PROTECTING METAL SUBSTRATES USING SULPHIDES OF GROUPS VB, V1B, V11B, AND RARE EARTHS

摘要

ABSTRACTMetal substrates in corrosive environments, such asgas and oil pipelines, are normally prone toembrittlement caused by absorption of the hydrogen atomscathodically evolved during various corrosion proceses.This is substantially prevented by providing an activesubstance in the vicinity of the metal substrate, and inelectrical contact therewith, the active substance beinga sulphide or mixed sulphide of a metal of Group Vb, VIbor VIIb of the Periodic Table or of a rare earth metal,especially WS2 and MoS2.The active substance ispreferably applied as or in a coating on the surface ofthe substrate, with an overcoating of, for example, athermosetting resin, preferably being employed formechanical and environmental protection.