Atmospheric corrosion of carbon steel at marine sites in Saudi Arabia

✍ Scribed by S. Syed

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: German
• Weight: 465 KB
• Volume: 61
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.200905300

✦ Synopsis

Abstract

Atmospheric corrosion tests, according to ASTM G50‐76, have been carried out in Saudi Arabia, at eight marine sites representing different environmental conditions. Environmental factors such as average temperature, average relative humidity, and deposition rates of atmospheric pollutants (Cl^−^ and SO~2~) was investigated. X‐ray diffraction has been used to determine the composition of the corrosion products. Corrosion rates have been determined for each sample at each of the exposure sites via loss of weight. The obtained data were used for the classification of atmospheric aggressivity, according to ISO 9223. The results obeyed well with the empirical kinetics equation of the form C = Kt^n^, where K and C are the corrosion losses in mg/cm^2^ after 1 and t years of the exposure respectively, and n is constant. Based on n values, the corrosion mechanism of carbon steel is predicted. The major constituent of the rust formed in marine environment is goethite (α‐FeOOH). Samples also show the presence of a large proportion of lepidocrocite (γ‐FeOOH) and small amounts of ferrihydrite and maghemite (α‐Fe~2~0~3~).