Study of the electrochemical behaviour of 304 stainless steel in postgate medium in the presence and absence of desulfovibrio desulfuricans

2008

Three-year exposure programme was carried out in Saudi Arabia at nine test stations with different climatic and pollution conditions. The aim of this study was to evaluate the joint effect of atmospheric pollutants (Cl À and SO 2 ), relative humidity (RH) and temperature (T) on the atmospheric corrosion of galvanized steel (GS) and aluminium (Al). Corrosion rates of the two metals have been obtained by loss of weight after 1, 2 and 3 years exposure. The composition of the corrosion products formed on the specimens was identified by X-ray diffraction analysis. A classification of the atmospheric corrosion aggressivity of the test sites based both on environmental data and corrosion rate measurements was made according to ISO 9223. In some regions, it can be found that corrosion rate values exceed those established by the ISO standard.

Section: Chloride Concentrationmentioning

confidence: 77%

Atmospheric corrosion of galvanized steel and aluminium in marine and marine‐industrial environments of Saudi Arabia

Almarshad

2008

“…Both K and n are dependent on the type of metal and climatic parameters. The validity of the equation and its reliability to predict long‐term corrosion has been demonstrated by many authors 15–28.…”

Section: Experimental Methodsmentioning

confidence: 92%

The effect of atmospheric pollution on materials damage

2012

According to ASTM G50‐76, materials have been exposed to atmospheres of Saudi Arabia. Environmental factors such as temperature, relative humidity and deposition rates of pollutants (Cl− and SO2) were investigated. X‐ray diffraction was used for characterization. Corrosion rates were determined by weight loss. As per ISO 9223, aggressivity classification was made. The results obeyed well with the empirical kinetics equation of the form C = Ktn, where K and C are the corrosion losses in mg/cm2 after 1 and t years of the exposure, respectively, and n is constant. Based on n values, the corrosion mechanisms of samples are predicted.

“…Both K and n are dependent on the type of metal and climatic parameters. The validity of the equation and its reliability to predict long-term corrosion has been demonstrated by many authors [17][18][19][20][21][22][23][24][25].…”

Section: Discussionmentioning

confidence: 99%

Atmospheric corrosion of carbon steel at marine sites in Saudi Arabia

2010

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 À 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 ¼ 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 (a-FeOOH). Samples also show the presence of a large proportion of lepidocrocite (g-FeOOH) and small amounts of ferrihydrite and maghemite (a-Fe 2 0 3 ).