Evaluation of Steel Corrosion Products in Tropical Climates

Characterization of Corrosion Products on Carbon Steel Exposed to Natural Weathering and to Accelerated Corrosion Tests

“…Despite these fitting problems, for some samples the hyperfine parameters (isomer shift, quadrupole splitting, and magnetic hyperfine field) of goethite were in agreement with other works [12][13][14] and therefore its presence might be presumed. However, magnetite could not be identified in any of the specimens exposed to atmospheric corrosion.…”

“…the Mössbauer spectra. The sextets of goethite and magnetite did not fit other results reported in the literature [12][13][14].…”

“…Some works in the literature [7][8][9][10][11][12][13][14] give valuable data related to the composition and morphology found in corrosion products of carbon steel specimens exposed to atmospheric conditions. Almeida et al [15] reported that the initial stages of atmospheric corrosion of carbon steel in both rural and urban atmospheres yield the formation of lepidocrocite 2 International Journal of Corrosion ( -FeOOH) and goethite ( -FeOOH).…”

Characterization of initial atmospheric corrosion of conventional weathering steels and a mild steel in a tropical atmosphere

“…This is due to the high chloride contamination that was built in the inner parts of the plates where salt got occluded. Akaganeite as a corrosion product is typical of coastal areas [2,[17][18][19] that have high concentrations of chlorides due to marine aerosols. It is presumed that akaganeite is formed instead of the goethite and its presence can be connected with the formation of Fe 3 O 4 in the rust [20], resulting in high rate of corrosion.…”

“…Numerous studies [1][2][3][4][5][6][7][8] on atmospheric corrosion of mild and weathering steels have been carried out to determine the composition, structure or various properties of the iron rusts, but only a few have been devoted to the determination of the phase composition and other characteristics of the corrosion products of steel exposed to the tropical climate of Panama [9][10][11][12]. This paper presents the characterization of the early oxide layer formed on conventional weathering steels and a mild steel in tropical atmospheres, part of a more general study aiming at furnishing systematic data on the performance of weathering steels in Panama.…”