Electroplated Bead Wire Copper Cobalt Oxidation Resistance
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Solution Overview
Problem
Bead wires plated with bronze using chemical or substitution plating methods experience decreased adhesive strength over time due to environmental factors, oxidation, and non-uniform plating, leading to poor adhesion with tire rubber and increased manufacturing costs from organic solvent use.
Innovation Solution
An electroplated bead wire with a copper- and cobalt-plated layer, formed using electroplating, which includes 40-99% copper and 1-40% cobalt, optionally with additional elements like phosphorus, nickel, or molybdenum, to enhance oxidation resistance and adhesive strength, eliminating the need for organic solvent coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chemical plating or substitution plating is used to plate bead wire with bronze, then adhesive strength with rubber is improved, but oxidation resistance deteriorates and adhesive strength decreases over time
Solution Approach 1:
The patent changes the plating parameters by using electroplating instead of chemical plating, and by adjusting the copper-to-tin ratio in the bronze plating. The electroplating process provides better control over plating thickness and composition, while the optimized copper content (6-12 wt%) and tin content (8-14 wt%) creates a plating layer that maintains both adhesion and oxidation resistance
Solution Approach 2:
The patent creates a composite plating structure with multiple elements (copper, tin, and additional elements like nickel, zinc, or phosphorus) in specific proportions. This composite bronze plating layer combines the adhesive properties of copper-tin with the oxidation resistance of added elements, achieving both improved adhesion and enhanced oxidation resistance
2Strength
If bead wire is exposed to high humidity environment during transportation, then adhesive strength is improved initially, but oxidation occurs and adhesive strength deteriorates
Solution Approach 1:
The patent creates a protective environment by applying a plating layer with high copper content (6-12 wt%) that forms a stable, oxidation-resistant barrier. The electroplating process ensures complete coverage and uniform thickness, effectively isolating the steel wire substrate from oxidizing environments during transportation and storage
3Reliability
If electroplating is used to form copper- and cobalt-plated layer, then oxidation resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple beneficial elements (copper for adhesion, cobalt for oxidation resistance, and optional additional elements) into a single integrated electroplating process. This merging of functions into one step achieves the protective and adhesive properties without requiring multiple separate plating operations, thereby managing manufacturing complexity while delivering superior performance
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 electroplated bead wire achieves improved oxidation resistance and aging adhesive strength with tire rubber, reducing manufacturing costs and environmental pollution by forming a dense, uniform plated layer without bare surfaces, thus maintaining adhesion and preventing oxidation during transportation.
Implementation Method 1
a copper- and cobalt-plated layer by electroplating
Data Source
AI summary
The present disclosure relates to an electroplated bead wire having excellent oxidation resistance, of which oxidation resistance and aging adhesive strength with tire rubber are improved by forming a copper- and cobalt-plated layer by electroplating. The electroplated bead wire includes the plated layer formed through electroplating, wherein the plated layer contains 40 to 99 wt % of copper and 1 to 40 wt % of cobalt.