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GLMAG TECHNOLOGY

GLMAG is a triple-alloy coating technology (Aluminium – Zinc – Magnesium), developed and exclusively applied by Poshaco Group to its pre-painted alloy-coated steel products. This innovation significantly enhances corrosion resistance compared to older-generation coated steel products.

01 A world-class coating technology
02 Contains Magnesium – a strong, durable, and adaptable metal element
03 Offers superior corrosion resistance, far beyond conventional alloy coatings
04 Outstanding edge and screw hole protection, even at cut areas
05 Excellent paint-to-coating adhesion, ensuring long-term durability and surface integrity

PROTECTION MECHANISM OF GLMAG

Corrosion resistance mechanism

GLMAG technology offers exceptional corrosion resistance through the synergy of Aluminium (Al), Zinc (Zn), and Magnesium (Mg). The GLMAG coating forms a stronger and more durable bond than conventional galvanized coatings, providing effective steel protection even in coastal or heavy industrial environments.

Self-healing mechanism

GLMAG features a self-healing mechanism that protects the steel substrate even when scratched, drilled, or impacted. Thanks to the combination of Aluminium, Zinc, and Magnesium, the coating acts as an active barrier that seals the damaged area, restores protection, prevents corrosion from spreading, and ensures long-lasting durability.

LEADING ADVANTAGES OF GLMAG COATING TECHNOLOGY

GLMAG 01
Durable microstructure of Mg–Al–Zn Alloy

Forms a tightly bonded alloy layer that enhances hardness and coating stability.

GLMAG 02
Superior rust resistance — 5 to 7 Times Better Than Galvanized Coating

Dual protection mechanism: prevents corrosion and actively self-heals damaged areas.

GLMAG 03
Maximum scratch resistance

Thick and stable coating minimizes mechanical scratches, keeping the surface intact.

GLMAG 04
Outstanding paint adhesion

Provides a strong foundation for color coatings, ensuring long-lasting aesthetics and durability.

TECHNOLOGY VALIDATION

Enhanced surface corrosion resistance

GLMAG-coated steel delivers outstanding corrosion resistance on flat surfaces, reducing the penetration of rust-causing agents by 5–7 times compared to conventional galvanized (GI) coatings.

Salt spray test (JIS Z2371 standard) — conducted at 35°C with continuous spraying of 5% NaCl solution for 2,000 hours — has proven that GLMAG significantly outperforms GI in corrosion resistance.

Superior corrosion resistance at cut edges, drilled holes, or bent areas

Self-healing mechanism – alloy sealing at cut edges and drilled holes – increases corrosion resistance up to 10 times compared to GI-coated steel. The product has high ductility, does not crack during forming, retains the coating firmly, and minimizes rust.

Comparison of corrosion resistance at cut edges between GLMAG and GI-coated steel.

Rust occurrence at cut edges after salt spray test.

(Coating thickness: 3.2 mm, coating weight: 120g/m²)

Excellent paint adhesion

GLMAG has excellent adhesion between the metallic coating and the paint layer, providing superior performance when used as a material for PCM color-coated steel sheets in both interior and exterior construction. GLMAG enhances paint adhesion, facilitates the coating process, and improves product aesthetics.

Comparison of corrosion resistance after color coating between GLMAG-coated and GI-coated steel.

Test conditions:
– SST: JIS Z2371 (neutral salt spray test) 35°C, continuous spray with 5% NaCl
– Tested material: untreated substrate for each type of steel sheet
– Pre-treatment: zinc phosphate (PALBOND 138)
– Paint: Acrylic Super Lac F-50, coating thickness: 30µm

Coating weight: 90g/m²