A Barrel Nickel Gold Plating Process for Iron Substrates

Abstract

The invention belongs to the electroplating field of the barrel plating method, and discloses a barrel nickel gold plating process for an iron substrate, comprising the following steps: degreasing; pickling; the first phosphorus nickel plating: the plating solution is prepared by nickel sulfate, Ni 2+ The concentration is 60~90g / L, nickel chloride 40~50g / l, boric acid 35~45g / l and phosphorus nickel additive 50~80ml / L, the pH of the plating solution is 1.0~1.5; the temperature of the plating solution during electroplating is 55~60°C , current density 1~3ASD; after plating, wash with nickel recovery water at 40~50℃, and then with deionized water at room temperature; semi-glossy nickel plating: the plating solution is prepared from nickel sulfate, Ni 2+ The concentration is 90~110g / l, nickel chloride 40~50g / l, boric acid 35~45g / l and semi-glossy nickel additive 1~5ml / L. The present invention provides a process for nickel-plating and gold-plating on an iron substrate and a method for preparing a plating solution. Since the standard electrode potential of phosphorus -0.499 is very close to that of iron -0.447, oxidation-reduction reactions are not easy to occur. In addition, phosphorus nickel + semi-glossy nickel + phosphorus nickel three The advantage of the process design of layer nickel is: due to the different crystallization methods of different nickel coatings, semi-gloss nickel can cover the pores of phosphorus nickel, and then a layer of phosphorus nickel coating can cover the pores of semi-gloss nickel.

Description

technical field [0001] The invention relates to the field of barrel plating electroplating, in particular to an iron substrate barrel nickel gold plating process. Background technique [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, and 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 a...

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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