Electroplated zinc- nickel alloy refers to the formation of a zinc-nickel 9: 1 coating on the surface of plated parts. This protective coating has developed rapidly in recent years due to its excellent corrosion resistance and is widely used in automotive, aviation, electronics and other industries.
With the rapid development, the difficulty of wastewater treatment has increased. Due to the instability of the zinc-nickel alloy plating solution, additives need to be added to the zinc-nickel alloy plating solution to maintain the balance of the plating solution. Among them, the wastewater treatment difficulty The effects are compared with complexing agents such as citric acid, tartaric acid, and amine organic compounds. Such complexing agents in the electroplating solution can prevent reduction and precipitation through the complexation of zinc and nickel ions, but the complexing agent is powerful The effect is long-lasting, which makes it difficult to remove a large amount of zinc-nickel chelating groups in the wastewater.
In the early stage of the development of zinc-nickel alloy plating, the treatment of wastewater was relatively simple, causing a large amount of heavy metals to flow into the river, causing unpredictable damage to the ecology. With the gradual awakening of people's awareness of ecological protection, wastewater treatment technology has also continued Develop and innovate. At the moment, China ’s discharge standards for electroplating wastewater are the strictest in the world. Accompanying it is the world ’s leading electroplating wastewater treatment technology. For wastewater alone, from the beginning, a single sodium sulfide treatment and sodium hypochlorite breaking network In the future, the first-generation and second-generation removers gradually derived, and now, without breaking the network, you can directly compete with the complexing agent for the zinc-nickel alloy treatment agent HMC-M2 for zinc-nickel ions. According to the agent ’s The principle and effect of wastewater treatment technology can be said to be enough to closely follow the continuous innovation of zinc-nickel plating solution within five years.
The specific principle of HMC-M2 is that after dissolving in water, it can be combined with zinc and nickel ions in aqueous solution to form groups, and then the groups are aggregated together to form larger particles through a supporting precipitation process, and finally separated from the water by gravity, and The core is that the substance has a higher chelating ability to zinc and nickel ions than complexing agents such as citric acid, so it does not need to destroy the chelating groups already formed in the water, which simplifies the processing process; in addition, its chelation The strong ability is reflected in the actual treatment results, which can reach the concentration of nickel ion <0.1mg / l, zinc ion concentration <1mg / l in the water, which is the lower limit of Table 3 of the higher discharge standard for electroplating wastewater. 2. Stable effect processing technology.