Nickel-based powder high-temperature alloy corrosion solution and corrosion method

Abstract

The invention provides a nickel-based powder high-temperature alloy corrosion solution and a corrosion method. The corrosion solution takes hydrochloric acid as a solvent, and solute components and concentrations are as follows: 60-80g / L sulfuric acid, 150-180 g / L of copper sulfate, and 80-100 ml / L of absolute ethyl alcohol, wherein the mass fraction of the adopted hydrochloric acid is 36%-38%, and the mass fraction of the sulfuric acid is 95%-98%. The corrosion method comprises the processes of incoming part inspection, oil removal, hot water cleaning, cold water washing, corrosion, flowing cold water washing, light transmission, flowing cold water washing, hot water washing, blow-drying, inspection and hydrogen removal. According to the corrosion solution and the corrosion method, the alloy surface appearance can be clearly displayed, various defects of the alloy surface can be analyzed and judged more conveniently, and meanwhile the problems that a corrosion layer is too deep and acorrosion product is difficult to remove are effectively solved.

Description

technical field [0001] The invention belongs to the field of surface treatment, in particular to a nickel-based powder superalloy corrosion solution and a corrosion method. Background technique [0002] Nickel-based powder superalloys refer to powder metallurgy superalloys with nickel as the matrix. Because of their high-temperature yield strength and good fatigue properties, they are widely used in high-temperature parts of aircraft engines. Among them, FGH97 nickel-based powder superalloy discs The measured properties of room temperature performance, high temperature tensile, high temperature durability, low cycle fatigue, and high temperature creep have reached or exceeded the standards of imported ЭП741НП powder, and are gradually applied to key components such as engine high-pressure turbine discs and grate discs. The surface of the disk needs to be inspected for corrosion before finishing to determine whether there are metallurgical defects such as visible holes or cra...

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Problems solved by technology

At present, hydrochloric acid with a volume of 8% to 12% and ferric chloride solution with a volume ratio of 82.5% are used for low-magnification corrosion, and sulfuric acid solutions with a concentration of 880g / l-920g / l are used for electrolytic low-magnification corrosion. The rate is generally too fast, and the corrosive atmosphere is extremely strong, which will not only cause damage to the operator, but also if the electrolytic corrosion is not well controlled, the solution will cause excessive corrosion, not only cannot observe a clear corrosion surface, interfere with the analysis and judgment, and seriously cause parts to be scrapped

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