Corrosion Inhibitors

What is a corrosion inhibitor and how do you choose one?

Corrosion inhibitors are chemicals that reduce the corrosion rate by adsorbing on the metal surface or forming a protective film. Water-soluble inhibitors are used in cooling and process water; oil-soluble inhibitors in oils, fuels and protective coatings; vapour-phase (VCI) inhibitors in closed packaging and storage; acid inhibitors protect the base metal during acid cleaning; pipeline inhibitors control CO₂/H₂S corrosion in oil and gas systems.

Selection depends on the medium (water, oil, acid, gas), temperature, flow regime, metal type and the required protection period.

Selection criteria

• Medium and phase: aqueous system, hydrocarbon, vapour phase, acidic solution
• Metal type and galvanic effects in multi-metal systems
• Temperature, pressure, flow velocity and water cut
• Application: continuous injection, batch, dipping, in-package
• Regulatory and compatibility needs: nitrite/chromate-free, food contact, marine discharge

Use and dosage

Typical dosages: aqueous system inhibitors 10–50 ppm continuous; pipeline inhibitors 20–100 ppm continuous or batch; acid inhibitor 0.1–0.5% in the acid solution; VCI products according to the protected volume (e.g. 1 g per litre of package volume, or as film/paper); oil-soluble protectives 1–5% in oil. Effectiveness is monitored with coupons, electrochemical probes and iron counts, and the dose is updated according to field results.

The ranges given are typical values; the exact dosage is determined by the product’s Technical Data Sheet (TDS) and a trial in your own process.

Packaging, storage and shelf life

Supplied in 25–30 kg cans, 200 kg drums and IBCs. Store between +5 °C and +35 °C in closed packaging; shelf life 12–24 months depending on the product.

Why Biyopol?

Biyopol Kimya is an industrial chemicals manufacturer producing in İzmir, Türkiye since 1992. It offers own-brand products and contract manufacturing in nine product groups, provides a TDS/SDS for every product, runs trials in its laboratory and at the customer’s site, and supplies in cans, drums and IBCs.