Monoethylene glycol acts as an carrier and auxiliary agent for industrial corrosion inhibitors. It forms protective films on metal surfaces to isolate corrosive substances, achieves over 90% corrosion inhibition rate and fits most industrial anti-corrosion working conditions.
How Does MEG Realize Metal Corrosion Protection?
With abundant hydroxyl groups in molecular structure, mono ethylen glycol (MEG) can firmly adsorb on carbon steel, aluminum alloy and copper surfaces to form dense isolation films, blocking erosion from carbon dioxide, hydrogen sulfide and brine. The formed protective film thickness ranges from 0.5 μm to 1.5 μm effectively reducing corrosion current density. Test data shows 50% MEG aqueous solution cuts carbon steel corrosion rate from 0.3 mm per year to below 0.02 mm per year. In sulfur-containing harsh environment, MEG based inhibitor system controls corrosion rate within 0.01 mm per year. After scientific compounding, its comprehensive corrosion inhibition rate can reach above 92%.
Where Are MEG Blended Corrosion Inhibitors Mainly Used?
MEG matched corrosion inhibitors are widely applied in oil & gas pipelines, industrial circulating cooling systems, equipment antifreeze systems and chemical process pipelines. In oilfield gathering pipelines, MEG with 30% to 60% mixing concentration simultaneously prevents hydrate formation and pipeline corrosion, stabilizing pipeline corrosion rate at 0.012 mm per year. In factory cooling circulation pipelines, 25% to 40% concentration MEG inhibitor protects metal equipment with steady corrosion inhibition rate over 90%. In industrial antifreeze pipelines, qualified MEG formula keeps metal corrosion weight loss lower than 0.1 g per square meter in long-term operation.
What Formula Matching Rules Improve MEG Anti-Corrosion Effect?
The anti-corrosion performance of MEG is greatly affected by mixing concentration, system pH value and auxiliary additives. The optimal usable concentration range is 40% to 60%, too low leads to insufficient protection while over 70% increases fluid viscosity and weakens heat transfer efficiency. Keeping system pH value between 8.0 and 10.0 can strengthen the stability of MEG protective film and weaken acid corrosion damage. Scientific compounding with 1500 ppm filming amine and 1800 ppm oxygen remover can further lower metal corrosion rate to 0.011 mm per year, and adding trace silicate ingredients raises final corrosion inhibition rate above 95%.
What Quality Standards Must Industrial MEG Meet?
For producing qualified corrosion inhibitor products, raw material mono ethylen glycol liquid needs to meet strict industrial-grade specifications. At Tianjin Gnee Biotech Co., Ltd., supplied MEG is typically controlled at purity ≥99.5% to prevent impurity interference in film-forming performance. Water content is maintained below 0.05% to avoid dilution and anti-corrosion failure. APHA color is limited to ≤10, and total acidity (as acetic acid) is kept below 20 ppm, ensuring stable compatibility with corrosion inhibitor systems and minimizing metal surface etching. These specifications are verified through standard quality control testing (GC, Karl Fischer, and ASTM methods) to ensure consistent performance in industrial applications.
