Zirconium-Titanium Organosiloxane Metal Surface Treatment
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Solution Overview
Problem
Current metal surface treatment compositions, particularly those using zirconium and titanium compounds, face challenges in achieving improved base metal concealing properties, coating film adhesiveness, and corrosion resistance while maintaining storage stability, especially in large-scale applications like automobile bodies, where they are used in oversized treatment baths.
Innovation Solution
A metal surface treatment composition comprising a zirconium and/or titanium compound combined with an organosiloxane, which is a polycondensate of organosilane with at least two amino groups, having a specific degree of polycondensation and branched structures, along with a fluorine compound and an oxidizing agent, to form a chemical conversion coating film with enhanced adhesiveness and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a zinc phosphate treatment agent is used to improve coating film adhesiveness, then the adhesiveness between coating film and metal surface is improved, but sludge generation increases and disposal costs rise
Solution Approach 1:
The invention extracts and eliminates phosphate ions from the treatment composition while retaining the essential function of improving coating adhesiveness. The zinc phosphate treatment agent is replaced with a composition containing zinc ions and specific organic acids (succinic acid, glutaric acid, or adipic acid) that do not generate water-insoluble salt precipitates, thus preventing sludge formation while maintaining adhesion promotion capabilities.
Solution Approach 2:
The invention changes the chemical parameters of the treatment composition by substituting phosphate ions with organic acid anions (succinate, glutarate, or adipate). This parameter change transforms the chemistry from one that generates insoluble zinc phosphate precipitates to one that forms soluble or easily removable organic acid salts, eliminating sludge generation while preserving the ability to enhance coating adhesiveness through chemical conversion coating formation.
2Reliability
If phosphate ions are added to improve corrosion resistance and adhesiveness, then the protective properties are enhanced, but environmental pollution through eutrophication occurs
Solution Approach 1:
The invention removes phosphate ions from the treatment composition entirely, replacing them with organic acid anions derived from succinic acid, glutaric acid, or adipic acid. This extraction eliminates the source of phosphorus that causes eutrophication in water bodies, while the replacement organic acids provide equivalent or superior corrosion protection without environmental harm.
Solution Approach 2:
The invention converts potentially harmful phosphate ions into beneficial organic acid-based alternatives. The organic acids (succinic, glutaric, or adipic acid) and their anions provide the necessary chemical conversion coating formation and corrosion protection functions while being environmentally benign, thus turning a harmful substance into a beneficial one.
3Manufacturing precision
If surface adjustment is performed to improve treatment uniformity, then the quality of chemical conversion coating is enhanced, but the total treatment process time is prolonged
Solution Approach 1:
The invention merges the surface adjustment function and the chemical conversion coating treatment into a single integrated process. The treatment composition contains zinc ions combined with organic acid anions that work synergistically to both adjust the surface chemistry and form the protective coating in one step, eliminating the need for separate surface adjustment pretreatment and reducing total process time.
Solution Approach 2:
The treatment composition achieves multiple functions simultaneously: it acts as both a surface adjuster and a chemical conversion coating agent. The combination of zinc ions with organic acid anions (succinate, glutarate, or adipate) provides unified action that prepares the surface and forms the protective coating in a single treatment bath, eliminating the need for sequential surface adjustment steps.
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 composition provides improved base metal concealing properties, coating film adhesiveness, and corrosion resistance, while also ensuring excellent storage stability, reducing the need for frequent composition replacement and minimizing sludge generation.
Implementation Method 1
the metal surface is subjected to chemical conversion treatment (surface treatment) for chemically forming a chemical conversion coating film
Implementation Method 2
the amino group-containing silane coupling agent improves the adhesiveness between a chemical conversion coating film and a coating film by acting not only on the surface of the metal material, but also on the coating film formed after chemical conversion treatment
Implementation Method 3
a metal surface treatment composition comprising a zirconium and/or titanium compound combined with an organosiloxane, which is a polycondensate of organosilane with at least two amino groups, having a specific degree of polycondensation and branched structures, along with a fluorine compound and an oxidizing agent
Data Source
AI summary
Disclosed is a composition for metal surface treatment which enables to form a chemical conversion coating film which achieves sufficient foundation surface concealment, coating adhesion and corrosion resistance. Also disclosed are a metal surface treatment method, and a metal material. Specifically disclosed is a composition for metal surface treatment containing a zirconium compound and/or a titanium compound, and an organosiloxane which is a polycondensation product of an organosilane and has at least two amino groups in a molecule. The polycondensation rate of the organosiloxane represented by the mathematical formula (1) below is not less than 40%. The content of the zirconium compound and/or titanium compound in the metal surface treatment composition and the organosiloxane content in the metal surface treatment composition are at predetermined values, while the mass ratio of the zirconium element and/or titanium element contained in the zirconium compound and/or titanium compound relative to the silicon element contained in the organosiloxane is at a predetermined value. Polycondensation Rate % = Mass of Organosiloxane × 100/(Mass of unreacted Organosilane + Mass of Organosiloxane) (1)