Effect of height on the corrosion of steel and galvanized steel in nontropical coastal marine environments

ROSA DE LAS MERCEDES VERA ARAVENA, Oladis T. de Rincón, Jesús Ramirez, Bárbara Valverde, Andrés Díaz-Gómez, Rodrigo Sánchez-González

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

In this study, the behavior of carbon steel and galvanized steel in nontropical coastal marine environments was evaluated. Evaluation was carried out with specimens with dimensions of 10 cm × 10 cm × 0.3 cm. These specimens were exposed to four testing stations (Iquique, Mejillones, Los Vilos, and San Vicente), where racks were installed both at ground level (ground), as well as in the upper zone of electrical transmission towers (tower). In each station, 24 specimens of A36 carbon steel and galvanized steel were placed (12 each). The corrosivity of the environment was measured using the ISO 9223, 9225, and 9226 standards. The specimens were evaluated on-site, monthly, through visual inspection and photographic record. Once withdrawn, the corrosion rate was determined and the corrosion products were analyzed through Raman and Fourier-transform infrared. The results show that, in all cases, the corrosion rate is greater in the tower than on the ground. However, even though the Los Vilos station is located farther from the sea (3,500 vs. ≈500 m), the corrosion rate of steel in the tower is the highest. This is caused by the generation of HCl from the transformation of lepidocrocite into goethite, in the presence of low chloride content, which acidifies the steel/corrosion product interface. In the case of galvanized steel, the corrosion rate is a function of the chloride content in the atmosphere, obtaining an excellent correlation between both parameters.

Original languageEnglish
Pages (from-to)1125-1137
Number of pages13
JournalMaterials and Corrosion
Volume71
Issue number7
DOIs
StatePublished - 1 Jul 2020
Externally publishedYes

Keywords

  • corrosion
  • galvanized steel
  • height
  • nontropical marine environment
  • steel

Fingerprint

Dive into the research topics of 'Effect of height on the corrosion of steel and galvanized steel in nontropical coastal marine environments'. Together they form a unique fingerprint.

Cite this