Cobalt-Chromium Alloy Outermost Corrosion Resistance to Enhance

Update:23 Dec 2017

Due to the need for turbochargers for piston-aero engin […]

Due to the need for turbochargers for piston-aero engines, Co-based superalloys have been developed. In 1942, the United States first made turbocharger blades with the dental metal Vitallium (Co-27Cr-5Mo-0.5Ti). In the course of this alloy carbide phase precipitation continued to become brittle. Therefore, the alloy carbon content reduced to 0.3%, while adding 2.6% nickel, in order to improve the solubility of carbide forming elements in the matrix, thus evolving into a HA-21 alloy. In the late 1940s, the X-40 and HA-21 were used to make aircraft jet and turbocharger cast turbine blades and guide vanes that operated at temperatures of 850 to 870 ° C. The S-816, which was used as a forged turbine blade in 1953, is an alloy solid-solution strengthened with a variety of refractory elements.

Vacuum welding super grade silver tungsten alloy appearance of the outermost layer of the substrate to improve the corrosion resistance of a certain amount of help, but can not completely prevent erosion of the primer. Therefore, the primer itself good corrosion resistance is the key to maintaining the appearance of IXL. In the manganese metal, steel metal, nickel metal, lithium metal and other non-corrosion easily oxidized metal can not be directly welded IXL appearance, due to the metal base material is easy to corrosion, or outermost non-dense micro stomata, the outermost layer Impurities hard to wipe clean, the direct use of vacuum welding methods in the outermost layer of superficial IXL welding appearance, the Golden Bridge electrode does not prevent the primer for a long time to continue to be corroded, if not through oil seal and other special treatment, the appearance of easy to fall off.

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