METHOD, PRODUCT AND ARRANGEMENT INVOLVING DESPOSITED CORROSION ENHANCING LAYERS

Method and arrangement for enhancing corrosion resistance of a fuel cell bipolar plate, "BPP", sheet (200) and such BPP sheet. The BPP sheet (200) has a core layer (202) made from a metal substrate material and having one or more first corrosion resistance enhancing layers (204) deposited thereon. It is deposited (302; 402) at least one second corrosion resistance enhancing layer (206) on said first corrosion enhancing layers (204). The second corrosion enhancing layer (206) having a SiOxCzHw composition and a thickness in a range 1-500 nm.