text: It is known that aluminum improves the sulfidation resistance of iron alloys.
  The sulfidation of tungsten is a multiple step process. The first step is an oxidation reaction, converting the tungsten to a tungsten bronze on the surface of the object.  The tungsten bronze coating is then converted to a sulfide.
  One commonly encountered occurrence of sulfidation in manufacturing environments involves the sulfidic corrosion of metal piping.  The increased resistance to corrosion found in stainless steel is attributed to a layer of chromium oxide that forms due to oxidation of the chromium found in the alloy.
  The process of liquid sulfidation has also been used in the manufacturing of diamond-like carbon films. These films are generally used to coat surfaces to reduce the wear due to friction. The inclusion of sulfidation in the process has been shown to reduce the friction coefficient of the diamond-like carbon film.