Zinc-Plated Steel Sheet Oxide Coating for Hot-Press Adhesion
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Solution Overview
Problem
Zinc-based plated steel sheets often experience poor post-coating adhesiveness due to insufficient chemical conversion treatment, particularly when aluminum is present in the hot-dip galvanizing layer, leading to reduced corrosion resistance and adhesion issues in applications like automotive components.
Innovation Solution
A zinc-based plated steel sheet with a surface treatment layer containing titanium oxide, nickel oxide, or tin(IV) oxide, along with phosphorus-containing compounds, vanadium-containing compounds, or chromium-containing compounds, to enhance coating film adhesiveness and corrosion resistance, even under conditions of insufficient chemical conversion treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a zinc-based plated steel sheet is used for hot pressing, then productivity is improved and scale formation is prevented, but post-coating adhesiveness deteriorates due to insufficient chemical conversion treatment
Solution Approach 1:
A surface treatment layer containing specific metal oxides (titanium oxide, nickel oxide, or tin(IV) oxide) with controlled particle sizes (2-100 nm) and attached amounts (0.01-1.0 g/m²) is formed on the zinc-based plated steel sheet before hot pressing. This preliminary surface treatment ensures adequate chemical conversion treatment capability while maintaining the productivity benefits of zinc-based plating, thereby improving post-coating adhesiveness without sacrificing production efficiency.
2Reliability
If the thickness of Zn oxide layer is reduced or removed by shot blasting, then coating film adhesiveness is improved, but additional processing steps are required reducing productivity
Solution Approach 1:
Instead of removing or reducing the Zn oxide layer through additional processing steps like shot blasting, the invention forms a surface treatment layer containing specific metal oxides (titanium oxide, nickel oxide, or tin(IV) oxide) with controlled particle sizes and attached amounts before hot pressing. This preliminary action provides adequate chemical conversion treatment capability, improving coating film adhesiveness while avoiding the need for additional productivity-reducing processing 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
The proposed solution significantly improves coating film adhesiveness and corrosion resistance, ensuring strong adhesion between the steel sheet and electrodeposition coating films, even when chemical conversion treatment is inadequate, thereby enhancing the performance of zinc-based plated steel sheets in hot pressing applications.
Implementation Method 1
a surface treatment layer which contains one or more oxides selected from titanium oxide, nickel oxide, and tin(IV) oxide
Implementation Method 2
the surface treatment layer contains one or more oxides selected from titanium oxide, nickel oxide, and tin(IV) oxide each having a particle size of more than or equal to 2 nm and less than or equal to 100 nm, in a range of more than or equal to 0.01 g/m2 and less than or equal to 1.0 g/m2
Implementation Method 3
plated steel sheets based on zinc (Zn), which has a sacrificial anti-corrosion action on the steel sheet
Implementation Method 4
the surface of the steel sheet is oxidized by the steel sheet being heated to a high temperature of 800°C or more, and scales (compounds) are produced
Implementation Method 5
a material to be molded is once heated to high temperature, the steel sheet softened by heating is pressed to be molded
Implementation Method 6
the mechanical strength of the material can be enhanced by the quenching effect by the cooling after molding
Data Source
AI summary
[Object] To provide a zinc-based plated steel sheet excellent in coating film adhesiveness after hot pressing more conveniently. [Solution] A zinc-based plated steel sheet according to the present invention comprises: a zinc-based plated steel sheet that is a base metal; and a surface treatment layer formed on at least one surface of the zinc-based plated steel sheet, in which the surface treatment layer contains one or more oxides selected from titanium oxide, nickel oxide, and tin(IV) oxide each having a particle size of more than or equal to 2 nm and less than or equal to 500 nm, in a range of more than or equal to 0.2 g/m2 and less than or equal to 2 g/m2 per one surface.