Heat Transfer Fluid Corrosion Inhibitor Formulation
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Solution Overview
Problem
Modern vehicle engines require heat transfer fluids that provide efficient corrosion protection for cooling system metals, prevent freezing and boiling, and maintain heat transfer efficiency, while also being compatible with non-metallic components and environmentally friendly, especially in new cooling systems with heat exchangers produced by controlled atmosphere brazing.
Innovation Solution
A heat transfer fluid composition comprising a freezing point depressant, aliphatic carboxylic acid or its salt, inorganic phosphate, magnesium compound, and components such as azole compounds, phosphonocarboxylates, and phosphinocarboxylates, which offers improved corrosion protection and stability, meeting ASTM D3306 requirements and being free of nitrite, ammonium ions, and ammonia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heat transfer fluids are used, then basic cooling function is provided, but corrosion protection is insufficient and scale/deposit formation occurs
Solution Approach 1:
The patent applies composite corrosion inhibitor formulations combining multiple active ingredients (carboxylic acids, phosphonates, silicates, borates) in specific concentration ranges. This composite approach provides synergistic corrosion protection while preventing scale and deposit formation, resolving the contradiction between reliability and harmful factor generation.
Solution Approach 2:
The patent specifies precise parameter ranges for each inhibitor component (e.g., carboxylic acid: 0.01-5 wt%, phosphonate: 0.01-5 wt%, silicate: 0.1-5 wt%, borate: 0.1-5 wt%) to optimize both corrosion protection and prevent deposit formation. By controlling these chemical parameters within defined ranges, the formulation achieves reliable corrosion protection without generating harmful scale and deposits.
2Reliability
If corrosion inhibitors are added to protect metals, then corrosion protection improves, but heat transfer efficiency may be reduced due to fluid property changes
Solution Approach 1:
The patent carefully controls the concentration parameters of each inhibitor component to maintain optimal heat transfer properties. By limiting inhibitor concentrations to specific ranges (e.g., total inhibitor content kept moderate), the formulation provides adequate corrosion protection while minimizing impacts on thermal conductivity, specific heat, and viscosity that would otherwise reduce heat transfer efficiency.
Solution Approach 2:
The patent uses different inhibitor components with specialized functions: carboxylic acids and phosphonates for metal surface protection, silicates and borates for water quality stabilization. This localized functional assignment ensures corrosion protection where needed while maintaining bulk fluid properties essential for heat transfer efficiency.
3Reliability
If multiple corrosion inhibitor components are combined, then comprehensive metal protection is achieved, but formulation complexity increases
Solution Approach 1:
The patent combines multiple inhibitor components (carboxylic acids, phosphonates, silicates, borates) into a single comprehensive formulation that provides broad-spectrum corrosion protection for various cooling system metals. While the formulation is composite, each component serves a specific protective function, and the combined effect achieves comprehensive protection without requiring complex multi-step application procedures.
Solution Approach 2:
The multi-component inhibitor formulation serves multiple functions simultaneously: protecting ferrous and non-ferrous metals, stabilizing water quality, preventing scale formation, and maintaining fluid properties. This universal protection approach simplifies the overall cooling system maintenance by providing all necessary corrosion protection functions in a single fluid additive package.
4Temperature
If traditional coolant formulations are used, then basic freeze protection is provided, but long-term stability and material compatibility are insufficient
Solution Approach 1:
The patent combines traditional freeze protection components (glycol or propylene glycol as base) with multiple corrosion inhibitor systems (carboxylic acids, phosphonates, silicates, borates). This composite formulation maintains the freeze protection function while adding long-term stability through synergistic interactions between components that prevent degradation and maintain material compatibility over extended service periods.
Solution Approach 2:
The patent uses inhibitor concentrations at the lower end of effective ranges (e.g., 0.01-5 wt% for each component) to provide adequate protection without excessive amounts that could cause instability or compatibility issues. This partial action approach achieves sufficient long-term stability and material compatibility while maintaining formulation simplicity and cost-effectiveness.
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 fluid provides enhanced corrosion protection for metals in automotive cooling systems, maintains heat transfer efficiency, and reduces foam tendency, ensuring long-term stability and compatibility with various materials, thus preventing engine overheating and failure.
Implementation Method 1
a freezing point-depressant
Implementation Method 2
transferring excess heat from the engine to the radiator for dissipation
Implementation Method 3
provide efficient heat transfer
Data Source
Figure 1~2
AI summary
Disclosed herein is a heat transfer fluid comprises: a freezing point-depressant; an aliphatic carboxylic acid, a salt thereof, or a combination of the foregoing; an inorganic phosphate; a magnesium compound; deionized water; and a component selected from the group consisting of azole compounds, copper alloy corrosion inhibitors, phosphonocarboxylates, phosphinocarboxylates, and combinations of two or more of the foregoing components. Also described is a heat transfer system comprising the heat transfer fluid.