Evaluation of atmospheric galvanic aluminum corrosion in electrical transmission towers at different sites in the Valparaiso region, Chile. Wire-on-Bolt Test (CLIMAT)

Valverde, Barbara; VERA-ARAVENA, ROSA DE LAS MERCEDES; Henriquez, Nicole; Olave, Elizabeth

Abstract

This study evaluates environmental aggressiveness and atmospheric galvanic corrosivity categories in Chile (Classification of Industrial and Marine ATmospheres test) by installing bolts in electrical transmission towers in the Valparaiso region across four exposure sites: Playa Ancha, San Sebastian, Las Vegas, and San Felipe. Classifications of marine corrosion index (MCI), industrial corrosion index (ICI), and atmospheric corrosion index (ACI) used different galvanic couples: aluminum/steel for MCI, aluminum/copper for ICI, and aluminum/polyethylene for ACI. Corrosion indices varied by season (summer, autumn, winter, and spring), for which couples were exchanged every 3 months. Intraseason variation depended mainly on the meteorochemical variables of the zone, the Cl-/SO2 ratio, and the presence of general and pitting corrosion in the aluminum. The results indicate that, regardless of environmental condition, the aluminum in Al/steel (MCI) and Al/copper (ICI) couples presented a higher corrosion rate than when not forming a galvanic couple (ACI). Moreover, under higher environmental chloride, these differences increase. The Playa Ancha station presented the highest ACI.

Más información

Título según WOS: Evaluation of atmospheric galvanic aluminum corrosion in electrical transmission towers at different sites in the Valparaiso region, Chile. Wire-on-Bolt Test (CLIMAT)
Título según SCOPUS: ID SCOPUS_ID:85105484229 Not found in local SCOPUS DB
Título de la Revista: MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Volumen: 72
Fecha de publicación: 2021
Página de inicio: 1607
Página final: 1619
DOI:

10.1002/MACO.202112419

Notas: ISI, SCOPUS