The effect of additives on wear behaviour of 45 steel in 100 ppm NaCl and 1N H_2SO_4 solutions were investigated and the mechanism about formation of protective film has been suggested. Several kinds of additives (K_2Cr_2O_7, SDBS, (CH_2)_6N_4, IMC-5) were used to reduce the corrosive wear losses. A pin-ring friction apparatus an high speed scratching device with electrochemical controlling system were designed, manufactured and used for research of steady and transient corrosive wear process. The dependence of friction coefficient and wear loss vs, potential, load and speed were measured respectively. The morphology of wear tracks were observed in SEM and determined by profilmeter. The potential vs. time was determined, for evaluating the reformation rat of passive film and the effect of additive on polarization curve was also measured for suggestion of mechanism. The experiment results show that appropriate additives could effectively reduce the corrosive wear losses. As a rule, the corrosive wear consists thee items: mechanical, chemical and their synergistic actions. In low speed and low load tribosystem, the removal of materials resulting from chemical or electrochemical reaction could be restrained by typical corrosive inhabitor, such as (CH_2)_6N_4 or K_2Cr_2O_7. The surfactants might decrease the friction coefficient in corrosive wear test due to their lubrication so that the weight loss related to mechanical shear stress should be controlled, especially in high speed and load condition. Because the corrosive resistance could not be improved by surfactant, it has been difined as a wear inhabitor, for example, SDBS in NaCl solution. The best result has been obtained by IMC-5 in 1N H_2SO_4, which as good inhabition both in corrosive medium and heavy wear duty.
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