Laser-Textured Coating Base Material for Primer-Independent Durability
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Solution Overview
Problem
Chromic acid-based primers enhance coating durability but contain environmentally harmful hexavalent chromium, and alternative primers with lower environmental impact result in inferior adhesion strength and blister formation over time.
Innovation Solution
A coating base material with a crater-like recess on its surface, formed by laser machining, enhances adhesion strength by allowing the coating material to adhere to the bank portions of the recesses, thereby improving durability regardless of primer strength, and inhibiting blister formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chromic acid-based primer is used to enhance coating durability, then adhesion strength and durability are improved, but environmental harm increases due to hexavalent chromium content
Solution Approach 1:
The invention extracts and removes the harmful chromic acid-based primer from the coating system while preserving the desired durability function through an alternative mechanism based on physical surface structure rather than chemical adhesion promoters
Solution Approach 2:
The invention changes the surface topology parameters of the base material by forming crater-like recesses with specific depth ratios (not less than 1/5 of valley portion depth), transforming the adhesion mechanism from chemical to physical anchoring
2Object-affected harmful factors
If a polymer-based primer is used instead of chromic acid-based primer to reduce environmental impact, then environmental harm is reduced, but adhesion strength deteriorates and blisters occur in long-term use
Solution Approach 1:
The invention introduces an intermediary physical structure (crater-like recesses with bank portions) between the base material and coating material, mediating the adhesion function without requiring chemical primers
Solution Approach 2:
The invention transitions from a two-dimensional surface coating problem to a three-dimensional structural solution by forming depth-based recesses that provide volumetric anchoring for the coating material
3Strength
If only mesh-like valley portions and island portions are formed on the base material surface, then adhesion is improved, but durability is insufficient due to primer dependency
Solution Approach 1:
The invention segments the surface structure into multiple functional zones: mesh-like valley portions for general adhesion, island portions for localized anchoring, and crater-like recesses with bank portions for enhanced mechanical interlocking and primer-independent durability
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 coating base material significantly enhances adhesion strength and durability by allowing the coating material to adhere to the bank portions of the recesses, while preventing blister formation, thus providing long-term reliability without relying on strong primer adhesion.
Implementation Method 1
the valley portion and the island portions are formed by irradiation of the surface with a laser beam
Implementation Method 2
a coating material located at the inner side (recess side) and the outer side of a bank portion, which bulges on the peripheral edge of each recess, closely adheres to the bank portion so as to hold the inner side and the outer side of the bank portion by shrinkage stress generated when the coating material cures
Data Source
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AI summary
Provided is a coating base material (1) having an improved configuration capable of enhancing the durability of a coating regardless of the adhesion strength of a primer. A coating base material (1) whose surface is subjected to application of a coating includes: a mesh-like valley portion (2) formed on the surface; and a plurality of island portions (3) formed on the surface and surrounded by the valley portion (2). Each island portion (3) has a crater-like recess (4) formed on an upper surface thereof.