Iron based alloy suitable for providing a hard and corrosion resistant coating on a substrate, article having a hard and corrosion resistant coating, and method for its manufacture

摘要

An iron-based alloy that is able to provide a coating on a substrate, the coating having high hardness, corrosion resistance and bonding strength to the substrate. The iron-based alloy consists of (by weight) 16.00 -20.00 ％ Cr; 0.20 -2.00 ％ B; 0.20 -4.00 ％Ni; 0.10 -0.35 ％ C; 0.10 -4.00 ％Mo; optionally 1.50 ％ or less Si, 1.00 ％ or less Mn, 3.90 ％ or less Nb, 3.90 ％ or less V,3.90 ％ or less W and 3.90 ％ or less Ti; the balance being Fe and unavoidable impurities; with the proviso that the total amount of Mo, Nb, V, W and Ti is in the range of 0.1 -4.0 ％ by weight of the alloy. It further relates to an article comprising a substrate and coating formed thereon, the coating being formed from the alloy, and to a method for forming a coated article. The method preferably employs HVOF, HVAF, cold spraying, plasma spraying, laser cladding or plasma transferred arc cladding.