Which Materials in a Turbomachinery Lubrication System Attract More Varnish — Chemistry, Metallurgy, and Surface Polarity In turbomachinery lubrication systems, varnish does not deposit randomly. It preferentially deposits on surfaces where the surface energy, polarity, temperature profile, flow regime, electrostatic condition, and metallurgy/oxide chemistry make the surface attractive to polar degradation products in the oil. This is why … Continue reading Which Materials in a Turbomachinery Lubrication System Attract More Varnish — Chemistry, Metallurgy, and Surface Polarity