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Coating peeling and adhesion wear occurred on the surface of the cylinder wall polished piston ring

2020-08-24

Determining the following friction forms is of great significance for studying the friction characteristics of marine oils under low-sulfur fuel and low-load conditions, seeking solutions to reduce wear and prolonging the service life of engine components. The following forms of wear mainly occur In the mixed lubrication and boundary lubrication areas, by improving the ratio of additives, the anti-mechanical wear and anti-corrosive wear ability of the lubricant can be improved, and the service life of mechanical parts can be extended in actual operation.

From the analysis of the basic causes of wear, the "cylinder liner-piston ring" part of the marine engine includes the following four typical forms of wear:

(1) Fatigue wear is a phenomenon in which the friction surface produces large deformation and stress in the contact area, and forms cracks and is destroyed. Fatigue wear belongs to the friction loss of mechanical parts within the normal range;

(2) Abrasive wear is a phenomenon in which hard particles cause abrasions and shedding of surface materials on the surface of the friction pair in relative motion. Excessive abrasive wear will polish the engine cylinder wall and directly cause the lubricant to be difficult to form stable on the cylinder wall surface. Oil film, causing increased wear, aluminum and silicon in the fuel are the main causes of abrasive wear;

(3) Adhesive wear is caused by the increase in external pressure or the failure of the lubricating medium, the friction pair's surface "adhesive". Adhesive wear is a very serious type of wear that will cause the special material coating on the surface of the cylinder liner to peel off , Cause serious harm to the normal operation of the engine;

(4) Corrosion wear is the phenomenon of material loss caused by the chemical or electrochemical reaction between the surface material and the surrounding medium during the relative movement of the friction pair surface, and the material loss caused by mechanical action. In the case of severe corrosion and wear, the surface material of the cylinder wall will peel off, and even when the friction pair's surface is relatively moved, the surface coating will lose the original material characteristics and be severely damaged.