Abstract
Rosin derivatives used as coatings on a variety of substrates provide electrical insulation and corrosion protection. This paper explores the feasibility of using two chemically modified rosins, which are the glycerol rosin ester (GRE) and GRE-poly(methyl methacrylate) (GRE-PMMA) used as stainless steel coatings to reduce friction and wear rate. The chemical structures of GRE and GRE-PMMA are investigated via FTIR to evaluate frictions and wear characteristics of coated stainless steel-substrates; these are tested on a ball-on-disc tribometer, followed by a careful observation of the obtained surface using an optical microscope. The FTIR results reveal structural differences among rosin, GRE, and PMMA; which relates to the suppression of –COOH groups and the appearance of new –OH and –COOR groups. The GRE and GRE-PMMA coatings on the substrate, reduce the friction coefficient by 49% and 46% (before coating 0.59 and after coating 0.30 and 0.32) and wear rate by 29% and 26% (before coating 6.8 and after coating 4.8 and 5.0) respectively. These findings suggest that GRE and GRE-PMMA are effective coatings as protective agents for stainless-steel substrates due to the attractive forces between the organic molecule and the metal surface.
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