Method of monitoring wear failure process of surface modification part in liquid environmental medium

Abstract

The invention discloses a method of monitoring a wear failure process of a surface modification part in a liquid environmental medium. The method mainly comprises steps of A. putting the part in a serving liquid environmental medium and connecting the part to a working electrode port of an electrochemical workstation; B. connecting electrically an auxiliary electrode port of the electrochemical workstation to a graphite electrode or a platinum electrode; C. inserting a standard calomel electrode in the liquid environmental medium, and connecting the standard calomel electrode to a standard electrode port of the electrochemical workstation; and D. collecting in real time and drawing an open circuit potential changing curve by the electrochemical workstation in working while the part is serving actually; and after the curve reaches an intermediate potential stage, judging that the failure of the part begins when the potential reducing speed accelerates and the potential reduces to a preset threshold value, and taking the time as a failure node of the part. The method can monitor the wear failure process of the part in actual serving processes, and discover and judge in advance or timely the failure node of the part so as to avoid disastrous consequences caused by sudden failure of the part.

Description

technical field [0001] The invention relates to a method for monitoring the wear failure process of parts after surface modification treatment in liquid medium. Background technique [0002] With the development of high technology, the requirements for material properties are getting higher and higher, especially for widely used metal materials, higher requirements are put forward in terms of wear resistance, corrosion resistance and high temperature resistance, while pure metal materials It has been difficult to meet the increasingly stringent performance requirements. The preparation of high-performance modified layers or thin film materials on the surface of metal materials is the most realistic technical solution to solve the problems of non-wear resistance and easy corrosion of metal parts in engineering applications. At present, the surface modification of wear-resistant and anti-corrosion modified layers or various modified films (ceramic films such as nitrides, oxid...

AI Technical Summary

Problems solved by technology

These two methods evaluate the failure process of the film by monitoring the change of the friction coefficient during the friction and wear process of the part and observing the surface wear scar morphology of the part, but there are two problems in these two methods: 1. Sometimes the friction coefficient affects the surface change. The failure process of the permanent layer or film is not sensitive, that is, the failure of the surface modification layer or film does not necessarily lead to a significant change in the friction coefficient. For example, the friction coefficient of GCr15 modified by the titanium nitride film surface is about 0.5 , when the titanium nitride film fails, the friction coefficient of GCr15 is also about 0.5, and the film failure does not lead to the change of the friction coefficient

Therefore, it is not possible to accurately and reliably monitor the wear failure process of the film in real time by detecting the change of the friction coefficient.

2. The method of evaluating the failure process of the surface modification layer or film by monitoring the friction coefficient and wear scar morphology is mainly used for laboratory research, and is not suitable for evaluating the failure process of the surface modification layer and film of parts in actual service

[0004] In addition, for parts such as pumps, bearings and gears used in the solution medium environment, due to the lubricating effect of the solution medium, the influence of the change of the friction interface material on the friction coefficient during the friction process is weakened, and the friction coefficient and wear during the service process The morphology is more difficult to monitor, and it is impossible to monitor the failure process of the surface modification layer or the modified film by monitoring the change of the friction coefficient in real time

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