Influence of the metal-plating additive “Valena” on wear of the spheroidal graphite cast iron microalloyed by Sn

Abstract

Wear of moulded spheroidal graphite cast iron alloyed by Sn is studied under conditions of boundary lubrication. The lubricant contains a metal-plating additive “Valena”. Five types of moulded spheroidal graphite cast iron specimens are studied with various wt. % Sn: without Sn (0 wt. % Sn), as well as with 0.018, 0.020, 0.032 and 0.051 wt. % Sn. Three types of lubricants are applied: lithium grease NLGI 3, motor oil SAE 15W-40 and transmission oil SAE 80W-90, in cases without and with 0.5 wt. % content of “Valena” metal-plating additive. The study is carried-out under conditions of constant load, sliding distance and velocity, using the pin-on-disk tribometer. Results of the influence of Sn content on the specimens wear are obtained for the various lubricant media.