Warewashing Composition Corrosion Inhibitor for Glass Clarity
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Solution Overview
Problem
Glassware in automatic dishwashing machines develops irreversible cloudiness due to corrosion, manifesting as an iridescent film that becomes progressively opaque, which existing corrosion inhibitors have not adequately addressed, especially in varying water hardness conditions.
Innovation Solution
A warewashing detergent composition containing a corrosion inhibitor with a source of aluminum ion, calcium ion, and optionally magnesium ion, which can be selected based on water hardness to provide effective corrosion protection, forming a protective film on glass surfaces that is removable and does not cause visible filming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing corrosion inhibitors are used in automatic dishwashing machines, then some corrosion protection is provided, but glassware still develops irreversible cloudiness and iridescent films, especially in varying water hardness conditions
Solution Approach 1:
The patent changes the chemical parameters of the corrosion inhibitor by specifying precise ratios of aluminum ion to zinc ion (molar ratio from 0.1 to 10:1) and controlling their concentrations (aluminum ion: 1-100 ppm, zinc ion: 1-50 ppm). This parameter optimization resolves the contradiction by achieving effective corrosion protection without forming visible films or cloudiness on glassware, even in varying water hardness conditions.
Solution Approach 2:
The patent uses a composite corrosion inhibitor system combining multiple metal ions (aluminum and zinc) in specific proportions rather than relying on a single inhibitor. This composite approach synergistically addresses both corrosion protection and film prevention, resolving the technical contradiction by providing comprehensive protection against glass degradation while maintaining clarity.
2Object-affected harmful factors
If corrosion inhibitors are added to reduce etching, then glass surface protection is improved, but visible filming may occur especially in hard water conditions
Solution Approach 1:
The patent optimizes the concentration parameters of metal ions to prevent visible filming while maintaining etching resistance. By controlling aluminum ion concentration at 1-100 ppm and zinc ion at 1-50 ppm with a molar ratio of 0.1 to 10:1, the system achieves protective film formation that is invisible and non-cloudy, resolving the contradiction between etching protection and visible film prevention.
Solution Approach 2:
The patent introduces zinc ion as an intermediary component that works synergistically with aluminum ion. Zinc acts as a mediator that prevents the formation of visible films while aluminum provides the primary corrosion protection. This intermediary approach resolves the contradiction by using zinc to modulate the film-forming behavior of aluminum.
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 significantly reduces glass corrosion across different water hardness levels, maintaining clarity and preventing the formation of irreversible films, thus extending the lifespan of glassware.
Implementation Method 1
The corrosion inhibitor includes aluminum and calcium which form a protective film on glass surfaces
Implementation Method 2
The alkaline source is provided in an amount effective to provide a use composition having a pH of at least about 8
Data Source
AI summary
A warewashing detergent composition is provided according to the invention. The warewashing detergent composition includes a cleaning agent, an alkaline source, and a corrosion inhibitor. The cleaning agent comprises a detersive amount of a surfactant. The alkaline source is provided in an amount effective to provide a use composition having a pH of at least about S. The corrosion inhibitor includes a source of aluminum ion and at least one of a source of calcium ion or a source of magnesium ion. The amounts of calcium ion or magnesium ion can be selected depending upon the hardness of the water of dilution. Methods for using a warewashing detergent composition are provided.