Coolant Silicophosphonate Stabilizes Aluminum Corrosion Inhibitors
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Solution Overview
Problem
Existing coolants with inorganic silicates suffer from deteriorating anticorrosive activity during storage, leading to reduced effectiveness against aluminum corrosion.
Innovation Solution
A coolant composition comprising glycol, water, azole derivatives, optionally inorganic silicates, tertiary amines, carboxylic acids, and silicophosphonates, which maintains the concentration of inorganic silicates and enhances storage stability while maintaining anti-corrosion efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic silicates are used as corrosion inhibitors in coolants, then anti-corrosion activity against aluminum is improved, but storage stability deteriorates due to formation of polymeric silicates
Solution Approach 1:
Silicophosphonate compounds are introduced as intermediary substances that prevent the polymerization of inorganic silicates. The silicophosphonate acts as a mediator between the silicate molecules, blocking the condensation reactions that lead to polymer formation while allowing the silicate to maintain its monomeric, active form for corrosion protection.
Solution Approach 2:
The invention changes the chemical environment parameters by introducing silicophosphonate compounds with specific molecular structures containing phosphonate groups. This parameter change modifies the chemical equilibrium of silicate species in the coolant, shifting it towards monomeric forms and preventing the transition to polymeric forms during storage.
2Reliability
If inorganic silicates are used to protect aluminum surfaces, then corrosion protection is improved, but the coolant loses effectiveness over time due to silicate polymerization
Solution Approach 1:
The silicophosphonate compound is pre-added to the coolant formulation to preemptively prevent silicate polymerization before it occurs. This preliminary protective action ensures that the inorganic silicates remain in their active monomeric form throughout the storage period and service life of the coolant, maintaining corrosion protection effectiveness.
Solution Approach 2:
Silicophosphonate serves as a protective intermediary that extends the duration of silicate activity. By interfering with the polymerization process, it keeps the silicate in its effective monomeric state, thereby extending the functional lifespan of the corrosion inhibitor in the coolant system.
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 coolant composition maintains effective anti-corrosion activity against aluminum and improves storage stability by preserving the concentration of inorganic silicates, ensuring sustained protection against corrosion.
Implementation Method 1
it is assumed that only monomeric and low oligomeric silicates, such as dimers, are active anticorrosive agents which loose activity on formation of polymeric silicates
Implementation Method 2
In coolants inorganic silicates are widely known as inhibitors against corrosion of aluminium surfaces in cooling systems
Data Source
AI summary
The present application describes coolants with increased activity against corrosion of aluminium and aluminium alloys and improved storage stability, the corresponding coolant concentrates, and the use of such coolants.