IHI Ionbond: Coatings for Bipolar Plates IHI Ionbond AG (subsidiary of IHI Group) is a company specializing in coating solutions using PVD, CVD and PACVD technologies. This company profile focuses on Ionbond's coatings for bipolar plates used in PEMELs and PEMFCs. IHI Ionbond: Coatings for Bipolar Plates