Study Of Wear Behavior Of Stainless Steel Materials Under Hydrogen Peroxide Environment

H₂O₂(hydrogen peroxide) is a kind of ideal green propellant.In the new generation of non-toxic rocket propulsion systems,some moving parts(such as turbine engine pump bearings) and the sealing need to be operated under the strong H₂O₂ oxidizing environment.However,some parts of the hydrogen peroxide engine in the H₂O₂ medium are usually caused by excessive wear and premature failure occurs,which seriously limits the applications and development of H₂O₂ propulsion technology in the aerospace engine.Therefore,it is significant to study the mechanism of friction and wear behavior of materials under the hydrogen peroxide (H₂O₂) strong oxidizing environment.In this study,the stainless steel materials were chosen as the rubbing pairs to find out the the tribological properties under different testing conditions by carrying out the sliding wear experiments.The experiments were carried out on the pin-on-disc tester,where 1Cr18Ni9Ti and 2Cr13 stainless steel pins were against 45 steel discs.Different rotating speed,load and the medium concentrations were chosen in the testing.The orthogonal experiments were used to analyze the different tribological parameters and the characteristics of the worn surface of two kinds of materials under test conditions.The results showed that the testing factor on the effects of two materials were of different primary and secondary relationship.For the friction coefficient,1Cr18Ni9Ti,load＞speed,concentration;for 2Cr13,speed, concentration＞load;The effect of the friction coefficient of the speed and concentration changes did not show significant relationship between primary and secondary.For the wear volume,three testing factors did influence on the volume of 1Cr18Ni9Ti as follows:load＞speed＞concentration,but the influence of 2Cr13 followed by speed＞concentration＞load.Establishing platform on the pin-on-disc tester with the electrochemical test device,the tribological properties of two different stainless steel 1Cr18Ni9Ti and 2Cr13 were studied under the different concentrations of H₂O₂ environment.The relationship between the tribological properties and corrosion current density as wear progress had been explored as well.Friction coefficient and corrosion current density varied with the concentration of H₂O₂.The friction coefficient and corrosion current density of 2Cr13 stainless steel had similar evloution trend as the concentration of H₂O₂,which was not suitbale to the trend of the two parameters of 1Cr18Ni9Ti stainless steel.