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Factores operacionales que afectan el comportamiento del acero galvanizado por inmersión en caliente Operational factors affecting the hot dip galvanizing steel

Authors: Miguel Sánchez; Ramón Contreras; Orlando Pérez; Oladis de Rincón; William Campos;

Factores operacionales que afectan el comportamiento del acero galvanizado por inmersión en caliente Operational factors affecting the hot dip galvanizing steel

Abstract

En este trabajo se presentan los resultados de la evaluación de probetas de acero galvanizado por inmersión en caliente con tiempo de baño de 1, 2 y 3 minutos. Se realizaron ensayos de espesor de recubrimiento y mediante técnicas electroquímicas se midió la velocidad de corrosión del acero en soluciones de baños ácidos a 5; 10 y 16% de HCl y agua de enjuage pH 2,50; 3,50 y 4,50; y del acero galvanizado en una solución de NaCl 3,5%. Se analizaron ciertos parámetros operacionales, tales como el envejecimiento del baño ácido (HCl), y eliminación de la etapa de enjuague, para observar su influencia en el recubrimiento de cinc. Se encontró que a medida que aumenta el espesor del recubrimiento disminuye la velocidad de corrosión. Mediante el uso del microscopio electrónico de barrido se determinó que cuando se obvia el enjuague, el cloro puede quedar atrapado entre dos capas (interfase), y luego migra de la capa superior (Delta) hacia la inferior (Gamma).An evaluation by hot dip galvanizing on steel after a 1; 2 and 3-minutes immersion was studied. These samples were carried out for evaluating microhardness and thickness measurements. Electrochemical techniques were used to determined the corrosion rate of steel in acid pickling 5; 10 and 16% HCl; rinsed with water of pH 2.50; 3.50 and 4.50 and hot dip galvanized steel in 3.5% NaCl. Certain operational parameters were analyzed, such as the aging bath (HCl), and elimination of the rinsing stage, to observe their influence in the hot dip galvanizing coating. It was found that an increase of coating thickness of hot dip galvanizing steel decreased the corrosion rate and the microhardness. Surfaces of alloy layer of the coating were examined by scanning electron microscope (SEM). SEM measurements was determined that when obvious the rinsing, the chlorine can be catched between two layers (interface), and soon migrates of the outermost alloy layer of the coating (Delta) towards the innermost one (Gamma).

Keywords

Hot dip, corrosion, cinc, corrosión, enjuague, zinc, pickling, Engineering (General). Civil engineering (General), Galvanizado, decapado, rinsing, T1-995, TA1-2040, Technology (General)

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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