Metal based nano composite electric plating method for Nd-Fe-B material antisepsis

Abstract

The invention discloses a metal based nanometer composite plating method of corrosion resistance Nd-Fe-B material, which is characterized by the following: removing oil for Nd-Fe-B working piece through ultrasound; brightening through dilute HNO3 solution; bleaching through clear water; placing in the composite nanometer plating groove to plate semi-light nickel; stripping film through electrolyzing; proceeding bright plating.

Description

technical field [0001] The invention belongs to the technical field of chemical surface treatment, and in particular relates to a nanocomposite electroplating method using metals such as nickel, zinc, copper, and nickel-cobalt alloys, nickel-iron alloys, and nickel-phosphorus alloys as metal bases. Background technique [0002] Neodymium in Nd-Fe-B permanent magnets is a rare earth element with strong chemical activity. It is easily oxidized in the air and has poor corrosion resistance. In particular, Nd-Fe-B magnets have neodymium-rich phases, which are prone to intergranular Corrosion, when it is serious, a large amount of neodymium oxides and hydrides are formed to pulverize the material; secondly, most of these magnetic materials are prepared by sintering method, the surface is porous, brittle and loose in structure, so this kind of material must be specially treated Surface anti-corrosion treatment. [0003] So far, for the surface treatment method of Nd-Fe-B permanent...

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Problems solved by technology

[0002] Neodymium in Nd-Fe-B permanent magnets is a rare earth element with strong chemical activity. It is easily oxidized in the air and has poor corrosion resistance. In particular, Nd-Fe-B magnets have neodymium-rich phases, which are prone to intergranular Corrosion, when it is serious, a large amount of neodymium oxides and hydrides are formed to pulverize the material; secondly, most of these magnetic materials are prepared by sintering method, the surface is porous, brittle and loose in structure, so this kind of material must be specially treated Surface anti-corrosion treatment

[0003] So far, for the surface treatment method of Nd-Fe-B permanent magnet, the material is firstly sealed to avoid the residue of acid, alkali and plating solution in the matrix during degreasing, light emitting and subsequent electroplating process, thus Avoid internal corrosion of the substrate, but the effect of this method is not very obvious, and it adds multiple follow-up processes, which affects work efficiency

Subsequent electroplating still adopts the conventional nickel-copper-nickel or galvanizing process, and the thickness of the entire coating is at least 20um; Nearly 4 hours (such as the most commonly used barrel nickel-copper-nickel process), but also caused a greater impact on the environment (zinc passivation requires hexavalent chromium)

Electroless Ni-P alloy plating has the disadvantages of short service life, high price and large amount of sewage treatment.