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A new method for the investigation of tribocorrosion properties has been developed. The current density of a metal probe in an electrolyte under rubbing condition can be measured. The electrochemical microcell consists of a microcapillary (inner diameter 0.84 mm). The rubbing partner is an Al 2 O 3 tube, which rotates inside the microcapillary. Rotational speed, load and applied electrochemical...
The relationship between repassivation behavior and tribocorrosion is investigated using an iron-chromium alloy (AISI 430) in sulfuric acid as a model system. Tribocorrosion experiments were performed in a reciprocating motion apparatus under electrochemical polarization. A constant potential in the passive region was applied and the current variation during individual stroke periods was measured...
A round robin on tribo-electrochemical measurements was organised by the Tribology Committee of the CEFRACOR. Seven European laboratories participated in this round robin aimed at evaluating the reproducibility and comparability of experiments. The electrochemical and tribological behaviour of an Al 2 O 3 ceramic sliding against a 316L stainless steel was determined in sulphuric acid...
The wear of the cobalt-based hardfacing alloy Stellite grade 6, which is used for part of the latch arms of control rod drive mechanisms (CRDM) in pressurized water nuclear reactors, has been studied. The investigations were based on field experience (nondestructive inspection) and on metallurgical examinations of specimens from laboratory studies.A wear mechanism based on tribocorrosion was found...
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 Ti 6 Al 4 V.The deposition of graphite on Ti 6 Al 4 V samples is observed and...
Hard chromium coatings are frequently used for application where corrosion and wear degradation are combined, as an example in earthmovers, in mining transport systems or in moulds for plastics. The aim of this work is to study the mechanisms of tribocorrosion of hard chromium coated steel bars in a sodium chlorides solution under sliding wear. Using a self-made wear-corrosion apparatus, many parameters...
The tribocorrosion behaviour of a passive AISI430 ferritic stainless steel sliding against alumina in 0.5M sulphuric acid has been studied using a tribometer that allowed for electrochemical measurements. The effects of applied potential, normal load, sliding velocity, sliding distance and alumina roughness on the friction, wear volume and anodic current were determined. The obtained results are interpreted...
Tribocorrosion is an irreversible transformation of a material resulting from simultaneous physicochemical and mechanical surface interactions taking place in a tribological contact. Tribocorrosion involves numerous synergy effects between mechanical and chemical or electrochemical phenomena. In the present paper a general framework for the interpretation of electrochemically controlled tribocorrosion...
Tribocorrosion of stellite 6 in sulphuric acid was studied with a pin-on-disc tribometer through test conditions of intermittent friction. The occurrence of a mechanism involving mechanical depassivation during friction and further repassivation during the latency period between two successive friction steps was demonstrated. Polarization curves measurements and wear measurements by weight loss together...
The effect of displacement amplitude, normal force and tribometer stiffness on the tribocorrosion response of a Ti6Al4V alloy in contact with a smooth alumina ball was investigated using a fretting corrosion rig equipped with an electrochemical cell. The roughness of the alloy plates was 0.6μm, typical for the surface of hip joint stems. All experiments were carried out in 0.9wt.% NaCl under anodic...
A conventional scanning reference electrode technique (SRET) has been modified to provide a novel method for characterising the real-time localised tribocorrosion behaviour of uncoated and physical vapour deposition (PVD) coated samples. The modification was carried out based upon the principle of a ball-on-cylinder contact. Here a sliding probe, in this case a changeable alumina ball, is positioned...
The influence of the alkyl chain length and of the anion on the lubricating ability has been studied for the room-temperature ionic liquids (IL) 1-n-alkyl-3-methylimidazolium X − [X=PF 6 ; n=6 (L-P106). X=BF 4 ; n=2 (L102), 6 (L106), 8 (L108). X=CF 3 SO 3 ; n=2 (L-T102). X=(4-CH3C6H4SO3); n=2 (L-To102)]. Neat IL have been used for AISI 52100 steel-ASTM 2011...
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...
The effect of alumina nanoparticles suspended in an aqueous acetate buffer solution on the tribocorrosion behaviour of a 316L steel/alumina sliding contact was investigated using a reciprocating wear test rig equipped with an electrochemical cell. Through the addition of 10% volume of alumina nanoparticles to an acetate buffer solution it was possible to reduce the coefficient of friction by a factor...
Dental implants are used to replace teeth lost due to decay, trauma, or periodontal diseases. Dental implants are most of the times subjected to micro-movements at the implant/bone interface or implant/porcelain interface (due to the transmitted mastication loads) and chemical solicitations (oral environment). Such implant becomes part of a tribocorrosion system, which may undergo a complex degradation...
The dependence of the tribocorrosion of stainless steels AISI 304L and SS 3M ® orthodontic archwires sliding against corundum in a Ringer's solution on applied normal force, and sliding velocity, has been investigated using in situ electrochemical noise measurements. Applied normal force and sliding velocity were found to greatly affect current and potential during fretting-corrosion. An increase...
In the biomedical field, about 6% of the hip total prostheses must be replaced after 9 years. One of the main causes of the aseptic loosening may be attributed to fretting corrosion between the prosthesis and the bone cement. To understand this degradation, a fretting test between a stainless steel, 316L and PMMA has been used in Ringer solution. Fretting maps for the contact 316L/PMMA were determined...
Component wear can affect the ability of a component to fulfil its required function. For a designer or user, it is reasonable to expect wear to occur as soon as parts are in relative motion. It is less obvious to extend this possibility to motions with small or very small amplitudes and loads. However, it has to be admitted that such cases exist. It then becomes imperative to determine the wear mechanisms...
The effect of the applied potential on the deformation behaviour of a 316L stainless steel subject to tribocorrosion was investigated using a tribometer equipped with an electrochemical cell. Two potentials were compared: a cathodic potential where no oxide forms on the metal surface and a passive potential where a few nanometer thick oxide film forms. The wear, frictional and electrochemical response...
The paper presents the results of an investigation into the wear behaviour of gas nitrided austenitic steel in a corrosive liquid representing conditions appropriate to the manufacture of soft drinks. The layers were obtained by low temperature (400 and 450°C) gas nitriding and were predominantly composed of a phase known as expanded austenite. Non-treated austenitic stainless steel was used as a...
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