Al-Ni alloy electroplating method in low-temperature salt melting system

Abstract

The invention relates to an electroplating method, in particular to an Al-Ni alloy electroplating method in a low-temperature salt melting system. The Al-Ni alloy electroplating method in the low-temperature salt melting system is characterized in that in a pre- electrolyzing process, both a negative pole and a positive pole adopt aluminium sheets with the purity of 99 percent; and in an electroplating process, a mild steel sheet with the thickness of 1mm is taken as the negative pole, a pure aluminium material with the purity of more than 99 percent is taken as the positive pole, and an NiCl2+RClX+AlCl3+NaCl+KCl mixture is added into an electrolysis bath and is heated and melted into an electrolyte for electroplating. The invention has the advantages that aluminium and nickel chlorides are adopted as raw materials, and an additive is added, so that aluminium ions and nickel ions are electrolyzed and deposit together on negative-pole materials to generate a uniform and dense Al-Ni alloy plating; and through the adoption of the Al-Ni alloy electroplating method provided by the invention, low heat energy is required for producing the plating, the oxidation loss of the alloy metal is small, and the production cost is low.

Description

technical field [0001] The invention relates to an electroplating method, in particular to a method for electroplating an Al-Ni alloy in a low-temperature molten salt system. Background technique [0002] Molten salt electroplating is a new process that emerged with the development and application of molten salt electrochemistry. The so-called molten salt electroplating is a material treatment process in which a solid metal coating is obtained on the base material by using an external current in molten salt. Davis et al. reported in 1956 that in NaLiB 2 o 4 -NaLiWO 4 -WO 3 The refractory metal tungsten is electroplated in oxide molten salt, the working temperature is 900℃, and the thickness of the obtained coating is up to 20μm. In the 1960s, S.Senderoff and others successfully electroplated refractory metals in LiP-NaF-KF molten salt for the first time, and N.C.CooK and others also succeeded in alloying metal surfaces in molten salts, which is also a sign that molten s...

AI Technical Summary

Problems solved by technology

Experiments have shown that Ni is electrodeposited on the cathode substrate from the molten salt system through an instantaneous nucleation mechanism in the early stage of crystal growth; since controlling the current or controlling the potential will affect multiple stages of coating formation, it is difficult to simply control the current and single-phase Ni 3 Al alloy coating