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

Bárbara Valverde, ROSA DE LAS MERCEDES VERA ARAVENA, Nicole Henríquez, Elizabeth Olave

Research output: Contribution to journalArticlepeer-review

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 Sebastián, 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.

Original languageEnglish
JournalMaterials and Corrosion
DOIs
StateAccepted/In press - 2021
Externally publishedYes

Keywords

  • aluminum
  • atmospheric corrosion
  • electrical transmission towers
  • environmental chloride
  • galvanic couple
  • wire-on-bolt

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