Methods for controlling the phosphorus content of chemical nickel

Author: Robby

Methods of controlling chemical nickel-phosphorus content mainly include adjusting the composition and content of chemical nickel-plating solution, changing the plating parameters, and controlling the chemical composition and operating conditions in the plating bath. 

Adjusting the composition and content of the electroless nickel bath

1. Adding malic acid: Adding a certain level of malic acid to the electroless nickel plating layer can increase the phosphorus content1.
2. Use of Acid Phosphorus Electroless Nickel: Adding acid phosphorus electroless nickel to the plating bath formulation can increase the nickel ion concentration and pH value, thereby reducing the phosphorus content.

Change plating parameters

1. Control of plating solution concentration, temperature and pH: Fixing process parameters such as concentration, temperature and pH within a small range can achieve stable plating speed and plating quality.
2. Adjusting the plating solution formulation: By changing the ratio of components in the plating solution formulation, the phosphorus content of the plated layer can be adjusted.

Control of chemical composition and operating conditions in the plating bath

1. Use high phosphorus electroless nickel concentrate: such as Bigelow's Ni-811, this high phosphorus electroless nickel plating process obtains a layer with good toughness and corrosion resistance.
2. Adjust the plating conditions: the concentration of the plating solution, temperature and pH value during plating will have a significant effect on the phosphorus content. For example, an increase in temperature will reduce the phosphorus content, and an increase in pH will also reduce the phosphorus content of the plated layer.

Influence of phosphorus content on the performance of electroless nickel

1. The relationship between phosphorus content and plating performance: high phosphorus content of chemical nickel plating layer has higher corrosion resistance and oxidation resistance, but lower hardness; low phosphorus content of chemical nickel plating layer has higher hardness and magnetism, but weaker corrosion resistance.
2. The effect of phosphorus content on toughness: nickel-phosphorus alloys with high phosphorus content have higher toughness, which can mitigate crack generation and diffusion and maintain integrity when subjected to mechanical impact or stress; low phosphorus alloys show higher hardness and are suitable for environments with high wear resistance requirements.

Through the above methods, the phosphorus content in chemical nickel can be effectively controlled and regulated to meet the needs of different industrial applications.