Patent ID: 8663819

Claim:
An article comprising: (i) a substrate material comprising a substrate based on Fe and alloys thereof; and (ii) an electrodeposited metallic layer or patch on at least part of said substrate material or on an intermediate structure, said metallic layer or patch comprising cobalt between 95 and 99% per weight and phosphorus in the range between 1 and 5% per weight, wherein said metallic layer or patch has a microstructure which is fine-grained with an average grain size between 2 and 5,000 nm and/or amorphous, and wherein said metallic layer or patch exhibits a tensile or compressive internal stress between 2.5 and 30 ksi, and has a thickness between 10 micron and 2.5 millimeter and porosity in the range of 0 and 1.5%, wherein said article is with or without an intermediate structure between said substrate material and the electrodeposited metallic layer or patch with a layer thickness of less than 5 microns, said intermediate structure comprising at least one strike layer selected from the group consisting of Co, Ag, Ni, Zn, Sn, and Cu, and wherein said article comprising the substrate material and either the electrodeposited metallic layer or patch comprising cobalt and phosphorus or the electrodeposited metallic layer or patch comprising cobalt and phosphorus with the intermediate structure exhibits an axial fatigue and/or rotating beam fatigue life cycle number equivalent to or exceeding the one of either an uncoated substrate material or equivalent thickness engineering hard chromium coated substrate material when tested at an applied stress of between ⅓ and ⅔ of the yield strength of said uncoated substrate material.