Nickel-iron alloy plating solution of neodymium-iron-boron permanent magnet material and method for preparing plated nickel-iron alloy

Abstract

The invention provides a nickel-iron alloy plating solution of neodymium-iron-boron permanent magnet material and a method for preparing plated nickel-iron alloy. The method comprises chamfer polishing, degreasing, pickling dust removing, activating acid liquor and plated nickel-iron ally film-forming; and the nickel-iron alloy plating solution comprises 200-220g / L of nickel sulfate, 10-30g / L of six hydrated nickel chloride, 10-20g / L of ferrous sulfate, 30-50g / L of boric acid, 30-40g / L of sodium citrate, 2.5-3ml / L of NI-1305A, 10-12ml / L of NI-1305B and 0.2-0.4g / L of lauryl sodium sulfate. The method provided by the invention is not polluted by the iron in neodymium-iron-boron base materials; the binding force between the plated layer and the base body is increased; the nickel-iron alloy plating layer is soft and crystallized meticulously; the binding force between the plating layer and the base body is excellent; and the invention has excellent deeply plating and uniform plating capabilities.

Description

technical field [0001] The invention relates to a surface treatment method, in particular to a nickel-iron alloy plating solution for electroplating NdFeB permanent magnet materials and a method for preparing the electroplating nickel-iron alloy. Background technique [0002] NdFeB permanent magnet materials are sintered from rare earth neodymium, active metal iron and boron. The nature of iron and neodymium is very active, and it is easy to undergo redox reaction when it contacts with the plating solution. The traditional NdFeB electroplating is nickel plating or zinc plating. The disadvantage is that when electroplating nickel, since the potential of iron is negative than that of nickel, when the workpiece enters the solution, the iron in the matrix will undergo a substitution reaction with the nickel in the solution. Iron enters the solution, and the iron content in the solution increases to a certain extent, which will cause problems such as brittleness of the coating, ...

AI Technical Summary

Problems solved by technology

The nickel solution in this application is easily polluted by the dissolved iron, causing problems such as brittle plating and pinholes.

At the same time, this patent uses hydrochloric acid as an activator, and due to the etching effect of chloride ions, it is easy to cause powdering of the substrate and poor bonding of the coating.