Absorption Cooling Working Material Without Chromium Corrosion Inhibitors
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Solution Overview
Problem
Existing absorption cooling machine working materials rely on chromium salts as corrosion inhibitors, which are environmental pollutants and subject to regulatory restrictions, necessitating a replacement that maintains corrosion protection without using hexavalent chromium.
Innovation Solution
A working material system comprising ammonia, methylamine, or dimethylamine as working agents, with sodium, potassium, or cesium hydroxide solutions and water glass as corrosion inhibitors, forming a protective layer that inhibits rust without consuming over time, suitable for use in absorption machines with carbonaceous steel components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chromium salts are used as corrosion inhibitors in absorption working materials, then corrosion protection is achieved, but environmental pollution and regulatory restrictions occur
Solution Approach 1:
The patent extracts and removes chromium salts from the absorption working material system, replacing them with alternative corrosion inhibitors such as water glass (sodium silicate) and other non-chromium based compounds. This extraction eliminates the harmful environmental effects of chromium while maintaining the essential corrosion protection function through the alternative inhibitors.
Solution Approach 2:
The patent changes the chemical composition parameters of the corrosion inhibitor from chromium-based compounds to silicon-based water glass and other non-chromium alternatives. This parameter change maintains the corrosion inhibition capability while eliminating the environmental pollution associated with chromium salts, particularly hexavalent chromium.
2Object-affected harmful factors
If chromium salts are replaced with alternative corrosion inhibitors, then environmental pollution is reduced, but corrosion protection effectiveness may be compromised
Solution Approach 1:
The patent introduces water glass (sodium silicate) and other alternative compounds as intermediary substances that perform the corrosion inhibition function previously fulfilled by chromium salts. These intermediaries form protective films on metal surfaces through different chemical mechanisms, ensuring continued corrosion protection without environmental harm.
Solution Approach 2:
The patent employs composite corrosion inhibition systems combining water glass with other non-chromium based compounds such as sodium hydroxide, potassium hydroxide, and various organic additives. This composite approach ensures comprehensive corrosion protection by leveraging the synergistic effects of multiple inhibitors, matching or exceeding the effectiveness of chromium salts while remaining environmentally friendly.
3Duration of action of stationary object
If water glass is used as corrosion inhibitor, then long-term protection is achieved, but precise composition control is required
Solution Approach 1:
The patent specifies precise compositional parameters for water glass including SiO2 content (26-30% by weight), Na2O content (7-8% by weight), and the ratio of water glass to water (0.5-5% by weight). These parameter specifications ensure optimal long-term corrosion protection while providing clear guidance for manufacturing control, balancing performance with manufacturability.
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 solution effectively replaces chromium salts with environmentally friendly alternatives, providing long-term corrosion protection and promoting the formation of a protective magnetite layer within absorption equipment, suitable for various applications including household and industrial refrigeration systems.
Implementation Method 1
forming a protective layer that inhibits rust without consuming over time
Implementation Method 2
promoting the formation of a protective magnetite layer within absorption equipment
Data Source
AI summary
Working material for absorption machines using ammonia (NH3) or methylamine (CH3NH2) or dimethylamine ((CH3)2NH) as the working agent and using water (H2O) as the solvent, to which a small amount of basic water glass is added, i.e., a certain mixture of water glass and bases, which does notcontain any chromium salts as corrosion inhibitors.