Cold-Rolled Titanium Plate Surface for Stable Coating Bonding
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Solution Overview
Problem
Existing methods fail to consistently provide titanium plates with excellent adhesiveness between the surface coating layer and the base material while maintaining workability and controlling treatment costs.
Innovation Solution
The titanium plate is processed using controlled cold rolling conditions, including specific reduction ratios and the use of dull rolls, to create uniform asperities on the surface, enhancing adhesiveness and workability without excessive cost increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface treatment methods (plating, coating) are applied to titanium plates, then various functional characteristics (corrosion resistance, conductivity, abrasion resistance) are improved, but adhesiveness between the coating layer and base material deteriorates due to the passive TiO2 film formation
Solution Approach 1:
The patent applies preliminary action by performing cold rolling with controlled reduction ratios (10-30% per pass, 30-80% total) before surface treatment to pre-form asperities on the titanium surface. This creates a roughened surface topology that enhances mechanical interlocking with subsequent coating layers, directly addressing the adhesiveness problem caused by the passive TiO2 film while maintaining the base material's functional characteristics
Solution Approach 2:
The patent employs parameter changes by precisely controlling cold rolling parameters (reduction ratio, number of passes, roll surface condition) to achieve optimal asperity formation. By adjusting these parameters, the surface roughness is optimized to improve coating adhesiveness without compromising the titanium's inherent corrosion resistance, conductivity, or other functional properties
2Use of energy by moving object
If hot-dip aluminum plating is performed on titanium beforehand to improve adhesiveness, then adhesiveness between coating layer and base material is improved, but treatment cost increases
Solution Approach 1:
The patent replaces expensive hot-dip aluminum plating with a cost-effective cold rolling process that forms asperities through mechanical deformation. This disposable-like approach uses the rolling process itself to create the necessary surface morphology without requiring additional costly plating materials or complex multi-step treatment procedures, significantly reducing treatment costs while achieving comparable or superior adhesiveness
Solution Approach 2:
The patent extracts the essential function of improving adhesiveness from the complex hot-dip plating process and achieves it through a simpler cold rolling operation. By separating the surface preparation function from the coating application, the patent eliminates the need for expensive aluminum plating while maintaining effective coating adhesion through mechanically formed asperities
3Use of energy by moving object
If graphite is pressure-bonded to the base material to perform physical graphite coating, then adhesiveness is improved, but device complexity increases
Solution Approach 1:
The patent merges the surface preparation function into the existing cold rolling process by using the roll surface itself to create asperities during normal rolling operations. This eliminates the need for separate graphite pressure-bonding equipment and processes, reducing device complexity while achieving effective surface roughening for improved coating adhesion through the integrated rolling operation
4Reliability
If titanium carbonitride is formed on the surface through cold working and annealing to improve corrosion resistance, then corrosion resistance is improved, but surface uniformity deteriorates due to irregular cracking
Solution Approach 1:
The patent applies parameter changes by precisely controlling the cold rolling reduction ratio (10-30% per pass, 30-80% total) and number of passes to achieve uniform asperity formation without excessive cracking. This controlled deformation approach creates consistent surface topology that maintains both corrosion resistance through titanium carbide/nitride formation and surface uniformity required for even coating distribution
Solution Approach 2:
The patent applies partial action by using moderate cold rolling reduction ratios rather than excessive deformation. This controlled approach forms sufficient asperities for good coating adhesion and uniform carbide/nitride distribution without causing irregular cracking that would compromise surface uniformity, achieving the optimal balance between surface modification and structural integrity
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 results in a titanium plate with improved adhesiveness and workability, as evidenced by controlled surface roughness, asperity density, and spacing, leading to effective coating film adherence and reduced surface defects.
Implementation Method 1
an aluminum plate or an alloy plate of aluminum as a base material, surface treatment is performed in the same manner as in the invention disclosed in Patent Document 5, that is, by cold working
Implementation Method 2
Patent Document 4 discloses an invention in which titanium carbonitride is formed on a surface through cold working and annealing, to thereby improve a corrosion resistance
Implementation Method 3
by making the titanium plate to be subjected to plating of resin or metal such as Ni having a resistance to alkali corrosion
Data Source
AI summary
A titanium plate includes a chemical composition of industrial pure titanium, in which an arithmetic mean roughness Ra of a surface is 0.05 μm or more and 0.40 μm or less, the surface has titanium carbide regarding which a ratio between a total sum of integrated intensities Ic derived from the titanium carbide and a total sum of integrated intensities Im of all diffraction peaks derived from the titanium carbide and titanium obtained from X-ray diffractometry ((Ic/Im)×100) is 0.8% or more and 5.0% or less, a number density of asperities on the surface is 30 to 100 pieces/mm, and an average spacing of the asperities is 20 μm or less.