Nickel Electroplating Solution Rare Earth Impurity Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for removing rare earth impurities from nickel-electroplating solutions are inefficient and require complicated steps or special agents, leading to poor plating quality and increased production costs due to the need for frequent solution replacement.
Innovation Solution
Heating the nickel-electroplating solution to 60° C or higher to precipitate rare earth impurities, which are then removed by sedimentation and/or filtration, allowing for repeated concentration of the solution without the need for special agents or preliminary baths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods (adding nickel compound to elevate pH or cathodic electrolysis) are used to remove impurities, then iron and organic impurities are removed, but rare earth impurities remain in the plating solution
Solution Approach 1:
The patent changes the pH parameter of the plating solution from acidic (conventional condition) to neutral or weakly alkaline (pH 6.5-8.5). This parameter change causes rare earth impurities to precipitate as hydroxides, enabling their removal through filtration or decantation, thereby resolving the contradiction between maintaining plating quality and removing rare earth impurities
Solution Approach 2:
The patent induces phase transition of rare earth impurities from dissolved state to precipitated solid state by adjusting pH. The rare earth hydroxides formed precipitate out of solution, allowing separation from the plating solution through filtration or decantation, thus removing the impurities while preserving plating solution functionality
2Reliability
If the plating solution is replaced frequently to maintain quality, then plating defects are prevented, but production costs increase
Solution Approach 1:
The patent recovers and reuses the plating solution after removing rare earth impurities through pH adjustment and filtration. Instead of discarding the solution when impurities accumulate, the method regenerates it by precipitating and removing rare earth hydroxides, thereby maintaining plating quality consistency while reducing solution replacement frequency and production costs
3Loss of substance
If rare earth impurities accumulate in the plating solution, then production cost is reduced, but plating defects such as poor gloss and decreased adhesion occur
Solution Approach 1:
The patent enables the plating solution to self-purify by adjusting its own pH to neutral or weakly alkaline conditions, causing rare earth impurities to precipitate automatically. This self-service mechanism allows continuous operation without external intervention for impurity removal, maintaining plating quality while reducing solution replacement needs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively reduces rare earth impurities to acceptable levels, preventing plating defects and reducing production costs by allowing for the reuse of the plating solution, thereby stabilizing the quality of nickel electroplating on sintered R—Fe—B magnets.
Implementation Method 1
keeping a nickel-electroplating solution containing rare earth impurities at a temperature of 60° C. or higher for a predetermined period of time
Implementation Method 2
removing precipitate generated by heating from the nickel-electroplating solution
Implementation Method 3
removing precipitate generated by heating from the nickel-electroplating solution by sedimentation and/or filtration
Data Source
AI summary
[Object] When rare earth magnets are plated, components of the rare earth magnets are dissolved in the plating solution, causing plating defects. Thus, an easy method for removing rare earth impurities has been necessary.[Means for Solution] A nickel-electroplating solution containing rare earth impurities is kept at 60° C. or higher for a predetermined period of time to precipitate rare earth impurities for separation by sedimentation or filtration. Rare earth impurities can be precipitated further efficiently by adding precipitate to the nickel-electroplating solution, or by concentrating the nickel-electroplating solution by heating.