Mixed Metal Pellet Anodes for Stable Alloy Plating
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Solution Overview
Problem
Existing methods for manufacturing metal sheets with alloy plated layers face challenges in maintaining constant metal ion concentrations in the plating bath, leading to unstable composition and high manufacturing costs due to the use of metal salt compound powders or complex anode configurations.
Innovation Solution
The method involves using mixed metal pellets as anodes with controlled surface area ratios to maintain consistent metal ion concentrations, ensuring stable alloy composition by supplementing pellets according to their weight ratios and surface areas during electroplating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If metal salt compound powders are added to supplement metal ions, then metal ion concentration is maintained, but manufacturing cost increases and anion concentration increases causing quality issues
Solution Approach 1:
The invention extracts only the beneficial component (metal ions) from the metal salt compound by using pure metal pellets as anodes. The metal ions are released through electrochemical dissolution while the harmful anions are left behind in the anode structure and do not enter the plating bath, thus maintaining metal ion concentration without increasing anion concentration.
Solution Approach 2:
The invention uses inexpensive pure metal pellets as disposable anodes that are continuously consumed and replaced. These pellets are cheaper than metal salt compound powders and provide a sustainable source of metal ions without introducing harmful anions into the system.
2Quantity of substance
If pure metal pellets are used as anodes, then metal ion concentration is maintained without anion increase, but controlling the ratio of different metal ions becomes difficult
Solution Approach 1:
The invention applies local quality by using different pure metal pellets for different anodes based on the desired alloy composition ratio. Each anode is dedicated to a specific metal type, and the surface area of each anode is proportionally adjusted to achieve the target ion release ratio, ensuring precise control over alloy composition.
Solution Approach 2:
The invention controls the alloy composition by changing the physical parameter of anode surface area. By adjusting the surface area ratio of different metal anodes, the rate of metal ion release is controlled, thereby achieving the desired alloy composition ratio in the plated layer.
3Manufacturing precision
If multiple separate anodes are used for different metals, then alloy composition can be controlled, but device complexity and current control difficulty increase
Solution Approach 1:
The invention merges multiple pure metal anodes into a single composite anode structure where different metal pellets are positioned together. This unified anode assembly simplifies the device configuration while maintaining the ability to control alloy composition through proportional surface area distribution of different metals.
4Manufacturing precision
If alloy pellets are used as anodes, then alloy composition can be maintained, but manufacturing difficulty increases especially for high melting point metals
Solution Approach 1:
The invention segments the alloy anode into separate pure metal pellets for each component metal. This avoids the complex manufacturing process of creating alloy pellets, especially for high melting point metals, while still achieving the desired alloy composition through controlled dissolution of individual pure metal anodes.
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 approach stabilizes the composition of the alloy plated layer, reduces manufacturing costs, and prevents the increase of unwanted anions, achieving uniform nickel-cobalt alloy layers with desired conductivity properties.
Implementation Method 1
when a metal sheet having an alloy plated layer is manufactured, an anode obtained by mixing two or more kinds of pellets of metals for forming the alloy plated layer is used as the anode to be used for the electroplating
Implementation Method 2
a method of forming an alloy plated layer comprising some metals such as nickel and cobalt on a metal sheet such as a steel sheet by means of electroplating
Data Source
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AI summary
There is provided a method of manufacturing a metal sheet having an alloy plated layer, the method including a step of passing a metal strip continuously through a plating bath to perform electroplating in the plating bath, the plating bath including a plating liquid and an anode, the plating liquid containing two or more kinds of metal ions for forming the alloy plated layer, wherein an anode obtained by mixing two or more kinds of metal pellets is used as the anode, the metal pellets being formed of respective metals that form the alloy plated layer, wherein a mixing ratio of each metal pellet that constitutes the anode is determined based on a total surface area ratio of each metal pellet in the anode so that a dissolution ratio of each metal pellet that constitutes the anode is a dissolution ratio corresponding to a weight ratio of each metal that constitutes the alloy plated layer.