Nickel sealing and plating solution and nickel sealing plating process

Abstract

The invention discloses a nickel sealing and plating solution and a nickel sealing plating process. The nickel sealing and plating solution comprises a Watt nickel plating solution and a ferrocyanide solution, wherein the Watt nickel plating solution comprises 280-350 g / L of nickel sulfate NiSO4-6H2O, 45-75 g / L of nickel chloride NiCl2-6H2O, 40-50 g / L of boric acid H3BO3 and 0.2-2 g / L of ferrocyanide solution. 0.2-2 g / L of the ferrocyanide is added into a plating solution of ordinary plating bright nickel, ferrocyanide solid is formed in the nickel plating solution and precipitated, the ferrocyanide solid is stirred evenly to be dispersed through the air, a nickel sealing layer with non-conductive solid particles is formed under the plating action, and the nickel sealing layer is subjected to chromium plating to form microporous chromium. According to the nickel sealing and plating solution and the nickel sealing plating process, the nickel sealing process can be applied in various conventional bright nickel or nickel sealing processes, and no carrier or special additive is needed. Solid particles are produced by a chemical reaction, and solids of aluminum oxide, silicon oxide and the like are not needed, so that particle agglomeration phenomenon is avoided during usage.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a nickel sealing plating solution and a nickel sealing electroplating process suitable for multilayer nickel plating and chromium plating. Background technique [0002] Since the pores or cracks of the ordinary chromium layer are large and few, and it is impossible to have uneven discontinuous points, the acid rain in the industrial atmosphere and the salt in the humid air along the coast are likely to be in the cracks or small holes of the chromium layer in the nickel layer. Constitutes very small active corrosion cells. In this battery, the chromium layer is the cathode and the nickel layer is the anode. We assume that on a unit area S, there is only one crack or a small hole. Since the current I on the cathode will all concentrate on this point of the anode, the current density at this point is i=I / s. If on the above-mentioned surface S, the numbe...

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Problems solved by technology

Titanium oxide or strontium salt are precious metals, and the cost is high; they are used together with calcium carbonate in a certain proportion, resulting in different consumption and addition of the two solids in the bath, which increases the difficulty of maintenance

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