Chromium-Free Nickel Plating for Resin Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for forming a surface-treated steel sheet for metal containers, particularly in the food and beverage industry, do not achieve sufficient adhesion between the steel sheet and the organic resin layer after forming processes like drawing or drawing-ironing, especially when chromium-free alternatives are sought.
Innovation Solution
A chromium-free organic resin coated surface-treated steel sheet is developed with a nickel plating layer having fine particles of 2 to 500 pieces/µm² and an average size of 0.05 to 0.7µm, formed using a nickel plating bath with low nickel ion concentration, and optionally including metallic tin, with an alloy layer of iron and nickel, and an oxygen compound like Zr, Ti, or Al applied between the steel sheet and the organic resin layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If chromium-free nickel plating is applied to steel sheet, then environmental safety is improved, but adhesion between steel sheet and organic resin layer after working deteriorates
Solution Approach 1:
The patent applies local quality by creating an uneven surface structure with specific particle density (2-500 pieces/µm²) and average particle size (0.05-0.7 µm) on the nickel plating layer. This localized surface modification enhances adhesion of the organic resin layer to the chromium-free nickel plating, resolving the contradiction between environmental safety and adhesion reliability.
Solution Approach 2:
The patent changes physical parameters of the nickel plating surface by controlling particle density and average particle size within specific ranges. These parameter changes create an optimal surface morphology that improves resin adhesion while maintaining chromium-free composition, thus resolving the technical contradiction.
2Reliability
If conventional nickel plating is applied to steel sheet, then adhesion between steel sheet and organic resin layer is improved, but environmental safety deteriorates due to chromium usage
Solution Approach 1:
The patent extracts and eliminates chromium from the plating composition, using only nickel-based plating. By removing the harmful chromium component while compensating with controlled nickel particle structure, the patent achieves both environmental safety and adequate adhesion performance.
3Reliability
If island-like tin is formed on nickel plating, then adhesion at high temperature is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces the complex multi-step process involving tin plating and melting with a simpler nickel plating process that directly achieves the desired adhesion. The controlled nickel particle structure serves as a permanent adhesion promoter without requiring additional tin layers or high-temperature melting steps.
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 approach ensures excellent adhesion between the steel sheet and the organic resin layer even after forming processes, maintaining high peel strength and preventing resin peeling, thus enhancing the durability and performance of metal containers.
Implementation Method 1
nickel plating is applied to at least one-side surface of the surfaces of a steel sheet by coating
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a container-use surface treated steel sheet which is manufactured without using chromium and exhibits excellent working adhesion with a coated organic resin, a method of manufacturing the container-use surface treated steel sheet, an organic resin coated surface treated steel sheet. The container-use surface treated steel sheet is a surface treated steel sheet where nickel plating is applied to at least one-side surface of surfaces of a steel sheet by coating, wherein nickel plating has a fine particle shape formed by fine particles which has particle density of 2 to 500 pieces/µm2 and having an average particle size of 0.05 to 0.7µm. The container-use surface treated steel sheet is also characterized in that a coating weight of the nickel plating of the container-use surface treated steel sheet is 0.1 to 12g/m2, metal tin is contained in coating of the nickel plating, and an amount of metal tin is 0. 05 to 0. 1g/m2. The organic-resin-coated surface treated steel sheet of the present invention is characterized in that an organic resin layer is formed on at least one surface of the container-use surface treated steel sheet. The metal can is formed by working the organic-resin-coated surface steel sheet.