Caracterización del grado de adherencia y difusión de la capa de aleación hierro-zinc para perfiles galvanizados de acero estructural de bajo contenido de carbono

Abstract

It was characterized the adhesion and diffusion grade of the Fe-Zn alloy coating obtained by two processes of hot-dip galvanizing, an industrialized process (A company) and an artisan process (B company), which work with different immersion and cooling times. These coatings were applied on structural steel shapes with low carbon content (ASTM A36) and pre-treated mechanically in their surfaces with the next processes: without pre-treatment, polished, sanding and grinding. Then, it was measured the coating adhesion with a Pull-Off test in a universal testing machine through a self-alignment dispositive fabricated based on ISO 4624 standard; additionally, mechanical, metallographic and chemical composition analysis were done to evaluate the galvanizing quality. As results, the products of A company satisfy the acceptance criteria of ASTM A123 standard, while the galvanized of B company presents acceptance problems. Finally, it was determined the relation of the galvanized parameters with the system performance and durability; also, the parameters that should be selected based in technically information.