Heated Metal Surface Rust-Proofing With Inorganic Salt Treatment
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Solution Overview
Problem
Conventional rustproofing methods do not achieve high enough rust proof performance and are not easily applicable to metal or alloy surfaces.
Innovation Solution
A rustproofing method involving treatment with an aqueous solution containing inorganic acids or salts, such as silicic acid, silicate, phosphoric acid, and zirconium salt, at elevated temperatures above 180°C, optionally with a lubricant, to enhance rust proof performance on metal or alloy surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rustproofing methods using metal particles or nanoparticles are applied, then some corrosion protection is achieved, but higher rust proof performance is not attained and the process becomes complex
Solution Approach 1:
The invention changes the temperature parameter by heating the metal surface to 180°C or higher before applying the aqueous solution. This temperature parameter change enables the formation of a protective oxide layer that significantly enhances rust proof performance, resolving the contradiction between achieving high reliability and maintaining process simplicity.
Solution Approach 2:
The invention creates a composite structure by forming an oxide layer (such as zinc oxide) on the metal surface through thermal treatment, then applying an aqueous solution containing inorganic acids or salts. This composite approach—combining thermal oxidation with chemical treatment—achieves superior corrosion protection without requiring complex multi-step processes involving metal particles or nanoparticles.
2Reliability
If conventional rustproofing treatments are applied at room temperature, then the process is simple, but rust proof performance is insufficient
Solution Approach 1:
The invention deliberately changes the temperature parameter from room temperature to 180°C or higher during the treatment process. This temperature elevation activates the formation of protective oxide layers on the metal surface, which are essential for achieving high rust proof performance. The heated state enables better penetration and reaction of the aqueous solution with the metal surface.
3Reliability
If high-temperature post-treatment processes are used to improve rust proof performance, then corrosion resistance is enhanced, but additional heating steps are required
Solution Approach 1:
The invention merges the heating step with the aqueous solution application step into a single integrated process. The metal surface is heated to 180°C or higher, and the aqueous solution is applied during this heated state, allowing the oxide layer formation and chemical treatment to occur simultaneously. This eliminates the need for separate high-temperature post-treatment processes, maintaining high corrosion resistance while improving productivity.
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 method significantly improves rust proof performance on metal and alloy materials, extending corrosion resistance in salt spray tests without requiring high-temperature post-treatment processes.
Implementation Method 1
treating an object to be treated, which contains a metal or an alloy or has on a surface a film or a layer containing a metal or an alloy, and has been heated to a temperature above 180° C., with an aqueous solution containing an inorganic acid or an inorganic salt
Data Source
AI summary
The present invention relates to: a rust-proofing treatment method comprising the step of treating an object that comprises a metal or an alloy and is heated to a temperature higher than 180° C. or an object that has, formed on the surface thereof, a film or layer comprising a metal or an alloy and is heated to a temperature higher than 180° C. with an aqueous solution containing an inorganic acid or an inorganic salt, or comprising the step of treating an object comprising a metal or an alloy or an object having, formed on the surface thereof, a film or layer comprising a metal or an alloy with an aqueous solution containing at least one component selected from silicic acid, a silicic acid salt, phosphoric acid, a phosphoric acid salt, a monohydrogen phosphate salt, a dihydrogen phosphate salt and a zirconium salt; and an article characterized by being rust-proofing-treated by the rust-proofing treatment method.