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Corrosion inhibitors and heat transfer fluids
Corrosion inhibitors are substances and mixtures that inhibit the oxidation or otherwise rusting or melting of metals. This process is particularly relevant in the case of intermetallic systems, e.g. in heating-cooling processes in apartments, cars and industry. The decomposition of metals can be stopped by several different mechanisms: Oxygen binding (antioxidants), whereby the absence of oxygen in the system leads to the dissolution of metals, pH maintenance (buffers), whereby the pH of the system is maintained between 7 and 10, thus creating a non-aggressive environment for the metals and making the metal parts more stable, micro-film formers (insulators), where the systems form a nano-film that prevents water and oxygen from reaching the surface of the metals, thus completely limiting the transition of the metals from solid to soluble state.
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Corrosion inhibitors are needed in aggressive environmental conditions: salty, acidic environments, different metals in one system, aqueous solutions of different components.
The choice of corrosion inhibitor depends on the number of components required, the durability, and the approvals and certificates required.
The most popular corrosion inhibitors are G12+, BS6580, monoethanolamine, diethanolamine, lithium hydroxide.