Valves including surface coatings

A valve comprising a valve body comprising an inlet port and outlet port fluidically coupled the inlet port through an internal fluid passage, wherein the valve comprises an actuator configured to permit or block flow of fluid between the inlet port and the outlet port valve by blocking or opening the internal fluid passage, wherein at least one surface of the inlet port, the outlet port or the actuator comprises a coated surface, wherein the coated surface comprises a surface coating, and wherein the surface coating comprises an alloy layer comprising (i) molybdenum or tungsten and (ii) at least one element selected from the group consisting of nickel, cobalt, chromium, tin, phosphorous, iron, magnesium and boron or at least one compound comprising one or more of nickel, cobalt, chromium, tin, phosphorous, iron, magnesium or boron.