Zinc nickel and nickel tungsten electroplating liquid, and preparing method and electroplating method of electroplating liquid

Abstract

The invention relates to the field of electroplating, and provides zinc nickel and nickel tungsten electroplating liquid and a preparing method and an electroplating method of the electroplating liquid. Raw materials of each liter of electroplating liquid comprise 10 to 35g of nickel sulfate, 45 to 70g of sodium hydroxide, 3 to 12g of sodium tungstate, 5 to 12g of zinc powder, 0.1 to 1.5g of an addition agent A, 0.1 to 0.8g of an addition agent B, 15 to 50 g of a complexing agent and the balance deionized water. The electroplating method comprises the steps that a pure iron plate serves as ananode, a part to be electroplated serves as a cathode, the anode and the cathode are inserted in the zinc nickel and nickel tungsten electroplating liquid, under the first current density, electroplating is carried out, then, the first current density is converted into second current density with the current density higher than the first current density, electroplating is carried out, and a zinc nickel and nickel tungsten dual-layer plating can be obtained. The dual-layer plating can be obtained at one time, and the dual-layer plating can be used for preventing chemical corrosion, electrochemical corrosion and physical wear at the same time.

Description

technical field [0001] The invention relates to the field of electroplating, in particular to a zinc-nickel and nickel-tungsten electroplating solution, a preparation method thereof, and an electroplating method. Background technique [0002] In the field of petroleum machinery technology, with the development of oil and gas exploration and development, the environment faced by oil and gas exploitation is becoming more and more harsh and complex. There are not only chemical corrosion and electrochemical corrosion, but also partial wear and fatigue problems. For the surface of petroleum machinery Treatment process, currently there is no surface treatment technology that is both anti-corrosion and wear-resistant and has low cost. With the continuous consumption of petroleum resources, the environment for oil exploitation is getting worse and worse, and the requirements for corrosion resistance and friction resistance of petroleum equipment are also getting higher and higher. ...

AI Technical Summary

Problems solved by technology

[0003] Traditional surface treatment technologies are mainly electroplating chromium, copper, zinc, nickel, nickel-based alloys and other technologies. Zinc and zinc-nickel alloy coatings are anodic protective coatings, which can prevent electrochemical corrosion very well. It dissolves quickly in the medium, and the hardness is very low, so it has no wear resistance; the electroplated chromium coating has good wear resistance and corrosion resistance, and the chromium coating has poor corrosion resistance in chloride ions, hydrogen sulfide and acidic media; nickel-based alloys ( Nickel-cobalt, nickel-phosphorus, nickel-tungsten-phosphorus) have good acid resistance and wear resistance, but the stress of the coating is large, the fatigue resistance is poor, the coating has defects or micro-cracks due to fatigue, it is easy to accelerate the corrosion of the base steel, and it is easy to cause perforation problem

Combining traditional processes such as copper / nickel / chromium and nickel / chromium multilayer coatings has the characteristics of anti-corrosion, anti-wear, and anti-electrochemical corrosion. The multi-layer coatings obtained by traditional processes have obvious boundaries, and the bonding force and fatigue resistance are relatively low. Poor, it is easy to fall off between the coating and the coating during use, and lose its protective performance; taking the sucker rod as an example, the upper sucker rod with a well depth of 2000 meters will be stretched by about 1 meter, and the sucker rod will be stretched during the working process. There are different degrees of bending, which limits the application of traditional multi-layer coatings in this field