INFLUENCE OF LUBRICANT COMPOSITIONS WITH ADDITIVES ON THE OPERABILITY OF GRAY-IRON VS GALVANIC CHROME COATING FRICTION PAIRS

We present the results of evaluations of the influence of lubricant compositions with various antifriction and antiwear additives on the operability of tribojunctions (gray-iron vs galvanic chrome coating (GI vs Cr)) in comparatively severe boundary friction conditions, reproducing the operating conditions of the engine cylinder/piston group: iron cylinder sleeve vs chrome-plated piston ring friction pairs. We analyze the obtained experimental relations, characterizing the operability of 30 tribojunction variants, from the viewpoint of the structure/energetic theory of the wearing of materials.