Coated Titanium Material with Ti-Based Oxide Interface
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Titanium materials with complex shapes face challenges in coating adhesion due to insufficient shot blasting, leading to decreased coating film adhesion and peeling strength, especially when using cation electrodeposition methods, which struggle with conductivity and uniformity, and acrylic resin-based coatings lack heat and solvent resistance.
Innovation Solution
A coated titanium material with a Ti-based oxide interface, including rutile type TiO2 and Ti2O3, and a modified epoxy resin electrodeposition coating film, where a Ti-containing compound with Fe, C, O, and N is applied to enhance adhesion and peeling strength, with a specific area percentage and Raman spectroscopy-verified composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If shot blasting is used to improve coating adhesion on titanium surfaces, then coating adhesion is improved, but the method cannot sufficiently reach complicated shapes leading to decreased adhesion in those areas
Solution Approach 1:
The patent replaces mechanical shot blasting with chemical anodization to create a porous oxide film on the titanium surface. This chemical process can uniformly treat complicated shapes and hard-to-reach areas, eliminating the mechanical limitations of shot blasting while maintaining coating adhesion through the formed porous structure.
Solution Approach 2:
The patent changes the surface treatment mechanism from mechanical impact (shot blasting) to electrochemical reaction (anodization). By controlling anodization parameters such as electrolyte composition, voltage, and treatment time, the porous oxide film structure can be optimized to provide both adhesion improvement and uniform coverage on complex geometries.
2Strength
If anodization is performed to form a porous oxide film, then coating adhesion is improved, but the oxide film has low conductivity causing insufficient electric current flow in electrodeposition coating
Solution Approach 1:
The patent introduces a chemical conversion film as an intermediary layer between the anodized porous oxide film and the electrodeposition coating. This intermediate layer serves as a conductive bridge that allows electric current to flow uniformly through the low-conductivity porous oxide structure, enabling successful electrodeposition coating while preserving the adhesion benefits of anodization.
Solution Approach 2:
The patent creates a composite surface structure combining the porous oxide film (providing adhesion) with a chemical conversion film layer (providing conductivity). This multi-layer composite structure leverages the complementary properties of each layer to simultaneously achieve both coating adhesion and electrical conductivity for electrodeposition.
3Ease of manufacture
If acrylic resin-based electrodeposition coating is applied, then coating film is formed, but heat resistance and solvent resistance are insufficient
Solution Approach 1:
The patent changes the resin type from acrylic to modified epoxy resin, fundamentally altering the coating material's chemical properties. This material substitution provides inherent superior heat resistance and solvent resistance while maintaining compatibility with the anodized titanium surface through the chemical conversion film interface.
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 solution achieves excellent coating film adhesion and peeling strength, comparable to steel materials, by ensuring uniform electrodeposition and improved surface properties through the Ti-containing compound, enhancing the coating process for titanium materials with complex shapes.
Implementation Method 1
a Ti-based oxide is included in an interface between the titanium material and the coating film
Implementation Method 2
an electric current is allowed to flow between a metallic material and an electrode plate in a liquid of coating material of an electrodeposition coating film
Implementation Method 3
a peak in a range of 320 to 350 cm−1 in a spectrum obtained by Raman spectroscopy
Data Source
AI summary
A coated titanium material includes a titanium material and a coating film formed on a surface of the titanium material. A Ti-based oxide is included in an interface between the titanium material and the coating film. The Ti-based oxide is one or both rutile type TiO2 and Ti2O3. In a case where a cut surface of the coating film is formed by using a SAICAS method under conditions that a horizontal speed is 2 μm/s and a vertical speed is 0.1 μm/s, on the cut surface, an area percentage of the Ti-based oxide is 30.0% or more in a region having a distance of 15 μm from a reference line specified on the basis of a boundary line, which is an intersection line between the cut surface and the interface, to a coating film side.