Nitrite-Free Solid Coolant Concentrates for Ferrous Corrosion
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Solution Overview
Problem
Current solid coolant mixtures containing aliphatic monocarboxylic acids for corrosion inhibition in ferrous materials are tacky and unsuitable for solid use forms, complicating storage and transport due to their sticky nature, and often include nitrites, which are toxic.
Innovation Solution
Development of nitrite-free solid coolant compositions with limited aliphatic monocarboxylic acid content, comprising inorganic corrosion inhibitors, aromatic monocarboxylic acids, organic dicarboxylic acids, azoles, and inorganic bases, formulated to be stable and non-tacky, allowing easy conversion to solid forms and minimal toxicological concern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aliphatic monocarboxylic acids are used as corrosion inhibitors, then corrosion inhibition of ferrous materials is improved, but the mixture becomes tacky and cannot be converted to solid use form
Solution Approach 1:
The patent changes the chemical composition parameters by replacing aliphatic monocarboxylic acids with a combination of inorganic corrosion inhibitors (silicates, borates, nitrates, molybdates, phosphates) and aromatic carboxylic acids. This parameter change eliminates the tackiness issue while maintaining corrosion inhibition effectiveness, enabling conversion to stable solid formulations.
Solution Approach 2:
The patent creates a composite inhibitor system combining multiple inorganic compounds (silicates, borates, nitrates, molybdates, phosphates) with aromatic carboxylic acids and azoles. This composite approach provides corrosion protection through multiple mechanisms while avoiding the tackiness problem of pure aliphatic monocarboxylic acids, allowing solid formulation.
2Reliability
If nitrites are used as corrosion inhibitors, then corrosion inhibition of ferrous materials is improved, but toxicity increases
Solution Approach 1:
The patent extracts and removes nitrites from the corrosion inhibitor formulation, replacing them with non-toxic inorganic compounds (silicates, borates, nitrates, molybdates, phosphates) and organic alternatives (aromatic carboxylic acids, azoles). This extraction eliminates the toxicity problem while maintaining corrosion protection functionality.
Solution Approach 2:
The patent substitutes toxic nitrites with safer, environmentally friendly alternatives that may have shorter persistence or different degradation pathways. The use of biodegradable organic acids and naturally occurring inorganic minerals provides a safer profile while achieving the same protective function.
3Quantity of substance
If concentrates are produced to reduce water content, then transportation volumes are reduced, but production complexity increases
Solution Approach 1:
The patent prepares all corrosion inhibitor components (inorganic salts, aromatic carboxylic acids, azoles) in their concentrated, stable solid forms in advance during manufacturing. This preliminary concentration and stabilization eliminates the need for complex water removal processes at the point of use, simplifying the overall production system while achieving maximum concentration for reduced transportation volumes.
Data Source
AI summary
The present invention describes novel coolant concentrates and the production and use thereof.