Environment-friendly high-brightness medium-phosphorus chemical nickel-plating additive

Abstract

The invention discloses an environment-friendly high-brightness medium-phosphorus chemical nickel-plating additive which is composed of components A and B, wherein the component A comprises the following raw materials: a 2-5mg / L mixture of nano copper and a soluble copper salt, 2-4mg / L rhenium sulfate, 1-4mg / L sodium allysulfonate (ALS), a complexing agent, a stabilizer, and 20-40g / L NaOH; the component B comprises the following raw materials: 1-4mg / L 1,4-bis(2-hydroxyethoxy)-2-butyne (BEO), 1-3mg / L N,N-diethylaminopropyne (DEP), 1-4mg / L dibenzenesulfonimide (BBI), and 2-4mg / L sodium hydroxymethanesulphonate (PN). The formula of the environment-friendly high-brightness medium-phosphorus chemical nickel-plating additive provided by the invention contains no heavy metal ions such as cadmium and lead, and is harmless to the environment; if applied to a chemical nickel-plating solution, the additive is capable of keeping the plating solution stable so that the obtained coating is even and compact, low in porosity, high in brightness and good in nitric acid resistance; more specifically, even though the nickel coating is soaked in concentrated nitric acid for 300 seconds, the nickel coating does not change color.

Description

technical field [0001] The invention relates to an environment-friendly high-brightness medium phosphorous electroless nickel plating additive and a preparation method thereof. Background technique [0002] Electroless nickel plating, also known as electroless nickel plating, is a surface treatment technology that relies on self-catalyzed chemical reactions to deposit nickel and nickel-based alloy coatings on metal surfaces in a solution containing nickel salts, reducing agents and other auxiliary components. The coating obtained by the above process has the advantages of high hardness, good corrosion resistance, wear resistance, and uniform coating thickness. It has been widely used in many fields such as machinery, electronics, petrochemical, mining, medical equipment, automobiles, and aviation. . The coating obtained by the medium phosphorus electroless nickel plating process has good corrosion resistance, while the traditional electroless nickel plating process contains...

AI Technical Summary

Problems solved by technology

Although these harmful heavy metals in traditional electroless nickel plating wastewater are added in a small amount, it is extremely difficult to treat the wastewater. If they accumulate in the environment due to improper treatment, they will cause serious pollution to the local environment. The nature of the heavy metal itself makes this pollution Produce long-term impact, the damage to the ecological environment and human survival is catastrophic

[0003] The addition of additives in the electroless nickel plating solution can not only prevent or delay the spontaneous decomposition of the electroless nickel plating solution, play a role in stabilizing the plating solution, but also speed up the reaction sometimes and improve the phosphorus content and internal stress of the electroless nickel plating layer. Therefore, For a mature electroless nickel plating product, additives are an essential and important component, but traditional additives mostly contain heavy metals such as lead ions, and the electroless nickel plating layer is inevitably mixed with heavy metals such as lead that are harmful to the environment and human body

Especially in recent years, people have higher and higher requirements for the brightness of chemical nickel. In order to obtain a beautiful coating, a method of adding a brightener to the chemical nickel plating solution has been proposed, while the traditional relatively mature method uses heavy metal lead and cadmium ions as The electroless nickel plating process of stabilizers and brighteners can no longer meet people's requirements, especially product technical requirements and environmental emission requirements