1. Introduction to GLMAG Technology
GLMAG is a pioneering coating technology developed by Poshaco Group and is exclusively applied in the production of color-coated steel products to enhance corrosion resistance compared to older generations of alloy-coated steel.
With the unique combination of three key components: Aluminum (Al), Zinc (Zn), and Magnesium (Mg), GLMAG becomes the perfect solution for alloy-coated steel products that require high durability and long lifespan, especially in harsh environmental conditions.
2. Outstanding Advantages of GLMAG Technology
- GLMAG coating technology with a three-component Mg-Al-Zn structure featuring tightly bonded microstructure.
- Hard surface with superior corrosion resistance, 5-7 times better than galvanized coating.
- Ability to self-seal alloy into cuts and drilled or screw holes quickly.
- Excellent paint adhesion, creating a strong bond between the coating and the paint layer.
- Complies with Japanese standard JIS G 3323.
3. Corrosion Protection Mechanism of GLMAG Technology
In highly corrosive environments, such as coastal areas and heavy industry sectors, GLMAG coating technology provides products with a longer lifespan compared to conventional products.
Conventional galvanized products, after coating, form a Zn(OH)₂ layer. This coating layer is large, porous, and unstable, leading to faster corrosion.
GLMAG coating incorporates Magnesium (Mg) and Aluminum (Al) molecules with high flexibility, interspersed with Zinc molecules, creating a tightly bound and denser alloy structure compared to conventional galvanized products.
Under the influence of Aluminum and Magnesium, GLMAG forms a zinc hydroxide corrosion-resistant coating (Simonkolleite - Zn₅(OH)₈Cl₂·H₂O) directly on the alloy surface, preventing water and oxygen from penetrating, thus enhancing the corrosion resistance of steel.
4. Self-Healing Mechanism of GLMAG Technology
Alloy-coated steel used in construction materials and heavy equipment often suffers from impacts, scratches, and drill or screw holes, increasing the risk of corrosion.
- Initial Phase: Formation of the Simonkolleite layer
When the coating is scratched or drilled, exposing the underlying steel, the Magnesium compound in GLMAG technology activates Aluminum and Zinc molecules to form metal oxide, creating a thin protective film on the exposed steel surface. This helps slow the oxidation process in the scratched area.
- Protection Phase: Active alloy self-heals the scratched area
Zinc in the coating activates the sacrificial protection mechanism to safeguard the underlying steel layer. Magnesium promotes the process of alloy filling into exposed steel, minimizing corrosion spread.
- Recovery Phase: GLMAG Alloy Coating
The alloy structure is maximally regenerated in scratched areas, drill holes, cut edges, and screw holes. Aluminum and Magnesium continue to form and complete the protective film on the surface of cuts and scratched areas.
