Nickel-based alloy electrolytic polishing liquid and polishing method thereof

Abstract

The invention relates to nickel-based alloy electrolytic polishing liquid and a polishing method thereof and belongs to the technical field of electrolytic polishing. Aiming at solving the technical problems, the invention provides the nickel-based alloy electrolytic polishing liquid. The electrolytic polishing liquid is prepared from the following components in parts by weight: 50-75 parts of phosphoric acid, 8-15 parts of sulfuric acid, 1-5 parts of ammonium thiocyanate, 5-15 parts of 1,4-butynediol, 1-8 parts of dimethylglyoxime, 1-5 parts of polyethylene glycol and 1-3 parts of guar gum. According to the electrolytic polishing liquid, the components are common chemical materials, have low prices and are easy to obtain. A good electrolytic polishing effect is obtained after a nickel-based alloy workpiece is subjected to activation treatment, proper electrolyte and current density are utilized, and different electrolysis time and electrolyte temperatures are selected; the appearance of an electrolytic polished surface of the nickel-based alloy workpiece is good; the surface has obvious metal color and luster and the roughness can reach Ra0.1mum or below. The nickel-based alloy electrolytic polishing liquid has no problems of white points, spots, inter-crystalline corrosion and the like and the corrosion resisting performance of equipment is extremely improved.

Description

technical field [0001] The invention relates to a nickel-based alloy electrolytic polishing liquid and a polishing method thereof, belonging to the technical field of electrolytic polishing. Background technique [0002] Since the 1990s, nickel-based alloys, as a new material with excellent performance, have entered the field of nuclear power plant manufacturing in large quantities, such as steam generators, water tanks and other key equipment in nuclear islands. The important reason for using nickel-based alloys is that in addition to Nickel-based alloy has excellent high temperature resistance, it also has good corrosion resistance. The corrosion resistance is closely related to the surface state of the equipment. Compared with other polishing methods, electrolytic polishing is highly praised by the nuclear power plant design department and users because it can eliminate the residual stress near the surface and provide a small surface roughness. Equipment manufacturers ar...

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Problems solved by technology

The 6 Chinese invention patent "Hastelloy Electrolytic Polishing Process" proposes to use Isopol 140 as the electrolyte, and the parameters of the electrolytic polishing process are: temperature: 50-65°C, voltage: 8-12V, polishing time 60-120s, and titanium wire As the cathode, the area of ​​the plate is 1 / 3-1 / 5 of the area of ​​the part. Since the electrolyte is the key process material in electropolishing, and Isopol 140 is a code name, its specific composition cannot be determined, and the voltage is related to the workpiece, The geometric size, distance, and solution temperature of the cathode are all related, therefore, it is impossible to implement this patent to obtain a good electrolytic polishing surface for nickel-based alloys

Since the object of electrolytic polishing in this patent is the Ni5W alloy used as a coated superconductor multilayer structure metal substrate, the size is fixed and very small, which cannot be compared with the large equipment of nuclear power plants.

[0005] In other known information such as "Guangzhou Chemical Industry" in the third issue in 1996, there are technical methods for polishing nickel-based alloys using electrolytes such as perchloric acid, glacial acetic acid or phosphoric acid, tyrosine, sulfuric acid, glycerin, but these technical methods all exist Several defects, according to which nickel-based alloy products are electrolytically polished, and the ideal polished surface cannot be obtained after implementation

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