SU991258A1 - Plant for investigating end friction pair corrosion mechanical wear - Google Patents

Description

The invention relates to research tools tribological properties of materials operating in conditions of corrosion-mechanical wear.

A known installation for the study of corrosion-mechanical wear of mechanical friction pairs, comprising a housing, coaxially mounted two sample holders, end surfaces of which are designed to fix test specimens made in the form of cylindrical rings, a rotation drive kinematically connected to one specimen holder, a loading mechanism interacting with another holder, a friction moment meter, a chamber designed to fill it with a working fluid, located inside the latter spomogatelny electrode, and an electrolyte key reference electrode in electrical communication with the electrolytic key, and instrumentation ζΐ ^ ·

In a known installation, the camera covers the friction unit and is connected to the surrounding atmosphere. This does not allow the study of friction pairs at high pressures of the working fluid and limits the temperature regime of the tests.

The purpose of the invention is the expansion of the functionality of the installation.

This goal is achieved by the fact that in the installation for the study of corrosion-mechanical wear of mechanical friction pairs, comprising a housing, two sample holders installed in it coaxially, the mechanical surfaces of which are designed to fix the test specimens made in the form of cylindrical rings, a rotation drive kinematically connected with one sample holder, a loading mechanism that interacts with another holder, a friction moment meter, a chamber designed to fill it with a working fluid, aspolozhennye inside the last auxiliary electrode and the electrolytic key, the reference electrode is electrically connected with the electrolytic key, and instrumentation, the chamber is formed as a closed cavity formed by end surfaces sample holders and the inner cylindrical surfaces of the samples, and the electrolytic key is filled with a porous material impregnated with electrolyte.

The drawing shows a schematic diagram of the installation.

The installation comprises a housing 1, in which two sample holders 2 and 3 are coaxially mounted, on the end surfaces of which the studied samples 4 and 5 are made, made in the form of cylindrical rings. The holder is installed in the housing 1 with possible. rotation in bearings 6 and 7 and kinematically connected with a rotation drive (not shown). . The holder 3 is mounted in the housing 1 with the possibility of rotation on the thrust bearing 8 and through the running sleeve 9 interacts with the loading mechanism 10. By means of the lever 11, the holder interacts with the friction moment meter 12. A closed cavity / formed by the end surfaces of the holders 2 and 3 and the inner cylindrical surfaces of the samples 4 and 5> forms a chamber 13, which is designed to fill it with a working fluid. An auxiliary plastic electrode 14 and an electrolytic key 15, which is a capillary filled with porous material impregnated with an electrolyte, are placed inside the chamber 13, so that it turns out to be electrically connected to the comparison electrode 16) installed outside the chamber 13. The comparison electrode 16, the auxiliary electrodes 14 and sample 5 connected to a potentiostat 17. In holders 2 and 3, annular cavities 18 and 19 are made, through which a coolant is pumped, which makes it possible to regulate the temperature regime of test samples 4 and 5.

The chamber 13 is connected by piping 20 to the reservoir of the working fluid. A rubber casing 21 is installed on the holder 3, designed to collect the working fluid seeping through the flat end joint of samples 4 and

Installation at once.

Samples 4 residents 2 and 3 with the power of the loading mechanism 10 load them with compressive force. Liquid is pumped into the chamber 13 formed during this process, the drive is turned on, and samples 4 and 5 are tested for wear, while measuring friction along their end surfaces using a friction moment meter 12. The temperature regime of friction is maintained with the help of a coolant circulating in cavities 18 and 19. Electrochemical studies of corroeion-me

5.

works as follows ob50 and 5 are installed in the squad accordingly. From the mechanical wear of samples 4 and 5, they are carried out in potentiostatic and potentiodynamic modes, measuring potentials and currents using an auxiliary electrode 14, a reference electrode 16 and a working electrode, which is sample 5. By filling the electrolyte key 15 with a porous material impregnated with an electrolyte, the latter even at high pressures inside the chamber 13 is not squeezed out of the capillary. The leakage of the working fluid through the junction of samples 4 and 5 is determined by its .. volume, which accumulates in the rubber casing 21.

The installation for studying the corrosion-mechanical wear of materials allows conducting electrochemical studies under conditions as close to real as possible, increasing the accuracy and reliability of the test results, and developing electrochemical methods for regulating the processes of friction and wear.

Claims (1)

the electrolytic key is filled with a poristable material impregnated with electrolyte. The drawing shows the principal on the installation diagram. The installation comprises a housing 1, in which two holders of l 2 and 3 samples are coaxially mounted, on the end surfaces of which the studied samples 4 and 5 are fixed, made in the form of cylindrical rings. A holder 2 is mounted in housing 1 with rotational possibilities in bearings 6 and 7 and is kinematically connected with a rotational drive (e shown). The holder is mounted in housing 1 rotatably on a thrust bearing 8 and through a running sleeve 9 interacts with mechanism 10 loading. Through the lever 11, the holder 3 interacts with the friction torque meter 12. A closed cavity / formed by the end surfaces of the holders 2 and 3 and the internal cylindrical surfaces of samples 4 and 5 forms a chamber 13, which is designed to be filled with the working fluid. Inside the chamber 13 is placed an auxiliary plastic electrode 14 and an electrolytic key 15, which is a capillary filled with a porous material impregnated with electrolyte, which makes it electrically connected to a reference electrode 16 mounted outside the chamber 13. A comparison electrode 16, an auxiliary electrolyte 14 and Sample 5 is connected to a potentiostat 17. In holders 2 and 3, annular cavities 18 and 19 are made through which they are pumped from the coolant, allowing the temperature of the test to be controlled. s 4 and 5. The chamber 13 is connected to piping 20 to the reservoir of working liquid. The holder 3 is fitted with a rubber casing 21 designed to collect the working fluid leaking through the flat end joint of samples 4 and 5. The installation works as follows. Samples 4 and 5 are installed in holders 2 and 3, respectively. By means of the mechanism 10, the loads are loaded with a compressive force. The liquid 13 formed in the chamber 13 is injected, the actuator is switched on and samples 4 and 5 are tested on the nose, while measuring friction on their face surfaces using a friction torque meter 12. The frictional temperature regime is maintained by a heat transfer fluid circulating in cavities 18 and 19. Electrochemical studies of corrosion-mechanical wear of samples 4 and 5 are carried out in potentiostatic and potentiodynamic regimes, and potentials and currents are measured using a booster electrode 14, a comparison electrode 16 and a working electrode which is sample 5. Due to the filling of the electrolytic key 15 with a porous material impregnated with electrolyte, the latter, even at high pressures inside chamber 13, does not ydavlivaets of the capillary. The leakage of working fluid through the junction of samples 4 and 5 is determined by the volume that accumulates in the rubber casing 21. An installation for studying corrosion-mechanical wear of materials allows for electrochemical studies under conditions that are as close to real as possible, increasing the accuracy and reliability of test results , to develop electrochemical methods for regulating the processes of friction and wear. Claims An installation for the study of corrosion-mechanical wear of friction end pairs, comprising a housing, two sample holders mounted coaxially therein, the end surfaces of which are designed to fix test specimens made in the form of cylindrical rings, a rotation drive kinematically associated with one sample holder, load mechanism interacting with another holder, friction torque meter, camera designed. for filling it with a working fluid, an auxiliary electrode and an electrolytic key located inside the latter, a reference electrode electrically connected to the electrolytic key, and measuring equipment, characterized in that, in order to extend the functionality, the chamber is made in the form of a closed cavity formed by end faces surfaces of sample holders and internal cylindrical surfaces of samples, and the electrolytic key is filled with a porous material impregnated with electrolyte. Sources of information taken into account in the examination 1. G. Lazarev. and others. Features of friction and wear materials in the aggressive range. - Friction and wear, Vol.2, 1981, 1, p. 43 (prototype).