Anolyte Dosing Valve Manifold for Tin Precipitation Control
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Solution Overview
Problem
Existing electroplating processes face challenges in safely and efficiently introducing tin solutions into anode chamber flow loops, as tin precipitates in water, leading to clogged supply lines and health hazards.
Innovation Solution
The electroplating apparatus is designed with a system that allows for the direct and controlled dosing of tin solution into the anode chamber flow loop, using a valve manifold configuration that separates the tin solution from water and acid during the electroplating phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tin solution is introduced into the anode chamber flow loop using conventional mixing methods, then the anolyte solution can be prepared, but tin precipitates in water causing clogged supply lines and health hazards
Solution Approach 1:
The system divides the dosing process into separate stages: first dosing acid and water to establish proper chemistry in the anolyte chamber, then separately dosing tin solution only when needed. This segmentation prevents tin from being exposed to water in the supply lines, eliminating precipitation and clogging issues while maintaining supply line reliability
Solution Approach 2:
The system performs preliminary dosing of acid and water into the anolyte chamber before introducing tin solution. By establishing the proper acidic environment first, the tin solution can be safely dosed without precipitating in the supply lines, as the acidic conditions are already in place to keep tin dissolved
2Quantity of substance
If tin solution is dosed into the anode chamber, then the plating composition is achieved, but operator exposure to tin solution increases creating health hazards
Solution Approach 1:
The system uses acid and water as intermediary substances that are dosed first to prepare the anolyte chamber environment. This intermediary approach allows tin solution to be dosed safely into an already-prepared acidic environment rather than mixing all components in the supply lines, reducing operator exposure while achieving the required tin content in the final plating solution
Solution Approach 2:
The system extracts the tin dosing step from the general mixing process and isolates it as a separate, controlled operation. By taking out the tin solution dosing and performing it only after the chamber is prepared with acid and water, the system minimizes the time and conditions under which tin solution is handled, thereby reducing operator exposure while maintaining proper plating composition
3Manufacturing precision
If conventional dosing methods are used, then all components can be added to the anolyte, but precise control of anolyte composition becomes difficult
Solution Approach 1:
The system implements dynamic, conditional dosing control where the dosing sequence adapts based on process stage. During fill operations, acid and water are dosed first to establish proper chemistry; during plating operations, only tin solution is dosed into the pre-prepared anolyte. This dynamic approach provides precise composition control while keeping the dosing system manageable through clear operational phases
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 configuration reduces the risk of tin precipitation in supply lines, minimizes exposure to tin solution for operators, and ensures accurate and safe composition of the anolyte solution during the electroplating process.
Implementation Method 1
a flow meter configured to dose components of the anolyte solution into each anode chamber flow loop
Implementation Method 2
The first valve manifold comprises a first shutoff valve operable to selectively fluidly couple a source of water to the flow meter, and further comprises a second shutoff valve selectively operable to fluidly couple sources of acid and bulk inorganic plating components to the flow meter
Implementation Method 3
Electroplating involves the electrochemical reduction of dissolved ions of a selected metal to an elemental state on the substrate surface, thereby forming a film of the selected metal on the substrate
Implementation Method 4
a check valve positioned between the fourth shutoff valve and the source of acid
Data Source
AI summary
An electroplating apparatus comprises an anode chamber flow loop. The anode chamber flow loop comprises an anode chamber that contains an anolyte solution and an anode. A flow meter doses anolyte solution components into the anode chamber flow loop. A first valve manifold supplies components of the anolyte solution to the flow meter. The first valve manifold comprises a first shutoff valve operable to selectively fluidly couple a source of water to the flow meter, and a second shutoff valve operable to fluidly couple sources of acid and bulk inorganic plating components to the flow meter. A second valve manifold is fluidly coupled to the second shutoff valve and comprises a third shutoff valve operable to fluidly couple the source of bulk inorganic plating components to the first valve manifold, and a fourth shutoff valve operable to fluidly couple the source of acid to the first valve manifold.