the in vivo conditions. The influence of chlorides and the role of albumin, the principal protein in the physiological liquid, on the 316L and its passive layer degradation are evaluated.To obtain some information on corrosion current, experiments are investigated at applied potential. The chosen potential is close to the value of the potential during fretting: E = -400 mV(SCE). Besides, this potential is a threshold potential for anodic and cathodic transition of current as a function of ionic strength. One of the key points is the role of albumin as a corrosion inhibitor in the degradation by fretting-corrosion.The 316L degradation by fretting-corrosion is a combination between corrosive wear, due to the physiological liquid which contains chlorides, and mechanical wear. There is a synergy term between corrosive and mechanical wears. The influence of ionic strength and albumin concentration on this synergy term is also quantified.The shape of the worn area in “W”, typical of fretting-corrosion, is due to a pH gradient and a corrosion mechanism close to crevice corrosion. A study where the global pH of the solution is fixed allows estimating values of pH in and at a short distance from the worn area.
Document type :
Theses
Complete list of metadata

Cited literature [211 references]  Display  Hide  Download

https://theses.hal.science/tel-00735400
Contributor : ABES STAR :  Contact
Submitted on : Tuesday, September 25, 2012 - 4:27:18 PM
Last modification on : Friday, October 23, 2020 - 4:37:53 PM
Long-term archiving on: : Friday, December 16, 2016 - 4:26:08 PM

File

pellier-julie-diff.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-00735400, version 1

Citation

Julie Pellier. Rôle de la force ionique, de l'albumine et du pH sur la dégradation par fretting-corrosion d'un contact acier inoxydable/PMMA. Application aux implants orthopédiques.. Autre. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2012. Français. ⟨NNT : 2012EMSE0641⟩. ⟨tel-00735400⟩

Share

Metrics

Record views

658

Files downloads

2660