Metal Pretreatment Agent for Corrosion Resistance and Adhesion
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Solution Overview
Problem
Metal materials with chemical conversion coatings formed using existing methods often exhibit insufficient corrosion resistance and paint film adhesion, particularly at edges, and may not perform well across different types of metal materials.
Innovation Solution
A pretreatment agent comprising metal alkoxides and sulfonic acids, along with alkoxysilyl group-containing organosilane compounds, is used to enhance the corrosion resistance and adhesion of paint films on metal materials by forming a chemical conversion coating, which improves edge burr protection and overall corrosion resistance regardless of the metal type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a chemical conversion coating is formed on metal surface using conventional treatment agents, then the metal material gains some corrosion resistance, but the corrosion resistance at edges and paint film adhesion remain insufficient
Solution Approach 1:
The patent applies a preliminary treatment step before chemical conversion treatment to specifically address edge burrs. This pretreatment creates a controlled surface condition at edges that enhances both corrosion resistance and paint adhesion in subsequent steps, resolving the insufficiency of conventional single-step treatments.
Solution Approach 2:
The treatment agent is designed to provide different functional properties at different locations: edge burr protection at edges and general corrosion resistance on flat surfaces. The chemical composition and application conditions are optimized to create localized enhancement at edges while maintaining overall coating performance.
2Reliability
If a chemical conversion coating is formed on metal surface, then corrosion resistance is improved, but paint film adhesion remains insufficient
Solution Approach 1:
A preliminary treatment step is implemented before chemical conversion treatment to prepare the surface for optimal paint adhesion. This pretreatment creates surface conditions that enhance both corrosion resistance and subsequent paint film bonding, addressing the adhesion insufficiency of conventional treatments.
Solution Approach 2:
The treatment system uses a composite approach combining multiple chemical components and treatment stages to achieve both corrosion resistance and paint adhesion. The multi-component treatment agent and sequential treatment steps create a synergistic effect that simultaneously improves both properties.
3Ease of manufacture
If conventional chemical conversion treatment is applied to different metal materials, then treatment can be performed, but performance varies depending on metal type
Solution Approach 1:
The treatment agent and method are designed to be universally applicable across different metal materials (steel, aluminum, zinc alloys, etc.). The chemical composition and treatment conditions are optimized to achieve consistent corrosion resistance and paint adhesion performance regardless of the specific metal type, eliminating the need for separate treatment protocols.
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 effectively improves the corrosion resistance and adhesion of paint films on metal materials, particularly at edges, and ensures excellent corrosion resistance across various metal types, enhancing the durability and reliability of the metal surfaces.
Implementation Method 1
a pretreatment agent that is used in a pretreatment of a chemical conversion treatment performed for forming a chemical conversion coating on/over a surface of a metal material
Implementation Method 2
at least one alkoxysilyl group-containing organosilane compound (C)
Data Source
AI summary
The present invention addresses the problem of providing, a metal surface treatment agent capable of exhibiting excellent corrosion resistance and excellent coating adhesion in painted metal materials; and a metal surface treatment method using the metal surface treatment agent. The problem is solved by a pretreatment agent that is used in a pretreatment of a chemical conversion treatment performed for forming a chemical conversion coating on/over a surface of a metal material, the pretreatment agent containing: a metal alkoxide (A) containing at least one metal element selected from zirconium, titanium, vanadium, and aluminum; and at least one sulfonic acid (B) selected from methanesulfonic acid, ethanesulfonic acid, hydroxymethanesulfonic acid, and hydroxyethanesulfonic acid. The problem is also solved by a chemical conversion treatment agent that contains a zirconium alkoxide (a) and a zirconium-containing ion supply source (b), and has a pH of 1.5 to 6.5.