Electrochemical Coating Device Segmentation for Contamination Control
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Solution Overview
Problem
Existing electrochemical coating processes face contamination issues due to the sensitivity of alternative solvents, particularly ionic liquids, which are prone to reaction with water and air humidity, leading to impaired coating quality and increased costs.
Innovation Solution
A device comprising a coating container and a storage container connected by a small passage opening without a closing mechanism, made from stable materials like stainless steel or ceramics, with a protective coating to prevent contamination, and designed to minimize surface area for moisture ingress, allowing gravity-driven flow of coating liquid between containers without pumps or moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If alternative solvents like ionic liquids are used for electrochemical coating, then deposition of certain metals such as aluminum becomes possible, but the coating liquid becomes sensitive to contamination from atmospheric humidity and reacts with water
Solution Approach 1:
The device is divided into a storage container for the coating liquid and a coating container for the workpiece, connected by a small passage opening. This segmentation allows the coating liquid to be stored separately and only come into contact with the workpiece during the coating process, minimizing exposure to atmospheric humidity and contamination.
Solution Approach 2:
The storage container is designed to be largely closed, creating a protected environment that isolates the sensitive ionic liquid coating material from atmospheric moisture and contamination, thereby maintaining its reliability and preventing unwanted reactions.
2Reliability
If a closure mechanism is installed in the connection between containers, then contamination can be prevented, but the device complexity increases
Solution Approach 1:
The closure mechanism is completely removed from the system. Instead of using valves or seals that could fail or contaminate the coating liquid, the design relies on the small passage opening and gravitational control to prevent contamination, significantly reducing device complexity.
Solution Approach 2:
The system uses the natural properties of the small passage opening and gravity to control fluid flow and prevent contamination without requiring active control mechanisms. The geometry itself provides the protection function that would otherwise require complex mechanical components.
3Productivity
If a large opening is used for connection between containers, then fluid flow is unimpeded, but gases and dissolved moisture can ingress into the storage container
Solution Approach 1:
The passage opening has a specifically optimized local geometry that is small enough to minimize contamination ingress but large enough to allow adequate fluid flow. The local quality of this opening is carefully controlled to balance the conflicting requirements of flow rate and contamination protection.
Solution Approach 2:
The passage opening provides partial fluid flow capability rather than complete freedom of flow. This partial action is sufficient for the coating process while providing the added benefit of contamination protection that would be lost with a larger opening.
4Ease of operation
If the storage container is positioned above the coating container, then coating liquid can flow by gravity, but the surface area exposed to atmosphere increases contamination risk
Solution Approach 1:
The system is segmented into distinct storage and coating zones connected by a controlled passage. This segmentation allows the storage container to be positioned for gravity flow while the passage geometry minimizes the surface area of coating liquid exposed to the atmosphere, reducing contamination risk.
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 design minimizes contamination, ensures the usability of the coating liquid, reduces wear and maintenance, and maintains high-quality coatings while reducing costs associated with solvent replacement and reprocessing.
Implementation Method 1
designed to minimize surface area for moisture ingress, allowing gravity-driven flow of coating liquid between containers without pumps or moving parts
Implementation Method 2
a voltage is applied between the workpiece and a counter electrode. This causes binders and/or metal particles dissolved in the bath to precipitate onto the surface of the workpiece
Implementation Method 3
the plating bath contains ions of one or more elements with which the workpiece is to be coated. For plating, a voltage is applied to the workpiece, causing the ions in the plating fluid to be electrolytically discharged at the workpiece's surface. This results in the deposition of a layer on the surface.
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
The invention relates to a device (1, 101, 201) for electrochemically coating a work piece (22), comprising a coating reservoir (2, 102, 202) with a feed opening (5) and comprising a supply reservoir (3, 103, 203), wherein the two reservoirs are connected by way of a penetration opening (4, 104, 204). The device comprises at least one electrode (11) and one opposite electrode (14). In order to prevent contamination of a coating fluid (20, 120, 220) during an electrochemical deposition process, the device can be moved between a coating position and a rest position by rotating the supply and the coating reservoirs about at least one common axis (A, A', A") so that the center of gravity of the volume of the coating reservoir (2, 102, 202) in the coating position is lower relative to the center of gravity of the volume of the supply reservoir (3, 103, 203) than in the rest position. The invention further relates to a method for coating work pieces.