Electrolytic Copper Foil Cleaning Fluid Composition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for treating electrolytic copper foils after anti-rust treatment are ineffective in providing long-term protection against oxidation and acid corrosion, leading to defects such as oxidation spots and discoloring, despite the use of deionized water and specific washing protocols.
Innovation Solution
A cleaning fluid composition containing a salt of a Group IIA metal, such as magnesium or calcium chloride, is used to create a cleaning solution with metal ion content greater than 10 mg/L, which is applied through a fan-shaped spray-column method to react with residual acid groups on the copper foil, adhering Group IIA metal ions to the surface and providing protection against corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deionized water washing is used to remove residual sulfuric acid, then short-term anti-discoloring effect is achieved, but long-term preservation against oxidation and acid corrosion is insufficient
Solution Approach 1:
The patent introduces an intermediary substance (chelating agent such as benzotriazole or hydroxylamine sulfate) that mediates between the copper foil and the corrosive environment. This chelating agent forms a protective complex with copper ions, preventing direct contact between sulfuric acid and the copper surface, thereby providing long-term protection against both acid corrosion and oxidation without requiring continuous water washing.
2Object-affected harmful factors
If electroplating anti-rust treatment is applied, then initial corrosion resistance is improved, but continuous corrosion occurs due to residual sulfuric acid
Solution Approach 1:
The patent changes the chemical parameter of the surface treatment by introducing chelating agents that form stable complexes with copper ions. This chemical modification creates a more durable protective layer that resists penetration by residual sulfuric acid, extending the duration of corrosion protection beyond what electroplating alone can achieve.
3Object-affected harmful factors
If frequent water washing is performed to remove residual acid, then acid corrosion is reduced, but oxidation spots and discoloring still occur over time
Solution Approach 1:
The chelating agent serves as a dual-function intermediary that simultaneously addresses both acid corrosion and oxidation. By forming a stable complex with copper ions on the surface, it creates a protective barrier that prevents both acid penetration and oxygen contact, thereby providing concurrent protection against both types of degradation without requiring frequent washing.
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
The solution effectively enhances the anti-oxidation and anti-rust corrosion properties of electrolytic copper foils, as demonstrated by improved resistance to tarnishing and corrosion in weather-resistance tests, outperforming traditional deionized water methods.
Implementation Method 1
adhering Group IIA metal ions to the surface and providing protection against corrosion
Implementation Method 2
react with residual acid groups on the copper foil
Data Source
AI summary
An electrolytic copper foil includes a copper foil body; and a IIA-group metal adhered to a surface of the copper foil body, wherein a signal strength of the IIA group metal is greater than 0.1% based on a signal strength of copper element as 100% analyzed by a secondary ion mass spectrometer. The present invention also provides a method for cleaning copper foil and a cleaning fluid composition which is used in the cleaning method.