Tribological and corrosion wear of graphite ring against Ti6Al4V disk in artificial sea water

Severe degradations result from the friction of two antagonists in sea water environment. It is proposed to evaluate materials resistance to wear with a tribocorrosion experimental set-up which is mechanically and electrochemically instrumented. The method is illustrated with graphite and Ti6Al4V.The deposition of graphite on Ti6Al4V samples is observed and modifies the contact characteristics. Processes of graphite wear due to mechanical effect are characterised. Observations clearly indicate that Ti6Al4V degradations depend on the electrochemical potential imposed and more precisely on the electrochemical conditions in the contact zone

Evolution des propriétés tribocorrosives du 316L dans un milieu Nacl

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Modelisation d un contact plan/plan entre un graphite et du Ti6Al4V renforce TiC : essai de tribocorrosion anneau/disque, analyse de l usure des materiaux

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Tribological and corrosion behaviours of graphite and titanium alloys couple during ring-on-disk tests

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Tribological and corrosion experiments of graphite ring against Ti-6Al-4V disk: Influence of electrochemical and mechanical parameters

Friction of two materials in artificial seawater induces severe degradations of both antagonists. In view of evaluating materials wear resistance, this investigation is devoted to the development of a new ring-on-disk tribocorrosimeter device. Its relevance to the study of wear due to plan/plan friction is analyzed comparing it to classical pin-on-disk experiments, with special emphasis on the influence of several factors: choice and respective position of both materials in contact, applied load, test duration

Tribocorrosion d'un acier inoxydable en milieu marin artificiel

The friction and wear of stainless steels in sea-water environment is of prime interest for naval applications. The behaviour of the tribosystem alumina pin / 316L stainless steel disc in a 30g/l NaCl solution buffered at pH 8 exhibited the coupling between mechanical and electrochemical parameters. One objective of this study is to determine methods for the comprehension and interpretation of tribocorrosion tests.The friction coefficient is quite sensitive to the applied potential and it is particularly true around the free potential under friction. In our experimental conditions, sliding friction shifts the value of the free potential towards more cathodic value. This behaviour shows the sensibility of potential to frictional perturbation of the surface. In passive domain of materials, an increase of intensity is observed under friction. This evolution is due to depassivation / repassivation phenomena. The overall wear volume shows a dependence to the applied normal load and to the imposed electrochemical potential. Except for the beginning of the test, the evolution of wear is linear in time during a 5 hours test.The total wear, addition of mechanical and electrochemical wear, is investigated and an explanation of its global behaviour is proposed on the basis of an electrochemical and mechanical framework. This eroded volume can be principally attributed to corrosive mechanisms. A mechanical modelling related to evaluation of elasto-plastic pressure distribution is proposed and gives the stabilised wear regime. The experimental wear regime is in agreement with this model.The simplicity of this tribocorrosion system allows an automatic analysis and interpretation of tests results. Interactions between electrochemical and mechanical behaviour are studied. We can explain the mechanical wear by study of contact problem and electrochemical wear by analysis with Faraday law. Despite the great complexity of industrial problems (wear and corrosion of two antagonists,...), this method could be adapted to interpret various tribotest systems

Wear modelling of contact plan/plan between graphite and titanium alloy

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