Brake Disk Coating Overlap Prevents Corrosion Creep
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Solution Overview
Problem
Brake disks for motor vehicles face issues with corrosion undermining surface coatings, leading to wear and detachment, as existing coatings often do not effectively prevent moisture penetration between wear-resistant and corrosion-resistant layers.
Innovation Solution
A brake disk design featuring a corrosion-resistant surface coating that overlaps with the wear-resistant coating on friction surfaces, covering adjacent areas and perforations, using different materials applied thermally or chemically to prevent corrosion penetration, ensuring the wear-resistant coating remains intact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a wear-resistant coating is applied to the friction surfaces of the brake disk, then wear resistance is improved, but corrosion can penetrate at the edges and undermine the coating
Solution Approach 1:
The patent applies different surface treatments to different areas of the brake disk: a wear-resistant coating on the friction surfaces and a corrosion-resistant coating on the adjacent surfaces and edges. This local differentiation ensures that each area has the specific protective property it needs, preventing corrosion from undermining the wear-resistant coating at the boundaries.
Solution Approach 2:
The patent uses composite surface treatment by combining two different types of coatings: a wear-resistant coating (such as ceramic or metal matrix composite) on the friction surfaces and a corrosion-resistant coating (such as zinc, nickel, or chromium plating) on the adjacent surfaces. This composite approach addresses both wear and corrosion protection simultaneously.
2Object-affected harmful factors
If a corrosion-resistant coating is applied to adjacent surfaces, then corrosion resistance is improved, but the coating may detach if it does not overlap with the wear-resistant coating
Solution Approach 1:
The patent merges the two coatings at the boundary regions by making them overlap. The wear-resistant coating and corrosion-resistant coating are applied such that they overlap at the edges of the friction surfaces, creating a continuous protective barrier that prevents moisture penetration and ensures reliable attachment of both coatings.
Solution Approach 2:
The patent applies preliminary corrosion protection to the adjacent surfaces before final assembly, ensuring that the corrosion-resistant coating is already in place and properly positioned to overlap with the subsequent wear-resistant coating application. This preliminary action prevents corrosion from starting at the edges before the wear-resistant coating is applied.
3Ease of manufacture
If the surface coating is limited only to friction surfaces, then manufacturing effort is reduced, but corrosion can undermine the coating at uncoated areas
Solution Approach 1:
The patent implements local quality by selectively applying different coatings to different areas: the wear-resistant coating is applied only to the friction surfaces where wear occurs, while the corrosion-resistant coating is applied to the adjacent surfaces and edges where corrosion is most likely to occur. This targeted approach balances manufacturing effort with comprehensive protection.
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 effectively prevents corrosion from undermining the wear-resistant coating, enhancing the durability and longevity of the brake disk by ensuring the surface coating remains attached and functional.
Implementation Method 1
a corrosion-resistant surface coating of surfaces of the brake disc that are attached to the friction surfaces or to the surface coating of the friction surfaces
Implementation Method 2
it can be applied thermally or cold, for example it can be a chemical or galvanic coating
Implementation Method 3
it can be applied thermally or cold, for example it can be a chemical or galvanic coating
Data Source
Figure 1
Figure 2~3
AI summary
A brake disk (1) for a disk brake in a motor vehicle comprises a coating (6) on the frictional surfaces (4) thereof, said coating (6) increasing wear resistance and corrosion resistance. In order to prevent the coating (6) from creeping because of corrosion, the adjoining surfaces are provided with an additional corrosion-resistant coating (7).