Anti-Corrosion Protection of Metal Structures
350–800 UAH/m²
Unprotected metal at an industrial facility is not a question of 'whether it will corrode' but 'when'. The aggressive environment of chemical plants, marine climate, or ordinary condensation moisture reduces the service life of an unprotected structure to 5–7 years. Emergency repair costs 3–5 times more than planned protection.
Anti-corrosion protection by TEHMAS is built on a systems approach: coating system selection per ISO 12944 (categories C3/C4/C5-I/C5-M/CX), proper surface preparation, and layer-by-layer application of primer and finish coat with DFT control at every stage. We do not sell 'paint' — we sell protection for 15, 20 or 25 years with a calculated service life.
TEHMAS is an authorized applicator of Jotun, Hempel and Sigma Coatings systems. This means the coating manufacturer issues its own material warranty, and we issue a workmanship warranty — together you receive double protection of your investment.
Anti-Corrosion Protection of Metal Structures
Anti-Corrosion Protection Process
Corrosivity Category Assessment
A process engineer analyses the service conditions of the facility: environment (C3 — urban industrial, C4 — chemical, C5-M — marine), temperature, contact with aggressive substances. Based on this, a coating system is selected per ISO 12944-2.
Surface Preparation
Sandblasting to Sa 2.5 or Sa 3, roughness Rz 50–75 µm. Degreasing with solvent. Moisture control — dew point +3°C minimum. Without proper preparation, no anti-corrosion system will achieve its design service life.
Primer Application
Epoxy zinc-rich primer (Zn content ≥ 85% in dry film) or epoxy primer with lamellar pigment. Primer DFT — 60–80 µm. Application by airless spray (Graco) or brush/roller in hard-to-reach areas.
Intermediate and Finish Coats
Epoxy or polyurethane intermediate coat DFT 80–120 µm. Final polyurethane or acrylic-polyurethane topcoat DFT 50–80 µm — UV resistance, chemical resistance, mechanical wear resistance. Total system NDFT — 200–280 µm.
Measurement and Handover
DFT measurement of each layer with Elcometer 456 magnetic gauge — minimum 5 readings per 10 m². Cross-cut or pull-off adhesion test. As-built documentation: concealed work reports, material data sheets, DFT map. Warranty certificate.
Applicable Facilities
Chemical and Petrochemical Plants
Tanks, reactors, pipelines in environments of acids, alkalis, petroleum products. C5-I or Im1/Im2 category systems with 15+ year service life.
Bridges and Transport Infrastructure
Bridge spans, supports, connection nodes. Systems with galvanizing + duplex coating for 25+ year service life. Work without traffic closure.
Industrial Buildings and Warehouses
Load-bearing structures, roof trusses, wall panels. Corrosion protection under conditions of constant condensation and temperature cycling.
Port and Marine Infrastructure
Quays, cranes, metal structures in the splash zone. Im2/Im3 and C5-M category systems resistant to salt water and biofouling.
Technical Specifications
Pre-Order Questions
Can a coating peel off a year after application?
It can — if surface preparation is compromised or the recoat window between layers is not observed. This is exactly why we control the cleaning grade, DFT of every layer, and application conditions (temperature, humidity). If delamination occurs due to our fault — we redo it at our own expense.
What is the difference between ISO 12944 C4 and C5?
C4 — high corrosivity: industrial zones with chemical pollution. C5-I — very high: aggressive industrial environments. C5-M — marine zone. The category choice affects system thickness and composition — and price. Selecting the wrong category = premature corrosion.
Can coating be applied over existing paintwork?
It depends on the condition of the existing coating and its compatibility with the new material. First — adhesion test and DFT measurement. If residual adhesion ≥ 3 MPa and the coating is not delaminating — overcoating is possible. If not — full removal and a new cycle.
How long before the structure can be loaded after application?
Touch-dry — 2–4 hours. Mechanical resistance — 24–48 hours. Full cure of epoxy systems — 7 days at +20°C. Exact data are in the product data sheet of the specific material, which we provide together with the acceptance reports.
What is the difference between galvanizing and zinc-rich primer?
Hot-dip galvanizing — metallic Zn applied in a bath, cathodic protection, service life 20–40 years. Zinc-rich primer — 85% Zn in paint, also cathodic protection, but applied on-site without dismantling, service life 10–15 years. For reconstruction and repair — the optimal solution.
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