Particulate Tin Surface-Treated Steel Sheet for Resin Adhesion
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Solution Overview
Problem
Resin-coated steel sheets used for manufacturing cans face issues with adhesiveness during severe forming processes, particularly due to poor corrosion resistance and separation of the resin layer, and existing solutions increase manufacturing costs or result in inferior adhesiveness.
Innovation Solution
A surface-treated steel sheet with particulate tin deposition, where tin is applied in the form of particles with an area ratio of 5-95% and an average particle size of 0.5-50µm, using a tin sulfate plating bath, allowing for improved adhesiveness and corrosion resistance by exposing iron and providing an anchor effect for the resin layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chromate-treated steel sheet is used to achieve excellent film adhesiveness during severe forming processes, then working adhesive properties are improved, but corrosion resistance deteriorates drastically when filled with highly acidic contents
Solution Approach 1:
The invention uses a composite surface treatment combining chromate coating and tin plating layers. The chromate layer provides excellent film adhesiveness for resin coating during severe forming processes, while the outer tin plating layer provides corrosion resistance against highly acidic contents. This composite structure resolves the contradiction by combining materials with complementary properties.
2Reliability
If tin plated steel sheet is used to achieve excellent corrosion resistance against highly acidic contents, then corrosion resistance is improved, but working adhesive properties deteriorate due to tin oxidized coating and low temperature coating limitations
Solution Approach 1:
The invention creates local quality differentiation by having the chromate layer primarily on the steel sheet surface for adhesiveness, while the tin plating layer covers the surface for corrosion resistance. The chromate layer is not completely removed but controlled to provide local adhesive promotion where needed, while tin provides overall corrosion protection.
Solution Approach 2:
The invention changes the coating parameters by applying chromate treatment before tin plating, creating a dual-layer structure. The chromate layer is applied at controlled conditions to provide anchor points for resin adhesion, while the subsequent tin plating is applied to provide corrosion resistance without the limitations of conventional tinplate coating temperatures.
3Strength
If silane coupling agents are applied on tin plated layer to improve resin adhesiveness, then film adhesiveness is improved, but manufacturing cost increases
Solution Approach 1:
The chromate layer serves as an intermediary between the steel sheet and the resin coating, providing chemical bonding sites that enhance resin adhesion without requiring additional silane coupling agents. This intermediary layer naturally promotes adhesion through its chemical properties, eliminating the need for costly additional treatments.
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 resin-coated steel sheet exhibits enhanced working adhesive properties, maintaining adhesiveness during severe forming processes and allowing high-temperature coating without resin separation, comparable to TFS, while reducing manufacturing costs through the use of sulfuric acid in the plating bath.
Implementation Method 1
a surface-treated steel sheet on which tin is discontinuously deposited in the form of particles... using a tin sulfate plating bath
Data Source
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AI summary
A resin-coated steel sheet exhibiting excellent adhesiveness of the resin even during a tough molding process. Specifically disclosed is a surface-treated steel sheet in the surface of which tin metal is discontinuously dispersed in the form of particles and iron of the steel sheet surface is partially exposed. The surface-treated steel sheet is characterized in that the particulate metal tin dispersed in the steel sheet accounts for 5-95% of the area of the steel sheet surface, the amount of tin is 0.1-13 g/m2 and the particulate metal tin has an average particle size of 0.5-50 µm. Also specifically disclosed is a resin-coated steel sheet which is characterized in that a resin layer is formed on the surface-treated steel sheet.