Passivation Layer Prevents Metal Deposition on Substrates
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Solution Overview
Problem
The existing methods for forming metal patterns on plastic substrates using electroless plating often result in unwanted metal layers adhering to metal components, leading to increased plating costs and the risk of short circuits, due to the active metal surfaces of components like metal nuts, which also cause poor appearance and inefficient use of plating baths.
Innovation Solution
A chemical surface treatment using a thiol compound solution is applied to the metal base to form a passivation layer, which is chemically bonded to the surface, preventing extra metal layers from forming during electroless plating and reducing the consumption of plating solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electroless plating is used to form metal patterns on plastic substrates, then metal patterns can be formed on the substrate, but extra metal layers are adhered to metal components causing increased plating costs and short circuit risks
Solution Approach 1:
The patent applies preliminary action by performing chemical treatment on metal components before electroless plating to create a passivation layer. This pre-treatment prevents unwanted metal deposition during the plating process, eliminating the need for post-processing and reducing plating solution consumption. The passivation layer is formed in advance to exclude metal ions from adhering to metal components.
Solution Approach 2:
The patent uses a passivation layer as an intermediary substance between the plating solution and metal components. This intermediate layer chemically bonds to the metal surface and provides a barrier that prevents direct interaction between metal ions and the metal component, thereby preventing unwanted metal deposition while allowing the plating process to proceed normally on the substrate.
2Object-affected harmful factors
If positive charge is applied to metal components through electrodes to prevent unwanted electroless plating, then metal ion adhesion is reduced, but the plating bath becomes unstable and expensive fixtures are needed
Solution Approach 1:
The patent replaces the mechanical/electrical system of applying positive charge through electrodes with a chemical system. Instead of using external power sources and electrode fixtures to create electrostatic repulsion, the invention uses chemical passivation to create a protective layer that naturally prevents metal ion adhesion, eliminating the need for complex electrical equipment.
Solution Approach 2:
The patent employs a simple chemical treatment process that can be performed using basic chemical solutions without requiring expensive, reusable fixtures. The passivation layer is formed through a straightforward chemical reaction that is easier and cheaper to implement than the electrode-based systems, making the process more accessible and cost-effective.
3Strength
If metal layers are plated on metal nut thread surfaces, then metal components are secured, but the metal layers are squeezed and falling down causing short circuits
Solution Approach 1:
The patent applies local quality by creating different surface properties in different locations. The passivation layer is selectively applied to metal components where it is needed to prevent unwanted plating, while leaving other areas unaffected. This localized treatment ensures that metal layers are formed only where intended on the substrate, not on metal components where they would cause short circuits.
Data Source
AI summary
A manufacturing method of a substrate structure including the following steps is provided. A chemical surface treatment is performed on a metal base such that a passivation layer is formed on a surface of the metal base. The metal base is assembled to a substrate. A metal pattern is formed on the substrate, wherein the metal pattern is separated from the metal base. A substrate structure and a metal component are also provided.