Nickel-plating and gold-plating process for iron base material

Abstract

The invention belongs to the field of electroplating of barrel plating modes, and discloses a nickel-plating and gold-plating process for an iron base material, which comprises the following steps: removing oil; pickling; primary nickel-phosphate plating, wherein a plating solution is prepared from nickel sulfate, the concentration of Ni < 2 + > ranges from 60 g / L to 90 g / L, the concentration of nickel chloride ranges from 40 g / L to 50 g / L, the concentration of boric acid ranges from 35 g / L to 45 g / L, and the concentration of a phosphorus-nickel additive ranges from 50 ml / L to 80 ml / L, and the pH value of the plating solution ranges from 1.0 to 1.5; during electroplating, controlling the temperature of the plating solution to be 55-60 DEG C, and controlling the current density to be 1-3 ASD; after plating is completed, cleaning with nickel recycled water at the temperature of 40-50 DEG C and then cleaning with normal-temperature deionized water; semi-gloss nickel plating, wherein a plating solution is prepared from nickel sulfate, the concentration of Ni < 2 + > ranges from 90 g / l to 110 g / l, the concentration of nickel chloride ranges from 40 g / l to 50 g / l, the concentration of boric acid ranges from 35 g / l to 45 g / l, and the concentration of a semi-gloss nickel additive ranges from 1 ml / L to 5 ml / L. According to the nickel-plating and gold-plating process for the iron base material and the plating solution preparation method, due to the fact that the phosphorus standard electrode potentials-0.499 and iron-0. 447 are very close to each other, oxidation-reduction reaction is not prone to occurring, and in addition, the process design of phosphorus nickel, semi-gloss nickel and phosphorus nickel three-layer nickel has the advantages that due to the fact that different nickel plating layers are different in crystallization mode, the semi-gloss nickel can cover pores of the phosphorus nickel; and then a phosphorus-nickel plating layer can be plated to cover pores of the semi-gloss nickel.

Description

technical field [0001] The invention relates to the field of electroplating by barrel plating, in particular to an iron base material barrel plating nickel-gold plating process. Background technique [0002] In the field of electroplating, when the base material is iron, nickel, and gold-plated products for salt spray testing, the salt spray test is an environment that mainly uses the artificial simulated salt spray environmental conditions created by the salt spray test equipment to assess the corrosion resistance of products or metal materials. In the test, since the standard electrode potential of iron is -0.447 and that of nickel is 1.678, the difference between the two electrode potentials is large, and iron easily obtains electrons and undergoes a redox reaction, which makes it difficult for the salt spray test to pass 8h. However, at present, the terminals are telecom base stations, network communications, consumer electronic connectors, connectors and other products....

AI Technical Summary

Problems solved by technology

[0002] In the field of electroplating, when the substrate is iron-nickel-plated gold-plated products for salt spray testing, the salt spray test is an environment that mainly uses artificially simulated salt spray environmental conditions created by salt spray test equipment to evaluate the corrosion resistance of products or metal materials. In the test, because the standard electrode potential of iron is -0.447, while that of nickel is 1.678, the electrode potential difference between the two is large, iron is easy to get electrons and redox reaction occurs, which makes it difficult to pass the salt spray test for 8 hours

However, at present, the terminals are telecommunications base stations, network communications, consumer electronics connectors, connectors and other products. When they are actually used, they will be affected by environmental moisture, acid gas or alkali gas, which will cause corrosion to the coating, and even human sweat will cause damage to the coating. It will cause corrosion to the coating of the product. After the coating is corroded, the impedance will increase and affect the signal transmission. In order to improve the above problems and improve the service life of the product, the salt spray test is required to pass 24 hours during design. The traditional electroplating process cannot meet this design requirement. Makes the electroplating factory urgently need a solution

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