Alkaline Cleaning Composition for Metal Substrates
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Solution Overview
Problem
Metals like aluminum and their alloys corrode rapidly in the presence of water due to low oxidation-reduction potential, and conventional cleaning methods often produce smut, require multiple steps, and fail to provide adequate adhesion for coatings, leading to increased maintenance costs and environmental pollution.
Innovation Solution
Aqueous composition comprising a hydroxide anion, phosphate anion, and a corrosion inhibitor such as a zinc salt or azole compound, along with rare earth and alkaline earth metal ions, applied to a metal substrate to enhance corrosion resistance and adhesion without producing smut and reducing the number of cleaning steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cleaning methods are used on metal substrates, then greases and oils are removed, but smut is produced and coating adhesion is poor
Solution Approach 1:
The patent combines multiple cleaning functions into a single alkaline cleaning composition that simultaneously removes organic contaminants and prevents smut formation. The composition integrates surfactants for grease removal with corrosion inhibitors and chelating agents that prevent metal oxide formation, eliminating the need for separate cleaning and smut removal steps while ensuring proper coating adhesion.
Solution Approach 2:
The patent converts the harmful alkaline corrosion that typically produces smut into a beneficial process by controlling the pH and adding specific inhibitors. The alkaline environment effectively removes organic contaminants while the corrosion inhibitors prevent unwanted metal oxide formation, transforming a potentially harmful side effect into a controlled cleaning mechanism that improves coating adhesion.
2Reliability
If multiple cleaning steps are used to clean metal substrates, then thorough cleaning is achieved, but process time and complexity increase
Solution Approach 1:
The patent merges multiple cleaning functions into a single comprehensive cleaning composition and process. The alkaline cleaning composition simultaneously performs degreasing, smut removal, and surface activation in one step, eliminating the need for sequential cleaning operations while maintaining thorough cleaning effectiveness.
Solution Approach 2:
The cleaning composition is designed with multi-functionality to handle various types of contaminants (organic and inorganic) and prepare the surface for different types of coatings. The formulation includes surfactants, alkaline agents, corrosion inhibitors, and chelating agents that work together to provide comprehensive cleaning and surface preparation in a single universal solution.
3Reliability
If elevated temperature solutions are used for cleaning, then cleaning effectiveness is improved, but energy consumption and cost increase
Solution Approach 1:
The patent changes the chemical parameters of the cleaning solution by using a carefully formulated alkaline composition with optimized pH, surfactant concentration, and additive ratios. This chemical optimization allows the cleaning process to be effective at lower temperatures, reducing energy consumption while maintaining cleaning effectiveness through enhanced chemical reactivity and surface activity.
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 effectively prevents corrosion and improves coating adhesion on metal substrates, reducing maintenance costs and environmental impact by eliminating the need for multiple cleaning steps and elevated temperatures.
Implementation Method 1
a corrosion inhibitor in said aqueous carrier, said corrosion inhibitor forming a protective film on said metal substrate
Implementation Method 2
aqueous carrier, a hydroxide anion, a phosphate anion
Implementation Method 3
conventional cleaners can often produce smut when the substrate is cleaned
Data Source
AI summary
A composition for application to a metal substrate comprises an aqueous carrier, a hydroxide anion and/or a phosphate anion, and a corrosion inhibitor comprising an azole compound, a rare earth ion, an alkali earth metal ion, and/or a transition metal ion. A substrate or article includes the composition for application to a metal substrate and a coating on the composition. A method of fabricating a substrate comprises applying the composition to a substrate, allowing the composition to dry to form a dried composition, and applying a coating on the dried composition.